Do you think the rear end will hold up?

1872 Views 26 Replies 9 Participants Last post by CTSV05, Jun 12, 2007

VCAT

Discussion Starter · Jun 8, 2007

I know there are some of you guys out there with superchargers and turbos that's why i posted this, will i have to put a new rear end in my V with a turbo putting 500 to 550 rwhp?

1 - 20 of 27 Posts

04CTSVFLA

· #2 · Jun 9, 2007

why may i ask are you going turbo if your going to limit it to 500-550!!! Unless your leaving the stock bottom end...understandable. I believe yes you SHOULD invest in a new rear.....however the enemy of our rears is low end torque...and with a turbo I believe your low end grunt wont be much stronger then stock.....So technically you should be ok getting an 06 diff/shaft setup...and a kars stage three, but it wont be bullet proof by any means.

Kmajecki

· #3 · Jun 9, 2007

Wha wha what?! 550RWHP?! Sign me up! jk I'm no expert on rears. This guy user name "parkers" has a 9" rear, i think he's in the 800hp range. I think he dropped several grand for it though. Just take it easy and save a couple grand...

VCAT

Discussion Starter · #4 · Jun 9, 2007

yeah i didn't want to have to dig into the engine too much but if i must i will, i still want to be able to drive my V on a regular basis and figured if i went with too much boost it would make my foot real heavy all the time. but i am just getting a feel for what some of you have had to deal with and then i wil decide, thanks. oh if you have more info on rear ends please fill me in.

VCAT

Discussion Starter · #5 · Jun 9, 2007

well i called about a kit and was told i would need to change my vale springs and injectors to get the most HP's to the rear wheels. with a 5 psi boost at 39 hp per 1 psi of boost, so figure mostly stock i'm running 320 rwhp at best then the turbo would put me to about 515 if finly tuned.

JimmyH

· #6 · Jun 9, 2007

04CTSVFLA said:
why may i ask are you going turbo if your going to limit it to 500-550!!! Unless your leaving the stock bottom end...understandable. I believe yes you SHOULD invest in a new rear.....however the enemy of our rears is low end torque...and with a turbo I believe your low end grunt wont be much stronger then stock.....So technically you should be ok getting an 06 diff/shaft setup...and a kars stage three, but it wont be bullet proof by any means.

I dont think torque (at least the stock 400) is the enemy of the diff, I think it is the excessive wheel hop some indulge in and all the shock that transfers to the diff. Now, start sending 550 lb-ft back there...

Dont do hole-shots, and I bet the odds are high your diff will last.

ronr

· #7 · Jun 9, 2007

jimmyhauser said:
I dont think torque (at least the stock 400) is the enemy of the diff, I think it is the excessive wheel hop some indulge in and all the shock that transfers to the diff. Now, start sending 550 lb-ft back there...

Dont do hole-shots, and I bet the odds are high your diff will last.

:yeah:

I agree that the enemy of our diff's is the hop not the torque

CTSV05

· #8 · Jun 9, 2007

When I annihilated My diff., I was not wheel hopping, the tires hooked and that was that, My car is stock.

Your rear will live indefinitely, if you never drive the car, and as for torque not being an issue, umm, I think you'll find most explosions have not been during the wheel hop problem, but rather from too much traction compared to the level of power at that moment.

There are several examples of the stock diff living....but everyone of those people will tell you...they have to baby the car, so then you are left to 3rd and 4th gear romps, well, thats great, but isnt most of a cars ability to brag based on 0-60 times? Hmmmm?

I have the solution.

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JimmyH

· #9 · Jun 9, 2007

CTSV05 said:
so then you are left to 3rd and 4th gear romps, well, thats great, but isnt most of a cars ability to brag based on 0-60 times? Hmmmm?

For some people it is, and that's fine for them. I lost interest in stoplight blasts years ago. Too much traffic around here anyway. And I dont have time for the track. 3rd and 4th is where this car shines. For me, it is all about the occasional charge up the expressway ramps. Even over the bumps this car holds them, and has the power to leave the wannabes and neverwillbes well in my wake.

rand49er

· #10 · Jun 9, 2007

High torque or wheel hop ... hmm-m.

The latter is easy to solve, just don't do burnouts. Bob, maybe this has been gone over a bunch already (sorry if it has), but how does the KARS kit help if torque is the enemy?

ryneV

· #11 · Jun 9, 2007

VCAT said:
well i called about a kit and was told i would need to change my vale springs and injectors to get the most HP's to the rear wheels. with a 5 psi boost at 39 hp per 1 psi of boost, so figure mostly stock i'm running 320 rwhp at best then the turbo would put me to about 515 if finly tuned.

You're going to need more than just those simple upgrades. And at 5psi, you're not going to add that kind of power. The enemy to our rear end is mainly wheel hop, don't let a big rwhp number scare you into a built $6,000+ rearend.

JimmyH

· #12 · Jun 9, 2007

I would be afraid of what one of those cradle systems would do the handling of the car. The V's poise and balance are more important to me than acceleration and traction.

CTSV05

· #13 · Jun 10, 2007

Why do so many talk of things you know not about? Hmmm?

My kit does nothing to the suspension..period! It merely ties the cradle and the body of the car together.

It improves ride quality, well, unless you enjoy the ass end squishing around, then in that case, it does diminish ride quality.

And as I said earlier, the majority of rear end failures have not been during wheel hopping episodes.

CTSV05

· #14 · Jun 10, 2007

Ummm.....all My wheel hop issues came on the shift(s), I could drive the car, albeit gingerly, off the line, but the 1-2 shift especially is where the hop was horrible.

I think there is some confusion, I was letting the guy know about My rear end package, not My kits for the cradle.

The rear will definitely solve the torque issue.

Ok, heres My rub, and if driving up a freeway ramp is sufficient excitment, then you wont need anything for your car.

But for those of Us out here, who believe that this car ought to be as impressive from a dead stop as going up a freeway ramp, I have provided a solution, not for those out there whom never push their cars, nor for those whom, feel the car is fine the way it is.

This thread started as a question about the diff holding up, and the answer is no, not if you add power...and dare I say it....drive the car accordingly.

Hell, I can baby a lawn tractor...not why I personally bought this car, a V.....I bought it to drive it, not showcase it in My driveway.

Do I drive hard, damn well better believe it.....hence, I focus My attention providing solutions for those others who do too. I know have 30K hard miles on Our diff, and its had the kit on since the factory break in, which btw, the diff started to whine at 400mi., its due for a replacement. Only as after those 30K mi., the whine is growing louder.

BTW, burnouts dont hurt anything, its once the tires begin hunting for traction, thats where the problems arise.

rand49er said:
High torque or wheel hop ... hmm-m.

The latter is easy to solve, just don't do burnouts. Bob, maybe this has been gone over a bunch already (sorry if it has), but how does the KARS kit help if torque is the enemy?

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rand49er

· #15 · Jun 10, 2007

CTSV05 said:
... I think there is some confusion, I was letting the guy know about My rear end package, not My kits for the cradle.

The rear will definitely solve the torque issue.

... and the answer is no, not if you add power ...

Yup, you're right ... I didn't realize there was a distinction. :hmm:

I bet probably half or more of the guys on here are looking to add power either small amounts through adding an exhaust system or like me adding FI. Not all of us do burnouts, but nearly 100% of us like a little WOT in 1st gear once in a while ... that's where the tires are mostly hooked up and the torque transmitted through the dif is highest (with the exception maybe of a spirited 1-2 shift).

So, focusing in on the rear end package, the package certainly can't reduce the torque being transmitted ... that's going to be the same. Is there some kind of flexing that occurs in the stock setup that is somehow detrimental to the dif and your package serves to eliminate that? Or, something else?

Just trying to understand it better. I'm about ready to install an FI system, and I consider these difs to be a consumable ... like tires or wiper blades.

CTSV05

· #16 · Jun 10, 2007

rand49, did you go to the Traction Package page?

I explain it there, I eliminate the entire drivetrain from the trans back, replacing it with much heavier duty parts.

G

· #17 · Jun 10, 2007

Who has a turbo kit for our car?

rand49er

· #18 · Jun 10, 2007

CTSV05 said:
rand49, did you go to the Traction Package page?

I explain it there, I eliminate the entire drivetrain from the trans back, replacing it with much heavier duty parts.

:duh: Gotcha.

Florian

· #19 · Jun 10, 2007

VCAT said:
I know there are some of you guys out there with superchargers and turbos that's why i posted this, will i have to put a new rear end in my V with a turbo putting 500 to 550 rwhp?

your rear cant hold 400HP, what makes you think itll hold 550?

F

rand49er

· #20 · Jun 11, 2007

Florian said:
your rear cant hold 400HP, what makes you think itll hold 550?

F

Ain't it the truth.

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