How race gas help stocks STI's 1/4 times??
04-11-2005 | 08:27 PM
#18
Angry Dan
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From: www.turboculture.com
Car Info: 05 Evo VIII
Originally Posted by gpatmac
I'd be among that group.
My $.02.
-What slows your car down? Pulled timing or too much fuel.
-What normally causes those two conditions? Knock makes a stock ECU divert to a lower ignition advance multiplier, ie it defaults to a lesser aggressive map.
I can't think of a condition where the stock ECU forces the mixture to be TOO rich. Many aftermarket ECU's/piggybacks come with pig rich fuel maps, but that's an existing condition not a reflexive condition like pulled timing.
-What effects do racegas have on an engine? More resistance to pre-ignition. Burns hotter.
I have never heard of any cases of misfire due to the use of race gas. I can't think of any reason at all as to why race gas would slow any car down.
My $.02.
-What slows your car down? Pulled timing or too much fuel.
-What normally causes those two conditions? Knock makes a stock ECU divert to a lower ignition advance multiplier, ie it defaults to a lesser aggressive map.
I can't think of a condition where the stock ECU forces the mixture to be TOO rich. Many aftermarket ECU's/piggybacks come with pig rich fuel maps, but that's an existing condition not a reflexive condition like pulled timing.
-What effects do racegas have on an engine? More resistance to pre-ignition. Burns hotter.
I have never heard of any cases of misfire due to the use of race gas. I can't think of any reason at all as to why race gas would slow any car down.
l
l
l
Great post Pat!!!
Man it feels good to actually be talking about real motorsport type stuff on HIIC again.
04-11-2005 | 08:39 PM
#20
Angry Dan
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From: www.turboculture.com
Car Info: 05 Evo VIII
Originally Posted by Private51
can I make 93 by just adding a bottle of octane booster??/
No, but you can use this chart to make 93...but I would run 94. ( This chart sucks I'm looking for the one from 76 right now. But the #'s are the same.)
04-11-2005 | 08:53 PM
#22
Registered User
Joined: Nov 2002
Posts: 643
From: At work
Car Info: Real Slow
according to the chart above, i had 94 to 95 octane with 100/91 oct mix and ran a 13.1 @ 104 mph.
on 91 **** i ran a 13.7 @ 99 mph. both with same 1.8 60ft. at 2200 ft. elevation.
that's my proof.
on 91 **** i ran a 13.7 @ 99 mph. both with same 1.8 60ft. at 2200 ft. elevation.
that's my proof.
04-12-2005 | 01:31 AM
#23
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From: Southern California
Car Info: 2016 Z51 C7, 2007 Exige S, 2008 ZX-10R, 2016 Taco
Haven't
seen this addressed, but you can't put race gas in and expect the ECU to magically sense the difference immediately. You need to reset the ECU or do the Vishnu trick to take advantage of the most aggressive timing possible. I run race gas at the track when I run a bit higher boost, but I also (accidently) have seen 23+ lbs of boost (8-10 times) when I had my hoses wrong with a Stage 4 on pump gas. No knock activity. None. A cool morning and my FMIC probably saved the day.
San
San
04-12-2005 | 08:06 AM
#24
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From: Lastweek Lane - Watertown, NY
Car Info: 02WRXpseudoSTiWannabeWagon
San,
From my understanding, the ECU moves towards agressive only if it's not seen any knock nor misfire and vice versa. If it's already on a 16 IAM map, it will be prepared for any higher octane fuel.
From my understanding, the ECU moves towards agressive only if it's not seen any knock nor misfire and vice versa. If it's already on a 16 IAM map, it will be prepared for any higher octane fuel.
04-12-2005 | 03:46 PM
#25
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From: At work
Car Info: Real Slow
Originally Posted by gpatmac
San,
From my understanding, the ECU moves towards agressive only if it's not seen any knock nor misfire and vice versa. If it's already on a 16 IAM map, it will be prepared for any higher octane fuel.
From my understanding, the ECU moves towards agressive only if it's not seen any knock nor misfire and vice versa. If it's already on a 16 IAM map, it will be prepared for any higher octane fuel.
https://www.i-club.com/forums/showth...shnu+ecu+trick
04-12-2005 | 07:47 PM
#26
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Car Info: 2016 Z51 C7, 2007 Exige S, 2008 ZX-10R, 2016 Taco
Agreed
Pat, but if you're not logging constantly, you don't know if you've seen knock and what current timing is. If you reset the ECU, you've "erased" any knock and you're starting fresh. For early STIs and even some WRXs, an ECU reset or Vishnu reset can't hurt.
San
San
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