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View Full Version : Did some datalogs tonight, interesting spool up in 3rd gear! UPDATED



joshesh
12-10-2007, 03:20 AM
I thought it might be interesting to a few of you self tuners out there, i did a few logs in 3rd gear and then some in 2nd and finished up with a couple 4th gear pulls.Â*

This is the log from my last pull, 21.6psi @ 2900 rpm, 24.3psi @ 3062 rpm :shock: - i just installed the GST open element air filter with the stealth stock airbox and now im overboosting a couple psi more than i should be running on 91 oct - but im holding 1-2psi more than with the stock airbox up top!

Sorry about the txt file, stupid forums wont let a excel file or csv file in?

PANGES
12-10-2007, 04:22 AM
did u retune for the cone filter? You normally have to.

PANGES
12-10-2007, 04:25 AM
U logging boost with the JDM MAP sensor on evoscan? Any chance you can give me a copy of that data.xml file you had to add the code to to make it work? lol. Everytime i tried it, it messed up my evoscan. lol.

steevo8
12-10-2007, 08:05 AM
What gear were you in on the last pull, and what psi was your car holding before the filter?

joshesh
12-10-2007, 09:00 AM
did u retune for the cone filter? You normally have to.

^ No i didn't retune for the filter, yet - i just installed it and did some data logs to send to Bryan so he can change what needs to be tweaked. I know i am overboosting a little bit now.



U logging boost with the JDM MAP sensor on evoscan? Any chance you can give me a copy of that data.xml file you had to add the code to to make it work? lol. Everytime i tried it, it messed up my evoscan. lol.

I am using the JDM MAP sensor on mitsulogger, not evoscan. I can send you a link to the evom thread i read that enabled me to log boost via datalogging. I am not an expert user of evoscan, so maybe someone else like Bryan can chime in and help you out with evoscan and the JDM MAP sensor.



What gear were you in on the last pull, and what psi was your car holding before the filter?

^This log was a the 4th gear pull, slightly up hill. I was hitting around 23-23.5 psi peak before adding this filter, maybe a 24psi spike - but nothing in the 26psi range i am seeing here!

I'll try to find an older log from before i did this filter install.

steevo8
12-10-2007, 09:19 AM
4th gear uphill would most likely be the reason why then. If a car is tuned for say 22-23psi in third it will hit higher psi in 4th due to higher loads, then you add the fact that its uphill and it adds even more load to it which=higher psi.

My pump map would hit 25psi in 5th, even though it was tuned for 22psi in 3rd.

joshesh
12-10-2007, 09:27 AM
^But did you ever see full spool by 3060 rpm? That is why i posted this log, it seems kinda like an abnormally fast spool up.

DoggDicker
12-10-2007, 09:55 AM
Sweet...too bad you can't use 4th in autocrossing...but good for the track...

DD

steevo8
12-10-2007, 10:15 AM
I think that's pretty close to normal for a higher gear on a stock turbo...

evo_ate_gsr
12-10-2007, 10:16 AM
Damn thats scary on 91.

joshesh
12-10-2007, 10:22 AM
Sweet...too bad you can't use 4th in autocrossing...but good for the track...

DD

I hear atwater is a 4th gear autox, maybe it will help there.



I think that's pretty close to normal for a higher gear on a stock turbo...

^ Really, i guess i havent scene many 4th gear logs then - i thought it would still spool up more near the 3400-3500 range, not the 2900-3000 range. Someone else should post a 4th gear pull and show me what they get?

UCB
12-10-2007, 10:32 AM
Yeah that sounds about right josh, in 4th/5th it spools much faster due to the higher loads. You should do a 5th gear pull for shits =P

Ive been over-boosting a bit lately in 4th and 5th due to the colder temps, I really need to turn my tbecs back on :P

earlyapex aka jack ass
12-10-2007, 10:48 AM
U logging boost with the JDM MAP sensor on evoscan? Any chance you can give me a copy of that data.xml file you had to add the code to to make it work? lol. Everytime i tried it, it messed up my evoscan. lol.



<DataListItem DataLog="N" Color="" Display="JDM MAP" LogReference="JDMMAP" RequestID="38" Eval="0.19347*x-14.5" Unit="psig" MetricEval="" MetricUnit="" ResponseBytes="1" GaugeMin="-15" GaugeMax="30" ChartMin="-15" ChartMax="30" ScalingFactor="1" Priority="1" Visible="false" />

Manifold Absolute & Relative Pressure
This is boost pressure, and may be represented as absolute or relative, depending on the ECU - some ECUs report both parameters, whilst some only report one. Absolute pressure in the manifold is relative to a vacuum. Subtract approx 14.5 PSI to get relative pressure. When boost pressure in the manifold is shown as relative to atmospheric pressure, negative values represent partial vacuums in the manifold.

MAP sensors do not know the local atmospheric pressure. To log boost in psig (what all boost gauges show and what people always use to discuss boost values), the conversion formula for the logging program needs to have an offset for your local atmospheric pressure. The general formula for the JDM Evo 9 MAP sensor is:

0.19347*x-b

where b is the local atmospheric pressure. The local atmospheric pressure is affected strongly affected by altitude. For example the pressure at sea level is 14.7 psi, but at 5000 ft, the pressure is 12.2 psi. That's a pretty big difference when you want to log boost. Use this table of altitude vs pressure to determine the offset pressure for your formula:

altitude (ft) local atmospheric pressure (psi)
0 14.7
500 14.4
1000 14.2
1500 13.9
2000 13.7
2500 13.4
3000 13.2
3500 12.9
4000 12.7
4500 12.5
5000 12.2
6000 11.8
7000 11.3
8000 10.9

*For example*, if you are living at 750 ft, then you'd want to use 14.3 psi as your offset, and the formula would be

0.19347*x-14.3

joshesh
12-10-2007, 10:58 AM
Yeah that sounds about right josh, in 4th/5th it spools much faster due to the higher loads. You should do a 5th gear pull for shits =P

Ive been over-boosting a bit lately in 4th and 5th due to the colder temps, I really need to turn my tbecs back on :P

I'll try a 5th gear pull later tonight when the roads are empty, so full spool at 3000 is normal - thats pretty cool.Â* I am going to attach some more logs from older pulls before the filter was added to show the amount more psi I can hold up top with the new GST filter! The file dated 12-09 is a 3rd gear pull from last night, the others are older 3rd gear pulls.

And thanks for the informative post Bryan, Im too lazy sometimes to go to evom and paste the info here. hehe

earlyapex aka jack ass
12-10-2007, 11:30 AM
http://www.norcalmotorsports.org/users/bryan/mods/EVO/tech/boost_openFilter_01.gif

From Josh's logs, just bolting on the filter.

joshesh
12-10-2007, 11:32 AM
http://www.norcalmotorsports.org/users/bryan/mods/EVO/tech/boost_openFilter_01.gif

From Josh's logs, just bolting on the filter.


Thanks Bryan for overlaying them for me, it looks like better spool up and holding an average of 2 psi more from 5k rpm to redline!

UCB
12-10-2007, 12:32 PM
Told you :P

joshesh
12-10-2007, 12:51 PM
^when did you tell me? I knew it could gain a bit more power from the boost holding better up top, i was just waiting for my HKS drop in to get dirty enough to justify upgrading to this. oops - better change my sig again.

UCB
12-10-2007, 03:56 PM
at the SD meet I told you that you were gonna hold a bit more boost up top, obviously something you already knew, but I still told you :P :P

joshesh
12-10-2007, 04:18 PM
oh yeah, more boost - wheeeee

PANGES
12-10-2007, 06:11 PM
U logging boost with the JDM MAP sensor on evoscan? Any chance you can give me a copy of that data.xml file you had to add the code to to make it work? lol. Everytime i tried it, it messed up my evoscan. lol.



<DataListItem DataLog="N" Color="" Display="JDM MAP" LogReference="JDMMAP" RequestID="38" Eval="0.19347*x-14.5" Unit="psig" MetricEval="" MetricUnit="" ResponseBytes="1" GaugeMin="-15" GaugeMax="30" ChartMin="-15" ChartMax="30" ScalingFactor="1" Priority="1" Visible="false" />

Manifold Absolute & Relative Pressure
This is boost pressure, and may be represented as absolute or relative, depending on the ECU - some ECUs report both parameters, whilst some only report one. Absolute pressure in the manifold is relative to a vacuum. Subtract approx 14.5 PSI to get relative pressure. When boost pressure in the manifold is shown as relative to atmospheric pressure, negative values represent partial vacuums in the manifold.

MAP sensors do not know the local atmospheric pressure. To log boost in psig (what all boost gauges show and what people always use to discuss boost values), the conversion formula for the logging program needs to have an offset for your local atmospheric pressure. The general formula for the JDM Evo 9 MAP sensor is:

0.19347*x-b

where b is the local atmospheric pressure. The local atmospheric pressure is affected strongly affected by altitude. For example the pressure at sea level is 14.7 psi, but at 5000 ft, the pressure is 12.2 psi. That's a pretty big difference when you want to log boost. Use this table of altitude vs pressure to determine the offset pressure for your formula:

altitude (ft) local atmospheric pressure (psi)
0 14.7
500 14.4
1000 14.2
1500 13.9
2000 13.7
2500 13.4
3000 13.2
3500 12.9
4000 12.7
4500 12.5
5000 12.2
6000 11.8
7000 11.3
8000 10.9

*For example*, if you are living at 750 ft, then you'd want to use 14.3 psi as your offset, and the formula would be

0.19347*x-14.3


Thanks Bryan. I followed that, but perhaps I kept copy and pasting it into the wrong area of the data.xml file. When I started my Evoscan, i got some error and it wouldn't start. Then I tried pasting it in another spot, and the "JDMBoost" section came up in the options and after I clicked it, it didn't log. Shrugs. lol. I tried this a while back. Maybe I'll go and try it again tonight.

earlyapex aka jack ass
12-10-2007, 06:22 PM
Which version of evoscan are you using?

You want to copy paste it under the <Mode2 name="Mode2" type="Data List Items"> section.

If you are using v99 or under use the Eval="0.19348x-14.5", not Eval="0.19347*x-14.5" as posted above (no * before the x)

PANGES
12-10-2007, 06:24 PM
Which version of evoscan are you using?

You want to copy paste it under the <Mode2 name="Mode2" type="Data List Items"> section.

If you are using v99 or under use the Eval="0.19348x-14.5", not Eval="0.19347*x-14.5" as posted above (no * before the x)


I'm using v1.0

earlyapex aka jack ass
12-10-2007, 06:32 PM
might be a v1 issue. I never got that version running well. Try v.99

PANGES
12-10-2007, 06:33 PM
might be a v1 issue. I never got that version running well. Try v.99


Ah I see. Any chance you know where to download v.99? On the site, it only offers v1.0. =/

earlyapex aka jack ass
12-10-2007, 06:36 PM
might be a v1 issue. I never got that version running well. Try v.99


Ah I see. Any chance you know where to download v.99? On the site, it only offers v1.0. =/


http://www.norcalmotorsports.org/users/bryan/mods/EVO/tech/ecuFLASH/EvoScan_versions/

PANGES
12-10-2007, 06:38 PM
might be a v1 issue. I never got that version running well. Try v.99


Ah I see. Any chance you know where to download v.99? On the site, it only offers v1.0. =/


http://www.norcalmotorsports.org/users/bryan/mods/EVO/tech/ecuFLASH/EvoScan_versions/


Damn. You're the man.

earlyapex aka jack ass
12-10-2007, 06:41 PM
you could also try the new v2 as it has the JDM MAP already built into the logger.

PANGES
12-10-2007, 06:45 PM
you could also try the new v2 as it has the JDM MAP already built into the logger.


Good point. I'll try the v.99 first though, since I'm not cool enough like you to use the v2 yet. lol.

Reminds me.. My bank sends my statements to my gf's house and one time she looked at it and saw the transaction for Evoscan, she was like "WTF did you just blow 20 bucks on?!?" Good thing I buy all my car parts in cash or else she'd have a heart attack. :)

earlyapex aka jack ass
12-10-2007, 06:47 PM
hahah. I still use v.99 :)

PANGES
12-10-2007, 06:48 PM
Well in that case, then I'm just trying to be cool like you and use v.99. :lol:

UCB
12-10-2007, 09:50 PM
oh yeah, more boost - wheeeee


damet I looked at mine today, Im over-boosting. 25psi in 5th at 2900rpm

Must enable tbecs! lol

joshesh
12-10-2007, 09:55 PM
dang kyle, be careful on that pump gas tune - add back the tbecs - ill send you my current tbec setup if you want?

joshesh
12-11-2007, 09:48 PM
more logs from tonight, 3rd gear pull!

rpmÂ* Â* Â* Â* Â* boost (psi)
3031 18.77
3093 20.125
3156 20.705
3250 23.027

UCB
12-11-2007, 10:01 PM
very nice! :D

joshesh
12-11-2007, 10:35 PM
anyone else have any logs showing quick spool on thier evos?

UCB
12-12-2007, 10:48 AM
I cant see to find all my old logs, Just got the new version of evoscan and such so I'll do some logs shortly

joshesh
12-13-2007, 01:06 AM
Cool, thanks for keeping my thread alive Kyle - we might be some of the only hobbiest tuners left on NCE.

byt
12-13-2007, 01:26 AM
lol i'll get back into it after i steal the gf's laptop to do some logging ;)

too bad the current software options out there don't work with my macbook

joshesh
12-13-2007, 01:30 AM
not even if you run vista or windows on your macbook? wouldnt that work?

byt
12-13-2007, 01:35 AM
i suppose but i haven't set up the dual boot yet. it's a company system and i'm not sure how happy they'd be with me tweaking the system in the name of t00ning. :lol: