ZR-1 Mystery Key/Top Speed???

YllwVetteC5 · 09-15-2001, 11:30 PM

I heard many different rumors about the key in the ZR-1's that is located below the radio. I was wondering if someone could tell me what this does and how it works. Also, does anyone know what the actual top speed is of a stock ZR-1.

Avi · 09-16-2001, 01:07 PM

The key does the following...
(Keep in mind the LT-5 has 16 intake ports)

1) Turns off the highend injectors (LT-5's have 16 Fuel injectors, 8 for the primaries, and 8 for secondaries)

2) Turns off the vacuum secondaries

Net result is about 225hp (+/-) vs the full blown 375 (or 405 depending on year) - It reacts as though the car is an L-98 - About the same performance with the key off.

The difference in the drivers seat is huge... The engine doesn't want to tach much more then 4,500 - It just runs out of breathing.

ZR1991 · 09-16-2001, 01:21 PM

What he said.

It's called a "valet key" for obvious reasons.

Regards,

Clemson ZR-1 · 09-16-2001, 01:45 PM

Just to add a little. The key also cuts on the second fuel pump.

Top speed varies from high in the 170's to mid 180's mph.

454Big · 09-20-2001, 06:06 PM

Hmm, I´m trying to get my hands on a tuned ZR-1 here in Germany.
Was a Test Car for GEIGER Performance Engineering in Munich.
They even developed a Blower for the ZR-1 engine!!! More than 600 RWHP!!!
The car I´m interested in was a test-vehicle for GEIGER and the Chief mechanic.
It is reported that it is capable of doing 195+ mph!!! :reddevil :reddevil :reddevil
Only problem is that I will have to sell my C3 Big Block for the ZR-1........
Its still a mental confusion..........