I know it’s not 3rd gen related but my question is a 95 Z28 with a 6 speed manual all stock is it truly governed it has 150 mph speedo I never got a chance to actually test its limits but some of you may have just curious how can I remove this and should I change out my Driveshaft for safety I plan to track the car on time attack laps and things of that nature or can I just do any speed I want with no tune or anything like that thanks in advance

 

YES IIRC!
A PCM burn will fix you up!

 

Can I just go to any performance related shop and tell them to remove the governor and they will know what to do I’ll pay the cost I don’t care about that I don’t think it will be all that expensive anyway

 

Check the speed rating of the factory tires. On 3rd gens that came factory equipped with Z rated tires, they had no speed limiter. Otherwise they were governed to a lower speed then the speed rating of the factory tires (usually in the 110 - 112 MPH range). Note that this is true of most of the EFI cars. The carbed 3rd gens weren't limited in speed.

RBob.

 

It’s for a 4th gen Z28

 

My 95Z has a rev limiter and I just can't remember what the stock rev limit was set @ !!! You can adjust it with a Hypertech Power Programmer or some similar "programmer". Mine reached about 142 when it had 3.42's; I ran out of road and just never took it that high again. ( Might be willing to sell the Hypertech,................ I've already returned my Z to the STOCK config so the HPP is ready to use. )



AFAIK: The 95 Z had to have the best tires available from the factory in order to get the 150 speedo gauge.

 

Yes the limit was determined by what speed rating was on the original factory tire. I believe there were two choices the all season tire got you 110 I believe and the Z rated were 155 or 162. I had a 99 WS6 when they were new and I believe that car was set at 162 but speedometer stopped at 155. And believe me it would do it. Looking back now that I’m 20 years older can’t figure why I even did it. Lol. And to boot, 162 was in 6th gear with a cutoff at 3000 rpm. Curious what it would do at 6500 in sixth gear

 

Yes, I know. This is why I used the words I did in my response.

RBob.

 

You'd have never got there with the stock LS1. You would have reached a terminal speed where wind resistance would have kept you from going faster. Need more HP!

My 97 would run 150 but I never had an area to try to run any faster..

 

Ive been in excess of 150 in an 02 z28 SS. Stock at the time.

 

If you weren't I'd able to I'd be surprised. Stock LS f-bodies with no limiter should be able to reach past 165. I think I've seen 168mph quoted somewhere. The LS1 in birds was under-rated, internally it was the same as the 350hp LS1 in the vette. Only difference was intake and exhaust really.

I've never seen a true measured top speed from a stock L98 with no limiter, but my best guess is about 153-156mph. While they are only 30hp behind a LT1 the power band of a L98 falls off sharply compared to the LT1's power band. So that would contribute to the LT1 which is past 160mph.

The only Thirdgen I know of to have its top speed officially clocked is the TTA at 162mph, and that 162 was limited not by aerodynamic drag, but by the engine's rev limiter.


I took the GTA to what was based on engine speed and gear about 177 and it was NOT done. I ran out of RPM in 4th gear and went into 5th. The needle was still going when I watched it cross the 6000rpm mark. At 6000rpm in 5th gear with a M29 T56, 3.23 gears, and a 275/40 tire is 177.3mph. I just decided my ***** were not big enough to stay in it. With the power the car makes on the top end I would not be surprised if the top speed was around 190. When I built the car I did a whole bunch of math because I wanted enough power to break the 200mph barrier.

80-120mph is REALLY fun because thats a 3rd gear blast to redline that happens so fast.

 

It depends. I looked at a few bin files for lt1’s that i have and some are not limited, some are to 154