87L98Z52

Ok,made up my mind and bit the bullet on wheels and tires.
Went with the c6 z06 wheels in black,all 4 are 19x11 with 64mm offsets.
Tires i went with the nitto invo,all 4 are 325/30-19
On an 11" wheel,tires are 12.6" wide and have a height of 26.7".
Ill confirm spacers/adapters when everything gets here before i order them but according to my math and going by the 17x11 wheels i have now with 36mm offsets,ill need about a 28mm(1 1/8") adapter for rear and about a 16mm(5/8") for front to sit the wheels and tires where i want them.
Ordered everything from Jason at http://www.corvette-wheels.com/

oldalaskaman

Something you may need to consider with those offsets, is that your vette is an early year version. spacing the inner mounting surfaces out so your rims will clear the inside of the wheel well also moves the outer rim ....out. Fender flares may be in your future

87L98Z52

No fender flares needed,i already took all that into account.i have 17x11 wheels mounted now with the early 36mm offsets. The spacers/adapter sizes i listed above wld put the new wheels rite where my current ones are for the rear and 1/2" in further then where the 36 mm 17x11 fronts are now because they out a little to far. Ill wait to confirm when wheels get here

Kubs

Your math looks good. The fronts may rub the inside when turned all the way, but that should be the only issue I see. Those tires are also a bit tall, and may rub under the hood on big bumps, but everything should fit under the fenders like you hoped.

87L98Z52

Thanks man! I got the idea of the 17x11 wheels from you a while back.
Yea these tires are about 3/4" taller then stock which shld only be half that (3/8") more into wheel well so i think ill be fine.My car rite now has huge gaps over the wheels,i actually plan on doin coil overs to lower the car down some and close the gaps.Im gonna use some stiff springs as well because i plan on doing some autox and road coarses.

While i have you here,im sure you use some good brake fluid since you race as well.Can you tell me how you changed to the good fluid the first time and bleed the whole system including abs? Im gonna put in some good brake fluid (motul or castrol) and want to make sure i get all old fluid out including in abs system.Im thinking i need to cyle abs somehow while bleeding.

Kubs

This is the brake fluid I use:
https://www.amsoil.com/shop/by-produ...-EA?zo=1934716

It is a high temp fluid that is designed for racing applications. I use it in both the clutch and brake systems. Dry boiling point is 580 degrees and wet boiling point is 410. The wet boiling point is more important because as soon as you open the bottle it starts absorbing moisture. A lot of "high performance" fluid has a good dry boiling point but the wet is almost half. Other fluids like Motul may have slightly higher temps, but cost an arm and a leg.

To flush the system open all the bleed screws and let the system gravity bleed. While that is going on, suck as much of the old fluid out of the reservoir as possible (I use a turkey baster). When the reservoir is empty clean it out as best as you can. If the fluid hasnt been changed in awhile there will be some gunk and dirt on the bottom. When it is all clean fill the system with the good fluid and bleed every corner until there are no bubbles. Once the system is fully bled, go around and bleed all the corners again (filling the reservoir as needed) just to make sure you have the new fluid everywhere. It should work its way through the ABS as you bleed normally.

87L98Z52

Thanks for the info KUBS!!

Im gonna mix my suspensin upgrades in this thread instead of start a new one.
Im taking everything apart to do brakes this weekend and ill post pics and while im at it im gonna do some susp upgrades.
Im starting with the front suspension.
I ordered new upper and loower moog ball joints and new upper and lower control arm bushings.
I went with the global west del-lum bushngs for a-arms to free them up.i have used these on my trans am and they work great,much better then rubber or poly!


Also going to do a coil over kit for the bilstein shocks.I ordered new bilstein sport shocks from summit and ordered this coil over sleeve kit from a1 racing products.Ill have the groove machined in the shock for snap ring when everything gets here.For springs i ordered 10" ,1 7/8" i.d hyperco 475lb rate springs.

Sleazy Rider

I have been following this and the other thread going for the last couple
of weeks, and met Paul from Van Steel yesterday at Houston's
Chevy/Corvette expo. They are now a distributor for the Street shop rear brake adapter. We pulled up a chair and talked about the C4's lack of braking and suspension for quite a while as the show was going on and they seem to have the solution for my brake/spring/shock ( coilovers ) need/want. Very friendly and knowledgeable, will be doing business with them.

88BlackZ-51

are you doing the C6 Z06 brakes for looks or for performance? i was in a C5 with upgraded pads and rotor, and it stopped amazing.

maybe these are far superior then the C5 brakes? never hauled down a C6 Z06.

brakes do look awesome!!

88BlackZ-51

ok thanks. i bit rich for my 88 car.

1991Z07

Let's just say that the Corvette engineers did NOT take a step backwards in the brake department when they designed the C6Z06...

I've ridden in one with aftermarket slotted rotors and single-piece performance pads (instead of the "padlets"), and it was amazing

87L98Z52

I guess im doing it for both.Im gonna do local autox here on long island and a cpl road coarse days a year with family and there new z06's.We have to travel off long island to do that because the damn liberals dont allow any tracks to be built here!! so road coarse racing will not be too often.Otherwise its just for looks,have something different,and because its a cool project!
I have a warhawk ls7 going in to but to early to post pics!

My family was not to impressed with the c6 z06 brakes at first,still they thought it was better then the c5 brakes, but after putting in good pads and changing to high temp brake fluid the brakes are amazing!!

Nathan Plemons

Looks like a nice kit. Just how big are the brakes, IE how much wheel clearance do you need? I'm running 17" C5 ZO6 wheels and would love to see that brake upgrade, are the rotors / calipers so big they wouldn't even fit inside my 17's?

87L98Z52

Yea you need 18's to clear these brakes.I had 17" zr1 replicas and they wld not have worked.

Nathan Plemons

Well that kinda sucks, I love my wheels. Oh well, I'm not gonna be able to afford a brake upgrade any time soon anyway. I don't drive my car terribly hard, I may just look into upgrading to the "heavy duty" brake upgrade. That's like the ONE option the original owner didn't get. For some reason I just never really like the look of the c5 upgrade.

87L98Z52

Most of my frontend pieces came,im getting real excited to get this going and drive the car again!!! Just waiting on coilover springs which will be here tomarrow.
And i dropped the bare Warhawk LS7 heads off to get done for the ls7.
Starting to fall in love with this old C4 again like i did when i bought it 15 years ago the year i grad H.S! LOL

87L98Z52

Thought i post a little video also on why im going with the global west del-lum control arm bushings rather then rubber.Now i know these rubber ones are 25 years old but you get the point.Ill post a video to show how much more free the a-arms move with the global west bushings when i get them on.

Just click to play!

Pwnage1337

Any update on this?

Curious about how the 325/30/19 looks on the back. I just ordered new wheels, Forgestar CF5's with 36mm offsets.

Its either 325 or 305 for the tire I want to run, I don't have flares and i'm worried about them sticking out and poking, looking like ****. My car is also an early car (85). I want the 325 cause girls love low cars with wide tires, and the 325 would net me a little more sidewall height for a little softer ride

Excellent work with the brakes btw!! Would like to do it with my own car at some point.


Jeremy

dizwiz24

Tom400CFI

...And the ability to absorb heat. Which you do want that if you track your car. It's not ALL about weight, Diz.