ZR-1 Net Registry Forums  

Go Back   ZR-1 Net Registry Forums > C4 ZR-1 > C4 ZR-1 Technical Postings

Reply
 
Thread Tools Display Modes
Old 06-26-2009   #1
viperbaron
 
Join Date: Jun 2009
Location: Kabul, Afghanistan
Posts: 12
Default Lowering a '91 ZR1

What advantages are there to "lowering" a ZR1? Can it be done with the selective ride system? Should it be done? How can it be done? Just an inch or so.
With my '80, lowering the rear is easy with longer bolts, but the front coil springs are more problematic. I was wondering what it would take to lower my '91 ZR1?
viperbaron is offline   Reply With Quote
Old 06-26-2009   #2
jonszr1
 
jonszr1's Avatar
 
Join Date: Sep 2006
Location: lone pine and mammoth lakes
Posts: 1,407
Default Re: Lowering a '91 ZR1

lowering the rear is just like your 80 (longer bolts . the front howevert is more involved ,you must remove the front spring which is a pain and put on a different bumper . you can find the pieces in any of the corvettte catalogs .or switch to coilovers . to me the car is low enough , my 92 has coliovers which makes it 2 in lower and it scrapes on everything ,even ants jk
jonszr1 is offline   Reply With Quote
Old 06-26-2009   #3
Paul Workman
 
Paul Workman's Avatar
 
Join Date: Nov 2007
Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri
Posts: 6,493
Default Re: Lowering a '91 ZR1

Quote:
Originally Posted by jonszr1 View Post
lowering the rear is just like your 80 (longer bolts . the front howevert is more involved ,you must remove the front spring which is a pain and put on a different bumper . you can find the pieces in any of the corvettte catalogs .or switch to coilovers . to me the car is low enough , my 92 has coliovers which makes it 2 in lower and it scrapes on everything ,even ants jk


Mine is NOT lowered, and speed bumps anywhere are a certain drag! For the street, I wouldn't want to go lower. If I were tracking it...That might be a consideration...might be.

With regard to racing on a road course, I wonder what Jeffvette would have to say 'bout lowering the Z? (If anyone would have an expert opinion, he would, I recon.)

P.
__________________
Good carz, good food, good friendz = the best of timez!

90 #1202
"FBI" top end ported & relieved
Cam timing by "Pete the Greek"
Sans secondaries
Chip & dyno tuning by Haibeck Automotive
SW headers, X-pipe, MF muffs

Former Secretary, ZR-1 Net Registry
Paul Workman is offline   Reply With Quote
Old 06-26-2009   #4
GOLDCYLON
 
GOLDCYLON's Avatar
 
Join Date: May 2007
Location: Peoria, AZ
Posts: 9,155
Default Re: Lowering a '91 ZR1

Another vote for not lowering it. The car is low enough and the speedbumps in my neighborhood are a PITA no matter what the angle of attack. Especially if you are running a B&B fartcan resonator on the underside in the midline. I see zero benefit beyond maybe autocross and only with the additional modification to coilovers and other suspension mods. other than that its a personal preference. GM did a very good job in the configuration the car is already, JMO your mileage may vary.
__________________
GOLDCYLON - 91 ZR-1 #2014
GOLDCYLON - 90 ZR-1 #2794, 4L60e (Formerly Schrade's)

GOLDCYLON - 11 CTS-V


Arizona State Director




91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat

90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat

11 RED/GREY CTS-V

Last edited by GOLDCYLON; 06-26-2009 at 09:50 AM.
GOLDCYLON is offline   Reply With Quote
Old 06-26-2009   #5
XfireZ51
 
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,709
Default Re: Lowering a '91 ZR1

Quote:
Originally Posted by GOLDCYLON View Post
Another vote for not lowering it. The car is low enough and the speedbumps in my neighborhood are a PITA no matter what the angle of attack. Especially if you are running a B&B fartcan resonator on the underside in the midline. I see zero benefit beyond maybe autocross and only with the additional modification to coilovers and other suspension mods. other than that its a personal preference. GM did a very good job in the configuration the car is already, JMO your mileage may vary.
I'm concerned with same thing only with Magnaflow resonator which is fairly large.
XfireZ51 is offline   Reply With Quote
Old 06-26-2009   #6
Aurora40
 
Aurora40's Avatar
 
Join Date: May 2005
Location: Leesburg, VA
Posts: 2,713
Default Re: Lowering a '91 ZR1

I think the main advantage of lowering the car is the visual improvement. Dialing the rear down a little helps a lot in the looks department.
__________________
Bob Saveland
Former owner of #2517

[IMG]http://a.random-image.net/aurora40/vette.jpg[/img]
Aurora40 is offline   Reply With Quote
Old 06-26-2009   #7
XfireZ51
 
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,709
Default Re: Lowering a '91 ZR1

Any comment on what it might do for traction at the track?
In that same vein, anybody have a preference on FX3 settings for the drag strip?
XfireZ51 is offline   Reply With Quote
Old 06-27-2009   #8
jonszr1
 
jonszr1's Avatar
 
Join Date: Sep 2006
Location: lone pine and mammoth lakes
Posts: 1,407
Default Re: Lowering a '91 ZR1

on my blk car with the standard fx3 i get the best results in the middle setting .also disonnect the front sway bar .i remove the spare tire and fill the gas tank almost all the way full they help a bunch
jonszr1 is offline   Reply With Quote
Old 06-27-2009   #9
Kb7tif
 
Join Date: May 2009
Location: S Nevada
Posts: 352
Default Re: Lowering a '91 ZR1

Quote:
Originally Posted by viperbaron View Post
What advantages are there to "lowering" a ZR1? Can it be done with the selective ride system? Should it be done? How can it be done? Just an inch or so.
With my '80, lowering the rear is easy with longer bolts, but the front coil springs are more problematic. I was wondering what it would take to lower my '91 ZR1?
Also keep in mind when you lower the rear with the longer bolts what you would be doing is taking tension off the leaf spring mainly, that would give you some lowering effect. this also softens the spring tension and causes a soft bouncy ride..... The Z has soft enough springs already.
And will need to realign.
__________________
1995 Convertible Supercharged Auto
1974 454 550hp (avatar car) On the blocks- -Scharger install !
1992-Zr-1 Sold.
Watson Headers
Ported Plenum, Housings
Random tech cats
Fidanza Flywheel
Chipped, Relocated Mat
Woods 165 stat
Borlas, Straights
1996 Lt4 Sold
1994 Lt1 Sold
2004 Z06 Sold
AKA** Illenema
Kb7tif is offline   Reply With Quote
Old 06-27-2009   #10
Aurora40
 
Aurora40's Avatar
 
Join Date: May 2005
Location: Leesburg, VA
Posts: 2,713
Default Re: Lowering a '91 ZR1

Springs don't work that way. The spring is pushing the car up with the same force as before, which is exactly the force required to counteract gravity. In order to provide that force, it will be as tensed as before. You are simply changing the mounting point, which changes the ride height.
__________________
Bob Saveland
Former owner of #2517

[IMG]http://a.random-image.net/aurora40/vette.jpg[/img]
Aurora40 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 03:08 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright ZR-1 Net Registry 2020