Increase rear anti-roll when adding 17x11's?
Thread Starter
Racer
Joined: May 2002
Posts: 344
Likes: 0
From: Good Old USA
Increase rear anti-roll when adding 17x11's?
I'm stepping up to 17x11 rears (NOS A-mold) on my '96 LT4/Z51. Suspension charts indicate that RPO Z16 (GS's) received 26mm rear anti-roll bars, while all others received 24mm rear anti-roll bars. Is it recommended that I swap out my 24mm for a 26mm when I upgrade the wheels? What are the pros/cons? Though I'm no suspension guru, I thought that added meat to the rear would increase understeer, while stepping up the anti-roll diameter will increase understeer even more. Who's got the scoop?
:chevy
:chevy
Burning Brakes
Joined: Oct 2002
Posts: 1,152
Likes: 1
From: Wichita KS
Re: Increase rear anti-roll when adding 17x11's? (Midgetfist)
The larger/stiffer rear bar will create more oversteer...loose
A larger/stiffer front bar creates more understeer...push
Yes the larger tires/wheels in the rear create more understeer...push
With the extra grip of the larger surface area tires/wheels the factory opted to balance the suspension out by adding a larger rear bar...26mm
There is a lot more going on with spring rates Etc on the 96 model, the factory went way soft that last year. The trend overall is softer spring rates & larger roll bars & better shock rates.
FWIW, I run 17 X11's all around with 285's & 335's a 30mm front bar & a 26mm rear bar W/ base 1995 FE1 springs. Its all subjective with different spring rates and such but my car is stuck like glue & turn in is still excellent.
[Modified by superlund, 9:33 PM 7/15/2003]
A larger/stiffer front bar creates more understeer...push
Yes the larger tires/wheels in the rear create more understeer...push
With the extra grip of the larger surface area tires/wheels the factory opted to balance the suspension out by adding a larger rear bar...26mm
There is a lot more going on with spring rates Etc on the 96 model, the factory went way soft that last year. The trend overall is softer spring rates & larger roll bars & better shock rates.
FWIW, I run 17 X11's all around with 285's & 335's a 30mm front bar & a 26mm rear bar W/ base 1995 FE1 springs. Its all subjective with different spring rates and such but my car is stuck like glue & turn in is still excellent.
[Modified by superlund, 9:33 PM 7/15/2003]
Thread Starter
Racer
Joined: May 2002
Posts: 344
Likes: 0
From: Good Old USA
Re: Increase rear anti-roll when adding 17x11's? (superlund)
Thanx for the clarification superlund. :thumbs:
Caught your response before and after you modified it, and I must say - Great post-mod.
:chevy
Caught your response before and after you modified it, and I must say - Great post-mod.
:chevy
Burning Brakes
Joined: Jul 2002
Posts: 972
Likes: 0
From: Springdale AR
Re: Increase rear anti-roll when adding 17x11's? (superlund)
FWIW, I run 17 X11's all around with 285's & 335's a 30mm front bar & a 26mm rear bar W/ base 1995 FE1 springs. Its all subjective with different spring rates and such but my car is stuck like glue & turn in is still excellent.
Le Mans Master
Joined: Jan 2002
Posts: 9,036
Likes: 13
From: Edmonton AB
Re: Increase rear anti-roll when adding 17x11's? (superlund)
Here is one pic...
Fairly common to run 11" on the front, C4's will take
large wheels & tires up front without problems.
large wheels & tires up front without problems.
road condition for dual-purpose cars. For we unfortunates
who are condemed to coexist where lane ruts abound, 315s
on the front might be a wee bit large.
[Modified by Slalom4me, 12:24 AM 7/16/2003]
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Burning Brakes
Joined: Oct 2002
Posts: 1,152
Likes: 1
From: Wichita KS
Re: Increase rear anti-roll when adding 17x11's? (Slalom4me)
Well, they fit. But driving pleasure may be influenced by
road condition for dual-purpose cars. For we unfortunates
who are condemed to coexist where lane ruts abound, 315s
on the front might be a wee bit large.
road condition for dual-purpose cars. For we unfortunates
who are condemed to coexist where lane ruts abound, 315s
on the front might be a wee bit large.
BTW, nice ride NavyVet...both cars look good.
[Modified by superlund, 12:44 AM 7/16/2003]
Melting Slicks
Joined: Jan 2000
Posts: 3,418
Likes: 1
From: NW Chicago Suburbs
Re: Increase rear anti-roll when adding 17x11's? (Midgetfist)
I'm stepping up to 17x11 rears (NOS A-mold) on my '96 LT4/Z51...Who's got the scoop?
Conclusion: go with the 30mm/26mm solid swaybars, you'll love it. If you're not up for a swaybar mod, leave it until after you have some drive time, a little more push is considered safer, so you won't be taking any chancing with your safety, just gonna be bored :)
Eric
Le Mans Master
Joined: Oct 2000
Posts: 6,362
Likes: 30
From: Oak Harbor WA
Re: Increase rear anti-roll when adding 17x11's? (silver & red CE)
Yep, I drove my car for about a year with the 17x11 rear combo and it would push when I was driving faster than I really should have into a corner. Added the 30/26 bars and it is much better. I autoX mine, and it is my daily driver. Much improved both ways.
Drifting
Joined: Jul 2000
Posts: 1,661
Likes: 4
From: Phoenix, Arizona
Re: Increase rear anti-roll when adding 17x11's? (superlund)
Superlund - thanks a lot :flag I only run the 315s on the track - Kumhos or Hoosiers. When I drive on the street, I use 275/40x17s on a-mold 9.5s. With my alignment, it handles great, but tends to tramline a bit. I don't take my hands off the wheel when there are lane ruts or freeway grooves present :steering:
Burning Brakes
Joined: Jul 2002
Posts: 871
Likes: 0
From: Costa Mesa CA
Re: Increase rear anti-roll when adding 17x11's? (Midgetfist)
Yeah, nice combo superlund,
But personally, I'd have gone with the 315's in front on those wide wheels. More grip and should look better.
IMO,
BIG JIM
But personally, I'd have gone with the 315's in front on those wide wheels. More grip and should look better.
IMO,
BIG JIM
Le Mans Master
Joined: Sep 2000
Posts: 6,303
Likes: 714
From: Bartlett IL
Re: Increase rear anti-roll when adding 17x11's? (87Z-ya)
Anyone have experience when installing 17x11 315's on the rear of an 84 with Z51? I just did this upgrade using the AFS wheels with the 84 offset. Up front running 17x9.5 with 285 Yoko AVS tires. So far the rear feels "planted" on sweeping on-ramps.