What would the ideal A/F curve look like?
04-09-2004, 07:17 AM
#15
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Yeah, I would agree thats too lean, but also keep in mind that the 1.8T has a MUCH higher...
knock threshold than the subbies do. The highest I see Evos go on pump gas is high 11's when running 20 psi.
04-10-2004, 05:53 AM
#17
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Re: Yeah, I would agree thats too lean, but also keep in mind that the 1.8T has a MUCH higher...
You are correct, the EVO has a much higher knock threshold than a Subie, and the 1.8T probably does as well. I have seen EVO's at 12:1 on pump. (Shiv tunes at 12:1 for example)
I would not put much faith in the A/F charts John shows as I believe they were done with a sniffer. The DBW chart looks to be incorrect IMO.
I am running 11.5:1 or higher now on the STi RA motor with W/I.
I would not put much faith in the A/F charts John shows as I believe they were done with a sniffer. The DBW chart looks to be incorrect IMO.
I am running 11.5:1 or higher now on the STi RA motor with W/I.
04-10-2004, 08:05 AM
#18
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Curious... how is a tailpipe sniffer any different than a wideband sensor mounted in the downpipe?
The readings may be a bit richer than at downpipe, but its using the same type of sensor, no?
-Dave Pramanik
-Dave Pramanik
04-10-2004, 11:38 AM
#19
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I think the idea is that there is nowhere for the exhuast to escape with the wideband 02
whereas with the sniffer, some gas might sneal by..just a guess.
