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03-21-2019, 07:22 PM
Replies: 24
Views: 638
Posted By MatthewMiller

According to all info I've ever seen, the 16x9.5...

According to all info I've ever seen, the 16x9.5 wheel from 1985 had 38mm offset, and all the different 17x9.5 wheels from 88-96 had 56mm offset. So the difference is 18mm, which is the spacer width...
03-21-2019, 09:46 AM
Replies: 21
Views: 869
Posted By MatthewMiller

I don't believe the whole frame flex story on the...

I don't believe the whole frame flex story on the C8 either. In 2018, engineers have every available tool at their disposal and are heavily focused on high frame stiffness in any car they build. ...
03-21-2019, 09:33 AM
Replies: 3
Views: 179
Posted By MatthewMiller

Not sure what you mean by "front spindle yoke."...

Not sure what you mean by "front spindle yoke." Are you referring to #1 in the diagram below? That's called the "steering knuckle." If that's what you need, the best bet is to either look at eBay or...
03-21-2019, 09:23 AM
Replies: 8
Views: 694
Posted By MatthewMiller

So the original posts in this thread are almost...

So the original posts in this thread are almost two years old. But yeah, we can't machine rubber bushings, and we can't really give accurate dimensions of the OE bushings because they are bigger...
03-21-2019, 09:04 AM
Replies: 3
Views: 218
Posted By MatthewMiller

The PCMs from Y (Corvette), B, and F-body cars in...

The PCMs from Y (Corvette), B, and F-body cars in 94/95 all use the $EE definition file. So if I get a PCM from an F-body, you're saying the calibrations are close enough that it will run pretty...
03-21-2019, 08:50 AM
Replies: 24
Views: 638
Posted By MatthewMiller

You're missing the point of what adapters or...

You're missing the point of what adapters or spacers do. All C4s have the same bolt pattern - adapters don't change that. All that adapters or spacers do is move the wheel toward the outside edge...
03-20-2019, 10:50 PM
Replies: 3
Views: 218
Posted By MatthewMiller

Reprogramming computers from other cars for 94/95 C4s

I feel like I shouldn't have to ask this, but I want to be sure of something. I realize that in terms of hardware, any PCM from any 94/95 LT1-equipped GM car is the same as what came in a 94/95...
03-20-2019, 02:55 PM
Replies: 18
Views: 628
Posted By MatthewMiller

There aren't too many ways to define it. Does...

There aren't too many ways to define it. Does the wheel physically bolt on the correct way, without hitting anything at all points of suspension travel and steering input? If so, then it fits. ...
03-20-2019, 09:08 AM
Replies: 18
Views: 628
Posted By MatthewMiller

Agreed. I'm not calling them out, just noting...

Agreed. I'm not calling them out, just noting that these wheels may have more applications for C4 owners than they are saying.
03-20-2019, 08:58 AM
Replies: 24
Views: 638
Posted By MatthewMiller

I'm going to defer to WVZR-1 on this. I hadn't...

I'm going to defer to WVZR-1 on this. I hadn't considered the challenges of installing the studs on an early C4. When I've replaced mine, it's always with the bearing/hub off the car. It's not...
03-19-2019, 09:38 PM
Replies: 24
Views: 638
Posted By MatthewMiller

ARP makes wheel studs for "late model GM cars"...

ARP makes wheel studs for "late model GM cars" with M12x1.5 threads in several lengths: #100-7713 is 3.25" long, #100-7725 is 2.5" long, and #100-7726 is 2" long. You'd want at least 1" longer that...
03-19-2019, 09:21 PM
Replies: 18
Views: 628
Posted By MatthewMiller

FWIW, I disagree with their page that says it...

FWIW, I disagree with their page that says it won't fit a later 88-96 C4. They will just sit further out toward the edges of the fenders than the later C4s' stock 56mm offset wheels do. But they...
03-19-2019, 04:44 PM
Replies: 18
Views: 628
Posted By MatthewMiller

You can always use wheels with more offset than...

You can always use wheels with more offset than you need and add spacers to subtract offset. But when you say to "fill the wheel well a little more," that typically isn't done with taller tires. ...
03-18-2019, 11:10 PM
Replies: 3
Views: 275
Posted By MatthewMiller

I'm not sure how you're getting that those tire...

I'm not sure how you're getting that those tire sizes have the same dimensions as your original 255/50r16 tires. Those OE tires were 26.0" tall. The 255/40r18 is spot on at 26.0". The 255/40r17 is...
03-18-2019, 10:55 PM
Replies: 18
Views: 628
Posted By MatthewMiller

That rear tire is an inch too tall. It will...

That rear tire is an inch too tall. It will probably physically fit on the car, but it won't look right and it will handle worse due to a higher roll center. You'll also effectively numerically...
03-18-2019, 12:26 AM
Replies: 19
Views: 626
Posted By MatthewMiller

Is there a need to support the engine when you...

Is there a need to support the engine when you drop the trans? I didn't.
03-17-2019, 10:07 PM
Replies: 12
Views: 494
Posted By MatthewMiller

I don't see the BMF code on the published charts....

I don't see the BMF code on the published charts. However, according to at least one post on this forum...
03-16-2019, 04:18 PM
Replies: 9
Views: 456
Posted By MatthewMiller

If, and only if, the PO wants a different look,...

If, and only if, the PO wants a different look, then there are lots of 18s that will fit. You can fit anything up to an 18x11 et50 on all four corners of the car, with 315/30r18 tires. However,...
03-16-2019, 11:50 AM
Replies: 9
Views: 456
Posted By MatthewMiller

Given the OP's stated use of the car, which does...

Given the OP's stated use of the car, which does not include any type of racing, there is absolutely no need to spend money and time on bigger brakes. That's just silly. Ditto the wheel and tire...
03-16-2019, 11:47 AM
Replies: 24
Views: 638
Posted By MatthewMiller

Everything in this post is spot on. The only...

Everything in this post is spot on. The only thing I'd change is that instead of using a 3/4" adapter, I'd swap to longer ARP wheel studs and use 3/4" or 1" spacers instead. An adapter bolts to the...
03-13-2019, 05:21 PM
Replies: 15
Views: 529
Posted By MatthewMiller

Those will fit just fine.

Those will fit just fine.
03-13-2019, 12:26 PM
Replies: 12
Views: 494
Posted By MatthewMiller

For an 84, the front spring should have the code...

For an 84, the front spring should have the code "BMB" if it's a Z51, or "HMZ" if it's a base model. You would also be able to see the Z51 code on the RPO label if you can find that (the sticker...
03-13-2019, 10:14 AM
Replies: 4
Views: 239
Posted By MatthewMiller

It's relevant if those are the only offsets he...

It's relevant if those are the only offsets he can get in the wheels he wants to buy! But yes, as you and I both posted, the offsets mentioned will work just fine. I note that I got them backwards in...
03-13-2019, 10:07 AM
Replies: 12
Views: 494
Posted By MatthewMiller

According to the famous Hib Halverson chart, the...

According to the famous Hib Halverson chart, the 84 front spring on the base car was 363lb/in, and the Z51 spring was 583lb/in. In 1985, that base spring became the Z51 (stiff) option. So really,...
03-13-2019, 09:42 AM
Replies: 12
Views: 494
Posted By MatthewMiller

If the springs in your car look okay, with no...

If the springs in your car look okay, with no cracks or other obvious signs of wear, then they are probably functioning just fine. The 84 springs were the stiffest ever used on any C4 from the...
Showing results 1 to 25 of 497
 


 
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