Leaded race fuel?
#1
Leaded race fuel?
Ok, I 'm catless, been fighting issues with Knock Retard on tunes that others in a different region and 93 octane fuel see no knock.
I want to blend in some 110 octane leaded race fuel (all I can find locally @ $5.56/gal), maybe 4 gals or so a tank to up the octane a bit to see if that solves the issue, or if I'm getting 'phantom' KR from a flaky sensor, ect.
Question is, will the leaded fuel contaminate any sensors like the exhaust 02 sensor?
Opinions appreciated.
Thanks.
I want to blend in some 110 octane leaded race fuel (all I can find locally @ $5.56/gal), maybe 4 gals or so a tank to up the octane a bit to see if that solves the issue, or if I'm getting 'phantom' KR from a flaky sensor, ect.
Question is, will the leaded fuel contaminate any sensors like the exhaust 02 sensor?
Opinions appreciated.
Thanks.
#2
Senior Member
Ok, I 'm catless, been fighting issues with Knock Retard on tunes that others in a different region and 93 octane fuel see no knock.
I want to blend in some 110 octane leaded race fuel (all I can find locally @ $5.56/gal), maybe 4 gals or so a tank to up the octane a bit to see if that solves the issue, or if I'm getting 'phantom' KR from a flaky sensor, ect.
Question is, will the leaded fuel contaminate any sensors like the exhaust 02 sensor?
Opinions appreciated.
Thanks.
I want to blend in some 110 octane leaded race fuel (all I can find locally @ $5.56/gal), maybe 4 gals or so a tank to up the octane a bit to see if that solves the issue, or if I'm getting 'phantom' KR from a flaky sensor, ect.
Question is, will the leaded fuel contaminate any sensors like the exhaust 02 sensor?
Opinions appreciated.
Thanks.
#4
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#5
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Why not try a different tune? Maybe try a little less timing, or some more fuel?
I know you have tried alot, but if you don't mind, you could send me your map and some logs, I would take a look at it. Maybe if I get to the city we could get together and i could explore some options.
I know you have tried alot, but if you don't mind, you could send me your map and some logs, I would take a look at it. Maybe if I get to the city we could get together and i could explore some options.
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#7
Why not try a different tune? Maybe try a little less timing, or some more fuel?
I know you have tried alot, but if you don't mind, you could send me your map and some logs, I would take a look at it. Maybe if I get to the city we could get together and i could explore some options.
I know you have tried alot, but if you don't mind, you could send me your map and some logs, I would take a look at it. Maybe if I get to the city we could get together and i could explore some options.
I haven't tried that much since going catless. Loaded a 14* tune now to log this week.
I prob won't try the race fuel until next week. Gonna play with this tune some more.
Not too worried about the plugs, I'm used to burning those up from when I was a kid on leaded in the '65 Chevelle Malibu SS. Any sensor issues your way?
Last edited by Iam Broke; 09-07-2009 at 03:52 PM. Reason: Automerged Doublepost
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I've tried down to .85 lambda up to .89, I had to cut the timing to about 13 degrees to kill all the WOT KR when catted.
I haven't tried that much since going catless. Loaded a 14* tune now to log this week.
I prob won't try the race fuel until next week. Gonna play with this tune some more.
I haven't tried that much since going catless. Loaded a 14* tune now to log this week.
I prob won't try the race fuel until next week. Gonna play with this tune some more.
#11
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Tom, Just run it at 14* and 0.88-0.90 lambda. That would be far better than running at 0.83 lambda and 16*. Better to tune for the A/F that makes the most power and adjust timing to fit that A/F than to advance the crap out of the timing and then richen until the knock disappears.
#12
Yeah, I'm not giving up yet, just frustrated. I loaded up the 17* .9 lambda just to verify the KR is actually worse that lean. Same as the 14* tune, just more timing.
The only reason for the race fuel will be a test to see if the knock goes away or if I have a sensor issue picking up other hf vibrations somehow.
You guys are scanning knock retard, not total KR right?
The only reason for the race fuel will be a test to see if the knock goes away or if I have a sensor issue picking up other hf vibrations somehow.
You guys are scanning knock retard, not total KR right?
#13
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Yeah, I'm not giving up yet, just frustrated. I loaded up the 17* .9 lambda just to verify the KR is actually worse that lean. Same as the 14* tune, just more timing.
The only reason for the race fuel will be a test to see if the knock goes away or if I have a sensor issue picking up other hf vibrations somehow.
You guys are scanning knock retard, not total KR right?
The only reason for the race fuel will be a test to see if the knock goes away or if I have a sensor issue picking up other hf vibrations somehow.
You guys are scanning knock retard, not total KR right?
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#17
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is it bad to just throw in say c16 gas for a dyno run to see what it puts down? or do u need tuned for it just to run it that couple times to see good results?
cuz i was kinda interested in seeing what the car put down on 93 then race gas..
cuz i was kinda interested in seeing what the car put down on 93 then race gas..
Last edited by 06_SIC_SS; 09-09-2009 at 02:56 PM. Reason: Automerged Doublepost
#18
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The LSJ MIGHT adjust a little bit of timing, but not enough to make a noticeable difference. The LNF on the other hand probably will not pull any extra timing. (Not sure what motor you have, assuming LSJ?)
#19
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Gains will be nearly non existant unless you retune your timing for the C-16. Not worth the effort IMO.
#20
EDIT: Upping the timing 3* today, the KR is still 3* 200+ load above 5k rpm, WOT, no difference.
I'll add total KR to my scan and try again tomorrow. Race fuel Saturday for the ping test looks likely.
Boost dropped a bit when I went catless but increasing the flow will cause the pressure to drop me thinks.
Last edited by Iam Broke; 09-09-2009 at 04:39 PM.
#21
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ahh..that kinda sux.. but i understand it would change some things so it makes sense that id need a retune..hmm
Last edited by 06_SIC_SS; 09-09-2009 at 04:03 PM. Reason: Automerged Doublepost
#22
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Yep the higher ignition temperature of the C-16 means that unless you adjust the ignition timing and maybe lean the A/F out a tad depending on where you are currently power loss can occur because the mixture will not have sufficient time to burn completely.
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I don't see any misfire, I would expect to see that with a flaky coilpack. I know it's not the plugs, downpipe or intake 'cause I had it before those mods too & also with the air box K&N drop in mod.
EDIT: Upping the timing 3* today, the KR is still 3* 200+ load above 5k rpm, WOT, no difference.
I'll add total KR to my scan and try again tomorrow. Race fuel Saturday for the ping test looks likely.
Boost dropped a bit when I went catless but increasing the flow will cause the pressure to drop me thinks.
EDIT: Upping the timing 3* today, the KR is still 3* 200+ load above 5k rpm, WOT, no difference.
I'll add total KR to my scan and try again tomorrow. Race fuel Saturday for the ping test looks likely.
Boost dropped a bit when I went catless but increasing the flow will cause the pressure to drop me thinks.
#24
Dang, almost makes me wonder if there is possibly a slightly clogged injector or fuel line/filter. I have had instances where I can't shake the knock ti I turn the car back off and back on. Its odd. I figure its just a whacky anomoly in the beta tuner. But yours is constant and predictable, yes?
My KR was 3* today, except when I NLS 3-4, forgot the rev limiter was 7400, got some 4.5* KR during that ****.
I could take timing out of the whole curve, but then it wouldn't be the Terminator2 tune anymore. It's predictable, yes.
I'll send you a log & config via email from today. Can't send the tune, it isn't mine to disclose.
#25
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Isn't there a place online they will ship you 115 or something??
I just looked it up, www.buyracegas.com Sunoco 100oct $70.52/5gal....
I just looked it up, www.buyracegas.com Sunoco 100oct $70.52/5gal....
Last edited by cobaltltblue; 09-09-2009 at 07:37 PM. Reason: Automerged Doublepost