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I think most of the power the 100 octane tune make is from the IAT multiplier table. Less timing is pulled at the higher temperatures.
Yes and that's why not knowing what the OAT was on the both the before and after runs tells us very little.
In no way criticizing the OP.
Just saying without data we cant know how much the fuel and tune actually contributed to the increase speed on the front straight.
Good info regardless.
Yes and that's why not knowing what the OAT was on the both the before and after runs tells us very little.
In no way criticizing the OP.
Just saying without data we cant know how much the fuel and tune actually contributed to the increase speed on the front straight.
Good info regardless.
100 tune worked for me. Car ran hot and "limped" at Mid-Ohio and would not recover for the rest of the day. Following year with the GM tune lap times were lower and top speed went up markedly on back straight. And I never got to limp mode. It is not a scientific test but obviously the tune allowed the car to run higher temps and not de-tune. I do feel the aero held back top speed in both cases. GM tune and GM performance alignment made the car what it was supposed to be and very enjoyable the past two years. If it was not a limited production car, I would do more modifications. But this car will stay what it is and with the small upgrades from GM, it performs like the car it was meant to be.
it backs up what another user in another thread was saying about the timing being changed, which causes less exhaust heat... and thus more power since heat is kept in check.
How do your cars run when you throw regular 93 back in, no problems?
it backs up what another user in another thread was saying about the timing being changed, which causes less exhaust heat... and thus more power since heat is kept in check.
How do your cars run when you throw regular 93 back in, no problems?
I have the same question, seems to me the car won't like the lower 93
my dealer did not know about the GM tune when I inquired. What info. do I need to have this done?
The 100 octane tune is a Chevy Performance Parts upgrade, you can reference the part # in the catalog. You can also find certified Performance Chevy dealers on the Chevy Performance Parts website who would be more knowledgeable.
You do have to realize the 100 Octane Tune requires the owner use 100 Octane fuel on track to get the extra performance.
If they use 93 there may not be any increase in performance. At the track 100 Octane fuel is about $8/gal Vs $4.25/gal for 93 Octane. Assume 45 gallons of fuel consumed per day and you are talking about $170/day more in consumable costs.
That is a lot of extra cost when you only get 7 mph at the end of a very long back straight. It would be less costly to figure out how to come off the corner 1 or 2 mph faster than you did before to get a higher speed at the end. That 1 or 2 mph starting advantage usually reduces elapsed time from the start of the straight to the braking point since it is there from the beginning of the straight and it takes a huge HP/weight advantage for another car to over come that small starting line speed difference.
Personally, I have not had any negative effect from running 93. However the warranty states if there is a failure and the fuel tested is not 100 the warranty may be voided. I run 93 daily and upgrade on weekends and definitely for track purpose. Common sense works well here. The effects of high octane does not make more power actually it may make the burn slower and less likely to pre-detonate. Fuel mileage often goes up with lower octane because the burn or power is quicker and is capable of providing what in a sense would be advancing timing. Now this can be debated in many ways. i'm just saying if the car is not abused and spark knock is not present, the lower octane works just fine. I have not run the car in an extended pull or quarter mile run using lower than recommended octane. My wife would not hurt the car driving normally. A teenage son might. GM has to state the obvious to maintain the safety levels.
The tune does what it is supposed to. i would like to hear about 1/4 mile runs etc with the tune and without and possibly running 93 if someone feels like pushing the limits a bit. an N-gauge or equivalent would be helpful to determine the limits showing detonation and IAT's etc. I have one but it is currently designated for the other car that is definitely pushing the limits.
You do have to realize the 100 Octane Tune requires the owner use 100 Octane fuel on track to get the extra performance.
If they use 93 there may not be any increase in performance. At the track 100 Octane fuel is about $8/gal Vs $4.25/gal for 93 Octane. Assume 45 gallons of fuel consumed per day and you are talking about $170/day more in consumable costs.
That is a lot of extra cost when you only get 7 mph at the end of a very long back straight. It would be less costly to figure out how to come off the corner 1 or 2 mph faster than you did before to get a higher speed at the end. That 1 or 2 mph starting advantage usually reduces elapsed time from the start of the straight to the braking point since it is there from the beginning of the straight and it takes a huge HP/weight advantage for another car to over come that small starting line speed difference.
Bill
Good point but:
Just consider whether you want to track the car or not. And if you are capable of using the car hard enough to get the heat levels up. The primary reason the tune was developed by GM was to help alleviate the Heat Soak de-tune "limp" mode the car goes into when pushed on track. Some even get there during spirited street driving. For most the tune is not required. GM has bought these cars back and been sued many times for the misrepresentation of a track capable vehicle. This made the problem bearable and for most that do track the car it solved the problem. Cost is a factor in everything we do when performance is involved. The tune was the least expensive way to enjoy the car fully on track. Personally, my next step would be to run a methanol injection to help bring temps down and allow for higher boost and sustained high temp runs. But I have been struggling with doing any non GM performance modifications.
04-30-2019, 11:28 AM
100 octane tune track day
