Greenbeast

Hi all!!

I have the 427 cid twin turbo 900RWHP C5.
I has around 1050RWTQ and it's spinning all the gears!!

Because the big torque issue, I'm thinking to swap the 3.42 rear end to thhe 3.15 for less spining and better displacement!!

What advantages/disadvantages performance will confront?

Any suggestion and advise?

Comments pls!!

lucky131969

Spinning with what tires? Street tires? Drag radials at the strip?

jmoody66

Ive been in Brets 02 Z and it runs 911 rwhp and he had his stock rear wheels widened to a 12" setup and tubbed it...granted theres some wheelspin but for the most part it hooks up HARD.
Go the widening, tubbing and better tire route before spending all that money on a new built rear.

VGLNTE1

wont help much.....once its in the RPM's, its gonna spin regaurdless. Your best bet is to do what is stated above. You need better wider tires. Id do a MT 345 drag radial on a 12 inch wheel.

Greenbeast

I already has the rear tubbed and I have 12'' setup. The tires I'm using now are Pirelli Pzero 335/30 18"

I know that exist the drag radials, ect but just thinking to put a taller rear end and can take more advantage to the boost and power curve.

What do you think?

lucky131969

Must be tough for any street tire hooking up with that much torque, especially if you don't warm them up first. All in all, a good problem to have....

Greenbeast

Does the MT drag radial tires can be used for highway races and about 170+mph??

VGLNTE1

then that will work well. you will stay in the meat n taters of the boost longer. and 4th gear will be going to like 175 mph(ish)...that is if you have a MN6

VGLNTE1

you can check the speed rating...Ive had the BFG's and Nittos to 180+ many many many times...

I just recently had a BAD situation with the 305 MT's, but those were a new mold and their process failed. I separated the sidewalls, but I know the 345's have ben around for a while and many high speed people run them. With your power, I know you can do prob 210+...which Im sure they are NOT good for. Im sure you use your power way more from 70-170 than high speed crazy runs...

Greenbeast

you are absolutely right!!!

what about 3.15 rear end and MT drag radials??

VGLNTE1

only one way to find out

What tranny do you have?

Greenbeast

I have 6 speed tranny!

But it was upgraded for handle the 900RWHP car.

I changed the 6th overdrive for a shorter gear.

black98c5

There's your problem right there. there is no way those tires will hold the power you're making. They barely held my cars power when I had 400rwhp. I'd definitely go with some 345/35/18 M/T's. I run the 315/30/18 M/T's with 760rwhp and they hook pretty good and are stable at 140mph+ from what I've experienced. I get 1.5 60' at the track no problem with these tires as well. I'm not saying these will solve your traction issues completely, but they will definitely be a HUGE improvement over the Pzero's.

chevylad

How can you just realize you have traction problems with that much torque. Did you wake up one day and accidently put in a twin turbo 427? Maybe that will happen to me.

tail_lights

The Mickeys hook good I still think with that much TQ they will still spin at slower speeds but it should get you hooked up once you get up in the MPH. Lovin' those vids BTW if you have any more pm them to me

SVTBAIT

You could always opt for a taller tire. It would be essentially the same thing as a gear change, but you'd also get the added benefit of more sidewall.

RSchleder

I don't know too much about vette rear end strengths, however, do you have hardened half shafts? Can you put the hardened half shafts in a 315? Like I said, maybe stupid questions but I thought perhaps I'd just throw it out there

VGLNTE1

is it an MN6 or MN12?

I think a 3.15 will feel like a turd. I dont think with out tranny grears you should go below a 3.42

VGLNTE1

I had a hardened shaft....I twisted it after just 3 launches. there are some companies out there making crappy ones. Go to RPM and they will explain what to run. I run the new shaft (hardened) and have launched over 20 times now with no issue. Also, I think every vette needs a DTE brace

ajg1915

You could proabably drop down to 2.73 gears like "Smoove" (aka Jamie) did on his TT turbo vette.

He was happy with the results. Also try some sticky tures like RA1's or R888's by Toyo.