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Old 09-16-2001, 12:30 AM   #1
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Member Since: Sep 2001
Location: Hummelstown PA
Default ZR-1 Mystery Key/Top Speed???

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.
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Old 09-16-2001, 02:07 PM   #2
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Location: Alabaster, AL, USA
Default Re: ZR-1 Mystery Key/Top Speed??? (YllwVetteC5)

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.
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Old 09-16-2001, 02:21 PM   #3
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Default Re: ZR-1 Mystery Key/Top Speed??? (Avi)

What he said.

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

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Old 09-16-2001, 02:45 PM   #4
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Default Re: ZR-1 Mystery Key/Top Speed??? (YllwVetteC5)

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.
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Old 09-20-2001, 07:06 PM   #5
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Default Re: ZR-1 Mystery Key/Top Speed??? (YllwVetteC5)

Hmm, Im 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 Im 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..........
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Old 09-20-2001, 07:06 PM
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