rat

Is it measured before or after the cat? If using the stock o2 sensor it would be before the cat. If the dyno has a tailpipe wideband it will read leaner than the stock sensor.

Motorway Justice

:: sad face :: I thought I posted the thing up about the air fuel ratios... I've just died a little on the inside.

jwhitten

It is a stock file tomorrow I will post the log file and the tune

from 3k-4.4k is 13.6 then from 4.4k to 6.1k it steadily drops to 12.04

Maybe something is not right with my car but it is a stock tune

supermantxz24

max power is in the 12.8-12.9 a/f jwhittens scanner isnt messed up because when stevo dyno tuned another guys car on here he was in the 12's at wot also. i have been tuning a couple of cars and i have noticed on the last car i tuned his afr was in the 14's at wot but my stock tune and a couple of others where in the 12's i have been trying to figure out why that cars af was so lean and ours where rich

jwhitten

here for all you people that want to argu with me

This is my stock tune and the tune that was used in the following log file
http://www.datafilehost.com/download-e55ccc2a.html

here is my log file with the tune above
http://www.datafilehost.com/download-e55ccc2a.html

these are HPT files so look if you want but I am not B.S.ing when I said that was my AFR.

leahciM

Too MUCH fuel is bad just like not enough is bad. You need it jusssttt right.

peachpuff

For those that don't have hpt here is the afr under wot at these rpm.

1200 - 13.1
1520 - 13.1
1760 - 13.1
2000 - 14.0
2520 - 14.0
3000 - 14.0
3520 - 14.0
4000 - 14.0
4520 - 13.7
5000 - 12.9
5320 - 12.8
6000 - 12.8

Too lean you say? Do some research on direct injection.

Area47

Lambda AFR Gasoline AFR LPG AFR Diesel AFR Mehanol
1.10 16.17 17.05 15.95 7.04
1.08 15.87 16.74 15.66 6.91
1.06 15.58 16.43 15.37 6.78
1.04 15.29 16.12 15.08 6.66
1.02 14.99 15.81 14.79 6.53
1.00 14.70 15.50 14.50 6.40
0.98 14.40 15.19 14.21 6.27
0.96 14.11 14.88 13.92 6.14
0.94 13.82 14.57 13.63 6.02
0.92 13.52 14.26 13.34 5.89
0.90 13.23 13.95 13.05 5.76
0.88 12.93 13.64 12.76 5.63
0.86 12.64 13.33 12.47 5.51
0.84 12.35 13.02 12.18 5.38
0.82 12.05 12.71 11.89 5.25
0.80 11.76 12.40 11.60 5.12


do not band aid it. fix the maf.

JPizzle

That is just a bunch of numbers to me.....

jwhitten

So area is my car car the same as all the others you have tuned? Or is there something wrong with it? Of course it does not matter anymore because I run a flat 12.8 across the board now but I would like to know what you think about my stock tune.

Area47

every single one i have tuned, i have not had to mess with the maf in any way shape or form. the afr is dead on what i want it to be.

stock tune is a stock tune. i didn't see anything major in there to be worried about. however, you did upload the same map twice

Terminator2

My MAF error was only 1% stock and only 2% with my Dejon intake and all other mods. No changes are necessary if you have a Dejon intake. CAIs probably need some MAF tweaks because the distance between the filter and the MAF meter is drastically changed.

jwhitten

Sorry here is the log file

http://www.datafilehost.com/download-96215c71.html

stg2ss

I have the hahn intake but my A/F seems to be fine am I ok or do I need to do something since the Maf was relocated

Terminator2

For optimum driveability and performace you should have a tuner check your MAF error %. If it is greater than 4% which I would suspect it is. I would definately recomend tweaking your MAF tables.

stg2ss

I have areoforce interceptors and they read my MAF would should it read normally?

08slowbalt

So I've owned my 2008 SS for alittle over a year now. It has 3" mpx exhaust turbo back (catted), tuned to 20-21psi, Dejon upper, fmic, and K&N short ram intake. I think that's all lol, just got off of a midnight shift so my mind is in bed already. Car dynoed at 305hp@ wheels and 317ft lbs. in the last 4 months it has been giving me small fits. So I began monitoring a/f. It is spiking down to the lowest I've seen at 10.8 and coming back up to ~12.5. Is there any reason why this would develop? Or could it have always been this way and I never paid any attention? Also another issue, possibly related, from 4-6k rpm (wot) I'm getting a miss randomly here and there. No consistency and this is after the initial low spike in A/F. Be easy on me lol
Please provide me with some insight on these issues.

tomj77

iTrader: (2)

Lnf runs stock a/f of around 13 at wot and with a good tune u want 12.8 at wot. A 12.2 at wot you probably have a pig rich trifecta tune, get rid of it and get a proper tune.

tomj77

iTrader: (2)

Maybe we should make a list of faq for noobs on the lnf

umrdyldo

iTrader: (1)

Most of the tunes I have seen have been a lamda of 0.88 or 0.87. Gms1 is very similar.

tomj77

iTrader: (2)

12.8 is .88. I would go .87 with 91 but I'm running meth so doesn't matter. Found a huge leak iv had since day one , now I can run more timing lol I felt dumb

63 Nova SS

iTrader: (3)

How does dumb feel? Glad you found the leak!

tomj77

iTrader: (2)

Idk lol wondering why no matter how much meth u run u can't go past 15 degrees timing.

metroplex

Because it's not due to it running rich or lean. It is the nature of the beast with direct injected engines.

tomj77

iTrader: (2)

12.7-12.8 is the sweet spot.