I'm sure this has been asked before, but i couldn't find it in search. Just curious how much daily boost are you guys running with our crappy 91 octane gas?
SoCal DSM 1996 RS-T: Under Construction 1999 GS AE: New daily driver "USING NO WAY AS A WAY, HAVING NO LIMITATION AS A LIMITATION"--BRUCE LEE
#94052, "RE: Cali Turbo guys..." In response to Reply # 5
Originally posted by ForceFed420a thedawg, that's with 91? Do you think that with 93 octane, you could have run 19+ psi on the stock ignition? Thanks, Brian
Yes, thats with CA 91 octane. I don't THINK anything. Put the fuel in your car, and tune for your engine. What works for one person won't work for everyone.
#94061, "RE: Cali Turbo guys..." In response to Reply # 9
FWIW, I've tried running Toluene to raise the octane to 98-100ish and ran into timing problems. I think fuel isn't as much a factor as ignition is at 18+. Jamesman's car runs 19-21psi on 91 octane with MSD DIS2 and Greddy Emanage. My goal is 25psi but I'll need MS&S to get there.
#94116, "RE: Cali Turbo guys..." In response to Reply # 10 Mar-23-06 11:13 AM by turbo8u
Originally posted by thedawg FWIW, I've tried running Toluene to raise the octane to 98-100ish and ran into timing problems. I think fuel isn't as much a factor as ignition is at 18+. Jamesman's car runs 19-21psi on 91 octane with MSD DIS2 and Greddy Emanage. My goal is 25psi but I'll need MS&S to get there.
hey dan,
gas has pre-ignition qualities, higher octane has less than lower octane...meaning its less prone to explode by itself under heat and pressure. a good example of a gas with pre-ignition qualities is diesel. diesels cetane # is like gas' octane number. drastic example is heptane which has a octane rating of 0. higher octane = less tendency to knock, pre-ignite, detonate...what have you, under heat and pressure....which is what more timing advance and boost bring.
anyway, in a perfect world...gas couldnt explode by itself, letting us run enough ignition timing for max power, push as much boost as we wanted...and not sling it apart all over the road. ignition timing has to do more with how high the cylinder pressures will peak.
i ran 22psi on a 16g with stock ignition and 19* timing advance if i remember right. the lower comp 8.6:1 CR wiseco pistons im sure helped. 91 octane....a sidemount and water/alcohol injection. i think the problem is the octane, not the timing. pull timing...pull power. also advancing it to much you can lose power as well. pressure peaks between like 15-20* IIRC. either way detonation is the killer, and higher octane is more beneficial than pulling timing, at least in my opinion.
edit: your problem may have been with a lean misfire or something, not enough fuel...something along the lines of fuel tuning. who knows... but i dont think ignition was the problem in your case.
_ _ _ _ _ _ _ _ _
96 Black ESi 91 Red TSI AWD (RIP) 02 WRX
"turnin wrenches for nine hours in the pouring rain, just to get the beast up and running again"
Aerospace Certified TIG welder for Precision Castparts in Portland, OR.
Search
Printer-friendly copy
3 Users in Chat
