(Moderator: You may delete the twin to this post that I mistakenly had 1st posted in C4 General Discussion, it's late (early actually...) and my brain is shutting down. Sorry for the double post)

I think I like my stock engine tuning better. With the Power Engine Tuning, it feels like it took away some low end torque. Less snappy off the line, but maybe (only maybe) better rolling kickdown. I got the unit sans instruction manual (without manual, for those not versed in Latin), so maybe I screwed up the upload? Here's the sequence of events:
I connect the unit, turn on the key. It communicates, ID's my VIN for 1995 Corvette LT1, then takes 7 minutes in a do not disturb mode, probably downloading my stock programming into it and uploading the power program into my ECM. Then it tells me Power Programming installed, turn key off and wait 10 seconds. It powers itself off after 10 seconds. Well, at this point I was not sure if it actually tuned my ECM or not so I turned the key back on and powered the Hypertech back up. During this run I get the Y or N series of questions about do I want power tuning Y or keep stock tuning N, etc.etc., including shift points, shift firmness, all the things Hypertech can change. Only thing I give a Y to is power tuning, rest I leave stock. It then asks me if I want to prgram the new setting and I say Y (yes) and it takes a 4 minute countdown and then does the 10 second power down of the unit.

I figure that it's finished and I take the car out for a drive. Mind you the car had been run within the hour testing the new set of stocker AC 41-906 plugs I put in today (took out my NGK's) and the car ran like a dream, very responsive and torquey (hey, my ASR unit really DOES work after all!). Well, the test run after the hypertech power tuning felt all different. The torquey off the line response felt diminished. It kicks down pretty good and pulls hard in WOT after the kick down, but I liked the that torquey feeling off the line and that seems lessened after Hypertech power tuning.

Should I have just left it after the first communication session and not gone into the Y or N menu session?

Oh yeah, running 93 octane premium of course...

Saturday (hey, that's later today...) is supposed to be mixed bag of rain, sleet, snow showers here so I won't be able to reload my stock tuning and try that out again for confirmation until maybe Sunday.

'95 LT1 convertible, A4, 2.59




[Modified by 95_C4_convertible, 3:23 AM 3/2/2002]

 

I borrowed a HyperTech PP from a friend who was doing some work on his car for a while and found that it made no difference in performance on my LT4, the G-Tech and my SOTP meters both concurred on this. The only thing that I used it for was the fan setup and to adjust for the 4:10 gears I installed in the rear.

 

A couple years ago, one of the car magazines took 4 cars and bought aftermarket chips and ran the cars at a track several times with the factory chip and then several times with the after chip. Every car did poorer with the aftermarkets except one which had the same performance as the stock chip. A friend who works on Vettes only at a GM dealer tells me that when he gets driveability complaints and the owner admits to an aftermarket chip, a 100% fix is to install the factory chip. It continues to amuse me that some dufus thinks they can tune a car better than the people who designed it and have Phd's and sophisticated test equipment and extreme funds, and more time. Even funnier is the other dufus that believes the advertising hype that the aftermarket chip claims. Theres a sucker born every minute.

 

Well, when you first said that you were thinking about buying it, I told you not to, and to get an Ed Wright Chip. I have a hypertech (came w/ car), and I tried to tell ya dont get it :yesnod:

Now, PLEASE listen to this also, when you said you were gonna get a hypertech, you also said you were gonna get an airfoil. PLEASE DON'T GET THAT EITHER, IT DOES NOTHING!

Ask about the performance on this forum before you buy things :D

Andy

 

I was not impressed by the Hypertech either. I only own one for the cooling fan change. Check here http://pages.prodigy.net/mstark/dyno_95vette.html to see dyno results.

 

Then you're probably still in the wrong Forum...

Most of us dullards aren't conversant in English even...