Forum: C4 ZR-1 Technical Postings
01-13-2017
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Replies: 8
Views: 1,048
Re: Alignment
Whatever you do with your alignment, don't just go to a chain and get the factory specs. Get to a shop that will work to your specs and try the VB&P spec whose description best matches your need.
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Forum: C4 ZR-1 Technical Postings
12-05-2016
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Replies: 9
Views: 2,196
Re: Suspension Upgrade
My experience on springs/shocks - Our first steps on ours (street and autocross) (after alignment) was to reduce rear bar to get some of the oversteer tamed. That and the quick rack, but we found we...
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Forum: C4 ZR-1 Technical Postings
11-30-2016
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Replies: 13
Views: 2,240
Re: Suspension refresh
Yessir. Down by the steering rack. It's probably housed in a finicky plastic shroud if memory serves.
Cheers,
- Jeff
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Forum: C4 ZR-1 Technical Postings
11-28-2016
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Replies: 13
Views: 2,240
Re: Suspension refresh
For vague steering, if suspension components pass the shake test then check your rag joint. I found mine to be loose at one point, then I replaced it with the hockey puck style (from a z51 car) -...
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Forum: C4 ZR-1 Technical Postings
11-23-2016
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Replies: 35
Views: 9,328
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Forum: C4 ZR-1 Technical Postings
10-13-2016
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Replies: 17
Views: 3,075
Re: Steering rack
Inner tie rods can usually be changed in-the-car no problem with the correct tool, which is admittedly not in many home tool boxes. You need a guy with the 6' high and 10' long Snap-On chest to find...
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Forum: C4 ZR-1 Technical Postings
10-13-2016
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Replies: 16
Views: 3,334
Re: Sticking Brakes
An infrared pyrometer or even a careful wave of the hand near each wheel might narrow your search 75%.
I agree about the booster comments but that doesn't cover the "won't roll back until cooled"...
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Forum: C4 ZR-1 Technical Postings
09-27-2016
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Replies: 44
Views: 5,636
Re: Michelin PS2 335/35/17 back in production
Hey! Glad I can get back here sometimes.
Been busy racing my friends' sawzalled Mustang while I get the Z back together. If I could only figure out how to keep these Penskes compressed without...
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Forum: C4 ZR-1 Technical Postings
09-26-2016
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Replies: 44
Views: 5,636
Re: Michelin PS2 335/35/17 back in production
I seem to recall the Toyo R1R was better shaved, it is still favored in some sizes where the others aren't available. It's now been long enough since I used street rubber that I forget LOL!
Best,...
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Forum: C4 ZR-1 Technical Postings
09-26-2016
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Replies: 23
Views: 5,681
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Forum: C4 ZR-1 Technical Postings
09-26-2016
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Replies: 44
Views: 5,636
Re: Michelin PS2 335/35/17 back in production
Shaving tread to 1/2 depth has been common practice for some tires in the more serious autocross realm for decades. Reduces tread squirm and resulting heat buildup. Also cures the "first 200 miles"...
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Forum: C4 ZR-1 General Postings
06-23-2016
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Replies: 7
Views: 1,267
Re: 12" wheel up front?
I run 11's in front, either clone A-molds or CCWs, with 315s on a somewhat lowered car. I get slight rubs on the wheel well and (big) sway bar at full lock but that's running Hoosier DOTs which are...
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Forum: C4 ZR-1 Technical Postings
04-04-2016
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Replies: 20
Views: 3,609
Re: Tire size question
My 335/17's are on 12" CCWs and I do get slight slight rubs that point to needing maybe 0.031" more than my current spacers (I think they're 0.625?).
On the 9.5" fronts I have run 295's with no...
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Forum: C4 ZR-1 Technical Postings
03-25-2016
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Replies: 4
Views: 688
Re: Stock front brake rotors
Corvette Central has L and R 13" rotors at $80 ea. I thought I recalled them having NOS ones pretty cheap, I am not sure these are those.
This link is for Left:...
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Forum: C4 ZR-1 General Postings
03-25-2016
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Replies: 13
Views: 2,175
Re: 30 Front Sway Bar
Didn't see this until now, I don't get to the forum (and particularly this sub-forum) much. FWIW and this was a while ago...
On stock springs and bars our car was crazy loose even with proper...
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Forum: C4 ZR-1 Technical Postings
03-25-2016
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Replies: 15
Views: 4,189
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Forum: C4 ZR-1 Technical Postings
03-25-2016
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Replies: 15
Views: 4,189
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Forum: C4 ZR-1 Technical Postings
03-22-2016
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Replies: 15
Views: 4,189
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Forum: C4 ZR-1 Technical Postings
02-10-2016
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Replies: 32
Views: 7,600
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Forum: C4 ZR-1 General Postings
01-19-2016
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Replies: 11
Views: 1,591
Re: Track Day Brake Pads
For best results the ticket is to swap pads and rotors as sets. Pads transfer material to the rotor surface (search bedding) and this is the friction mechanism.
HTH/GL,
- Jeff
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Forum: C4 ZR-1 Technical Postings
01-13-2016
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Replies: 14
Views: 2,086
Re: Prothane bushing brackets
FWIW I've gone through a few aftermarket front bars and simply re-used the factory bracket.
I found I had to go smaller in the rear and larger in the front.
PS when installing make sure the bar...
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Forum: C4 ZR-1 Technical Postings
12-07-2015
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Replies: 2
Views: 901
Re: Rack and pinion..again
I took a quick look at your prior posts, went back near a year and didn't see anything about steering noises. I highly suggest getting a trained eye on your noises before spending any money on fixes...
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Forum: C4 ZR-1 Technical Postings
12-03-2015
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Replies: 24
Views: 4,797
Re: Guldstrand suspension
Hi Russ, y'know I thought of that but they appeared to sell them as pairs. Actually that was one thing I was looking to confirm when I found they were gone.
Especially since they looked like...
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Forum: C4 ZR-1s and ZR-1 Parts For Sale/Wanted
12-02-2015
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Replies: 24
Views: 6,307
Re: WTB an ECM
In event of failure this has been my plan for a while, glad to hear they've got something cooked up.
Recently learned that one somewhat common failure modes on other GM ECMs of this era revolves a...
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Forum: C4 ZR-1 Technical Postings
12-02-2015
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Replies: 24
Views: 4,797
Re: Guldstrand suspension
I waited too long gagging on the price (ok, saving for them) for the Guldstrand adjustable sway bar end links. Finally got ready, went to buy, POOF site and he are gone.
I have a bit of a preload...
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