So the other day i picked up a quarterhorse (for tuning stock ecu's) for dirt cheap and i took my kick panel off to get to the ecu and i see 20 stickers stuck to the side of it. I get it out and it says "auto computer exchange" on it and that any tampering will void the warranty. Personally i could care less about the warranty but i found this other weird sticker that said "Trying to program this unit will cause an internal failure code. This unit is programmed with your vin# and part# and the latest software. Any tampering with suck programming will null and void your warranty. This unit is not for test proposes." My first reaction was it was false and they didn't really have that sort of ability, but then I couldn't help but feel they really messed this ecu up with there "re-manufacturing" job. I looked up "auto computer exchange" on google and they have a plethora of 1 star reviews saying there an absolute garbage company. Can I, or even should I use my quarterhorse on this thing?
Tuning Remanufactured EEC
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The QH should not cause problems. If it does, something was wrong to begin with. I had trouble locating a ECM but I finally found one at Summit racing and it is on back-order for 2 more days.
What are you trying to tune anyways? Injectors/MAF?
What are you trying to tune anyways? Injectors/MAF?
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I have a QuarterHorse and I really think that they are for forced induction or serious mods! If you are running 24#, I would just get matching injectors/maf.
That's what i figured. Even if they could, the vin wouldn't be right anyway since it came out of a gt convertible and is now in my 5.0 swapped coupe.
Im tuning a 306 with 24lb injectors & 75mm maf. Mainly for now im going to to do a base tune and turn the factory rev limit off and use the msd instead.
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If your injectors and MAF are matching, there is not much that a tune could do for you. I learned the hard way... I talked to Clint @ Moates and he said that the QuarterHorse is for tuning/data logging and the JayBird is for holding the tune long term. The QH will lose the tune if the battery is unplugged, the JayBird will not. I dont know how often you unhook your battery, but it can get unpleasant at times.
Check out EEC Tuning if you really want to get into it...
http://eectuning.org/forums/
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You guys are on the right track, sort of. The Jaybird is actually the programmer that allows you to flash F3 chips, which would be the long term, more permanent solution. There's lots you can tune to improve the performance and efficiency of a 5.0L, even if it's mainly stock. You can adjust cam timing, spark tables, control e-fans and A/C, turn of emissions equipment, etc. While it's true that you'll be able to leverage your newfound tuning ability more with a heavily modified combo, it should be understood that the stock calibration of the EEC-IV was a compromise to suit a wide range of cars adequately, not precisely.
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The quarterhorse can lose its tune but only if the battery in the quarterhorse itself is dead. Another thing with a tuner you can also fine tune fuel delivery using the maf transfer and changing the airflow amounts at voltage outputs from it that are rich or lean. I got the idle smoothed right out on my car to the point it sounds stock. I did this by getting it more timing at idle and adjusting the flow reading in the maf transfer. Heck you can get a stocker to idle better and even pick up 15 to 20 horsepower just by timing and fuel adjustments in the tune.
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