Hey guys, I was wondering if i could get a sample of what some of you guys are running for both timing and AFR. My tuner set me at i believe 17 degrees give or take and said he felt it was safe on 12.0 afr.

From what i have read, because our cars are DI, they like alittle leaner mix than most cars are used to. What are you running? Seems like i see 12.0-13.0+-. Whats considered overboard?

I am running 93 oct, but the car was tuned on 91 and i am set at 22psi.

 

A little rich for my blood, but if it'll take 17* on pumpgas I guess that's ok.

.88 lambda or around 12.9 AFR is about the sweet spot. I could never run that much advance until I added ethanol.

 

I run a .87 Lambda which is about a 12.7-12.8 AFR. I'm currently running 15 degrees of timing up top but I've been able to squeeze 17. I don't feel comfortable with it there yet. I've seen some KR as much as 3.0 from time to time so I cut it back to the 15. With the Meth installed, I hope to be WAY up there

 

subd to see what all you guys have to say

 

im commanded at 12.6 at WOT

 

My more aggressive pump gas tunes are running. 87 lambda and 18-19 * if you wanna see the tune i will show it lol. I took enough time on these tunes to have 2 kids Hahaha. Im jk but I've been able to run 18-19 of timing as long as the maf fuel trims were a ok..........

 

Good info fellas, also my first post was miss information. Dont know why i thought i was tuned at 12.o afr and 17*. I am at 12.2x commanded and 14* up top with zero knock. My tuner felt this was more than safe, i feel the same. Next up is an E85 tune. I just wanted to see where you cats were at.

 

I've run 18* up top on Shell V-power with no problem. But 14-15 at what IAB said for AFR is a good spot for 91 and 93

On ethanol.. 26 haha

 

my car is 12.63 with 14 * at wot

 

I'm on a relatively conservative e47 tune running 22psi, 20* advance, .88lambda (12.9:1)

In general most tuned LNFs will see about 14*-15* at most on pump gas without any knock issues. Anything beyond that can get a little iffy especially when you start incorporating hot humid oxygen depleated summer air.

but like I said though, this is a generalized statement..

For example, this guy's car seems to absolutely love timing somehow..

wow.. 18* on 93? That's some amazing gas you got there man..

 

.88 AFR and 16* up top is as far as i have pushed it on 93

 

I'm not sure about the timing 17* maybe, with .5 kr in the lower to midrange on 93 pump. and the a/f is 11.8-12.0:1, didn't make any more power at 12.8:1 so I figured the extra fuel would help with cylinder temps and keep the tune a bit safer.

 

.88 lambda or 12.93 afr and 17.5 degrees timing up top.
thats on 93 octane. still see some occasional knock up to 3.8 degrees.

 

wow.. to be honest I'm a little surprised to see people running over 16* on 93 with no serious KR issues. I'm very aware that every car is different especially in different climates but it just strikes me as a recipe for detination. Are you guys assuming there is no KR or are you logging the vehicle yourself and know everything is peachy for yourself?

 

i log mine quite often. i only see kr once in a while. when i do, half of that
is only on 1 cyl. so i figure its probably false knock anyways. its rare that
i get kr and it pulls timing. (it has happened though). worst kr i've ever seen
was 3.8 degrees.

 

That's pretty damn good man. I know my car definitely didn't like anything over 15*, but there again is just the difference for each vehicle in a different climate. The 3.8* of KR you were seeing could have even been false knock as well. I know I used to have an annoying issue with it last summer (between 2*-4*) that at first I though was actual knock.. long story short, it ended up being false knock which I was able to resolve

 

logged it while tuning.

 

12.6 afr with 15 degrees of timing. Any more timing on 93 octane and it would knock.

 

What was wrong because I'm having a similar issue.

 

18* was very up top and ramped in smoothly and gently.

It was kind of scary running that much timing, and only on about 17-18 lbs of boost in cool weather for a few weeks.

As for logging, I log every day with VCM scanner.

 

o0o0o0o0o0ohhhh.. ok that makes alot more sense then. Of course I realize the timing is ramped in and is your peak timing up top but I was assuming you were pushing over 20lbs of boost with that much timing on 93 octane. I seriously couldn't wrap my silly little head around how you safely ran that much timing.. lol I get it now though..

 

Haha yeah, over 20psi, the most I will go on a tune is 15*.

 

I think it's pretty funny. If you rewind a year in the forum, people were trying to run 20* up top on 93. I said the most I could get was 15* on my tune, and people thought I was doing something wrong.

Even with a max of 15*, I need to splash in some 100 octane when I go to the track, or I start getting knock after a lap or so.

 

all hail Wangspeed..

are you seeing knock after 1 lap due to high IAT's?

 

Most I could squeeze on 91 with 20 psi was 11* up top. Nowhere has worse gas, now I'm e47 and running 20* up top with no knock.