GMPP vs Victor Jr. Carb Style.... runner length and peak HP question?
04-22-2007, 11:41 AM
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GMPP vs Victor Jr. Carb Style.... runner length and peak HP question? I have a GMPP L92 intake.
My question is:
On a traditional LSX cathedral setup, you have the choice of a edelbrock and gmpp intake. The GMPP is shorter, and has shorter runners. The Edelbrock piece sits higher and has longer runners. I took my L92 GMPP intake and sat it next to a Victor Jr. It is much shorter but has much larger volume runners.
Which one will peak RPM the highest and why?
Also will hogging out the GMPP intake raise or lower the rpm? What can you do to add more low end torque? Do spacers make a difference??
My question is:
On a traditional LSX cathedral setup, you have the choice of a edelbrock and gmpp intake. The GMPP is shorter, and has shorter runners. The Edelbrock piece sits higher and has longer runners. I took my L92 GMPP intake and sat it next to a Victor Jr. It is much shorter but has much larger volume runners.
Which one will peak RPM the highest and why?
Also will hogging out the GMPP intake raise or lower the rpm? What can you do to add more low end torque? Do spacers make a difference??
04-22-2007, 11:47 AM
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Originally Posted by danf1000
runner length and runner diameter. with a set length (such as a pre-exisitng design) the only variable is diameter, or sectional area. if possible this area is kept as consistent as possible.
longer and smaller cross section runners are good for torque and short fat runners are better for high-end horsepower, generally speaking. but you already said that.
longer and smaller cross section runners are good for torque and short fat runners are better for high-end horsepower, generally speaking. but you already said that.
I assume the GMPP intake peaks much higher then the victor jr...... but what happens after you port it? Should I just smooth it out and leave it unported due to losing low end torque?
04-25-2007, 08:48 PM
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You need to give more details on your engine combo.
Forced induction or naturally aspirated?
Cam specs.?
Gears?
Obviously your using L92 heads, but any port work on the exhaust side?
Forced induction or naturally aspirated?
Cam specs.?
Gears?
Obviously your using L92 heads, but any port work on the exhaust side?
05-04-2007, 03:44 PM
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i believe the victor jr is maxed out at an earlier rpm than the gmmp intake and will more than likely make more on the low end. the gmmp re worked likes big rpms, thats where it likes to be. i am just speaking for myself with my na LS based solid roller build. it hasnt been dynoed yet, but time will soon tell.
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06-03-2007, 02:49 PM
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Originally Posted by BryanJohnson
i believe the victor jr is maxed out at an earlier rpm than the gmmp intake and will more than likely make more on the low end. the gmmp re worked likes big rpms, thats where it likes to be. i am just speaking for myself with my na LS based solid roller build. it hasnt been dynoed yet, but time will soon tell.
so... compare what happens when you swap the wider ports on a GMPP intake for longer runners on the victor jr? Would it be wise to "port" the GMPP intake or would you just polish it up?
06-04-2007, 06:05 AM
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Originally Posted by Forteen3GT
so... compare what happens when you swap the wider ports on a GMPP intake for longer runners on the victor jr? Would it be wise to "port" the GMPP intake or would you just polish it up?
06-13-2007, 09:42 PM
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Originally Posted by LSPerformance
If getting from A to B quick is your game, I've found this to work and be within 100 rpm every time
97000 / runner length from valve seat to plenum = hp peak rpm
hp rpm peak x .85 = torque peak rpm
97000 / runner length from valve seat to plenum = hp peak rpm
hp rpm peak x .85 = torque peak rpm
Are we using inches for the runner length?
