bigballinzx Posted May 1, 2007 Share Posted May 1, 2007 Looking for some help with one of the last quirks with my Z. Car runs great and is very strong I have a 1990 Z32 with a 94 LT1 T56 combo. Only problem is in 6th gear when the rpm's get up to 2.5k some kind of limiter is kicking in. No problems with any of the other gears. Any one every heard of anything like this? Quote Link to comment Share on other sites More sharing options...
Administrators BRAAP Posted May 2, 2007 Administrators Share Posted May 2, 2007 Are you using an OE GM ECU? Is it getting a vehicle speed signal from the tranny? Is it possible the speed signal that is being read by the ECU is now different than what it is used to seeing? i.e. the GM ECU has a preprogrammed a speed governor and if the speed input pulses from the speed sensor on the tranny reach a certain point, the ECU will engage the speed governor. Just a thought. Quote Link to comment Share on other sites More sharing options...
that240guy Posted May 3, 2007 Share Posted May 3, 2007 if the motor came out of a car that didn't have z rated tires, thats your speed governor. I had a 94 formula that came with h rated tires that cut out at 115 mph i think. So with the little tires that a z has, that would probably be around 90 mph or something like that. Get your computer tuned and have them max the governor out. I think you can set it to 255 with an obd1 lt1 computer. Quote Link to comment Share on other sites More sharing options...
bigballinzx Posted May 3, 2007 Author Share Posted May 3, 2007 Yea I was figuring something along those lines and considered purchasing the hypertec programmer but for now I am just going to send the ECU to have speed limiter maxed out and delete some other components. Thanks for the imput Quote Link to comment Share on other sites More sharing options...
Mike kZ Posted May 3, 2007 Share Posted May 3, 2007 How fast are you going at 2.5K?? At 80, I'm running around 1.7K with 3:73s Quote Link to comment Share on other sites More sharing options...
piston Posted May 6, 2007 Share Posted May 6, 2007 i crused at 60mph on 6th gear with 3.90 rear at 2,500rpm. i think my speedos off by a bit though. Quote Link to comment Share on other sites More sharing options...
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