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Old 08-12-2008, 03:29 PM   #1
STINOMORMONEY
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Default HELP- AFR HELL- should i be worried

ok like mentioned before 100 percent meth tune- tuned with sensor at exhaust tip- to 11.5 and my AEM wideband on downslope of DP reads 10.2 down to 10.0 (which is the minimum reading so it could be lower) do Ineed to freak out- I have not changed anything from the tune until now

My tuner says its just a difference between the TWO sensors and that the meth is making the wideband look richer than is actually is- is this true seems to me 1.5 or more is a HUGE drop and somethinhg isn't right but he says its fine as long as its not misfiring which as far as i can tell it is not

what should I do, should i be worried.....HELP

I want to trust my tuner but with such a big difference i am worried, everyone says mid to upper 11's for afr with meth but my wideband is way below that
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Last edited by STINOMORMONEY; 08-12-2008 at 04:03 PM.
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Old 08-12-2008, 04:09 PM   #2
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someone must have experience with this right- unabomber? someone?
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Old 08-12-2008, 04:20 PM   #3
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I don't know if this applies specifically, but could possibly explain it...I was reading through my LC-1 WBO2 booklet last night and on the very first page, under the introduction or whatever, it was explaining that different gasses have different "optimal" A/F ratios. Basically,(I don't remember specifics) but gasoline A/F should be at 14.7, but say methanol would be around 6.4 or something.
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Old 08-12-2008, 04:21 PM   #4
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Old 08-12-2008, 04:27 PM   #5
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thanks but i think that would be if i ran straight methanol as my fuel but i run 93 with meth injection- but i appreciate the effort
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Old 08-12-2008, 04:34 PM   #6
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When I tuned for 100 meth injection I never had problem with my LC-1. When I changed my map I was very suprised at how much fuel I pulled out......
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Old 08-12-2008, 04:40 PM   #7
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you never had a problem?? more info please what about my situations here
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Old 08-12-2008, 04:48 PM   #8
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with 100%meth

afr should be 12:1 or MORE(like a LOT leaner than usual)

that rich is doing you no good

and there is a HUGE forum on this board JUST for this kind of thing
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Old 08-12-2008, 05:04 PM   #9
STINOMORMONEY
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i know what it is supposed to be thats why the 11.5 was fine on my tuners afr sensor but MY AEM wideband says 10.2 and lower so my question is is their usually this difference is afr between the wideband in the dp and the afr for the tune with his sensor in the pipe
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Old 08-12-2008, 06:34 PM   #10
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anyone have some real knowledge about this, tuners??? etc???
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Old 08-12-2008, 08:23 PM   #11
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dont mean to bump it again but i could REALLY use some point of views on the matter
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Old 08-12-2008, 09:07 PM   #12
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Quote:
Originally Posted by STINOMORMONEY View Post
dont mean to bump it again but i could REALLY use some point of views on the matter
YOU ARE ASKING IN THE WRONG FORUM

WAKIE-WAKIE
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Old 08-12-2008, 09:22 PM   #13
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then what- accessport tuning or water meth injection

if so unabomber please move this thread or someone so i dont double post
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Old 08-12-2008, 09:32 PM   #14
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First off, I am a tuner. I tune lots of cars in my area including my own WRX which has methanol injection, and although I do not run 100%, I do have quite a bit of experience with all different ratios of meth to water.

There is a reason that the two readings are skewed. The sensor in the tip is going to be much less accurate because the exhaust is still expanding in the pipes. This means the exhaust will be more spread out further down the pipe, thus reading lean, therefore, believe the sensor in the DP.

Now, if you are running meth, 10.0 and 10.2 are both much much too rich. You should be shooting closer to 11.8 or 12.0 depending on what your EGT looks like.

Running 100% meth generally yields near the same gain as running 50/50 meth and distilled water.(If you want a reason for this, PM me). It does however cause an issue. This issue is that in the event of an accident, if the contents of your meth tank spills 100% meth it will be highly flammable and therefore dangerous, where if you ran 50/50, the mixture is not flammable(much safer).
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Old 08-12-2008, 09:41 PM   #15
STINOMORMONEY
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pmed but u think the difference in afr is bull and to get it fixed (w/ anothjer tune)
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Old 08-13-2008, 08:40 AM   #16
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is there a difference between this thread and your other one?
http://forums.nasioc.com/forums/show....php?t=1574240
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Old 08-13-2008, 02:41 PM   #17
STINOMORMONEY
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no i thought that one got deleted i couldnt find it
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