LS3 bs L99 fuel pumps and boost-a-pumps - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

general23cmp · 09-11-2010, 02:11 PM

I have seen some posts that state something similar to the following:

"the L99 stock fuel pump is good for about 525rwhp and the LS3 is good for about 575rwhp prior to requiring a boost-a-pump"

I understand the limitations of the L99 that make it put down less power than the LS3, and I also understand the slight powertrain loss advantage of the m6. The fuel pumps I believe are the same PN. So why is a comment like the above true? I would understand a few percent difference because of powertrain loss differences, but not 10 percent. If the pumps are the same, I would expect the horsepower limits (at the flywheel) to be the same. The L99 might require more boost to get there, but the BSFC (amount of fuel to make horsepower) should be similar especially since both are in PE mode at that point.

Thanks in advance for the comments.

Slowhawk · 09-11-2010, 07:18 PM

Automatic tranny's consume more fuel per hp.

Guardian · 09-11-2010, 07:51 PM

The pumps flow the same amount to support equal HP in regards to at the flywheel. However, nobody really refers to crank HP and most discussions center around wheel HP for obvious reasons. Since you lose more through the drive train, the ammount of wheel HP that can be supported by the fuel pump is less than that of a manual transmission.

general23cmp · 09-11-2010, 09:11 PM

Quote:

Originally Posted by Guardian

The pumps flow the same amount to support equal HP in regards to at the flywheel. However, nobody really refers to crank HP and most discussions center around wheel HP for obvious reasons. Since you lose more through the drive train, the ammount of wheel HP that can be supported by the fuel pump is less than that of a manual transmission.

Agreed on all points, but there isn't a 10 percent (or more in some cases) drivetrain loss difference is there, which is what the numbers for pump limits are telling me?

Slowhawk · 09-11-2010, 09:21 PM

Every car is different.Same setup on 4 different cars and they probly all run out of pump at different hp levels.Rated at the crank would be better BUT different blowers take different levels of hp from the crank to drive the belt. The #'s you list above are just guesses or recommended.

general23cmp · 09-11-2010, 09:36 PM

I guess the point or question I had was why are the numbers I see reported for maximum (based on the fuel pump's output only) rear wheel power for an auto vs a manual just not the drivetrain loss difference? The gap between the posted numbers is too large to just be drivetrain loss.

The drivetrain loss numbers I have seen are 5 percent better for a manual vs an auto, so given the same fuel pump, I'd expect the maximum horsepower output the fuel pump could supply either of them to the rear wheels to be within 5 percent.

Thanks.

09-11-2010, 02:11 PM	#1
general23cmp Drives: 2010 RS SS Join Date: Aug 2009 Location: Huntsville, AL Posts: 196	LS3 bs L99 fuel pumps and boost-a-pumps I have seen some posts that state something similar to the following: "the L99 stock fuel pump is good for about 525rwhp and the LS3 is good for about 575rwhp prior to requiring a boost-a-pump" I understand the limitations of the L99 that make it put down less power than the LS3, and I also understand the slight powertrain loss advantage of the m6. The fuel pumps I believe are the same PN. So why is a comment like the above true? I would understand a few percent difference because of powertrain loss differences, but not 10 percent. If the pumps are the same, I would expect the horsepower limits (at the flywheel) to be the same. The L99 might require more boost to get there, but the BSFC (amount of fuel to make horsepower) should be similar especially since both are in PE mode at that point. Thanks in advance for the comments.

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09-11-2010, 07:18 PM	#2
Slowhawk Drives: 1999 Trans Am Join Date: Jul 2009 Location: Bridgewater,Ma Posts: 2,017	Automatic tranny's consume more fuel per hp.

09-11-2010, 07:51 PM	#3
Guardian Drives: 2004 Tiburon SE Join Date: Sep 2010 Location: New London CT Posts: 5	The pumps flow the same amount to support equal HP in regards to at the flywheel. However, nobody really refers to crank HP and most discussions center around wheel HP for obvious reasons. Since you lose more through the drive train, the ammount of wheel HP that can be supported by the fuel pump is less than that of a manual transmission.

09-11-2010, 09:21 PM	#5
Slowhawk Drives: 1999 Trans Am Join Date: Jul 2009 Location: Bridgewater,Ma Posts: 2,017	Every car is different.Same setup on 4 different cars and they probly all run out of pump at different hp levels.Rated at the crank would be better BUT different blowers take different levels of hp from the crank to drive the belt. The #'s you list above are just guesses or recommended.

09-11-2010, 09:36 PM	#6
general23cmp Drives: 2010 RS SS Join Date: Aug 2009 Location: Huntsville, AL Posts: 196	I guess the point or question I had was why are the numbers I see reported for maximum (based on the fuel pump's output only) rear wheel power for an auto vs a manual just not the drivetrain loss difference? The gap between the posted numbers is too large to just be drivetrain loss. The drivetrain loss numbers I have seen are 5 percent better for a manual vs an auto, so given the same fuel pump, I'd expect the maximum horsepower output the fuel pump could supply either of them to the rear wheels to be within 5 percent. Thanks.