3" exhaust = POWER!! - Page 2 - 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 12-20-2004, 06:26 PM   #11
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Lets see some pics!
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Old 12-20-2004, 06:46 PM   #12
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Those are some good numbers ! Keep up the good work.
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Old 12-20-2004, 06:47 PM   #13
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Quote:
Originally Posted by Dans2002bonne
The 240 HP is not stock wheel power. Most are around the 190'* in stock form.
yes there is driveline loss....the 240 is at the crank
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Old 12-20-2004, 08:10 PM   #14
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I've heard that these L67'* can be very different -some dynoing under the advertised 240/280, but alot more have actually dyno'ed over, especially in the lb ft department.
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Old 12-20-2004, 08:12 PM   #15
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with the */C pulling the air the the weather, temperature and dew point all have a factor on the dyno numbers
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Old 12-20-2004, 08:24 PM   #16
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Quote:
Originally Posted by OLBlueEyesBonne
I've heard that these L67'* can be very different -some dynoing under the advertised 240/280, but alot more have actually dyno'ed over, especially in the lb ft department.
Yeah, but that 240/280 is at the engine. You have to take into account the drivetrain loss of approx. 20%. 20% loss of 240hp would be 192whp.

However, a 3" exhaust is too large for these cars. I would bet the only reason power was gained was due to the reduced KR from the exhaust/rockers. My dads GTP with no exhaust (headers and 3" downpipe only) dynoed 304whp, with his 2.25" borla it made 315whp. He gained 11whp when he put his 2.25" exhaust back on. And obviously his car is a little more than mildly modded.

So when did you put the PCM in??? The first pull says 3.4 pulley only. Second pull says 3.4 pulley, 1.9 rockers, 3" exhaust. Yet, your sig says you also have a DHP!?!?

Shawn
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Old 12-20-2004, 08:36 PM   #17
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Quote:
Originally Posted by dbtk2
Quote:
Originally Posted by OLBlueEyesBonne
I've heard that these L67'* can be very different -some dynoing under the advertised 240/280, but alot more have actually dyno'ed over, especially in the lb ft department.
Yeah, but that 240/280 is at the engine. You have to take into account the drivetrain loss of approx. 20%. 20% loss of 240hp would be 192whp.



Shawn
Yup, I realize that. Meant CHP.
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Old 12-21-2004, 12:25 AM   #18
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I think 3" exhaust is a good setup, for a modded L67, especialy series II. It would be more beneficial on a car with nice headers, but all in good time. Frankly More Lower end torque isn't needed, L27'* can spin tires past the torque peak with ease, Upper RPM power is what the 3800 is missing. You only hit your torque peak once in the 3800 when you're racing.

Willwren'* car is bolt-ons at this point. he'* got some good stuff down the line, but not yet.
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Old 12-21-2004, 12:38 AM   #19
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Hmm...what kind of gains are you guys seeing with just the 1.9'ers?
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Old 12-21-2004, 12:44 AM   #20
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The 1.9 rockers will add 23 whp or 29 nethp alone.
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