What AFR do you guys run on 91oct?

[ChuckP]

Just trying to get a discussion going. This Advanced Tuning forum is kinda dead lately.

What ARF do you guys run? (91oct) Spoolup?, Peak torque?, tapering to what up top?


Meth heads too. AFR? 100% or 50/50?

[steevo8]

low 11's under boost

[earlyapex aka jack ass]

On Evo 9, 11.4/11.2 at peak torque, 11.0 to 10.9 up top, on 91

With meth, 50/50, 11.5-11.8

100%, 11.2-11.3

[ChuckP]

On Evo 9, 11.4/11.2 at peak torque, 11.0 to 10.9 up top, on 91

With meth, 50/50, 11.5-11.8

100%, 11.2-11.3


Bryan, is it necessary to taper up top. I notice some people run a steady AFR from 4k to redline.

[earlyapex aka jack ass]

On Evo 9, 11.4/11.2 at peak torque, 11.0 to 10.9 up top, on 91

With meth, 50/50, 11.5-11.8

100%, 11.2-11.3


Bryan, is it necessary to taper up top. I notice some people run a steady AFR from 4k to redline.


Depends on boost / timing / mods / what your car likes

[ChuckP]

If the stock turbo tapers to 18-19psi up top, wouldn't you be able to keep the AFR as lean as the midrange, and just add timing?, since there is less boost? I dont really know if im making sense.

[earlyapex aka jack ass]

Really depends on what the car likes.

Some evos I bring the AFR's up at redline.

[willitas34]

Andy you gonna chime in? :)

[ChuckP]

Really depends on what the car likes.

Some evos I bring the AFR's up at redline.


Interesting. .
Question, Â*Is it normal to see 21:1 on the wideband for a few seconds, when i put the clutch in after accelerating? Â*

[UCB]

Yes. You will also see that during engine braking.

[DoggDicker]

Who runs 91...it's either 100 or 110 fo ever...

DD

[JDMevoBOOST]

The trans doesn't like engine breaking.

[mtsevovii]

The trans doesn't like engine breaking.


rev match?

[UCB]

The trans doesn't like engine breaking.


Why not.

[Unowned]

i'm only running 20-19 psi boost, with 11.0-11.1 AFRs.

[evo_ate_gsr]

isn't it just a little harder on both clutch wear, and the tranny itself? Â*I thought I have heard that before. Â* Â*It doesnt seem like it would be bad Â*per say on the street on normal driving, but I can see how it would be bad to downshift like that with out a heel-toe or rev match at the track.

[UCB]

improper down shifting is different than engine braking

[ChuckP]

improper down shifting is different than engine braking


I agree 100%. Ive never heard of any harm coming from engine braking. Down shifting without rev matching while driving aggressively will put wear on the clutch.

[evo_ate_gsr]

engine breaking meaning just keeping the car in its current gear while slowing down... kinda like riding the gear down to a lower speed?

[UCB]

yes, thats my definition of engine braking at least

[evo_ate_gsr]

^^ Yea same here. i guess i assumed he meant hard downshifting.

[chrisw]

engine breaking meaning just keeping the car in its current gear while slowing down... kinda like riding the gear down to a lower speed?


that's what I have been doing in the 3 years and 95k miles with no problems

[evo_ate_gsr]

yea i know thats not harmful.

[JDMevoBOOST]

Yah I'm talking about folks that are down shifting and dont rev match. Causes the car to lurch while the car tries to match speeds.

Slowing down in gear causes no issues at all. What I'm talking about is folks that are coming off the freeway in fifth and then just pop it in fourth and let the clutch go with no throttle blip.

[evo_ate_gsr]

Haha everytime I heel-toe downshift or Rev match my car, some ricer or Mustang always thinks I'm reving on him. I hate that.

[ChuckP]

Haha everytime I heel-toe downshift or Rev match my car, some ricer or Mustang always thinks I'm reving on him. I hate that.


Haha. Its always an awkward moment.

[JDMevoBOOST]

Hahaha...yah and it sucks with stock clutch and fly cuz you really gotta step on that bish haha

[Omar@FIA]

Haha everytime I heel-toe downshift or Rev match my car, some ricer or Mustang always thinks I'm reving on him. I hate that.


Haha. Its always an awkward moment.


And then they take off really fast thinking they are racing with you, but in reality they are only racing with themlseves. Then they just feel stupid = D


Â* Omar

[evo_ate_gsr]

Exactly!!! And it happens a lot to me, then next thing I know I see I'm gettin paced on the road by the person next to me. haha its like dood.... i wasn't flexing on you, I'm tryna save wear and tear on my car bro! Calm the fuck down!

Seems like if you even told some people what you were doing, they probably wouldnt even know what it was you were talking about. Its cool though when other tuner see and hear it cause they know wsup. The funny ones is when they're not that good at their Heel toe, and you can hear the revs climb since they didnt blip the gas enough

[EFIxMR]

I run 11.0-10.8 afr, depending on what the car likes.