Perfect analogy!
1990 Z51 package
Racer
Joined: Oct 2006
Posts: 438
Likes: 14
From: Tucson/Santa Paula AZ/CA
2017 C4 of Year Finalist
what the book says about it is: "Z51 included RPO KC4 (engine cooler), heavy-duty front and rear springs, larger front brakes, and heavy-duty front and rear stabilizer bars. Available with manual transmission coupes only."
And this: http://www.buyavette.net/suspension%20packages.php
I understand the combination of Z51 and FX3 got the standard leaf springs NOT the heavy duty ones.
Mick
Last edited by QZRBLU; Sep 28, 2016 at 11:17 AM.
Safety Car
Joined: Nov 2009
Posts: 3,973
Likes: 341
From: Adelaide South Australia
'90 - 115.5/659 lbs front 57.2/326 lbs 30/26 rear
R9G 115.5/659 57.2/326 30/26
2 mm more in the rear bar from '89
FRONT 88-96
FHA 93.1
FHB 115.5
FHC 93.1
AA 96.2
FSK 90.1
FSM 75.4
FSS 90.1
FSR 73.2
HA 60
JA 60
REAR 84-96
BMF 72
BMH 87.5
NYU 57.2
NYR 39.9
RCA 39.9
RHY 39.9
RHZ 39.9
RR 26
R9G 115.5/659 57.2/326 30/26
2 mm more in the rear bar from '89
FRONT 88-96
FHA 93.1
FHB 115.5
FHC 93.1
AA 96.2
FSK 90.1
FSM 75.4
FSS 90.1
FSR 73.2
HA 60
JA 60
REAR 84-96
BMF 72
BMH 87.5
NYU 57.2
NYR 39.9
RCA 39.9
RHY 39.9
RHZ 39.9
RR 26
Safety Car
Joined: Sep 2010
Posts: 3,752
Likes: 190
From: Indiana PA
Yes the difference is very noticeable. Base is for the country club/boulevard cruiser type. Z51 is for those who like to drive there Corvettes...HARD!
Racer
Joined: Oct 2006
Posts: 438
Likes: 14
From: Tucson/Santa Paula AZ/CA
2017 C4 of Year Finalist
Thanks Sean!
'90 - 115.5/659 lbs front 57.2/326 lbs 30/26 rear
R9G 115.5/659 57.2/326 30/26
2 mm more in the rear bar from '89
FRONT 88-96
FHA 93.1
FHB 115.5
FHC 93.1
AA 96.2
FSK 90.1
FSM 75.4
FSS 90.1
FSR 73.2
HA 60
JA 60
REAR 84-96
BMF 72
BMH 87.5
NYU 57.2
NYR 39.9
RCA 39.9
RHY 39.9
RHZ 39.9
RR 26
R9G 115.5/659 57.2/326 30/26
2 mm more in the rear bar from '89
FRONT 88-96
FHA 93.1
FHB 115.5
FHC 93.1
AA 96.2
FSK 90.1
FSM 75.4
FSS 90.1
FSR 73.2
HA 60
JA 60
REAR 84-96
BMF 72
BMH 87.5
NYU 57.2
NYR 39.9
RCA 39.9
RHY 39.9
RHZ 39.9
RR 26
Race Director
Joined: Jan 2007
Posts: 14,948
Likes: 3,351
From: NYC NY
Instructor
Joined: Feb 2023
Posts: 151
Likes: 29
From: Florida spacecoast
Ressurectiing thread #2 thanks in advance for any help and advice.
ive been googling the threads and you tubing a lot to find my own answers but sometimes better clarification is needed (don't know options, codes, differences)
So i got this 90 w/ zf 6spd, kc4 oil cooler(adapter on filter pad w/ coolant hoses), fx3 shocks & No rpo sticker
First Q. shocks the attached link is asking with or without z51, and mentions 17 inch rims
this thread post 2, i think means it has the z51.
(believe fx3 inop & looking to replace w/ non fx3 shocks)
https://www.shockwarehouse.com/search?vendor/Bilstein
Q 2. Bigger brakes! If thats true than- 90, corvette, brakes, front, from the autoparts store are wrong and there was no option other than base and zr1
is there different front brakes.
I was going to start a service/maintenance/fix thread after the initial service, but maybe i should do it now and attach threads in that instead of ressurecting.
Swear to god i'm cramming like it it's finals week to save you guys from the dumb questions
thanks
ive been googling the threads and you tubing a lot to find my own answers but sometimes better clarification is needed (don't know options, codes, differences)
So i got this 90 w/ zf 6spd, kc4 oil cooler(adapter on filter pad w/ coolant hoses), fx3 shocks & No rpo sticker
First Q. shocks the attached link is asking with or without z51, and mentions 17 inch rims
this thread post 2, i think means it has the z51.
(believe fx3 inop & looking to replace w/ non fx3 shocks)
https://www.shockwarehouse.com/search?vendor/Bilstein
Q 2. Bigger brakes! If thats true than- 90, corvette, brakes, front, from the autoparts store are wrong and there was no option other than base and zr1
is there different front brakes.
I was going to start a service/maintenance/fix thread after the initial service, but maybe i should do it now and attach threads in that instead of ressurecting.
Swear to god i'm cramming like it it's finals week to save you guys from the dumb questions
thanks
Last edited by Supermutt; Mar 19, 2023 at 11:04 AM.
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Drifting
Joined: Feb 2017
Posts: 1,274
Likes: 399
From: Tacoma WA
2024 C4 of the Year Finalist - Unmodified
The J55 front brakes (bigger brakes) are 13 inch rotors rather than the base 12 inch rotors. They are also the ones on the ZR1 cars.
The Z51 cars had 17”x9.5” wheels at all four corners.
Measure the front sway bar and if it is 30mm you are a Z51 car.
Also the Z51 package included a quicker steering ratio.
The Z51 cars had 17”x9.5” wheels at all four corners.
Measure the front sway bar and if it is 30mm you are a Z51 car.
Also the Z51 package included a quicker steering ratio.
Instructor
Joined: Feb 2023
Posts: 151
Likes: 29
From: Florida spacecoast
Thank you, front sway bar measures 26mm, also found this chart when outside crawling under it, settles it for me but i'll measure again since it goes up in the air tomorrow for brakes, bearings and rims go to the shop for tires. Guess i better get the shocks ordered up.
thanks again
https://www.corvetteactioncenter.com...uspension.html
thanks again
https://www.corvetteactioncenter.com...uspension.html
Team Owner
Joined: Sep 2003
Posts: 25,394
Likes: 2,741
Ressurectiing thread #2 thanks in advance for any help and advice.
ive been googling the threads and you tubing a lot to find my own answers but sometimes better clarification is needed (don't know options, codes, differences)
So i got this 90 w/ zf 6spd, kc4 oil cooler(adapter on filter pad w/ coolant hoses), fx3 shocks & No rpo sticker
First Q. shocks the attached link is asking with or without z51, and mentions 17 inch rims
this thread post 2, i think means it has the z51.
(believe fx3 inop & looking to replace w/ non fx3 shocks)
https://www.shockwarehouse.com/search?vendor/Bilstein
Q 2. Bigger brakes! If thats true than- 90, corvette, brakes, front, from the autoparts store are wrong and there was no option other than base and zr1
is there different front brakes.
I was going to start a service/maintenance/fix thread after the initial service, but maybe i should do it now and attach threads in that instead of ressurecting.
Swear to god i'm cramming like it it's finals week to save you guys from the dumb questions
thanks
ive been googling the threads and you tubing a lot to find my own answers but sometimes better clarification is needed (don't know options, codes, differences)
So i got this 90 w/ zf 6spd, kc4 oil cooler(adapter on filter pad w/ coolant hoses), fx3 shocks & No rpo sticker
First Q. shocks the attached link is asking with or without z51, and mentions 17 inch rims
this thread post 2, i think means it has the z51.
(believe fx3 inop & looking to replace w/ non fx3 shocks)
https://www.shockwarehouse.com/search?vendor/Bilstein
Q 2. Bigger brakes! If thats true than- 90, corvette, brakes, front, from the autoparts store are wrong and there was no option other than base and zr1
is there different front brakes.
I was going to start a service/maintenance/fix thread after the initial service, but maybe i should do it now and attach threads in that instead of ressurecting.
Swear to god i'm cramming like it it's finals week to save you guys from the dumb questions
thanks
Pro
Joined: Jun 2008
Posts: 674
Likes: 235
From: Louisville Kentucky
2023 C4 of the Year Finalist - Unmodified
2022 C3 of the Year Finalist - Unmodified
2021 C4 of the Year - Unmodified Finalist
2018 C4 of Year Finalist
2015 C4 of the Year Finalist
The J55 front brakes (bigger brakes) are 13 inch rotors rather than the base 12 inch rotors. They are also the ones on the ZR1 cars.
The Z51 cars had 17”x9.5” wheels at all four corners.
Measure the front sway bar and if it is 30mm you are a Z51 car.
Also the Z51 package included a quicker steering ratio.
The Z51 cars had 17”x9.5” wheels at all four corners.
Measure the front sway bar and if it is 30mm you are a Z51 car.
Also the Z51 package included a quicker steering ratio.