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Does race goes actually raise your a/f ratio as seen on a wideband or does it just make your car able to run more timing and be tolerant of a higher a/f? The reason I ask is I put (2) gallons of 101 mixed with about (4) gallons of 93 at the track last weekend. That would put me around 95.6 octane. As I mentioned in my other thread, at the top of 3rd on the topend the car started leaning out as my fuel system apparently isn't up to task. It got as high as 12.0, maybe 12.1! Just curious how far I pushed my luck. Everything seems to be ok, but I don't think I'm gonna run it on the race tune again until I make some changes.
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The increased octane decreases burn rate and therefor decreases the probability of detonation.
The octane will make it run richer, you're running out of pump.
For example, last season I ran some C16 in my car because they were out of what I normally run. It slowed down .3 and went off the charts rich... -
So if I was seeing 12.0 on the wideband, that would be even higher on pump gas? Dayum! Piecing together my fuel system slowly. I'm guessing the pump, injectors and rails are probably suspect. I've already got an A1000 and some 60's but need to get the rest.Comment
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Exactly. It would be considerably higher - if it lived long enough to read the wideband.Comment
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This may be why I've had issues in the past. Hooray for datalogs!Comment
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Pay attention to the specific gravity of the fuel. Leaded race fuel generally has a lower rating, meaning even with the same jetting or injector duty cycle you are actually getting less fuel into the cylinders.
You need to tune the car with the same fuel every time, even switching from 110 unleaded to 112 leaded can cause a big enough difference in the fuel mixture to burn holes in pistons depending on what fuel.Comment
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