IRS drivetrain loss?

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01-22-2007, 08:17 PM

ZW99GT

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IRS drivetrain loss?

I was reading in the S/S section about some stupid LS1 argument. They said that a LS1 vette will dyno lower than a LS1 Fbody b/c ofIRS.

Does IRS really cause lower rwhp? If so, how much?

01-22-2007, 08:29 PM

ben790450

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RE: IRS drivetrain loss?

There are more moving joints on an IRS. For every joint you have you have friction loss. Thats why a 4wd truck dynos lower than a 2wd truck even if they are the exact same.

01-22-2007, 08:30 PM

wisk

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RE: IRS drivetrain loss?

Well comparing between straight axle and IRS, yes there should be some horsepower loss because you are adding more moving parts. How much? I haven't a clue.

01-22-2007, 09:15 PM

BraMas

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RE: IRS drivetrain loss?

I have to disagree with you guys on the more moving parts theory. they both have a diff that either spins 2 axle shafts or they spin 2 half shafts. I would lean toward Rotating Mass being the culprit of less HP from the same engine. I guess the only was to know is if someone dynoed with a IRS and than pulled it dynoed with a solid axle and compare.

01-22-2007, 09:53 PM

ben790450

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RE: IRS drivetrain loss?

Yes but the IRs has pivot points and the Solid axle doesnt. It pivots on the joints where as a solid is straight. That is more moving parts.

01-22-2007, 10:06 PM

GreyStang

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RE: IRS drivetrain loss?

Quote:

ORIGINAL: BraMas

I have to disagree with you guys on the more moving parts theory. they both have a diff that either spins 2 axle shafts or they spin 2 half shafts. I would lean toward Rotating Mass being the culprit of less HP from the same engine. I guess the only was to know is if someone dynoed with a IRS and than pulled it dynoed with a solid axle and compare.

Not sure how many Vette owners would swap their IRS for a live axle lol, but from what I hear there are some Cobra Terminator owners that have done this swap. Maybe find one of those guys for the compare differences