Tuner question
#1
Tuner question
Helping my kid with a budget Tahoe build a iron 5.3 to 5.7, Long question short,with approx 10.8 compression can this be tuned to run decent on mid grade or regular? We are about to bolt the heads on and having second thought,I fueled up my L86 the other day,premium was $5.75gal =$120 probably more 3 day later.
Hopefully its temporary and premium/gas become more reasonable.Thanks in advance
Hopefully its temporary and premium/gas become more reasonable.Thanks in advance
Last edited by gonzo 6.2; 10-10-2022 at 12:59 PM.
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Jakeallred (10-10-2022),
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#4
TECH Junkie
iirc you can do both since HPTuners has a low octane table and a high octane but I could be misremembering
#5
TECH Senior Member
iTrader: (2)
The calibrations have a high and low octane table but that is because it will always use the high octane table until there is a knock present, then it reverts to the low octane table that has less timing it. It also doesn't go to the exact value in the low octane table either, it use a knock learn factor that will interpolate between the 2 values to help bring knock away.
So if the high octane is running 20 degrees then the low octane is running 14 degrees of timing in the same cell and it starts to dip down to 50% knock learn factor, it will run 17 degrees of timing. It will continue to run that 17 degrees of timing even with no knock until the knock learn factor starts to go back to 0%, it takes a little bit of time for the KLF to slow work it's way back and it will add in timing as it works it's way back towards zero. That's just a general idea of what it's doing.
He'd still require two different tunes with two different timing tables if you want to run 87/89 octane in one and 93 in the other if he really wanted to get everything out of the engine.
So if the high octane is running 20 degrees then the low octane is running 14 degrees of timing in the same cell and it starts to dip down to 50% knock learn factor, it will run 17 degrees of timing. It will continue to run that 17 degrees of timing even with no knock until the knock learn factor starts to go back to 0%, it takes a little bit of time for the KLF to slow work it's way back and it will add in timing as it works it's way back towards zero. That's just a general idea of what it's doing.
He'd still require two different tunes with two different timing tables if you want to run 87/89 octane in one and 93 in the other if he really wanted to get everything out of the engine.