Quote:
Originally Posted by MikeOD
I think your dyno is a heart breaker for numbers and your Cobra was making more than 430...most pullied/tuned/headered Terminators put down high 400's, and most of them that are running real well with those mods are mid-high 11's around the 120mph trap speed...sometimes you see the trailer queen that "made 505" or 515...and never races...and most likely would trap lower and not ET well either.
Here's exactly what the stock ZL1 tune does for spark correction based on intake air temp, cylinder air mass, coolant temp, and RPM. What you'll see from the coolant temp table, is around the temp where the thermostat would keep the car on the highway (194ish) the multiplier is 1 to 0.90 at 212...so as your coolant comes up over 200, it will actually pull LESS timing due to elevated IAT. At 86 degrees intake air temp you'll see the multiplier would say to pull no timing at all, at any RPM, and progressively more and more as IAT climbs, and then the air mass table is the general lookup table for air mass versus IAT that those 2 multipliers are affecting....so you lookup the general number, then multiply it by the coolant temp correction, then make note of your RPM AND IAT, and multiply it by the other table. Get it?
Don't move the IAT sensor to the airbox blindly...then the data is lying to the computer and the knock sensors will have to cover for it...do everything you can to help the intercooler/heat exchanger keep the IAT down low near 86 I know a lot of Cobra guys run ice water tanks for their heat exchangers to do just that. After you've done that, you could probably make the lookup table less agressive as you tune, paying careful attention to AFR, injector duty cycle, and knock...if you can make it less agressive (pulling less spark) without making the knock sensors unhappy, then the car should be able to go faster...if you can't, then you're probably getting all you can out of it already.
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Thank you so much, don't understand it all but the bottom line seems to be for max power keep the IAT low near 86!
That's exactly why I am considering the active interhiller that TREKGTO offers, seems to me that having 100% available power in any weather is the most effective mod, doesn't void warranty, and is especially effective in louisiana. I would much appreciate your opinion on this!!
Thanks again!
T