drag racing a 1990 ZR-1
 

Well I broke some parts on the Zr-1 this past weekend at Orlando Speed
World. I'am going to replace a few parts. I need a rear spring, half shaft ,
Dana 44 rear differential cover and maybe the rear differential itself. Won't
know unil I get the car on a lift. What Spring came on the ZR-1, I found a FE1
spring will that work?
I need to go and check the build Sheet for more information.
I'll update as I get parts and get to work
John

Re: drag racing a 1990 ZR-1
 

I did some research and found my build sheet . The rear spring is NYR, but I
can't verify it until i get the car on a lift and take it apart. It also shows FE7
H.D. F&R Susp. Would NYR also meen FE1 rear spring?
John

Re: drag racing a 1990 ZR-1
 

How did you break these parts? Is your motor modified? Were you on slicks?

Re: drag racing a 1990 ZR-1
 

Have been doing this since 2009, have not broken anything up to this
weekend.
Specs 1990 ZR-1 motor dune by South Georgia Corvette. 368 cu in stage 1
cams, secondary delete makes 525 at crank and 418 to the rear wheels.
I leave at 2500 rpm, shifts at 6500 each gear. 4l8OE controlled by comushift
Sport. Custom air feed thru front bumper into sealed stock air box with K&N
filter. Running M/T 315/35/17 drag radials on stock Zr-1 rear rims at 16 lbs.

Mileage 148xxx miles
John

Re: drag racing a 1990 ZR-1
 

Be sure to get the heavy wall aluminum half shafts that came that came with later C4s.

Re: drag racing a 1990 ZR-1
 

What were your best ETs and trap speeds?

Re: drag racing a 1990 ZR-1
 

At Orlando Speed World in Jan. 2017 it went the best of 11.54@120.00.
Avg 60ft time of 1.600 to 1.680 1/4 mile.When the half shaft broke I was deep
staging So before the run that I broke the rear my 60 time was 1.780 @
112.00 1/4 mile. I have made over 10 runs a year for the last 14 years.
John

Re: drag racing a 1990 ZR-1
 

Ok, So far I have ordered the follwing items.
rear spring FE1,rear differenital cover, (2) rear spring center mounts, (2)
reconditioned half shafts with 1350 u-joints. While I have everthing apart
I'am going to replace all rear the bushings, opinions ( use original OEM or
Superpro ?) on a 35 year old car. I need to get car on lift and check the rear
differential, as It was leaking at the bottom. If cracked mavbe able to repair
or just replace the entire rear with new gears ( 3:73).
New rear bushings still have to be ordered.
Thanks
John