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.