Confusion with race gas ....
If you plan on running 29 psi kind of boost on C16 up to a year ago (pre ECUFlash) the easy thing to do would be run a SAFC with a slightly leaner mix. The wire the SAFC taps into for tricking ECM to run less fuel also indirectly changes timing (ECM thinks it's running lower load so the stock map timing is advanced, until it knocks, but some runs it doesn't).
The high boost, timing, and borderline fuel mix provided a sweet spot for putting some high end power in the 1/4 mile - like 0.005 seconds short of 11's with just mbc, tbe, and SAFC, VIII 6 speed (wasn't me of course)
If you don't want Ecuflash I bet you kind find a SAFC for $50 easy
The high boost, timing, and borderline fuel mix provided a sweet spot for putting some high end power in the 1/4 mile - like 0.005 seconds short of 11's with just mbc, tbe, and SAFC, VIII 6 speed (wasn't me of course)
If you don't want Ecuflash I bet you kind find a SAFC for $50 easy
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From: Central Jersey
Originally Posted by spdracerut
I'm pretty new to Evos but I'm guessing that 22psi on 93 octane is near the limit of getting knock. Going up to the 29 spike and holding 24-25psi is probably past the good efficiency point of the stock turbo so you're blowing more hot air than anything and probably getting knock, so the car is pulling timing.
I would just invest the $80 or so for the cable to hook up to the car, and ~$25 for the Evoscan software, and you'll be able to datalog everything. I'd keep an eye on MAF voltage and knock count. With the MAF voltage, you'll be able to see if you're actually sucking in more air (= more power) with the increased boost.
Also, I'd only run unleaded race gas.... lead isn't so good for the O2 sensor! Or cat for that matter.
I would just invest the $80 or so for the cable to hook up to the car, and ~$25 for the Evoscan software, and you'll be able to datalog everything. I'd keep an eye on MAF voltage and knock count. With the MAF voltage, you'll be able to see if you're actually sucking in more air (= more power) with the increased boost.
Also, I'd only run unleaded race gas.... lead isn't so good for the O2 sensor! Or cat for that matter.
As far as i know the race gas was unleaded but not sure if you go past 110. i think all of it might be leaded from there on up but not 100% positive
