should I tune for non-texas gasoline?
#1
Tour de Franzia
Thread Starter
iTrader: (6)
Join Date: Jun 2006
Location: Republic of Dallas
Posts: 29,085
Total Cats: 375
should I tune for non-texas gasoline?
We get sweet, glorious 93-octane fuel in Texas. However, I frequently run my car at a track in Tulsa where I can only get 91-octane. Sure I can fill up with "purple" at the track, but that's a pain in the ***.
Should I fill up with 91-octane and tune-out any possible detonation, or just back timing off and listen for detonation in my headphones? I hit MBT in every cell, and even went 2* further to see if it added torque or power, without detonation...so I may not need to adjust much.
I know people say a little detonation won't kill the motor immediately...but is that true at the power I'm putting down? I enjoy laughing at all these people who pour tolouline in the tank before they run on the track...but don't think they need it on the street. I don't want to play chemist on something I've spent so much money on.
All the headphone haters need to recognize.
Should I fill up with 91-octane and tune-out any possible detonation, or just back timing off and listen for detonation in my headphones? I hit MBT in every cell, and even went 2* further to see if it added torque or power, without detonation...so I may not need to adjust much.
I know people say a little detonation won't kill the motor immediately...but is that true at the power I'm putting down? I enjoy laughing at all these people who pour tolouline in the tank before they run on the track...but don't think they need it on the street. I don't want to play chemist on something I've spent so much money on.
All the headphone haters need to recognize.
#6
Moderator
iTrader: (12)
Join Date: Nov 2008
Location: Tampa, Florida
Posts: 20,650
Total Cats: 3,010
Gotcha.
Wow, what happens if some douche tries to beat you on the inside in a braking section coming into a corner and blows it?
Do you have a backup to get home?
After you tear off the guy's left arm and beat him to death with it, of course.
Wow, what happens if some douche tries to beat you on the inside in a braking section coming into a corner and blows it?
Do you have a backup to get home?
After you tear off the guy's left arm and beat him to death with it, of course.
#9
Because your dyno's resolution is worse than how much power you would lose if you were advanced past MBT timing. A number of 1% of peak is what I hear in OEM circles for every 3-5 degrees plus or minus MBT. That's probably a smaller number than the resolution of any kind of commercial dynamometer. Things like ambient temp and pressure, altitude, gasoline octane etc. will always change MBT timing, which can of course be taken care of only by closed-loop control.
Thread
Thread Starter
Forum
Replies
Last Post
StratoBlue1109
Miata parts for sale/trade
21
09-30-2018 01:09 PM