Performance questions............

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Jun 17, 2007 | 09:55 PM

ROUSHMAN CONVERT

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Joined: Apr 2007

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From: Schuamburg IL

Performance questions............

1) Are the claims or royal purple oil giving 9hp on a LS1 motor, bs or not?

2) Where are the restrictions in the factory exhaust, and what component/s should be replaced first? I had a '06 Monte Carlo SS and just removed factory mufflers and just used the existing resonators, sounded good..................now with my '07 Coupe, I'm not prone just to gut the exhaust by just removing the mufflers, any advice?

Jun 17, 2007 | 10:17 PM

jschindler

Team Owner

Joined: Jun 2001

Posts: 26,714

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From: Houston, TX

Quote:

Originally Posted by ROUSHMAN CONVERT

I don't know about #1, but I highly doubt it. In my 6 years on this forum, not once have I seen anyone substantiate an increase due to oil. I can assure you, if it did, they would not be able to make enough of it for the forum members who would use it.

I can speak to #2. There is no big restriction anywhere in the exhaust. Very minimal gains are to be had in changing the "H" pipe or rear section. You'd be doing good to pick up 7 or 8 rwhp. The increases to be had would be with headers and high-flow cats.

Jun 18, 2007 | 12:22 AM

jimmie jam

Le Mans Master

Joined: May 2005

Posts: 6,658

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From: FORT LAUDERDALE FL

internal combustion engines are air pumps. more air and fuel = more power. i don't see how oil fits in the picture. i could be wrong.

Jun 18, 2007 | 08:26 AM

Dvlray6

Drifting

Joined: Dec 2005

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From: Port Neches Texas

St. Jude Donor '07-'08-'09

Quote:

Originally Posted by jimmie jam

internal combustion engines are air pumps. more air and fuel = more power. i don't see how oil fits in the picture. i could be wrong.

Oil fits in by reducing a parasitic friction loss between moving engine parts. The theory is sound, but I haven't seen any dyno tests to substantiate. The more likely place to look for differences between oils is in how well they withstand breaking down under heat and pressure. This will primarily effect how long between oil changes - which around here is a moot point as folks change oil failry regularly.

I'd love to see an actual study on #1 though.

Jun 18, 2007 | 09:10 AM

haljensen

Race Director

Joined: Mar 2005

Posts: 10,399

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From: Austin Texas

The exhaust from the manifolds back is 2.5" except for the muffler outlets. Each muffler has a less than 2" OD single outlet.

Jun 18, 2007 | 11:42 AM

Vetteinplano

Burning Brakes

Joined: Nov 2005

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From: Plano TX

I believe that Horsepower TV did a story on Royal Purple a couple of years ago, on an LS1 Camaro. They replaced the fluids in the Engine/Trans/Diff and got 10 HP (on a dyno)

2000 Camaro SS 5.7 LS1 / T-56 manual transmission / LSD 3.42:1
Test conducted by Horsepower TV

Jun 18, 2007 | 12:42 PM

fignewton

Instructor

Joined: Jul 2006

Posts: 163

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From: Broad Run VA

Go to their web site and look at the testimonials....

which include run/drain/fill/re-test by several car mags who were also skeptical. Also, in the past, I've seen testimonials from fleet operators, large diesel generator operators, and the best, from an Indycar engine builder who wrote to tell them an anecdote about an engine that lost oil pressure and still finished the race, with no damage noted on teardown.
Plus, the street oil now meets the GM standard for our cars.
I'll be changing after I'm through break-in 5K miles.
fig