Advanced BCS troubleshooting.. Tuners chime in!!

[spoolin]

Hey there guys, today i installed the 3 port GM boost sensor on my car and started tuning it through ecuflash. After a few hours i was able to get somehwhat of a decent "MAX WASTEGATE DUTY #" map. It was very hard at first to control the high boost spikes, (still is sometimes in 2nd gear pulls) but overall i was able to even it out as best as i could. However, in the 4000-5500 range, boost is very incosistant despite my desperate efforts with the wastegate duty maps. It just doesnt seem to want to hold steady until 6000-redline. I tried playing with the "BOOST DESIRED ENGINE LOAD" maps as well but i am still a little lost as to how these correspond or work together with the wastegate duty maps to get consistant boost. Also how could i useÂ* "boost control load offest" and "error correction" to further my consistancy in the midrange??? Keep in mind im still trying to figure out/learn this new way of Boost control so any input will be appreciated! I'll post my current wastegate duty cycle map, and desired engine load map.....
Boost spikes at 1.6 Bar, tapers around in the mid range, holds steady 1.35-1.4 bar from 6000-redline as is.......

WASTEGATE DUTYÂ* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* BOOST DESIRED ENGINE LOAD
RpmÂ* Â* %Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* RPMÂ* Â* Â* Â* Â* Â* Â* Â* Â* Â*%
500Â* Â* Â* 100Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â*Â*500Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â*159.4Â*
1000Â* Â* 100Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* 1000Â* Â* Â* Â* Â* Â* Â* Â* Â* Â*159.4
1500Â* Â* 100Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* 1500Â* Â* Â* Â* Â* Â* Â* Â* Â* Â*159.4
2000Â* Â* 100Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* 2000Â* Â* Â* Â* Â* Â* Â* Â* Â* Â*159.4
2250Â* Â* 100Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* 2500Â* Â* Â* Â* Â* Â* Â* Â* Â* Â*159.4
2500Â* Â* 100Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* 2750Â* Â* Â* Â* Â* Â* Â* Â* Â* Â*155.6
2750Â* Â* 100Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* 3000Â* Â* Â* Â* Â* Â* Â* Â* Â* Â*153.1
3000Â* Â* Â*60Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â*3500Â* Â* Â* Â* Â* Â* Â* Â* Â* Â*150.6
3500Â* Â* Â*55..... (boost spike control) :(Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â*4000Â* Â* Â* Â* Â* Â* Â* Â* Â* Â*150.0
4000Â* Â* Â*69Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* 4500Â* Â* Â* Â* Â* Â* Â* Â* Â* Â*153.8
4500Â* Â* Â*75Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â*Â* 5000Â* Â* Â* Â* Â* Â* Â* Â* Â* Â*153.8
5000Â* Â* Â*74Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â*5500Â* Â* Â* Â* Â* Â* Â* Â* Â* Â*153.8
5500Â* Â* Â*70.5Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* 6000Â* Â* Â* Â* Â* Â* Â* Â* Â* Â*145.6
6000Â* Â* Â*68.5Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â*Â*6500Â* Â* Â* Â* Â* Â* Â* Â* Â* Â*139.4
6500Â* Â* Â*68Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* 7000Â* Â* Â* Â* Â* Â* Â* Â* Â* Â*129.4
7000Â* Â* Â*68
** edited so graphs would match up!



Â*

[XVeloX]

F*&K! i had a huge page typed out and my finger hit the back button and erased everything :x :x :x Here's what i can remember i had typed out:

1) The biggest issue was consistancy, especially when the pulls started after ~3500 RPM's. The car would boost too high.
2)His car only responded to changes made the WGDC and BDEL maps #1? Unless it was using map 1 at first and then switching to map 2 where we had a lower boost set. (causing a huge spike at first, and then instantly dropping down to 1.1 bar and eventually climbing back to where we wanted it. I thought the car was supposed to use map #2? and 1 was for cold start? There are 4 total...)
3)He talked to a guy at radioshack and they said they don't make 10ohm 1W resistors cause there is too much heat buildup, only 10ohm 10W resistors...but this puppy is huge!!!!! we'll get pics tomorrow... would this still work with the higher wattage value? (i thought it was unrelated to what we are dealing with)
4)We didnt play around a whole lot with TBEC, not sure how that table affects things...
5)One mistake we made was (at first) we tried to tune the car to have a spike to ~23 psi and then taper quickly to 21 until it got close to redline (hfc) to around 19.5 or so right at 6250-6500. This type of boost control didn't seem to like that.
5.5 (related to above) - Instead of using BDEL to show what kind of loads we were looking for, we more or less left it alone, set BCLO to 80, and mostly played with the WGDC's to get the boost where we wanted it, but i have a feeling if we set the BDEL to what we want the load to look like and then use the WGDCs to fine tune the boost we will have better luck. I also tried playing with the WG activation (reactivation and deactivation) settings, stock set at:
2000
1906.25
3250
7187.5

and tried changing the third value the same as the forth in hopes to turn off "deactivation" thinking that maybe that was related to when the pulls started later and we got higher boost (~1.9 bar) but it was no help. Btw the car is very rich right now so we don't damage anything when it boosts too high...

So any help regarding the consistancy and smoothing would be great. There were some pulls where after a little spike it would hold 1.4 bar to 6500 and taper to ~1.35 by redline just like we wanted, and others it would drop to almost 1.1 bar by redline and spike way too high. TIA for the insight :)

[XVeloX]

P.S. if i'm not mistaken i thought we used the following values for the RPM's and not the ones listed in the first post:
1000
1500
2000
2500
3000
3250
3500
3750
4000
4250
4500
5000
5500
6000
6500
7000

[XVeloX]

one thing i found from reading, sound correct? it's an old post, but is what my thoughts were:


O.K. sounds like you are on teh right track.

A few tips on tuning the boost setup. Take look at your logs from a run where the boost was cosistant. Now, map out the calculated load vs rpm as an example:
3000 220
3250 240
3500 255
3750 260
.
.
.
6500 220
6750 215
7000 210

now, you want to setup your boost desired load AND boost control load offset so that the additive product of the two equals your target load. For example

Boost control load offset = 140
boost desired load table:
3000 120 (target load = 120+140 or 260)
3500 120
4000 110 (target load = 110+140 or 250)
.
.
6500 70 (target load = 70+140 or 210)
7000 60 (target load = 60+140 or 200)

Next set your max wastegate duty cycle to something flat like 100 across the board and go do some logging. you can adjust the max wastegatge duty cyce up and down till you find the sweet spot where you are getting very close to the target load values, assuming you are being realistic about the target load values and not trying to hit 240 load at 7,000 rpm.

I think the problem you are having is due to not having the maps setup correctly and the error correction is kicking in on overboost and pulling the boost down, overcorrecting, then letting it run back up.

Also, If you are not able to run 21psi at redline, don't worry about it, let it tapper as much as you need to be consitent, then add a little more timing or run it a little leaner.

Hope that helps get you going.

sounds like we are just "overboosting" and "underboosting" so it's trying to help correct. We just need to dial in the BDEL better. What kind of peak load should we be looking at by running a 23 psi peak and tapering to around 19-20 at redline? I'm going to venture a guess at around 280, down to about 220-230. We'll give it a try in the morning...

[earlyapex aka jack ass]

Here is a tip.

Zero out TBEC and get your WGDC set pretty close to how you want your boost in 3rd gear. Once you have the boost curve set how you want it in 3rd, check your load over rpm in 3rd via logs. *don't do pulls in 4th+ or you will overboost with TBEC turned off.

Turn back on TBEC. At first it will probably spike or underboost depending on how you have BDEL and BCLO because now you are having boost compensation adding/subtracting boost depending on if you are overshooting or undershooting target loads. Set BDEL and BCLO to closely match your loads via your logs. So let's say you are hitting 255 load at 4000 rpm, you could set your BDEL at 155 and your BCLO at 100 = 255. You will have to push and pull your BDEL and BCLO so your boost curve is smooth again.

It takes awhile to get the hang of it, sometimes the BDEL and BCLO are a little different than you would think they are.

Now you know why I had a point in time where I was flashing my ECU 20+ times a day. :)

Now I have it pretty much down where I don't have to zero out the TBEC table to tune the boost curve.

Depending on the year of the car, set all MWDC and BDEL maps the same for now until you get the hang of tuning boost.

[turbotiger]

As bryan said, once you have the MWGDC set to your desired boost curve with the TBEC zero'd out, you can tweak with the TBEC and BDEL. To help tweak with the BDEL to the correct load, you should log the WGDC. Go ahead and add the WGDC entry in post #1 in either evoscan or mitsulogger.
http://forums.evolutionm.net/showthread.php?t=259494

You can then compare against your MWGDC maps to see how much it adjusted the WGDC, reference the TBEC then adjust the load in BDEL accordingly. All your boost runs should be done in 3rd gear.

If you need to explain it in english, let me know.

I'm also readjusting my boost curve, unfortunately I only have enough time to do a few runs a day, so I'm at the point where I just enabled the TBEC and am adjusting the BDEL.

[spoolin]

Ok UPDATE! Lots of improvments today! 35+ logs to go with it! WHew. Unfortunatley, we didnt see your posts until after we were done tuning, so we figured it out for ourselves. Like u mentioned, we started out by zero-ing out the TBEC and proceeded to tune the WGDC and BDEL maps. We finally were able to play with the BDEL enough to get correct load (for third gear pulls) and adjusted the WGDC accordingly. VIOLA!! 22 psi peak with CONSISTANT midrange and top end. So then i decide to start doing fourth gear pulls. What i noticed was that if i started the pull at 3000, the wastegate would not open up fast enough and it would spike WAY too high. If i started it at 3500, it would spool perfect. Then i remembered' DOH!! I left the TBEC off. So i turned that back on, and it fixed the problem for the most part. (Still a little sketchy in 5th gear and occasionally 4th at low rpm pulls.)

All i can say is wow! this made tuning soooo much easier. My afrs are more conistant and my boost is a flat line. I tuned as much as i could today but realized i messed up. I left the boost tapering to 1.4 bar without really realizing it. Keep in mind this is an 03 with a 9.8 hotside and a HFC! Yikes! IM AN IDIOT! i kept wondering why i'd get ZERO knock until 6000, where i'd get 5 counts and a nasty timing drop. Without thinking, i ended up just dropping the timing up top to 13 degrees :(. Im knockless now, but i'd rather run a bit more timing up top so tomorrow im gonna play with the WGDC a bit and see if i can get a steeper taper at the end.

THANK YOU all for the input and help! Keep it coming!

[earlyapex aka jack ass]

What i noticed was that if i started the pull at 3000, the wastegate would not open up fast enough and it would spike WAY too high. If i started it at 3500, it would spool perfect. Then i remembered' DOH!! I left the TBEC off. So i turned that back on, and it fixed the problem for the most part. (Still a little sketchy in 5th gear and occasionally 4th at low rpm pulls.)


Try reducing WGDC and BDEL before 3000 rpm.

[spoolin]

ok! i will try it. I was just hesitant at first to do this cuz i didnt wanna compromise the quicker spool time.. Safety comes first however.. I will let you know...

[spoolin]

Actually hold on a sec..... I forgot that i DID try this.. I'll post my graphs and tell me if you think is should do it earlier in your honest opinion...

RPMÂ* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* %
1000Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* 100
1500Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â*100
2000Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â*100
2500Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â*98.5
3000Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â*95
3250Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â*89
3500Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â*85
3750Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â*64.5
4000Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â*63
4250Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â*60.5
4500Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â*59.5
5000Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â*57
5500Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â*59
6000Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â*60
6500Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â*62.5
7000Â* Â* Â* Â* Â* Â* Â* Â* Â* Â* Â*67

Any thoughts?? Is 98.5 at 2500 just not enough????

[earlyapex aka jack ass]

That's alot of WGDC from 3000 - 3500

Try 90 at 2500, 85 at 3000, 70 at 3250 and 65 or so at 3500.

You said it doesn't spike if you go WOT at 3500, that's because at 3750 you drop your WGDC down 20%.

[spoolin]

ah, good point. Ok i'll give it a shot/post logs within the next couple days. Also just a pointer for tomorrow, where would you say boost should be (psi or bar value) at 6000-7000 rpms? Just a ballpark estimate of where you think a safe taper would be... This is a 272 cammed 9.8 hotside with a HFC. I just dont want the turbo getting too heat soaked (as it is now).... and i know i've already had to drop timing enough as is due to limitations of running a hfc.....but i dont want to lower boost too much at 6000 and have a significant power drop......... :?

[earlyapex aka jack ass]

What is it now at 6000+? 19-20 should be ok depending on the car.

Dropping timing is ok if it's holding boost more.

[spoolin]

According to my defi, (ya i know... :() which reads +1 psi high, im at 1.4 bar at redline.... In reality its probably closer to 19, or 19.5 psi. I didnt know my car could hold boost so! I dont mind running the lower timing since my egt's are still in check.... 850-870 degrees celcius tops.... I just know 13 degrees up top is a little low. I guess its whatever the car likes...

[XVeloX]

That's alot of WGDC from 3000 - 3500

Try 90 at 2500, 85 at 3000, 70 at 3250 and 65 or so at 3500.

You said it doesn't spike if you go WOT at 3500, that's because at 3750 you drop your WGDC down 20%.


that was the next step, we just couldn't bring outselves to have spool kick in any slower :) full spool by ~3400 RPMs kicked ass :shock: O well, the huge spikes are no good and we'll take care of them. I didn't drive it, but from the passanger seat with the car untuned for fuel (very rich for safety) and low timing (same thing...knock deterent) the thing was fast all the way to redline. A few times he went past redline in 3rd cause it came up so freakin fast!

Bryan, any chance we could swing by GST on sat to take a look at what we've done? I know mike said you guys are booked this week, but since spoolin and i are back in san diego by sunday, we wanted to make sure nothing is fugged up

[earlyapex aka jack ass]

Bryan, any chance we could swing by GST on sat to take a look at what we've done? I know mike said you guys are booked this week, but since spoolin and i are back in san diego by sunday, we wanted to make sure nothing is fugged up


Sure. I am on the dyno all day but I should be taking a little break at some point anyway. ;)

[XVeloX]

Bryan, any chance we could swing by GST on sat to take a look at what we've done? I know mike said you guys are booked this week, but since spoolin and i are back in san diego by sunday, we wanted to make sure nothing is fugged up


Sure. I am on the dyno all day but I should be taking a little break at some point anyway. ;)


ya that's what mike said, figured i could at least come by and say hey.

[vroomevo]

Hello.Â*
I am playing with boost solenoid.

I get peak boost of 1.6bar, then tapers/holds 1.4 till redline.

how can i get rid of boost spike?
here is my settings.

btw, my evo is 2003, 3inch TBE, 272/272, evo9turbo with 10.5/invidia o2 housing, fuel pump, hks dli.Â* thank you.

http://img339.imageshack.us/img339/9224/dsc07651bk0.jpg

[vroomevo]

btw, i am from socalevo.net.
so, only one post here in norcalevo. 8)

[earlyapex aka jack ass]

What load are you hitting and/or targeting? What RPM are you spiking? What gear? What is your BCS hardware? Stock with new turbo side pill or solenoid side pill taken out?

[vroomevo]

What load are you hitting and/or targeting? What RPM are you spiking? What gear? What is your BCS hardware? Stock with new turbo side pill or solenoid side pill taken out?


What load are you hitting and/or targeting? What RPM are you spiking? What gear? What is your BCS hardware? Stock with new turbo side pill or solenoid side pill taken out?

I am hitting around 200-220's load, RPM in 3200-3700, 1-2-3rd gear(haven't really tried 4-5th gear yet).
I am using AC delco/GM boost solenoid without any pills.

someone mentioned on evom that if i disable lean spool up, then i wouldn't have boost spike. hmm...i don't know about that.

[earlyapex aka jack ass]

Try this and see if it takes the boost spike away while still hitting your target boost:

WGDC:

2750: 62
3000: 62
3500: 62
4000: 64
4500: 68

BDEL:

2750: 135
3000: 135
3500: 135
4000: 135
4500: 135

220 load seems awefully low for that boost level and mods however, do you also have a different intake?

Do you still have the stock values in the error correction table?

[vroomevo]

Try this and see if it takes the boost spike away while still hitting your target boost:

WGDC:

2750: 62
3000: 62
3500: 62
4000: 64
4500: 68

BDEL:

2750: 135
3000: 135
3500: 135
4000: 135
4500: 135

220 load seems awefully low for that boost level and mods however, do you also have a different intake?

Do you still have the stock values in the error correction table?

thanks for the quick reply.
I will try that value tonight. it is like 110F out here in AZ. can't wait till go back to cali but not for a while.
i have HKS drop in filter with stock airbox and haven't touched error correction table.

but seems to be acute drop in WGDC, 97 in 2500RPM -> 62 in 2750.

[earlyapex aka jack ass]

You won't get full boost at 2500 rpm so you can leave it higher for better spool. If you end up spiking in the higher gears in lower rpm you can reduce it then.

Do you have boost logs as well?

[vroomevo]

thanks for the quick reply Bryan.

no i don't have boost log at this point, i still need to work on GM map sensor to ECUplus.

so hard to see both RPM and boost at the same time.

can't wait till try again.

btw, what's the thought on lean spool up thing??

[turbotiger]

thanks for the quick reply Bryan.

no i don't have boost log at this point, i still need to work on GM map sensor to ECUplus.

so hard to see both RPM and boost at the same time.

can't wait till try again.

btw, what's the thought on lean spool up thing??


I set mine to 7500 rpm.

[vroomevo]

Hello Bryan.
so i haven't tried values you suggested yet.
i reviewed my logs more carefully tonight.
yeap! i am hitting more than 230's.

rpm load
3000 145-160
3250 195-237(!)
3500 230-238
3750 230-235
4000 220-246(!)
4250 220-240
4500 230-240
4750 220-233
5000 216-230
5250 214-227
5500 213-220
5750 210-220
6000 210-216
6250 210
6500 204-207
6725 200's
7000 200's

these are highest/lowest load from different RPM from multiple pulls and 1/2/3rd gear pull. some were wot and some were TPS of 80-90's.

1) if i see big difference in ecu load in certain RPM, should I shoot for highest load or lowest load? ex: in rpm 3250 and 400?

2) I should not use the value you mentioned earlier b/c i told you that i am only hitting 220 load. which brings next question,

3) should i raise offset to 90 or even to 100 and lower BDEL, try to match my load above or just leave my offset to 85 and raise BDEL?

I really do appreciate your help Bryan.

every morning for past 3-4days (usually in 5-6am b/c that's only time when the air is cold in tucson), i do multiple pulls for an hour, come home, all stressed out and swear myself that i will buy EBC. but i really do appreciate your help, no one in tucson who can help me, they all have EBC's.

Chong

[earlyapex aka jack ass]

I usually set Offset to 100 so my little bird brain can do the math faster. ;)

Since it looks like you are referencing Calculated Load, the best thing to do without doing any ROM mods is to cross reference the timing in your log, if you aren't knocking, with the timing in your timing tables at each specific RPM. See if that matches up with the calc load.

So according to the load #'s above, Offset at 100, your BDEL table should look something like this:

3000 - 140
3500 - 140
4000 - 140
4500 - 140
5000 - 130
5500 - 120
6000 - 120
6500 - 110
7000 - 100

Then fine tune your WGDC so it doesn't overshoot or undershoot your target boost. It has to work in harmony with BDEL + Offset. Even if your BDEL's are spot on, and your WGDC too high, it will still overshoot.

:)

[XVeloX]

from what i can tell, calc load is usually spot on with 2-byte at peak spool, and then the closer you get to redline, 2-byte is always higher than calc. When i get home i can give more quantitative data, but usually i think the load is ~20 higher near redline.

also, if you are going to tune for something, be consistant. I wouldnt use a 80% TPS pull to tune where i would be @ 100%. You are more than welcome to tune @ 80%, but i would do that seperately from 100. Different loads every time...

[vroomevo]

from what i can tell, calc load is usually spot on with 2-byte at peak spool, and then the closer you get to redline, 2-byte is always higher than calc. When i get home i can give more quantitative data, but usually i think the load is ~20 higher near redline.

also, if you are going to tune for something, be consistant. I wouldnt use a 80% TPS pull to tune where i would be @ 100%. You are more than welcome to tune @ 80%, but i would do that seperately from 100. Different loads every time...

wow...that much different with 2byte vs calculated load. i guess i will have to work on getting 2byte load too.

tps of 80-90's, b/c i was overshooting into 1.6-1.7 bars and knowing that, i couldn't just wot. hehehe...
fortunately, a few knocks.

[vroomevo]

I usually set Offset to 100 so my little bird brain can do the math faster. ;)

Since it looks like you are referencing Calculated Load, the best thing to do without doing any ROM mods is to cross reference the timing in your log, if you aren't knocking, with the timing in your timing tables at each specific RPM. See if that matches up with the calc load.

So according to the load #'s above, Offset at 100, your BDEL table should look something like this:

3000 - 140
3500 - 140
4000 - 140
4500 - 140
5000 - 130
5500 - 120
6000 - 120
6500 - 110
7000 - 100

Then fine tune your WGDC so it doesn't overshoot or undershoot your target boost. It has to work in harmony with BDEL + Offset. Even if your BDEL's are spot on, and your WGDC too high, it will still overshoot.

:)


thanks Bryan, i will try to match my timing with calculated load.

[turbotiger]

If you log the WGDC, you can see where the error correction kicks in. That way you can see whether you need to lower or raise the WGDC. If you do that, the error correction kicks in about 500 rpm later, so adjust your BDEL or WGDC about 1000 - 500 rpm before the WGDC kicks it up or down giving you the staircase effect.

[XVeloX]

well i stand corrected. It differs all over the place, but i saw 15-20 units different between 2byteload (light, thin red line) and LoadCalc (thick red line, labled 636cc for injector sizing).

http://www.box.net/index.php?rm=box_download_shared_file&file_id=f_72712601&shared_name=ugqqu8vd5e

[turbotiger]

Evoscan calculates their load differently than mitsulogger

[XVeloX]

Evoscan calculates their load differently than mitsulogger



oh

http://www.box.net/index.php?rm=box_download_shared_file&file_id=f_72714135&shared_name=thqmsr4qgt

http://www.box.net/index.php?rm=box_download_shared_file&file_id=f_72714119&shared_name=bjmity0mo6

[vroomevo]

more reading tonight, getting 2byte load into ecuflash, getting ready to log WGDC, disabled lean spool up.
it's still hot here in Tucson, it's like 90's!!!
maybe will wait till tomorrow morning for the actual log.

[earlyapex aka jack ass]

If you don't have a wideband I would urge you to not disable lean spool but move it out to 7800 from 7000.

[turbotiger]

Evoscan calculates their load differently than mitsulogger

oh

As you can see Load on both is different, but Load Alt on mitsulogger is the same formula as evoscan

[vroomevo]

alot of variation, calculated load vs 2byte load.

rpm load cal 2 byte load
3000 145-160 158 161 159 174 155
3250 195-237(!) 185 196 185 201 187
3500 230-238 230 252 230 244 248
3750 230-235 262 250 262 255 248
4000 220-246(!) 250 250 248 243 240
4250 220-240 237 240 237 236 230
4500 230-240 242 240 242 241 230
4750 220-233 254 250 254 250 240
5000 216-230 260 260 260 252 247
5250 214-227 263 260 263 257 244
5500 213-220 260 260 261 260 250
5750 210-220 256 256 256 254 250
6000 210-216 253 251 253 251 319
6250 210 250 240 250 247 238
6500 204-207 243 240 243 240 236
6725 200's 237 235 231 234 234
7000 200's 231 225

i started from the beginning, zero out correction factor and trying to get 2byte ecu load.
as you can see above, cal load and 2byte load is a bit off(!)...

now i am going back to the BDEL table and trying to match my target load to actual load.

hope everything goes well.

also, now i am logging WGDC so, will see how things go.

thanks everyone.

[vroomevo]

it's almost done!!!
for past a couple of days, WOT and flash, WOT and flash, WOT and flash....
anyways, it's almost done. spool up is a bit problem, i get 1.3bar then it goes upto 1.4bar, occasional 1.5bar.
thanks for the help everyone. my friends' are quite impressed with the boost controller.
will update more...
Chong

[turbotiger]

If you see stairstepping up in the WGDC logs from 4k+ rpm, the TBEC is kicking in, so you'll have to decrease your BDEL settings. Unless you want to run 1.5 bar, then you need to increase your WGDC everywhere you're running less than 1.5 bar.

It'll also help if you post some settings and logs.

[vroomevo]

it is so tricky. if i set lower WGDC to get 1.4bar, then i would have to lower the BDEL in certain RPM range b/c my actual load also decrease since i am only getting 1.4 bar.

if i were to log, what gear is good? i have 03 5 speed, so 3rd gear WOT log is good enough, right?
i will post up my current setting and log(RPM, 2byte load, WGDC) later.

thanks.

[turbotiger]

Yah, 3rd gear is the preferred gear. Long enough to get a good sample, yet you'll still be traveling at sane speeds on the freeway.