3" exhaust = POWER!! - Page 4 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 12-21-2004, 11:12 PM   #31
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I think the percentage will shift depending on power being delivered, and the rated power handling capability.

Now manuals on the other hand... Are pefect.
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Old 12-21-2004, 11:22 PM   #32
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Quote:
Originally Posted by 2000SilverBullet
Yes, I would have to agree with that.
More power usually means more heat and frictional losses so the power loss increases as a percent.
would now be a good time to throw in that your clutches work because of the extreme heat of the fluid between them?

nah, i'll just let this one go...
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Old 12-21-2004, 11:46 PM   #33
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Quote:
would now be a good time to throw in that your clutches work because of the extreme heat of the fluid between them?
I wasn't referring to clutches.
I was referring to mechanical components like gears, cams, chains,....and sliding components that lose power due to increased rpm that usually results from hp increases.
Most high hp is gained above factory limits of 5000-5500 rpm.....like 5500 - 7000 rpm.
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Old 12-21-2004, 11:54 PM   #34
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Quote:
Originally Posted by mkaake
Quote:
Originally Posted by 2000SilverBullet
Yes, I would have to agree with that.
More power usually means more heat and frictional losses so the power loss increases as a percent.
would now be a good time to throw in that your clutches work because of the extreme heat of the fluid between them?

nah, i'll just let this one go...
explain to us how they work. I wanna know.

Our cars have plenty of torque, upgrading to a bigger exhaust on a SC car wouldnt hurt. You want to get that hot air out of there as fast as possible.
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Old 12-21-2004, 11:55 PM   #35
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Quote:
Originally Posted by mkaake
Quote:
Originally Posted by 2000SilverBullet
Yes, I would have to agree with that.
More power usually means more heat and frictional losses so the power loss increases as a percent.
would now be a good time to throw in that your clutches work because of the extreme heat of the fluid between them?

nah, i'll just let this one go...
explain to us how they work. I wanna know.

Our cars have plenty of torque, upgrading to a bigger exhaust on a SC car wouldnt hurt. You want to get that hot air out of there as fast as possible.
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Old 12-22-2004, 12:17 AM   #36
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What about us lowly Series 1 l-67 owners . Will the 1.9 rockers fit ?


Jlathem
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Old 12-22-2004, 12:18 AM   #37
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Quote:
Originally Posted by jlathem
What about us lowly Series 1 l-67 owners . Will the 1.9 rockers fit ?


Jlathem
No sorry. Dr.Jay had a group buy going on for 1.7'*.
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Old 12-22-2004, 11:04 AM   #38
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just to put in my two cents . . . i have read a few reports done in HOT ROD and another performance magazine that did dyno tests on exhausts. as many here have already mentioned going big is not necessarily the way to go. depending on the engine size and the horsepower (volume of air expended really) the exhaust was supposed to be from 2.5 in to 3 in. it seem the 3" was only needed for the really BIG stuff, and even then there were trade offs with torque and where to put the H-bar cross overs for evacuation.

and as a last note . . . Running OPEN headers may sound like a race car but it kills your tuning UNLESS you set it up that way. some backpressure and crossover evacuation is a good thing for free flowing exhausts.
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Old 12-22-2004, 12:21 PM   #39
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But I'm sure with that 3" exhaust, there'* almost no KR, which is a great thing.
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Old 12-22-2004, 04:47 PM   #40
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As far as the horsepower gain from the 1.9 rockers.......I installed these prior to the end of the year and before the exhaust went on. Taking it to the track, before the rockers my MPH, a good reflection of HP, was 97 to 97.5. After the rockers were put on, it did not change, I never even hit 98 MPH. I equate this to the added lift needed something else to be done to be beneficial. I have not gone to the track yet since the exhaust has been done(I'm in Michigan) but in April we will see. So my conclusion is next to no gain with the rockers without a supportive mod to help get the air out as your increasing flow at the head. However, the big exhaust would never pick up this type of power on its own wither, hence the two compliment each other well.
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