I found a hypertech chip in a pcm and some other one (jet?) in another. I was surprised at just how little was changed. I sold them on ebay after reading the chips. I still have the bins somewhere on my laptop. One was for a tbi 4.3 V6 in a 7427 pcm($0D), the other was for a 5.7 tpi in a 7730 ecm ($8D).
79 Jeep Cherokee, AMC 401, T-18 manual trans, hydroboost, 16197427 MPFI system---the toy
93 Jeep YJ Wrangler, 4.0L, 5 speed, 8.8 rear, homebrew hub conversion and big brakes, hydroboost, 2.5in OME lift, 31x10.50's---the daily driver
99 Jeep WJ Grand Cherokee limited, 4.0L, auto, 2wd, leather and power everything, 99% stock---the long distance highway ride.
hypertech chips may be overpriced, but they do what they advertise within the limits of what they can do, since they can't tailor to a customer's individual car.
just because a test vehicle in good condition takes 5 more degrees of WOT timing happily and is 20% rich from the factory at 6k rpm, doesnt mean joe's bagged out 1986 iroc with 250,000 miles, a weak fuel pump, coked up cylinders, and clogged cats will play nice with those numbers.
that kind of person is a large part of their target market, and it's also why the factory tunes are a bit conservative to begin with.... gm would rather be far from the limit than risk the liability of blowing up some guys shitbox; and that's how hypertech feels as well.
if someone handed me the parameters of how many different vehicles these hypertech chips need to work on, and what would happen if we push too hard.. then asked me to design one, i bet my results would be equally dissapointing. and so would yours.
Thought I would go ahead and upload this to add it to the collective. This was found in a BJYL PCM out of a '94 Chevy C1500, 2WD. It's a $OD.
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