Cam and intake options, compression options... for my C5Z 430 build
10-13-2016, 12:26 PM
#1
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Cam and intake options, compression options... for my C5Z 430 build Car is a C5Z, C5Z trans gearing.. about 2990lbs without me in it, PRC 265 LS7's with OEM bushed rockers 1 7/8" Kooks. Not looking to spin any higher than 7600rpm with the Compstar bottom end and 4" arm. This is a pump gas, 91 octane car.
Current cam is a 243/259 ~.630" 113.5+4.... had planned on running this cam with the MSD manifold/NW 102 setup. Hoping it pulled to about 7300. The compression being 11.67:1 with a calculated DCR of 8.26:1 and quench of .046". (If i stay this combo, ill be swapping out .045" gasket to .040" gasket to drop quench to .041", which will change compression to 11.82 and DCR to 8.36:1)
Well I've got the itch to go Hi Ram....
The new idea is to up the cam to a 248/260 113.5+4 about the same lift. Upping the compression to 12:1 which puts the DCR at 8.36:1 with a quench of .041"... and spinning this cam and Hi Ram to no more than 7600rpm.
Will I be better off with the more top end pull or will the lack of Tq with the new cam and shorter runners kill the punch in this combo?
Current cam is a 243/259 ~.630" 113.5+4.... had planned on running this cam with the MSD manifold/NW 102 setup. Hoping it pulled to about 7300. The compression being 11.67:1 with a calculated DCR of 8.26:1 and quench of .046". (If i stay this combo, ill be swapping out .045" gasket to .040" gasket to drop quench to .041", which will change compression to 11.82 and DCR to 8.36:1)
Well I've got the itch to go Hi Ram....
The new idea is to up the cam to a 248/260 113.5+4 about the same lift. Upping the compression to 12:1 which puts the DCR at 8.36:1 with a quench of .041"... and spinning this cam and Hi Ram to no more than 7600rpm.
Will I be better off with the more top end pull or will the lack of Tq with the new cam and shorter runners kill the punch in this combo?
Last edited by FRiCK; 10-13-2016 at 01:49 PM.
10-14-2016, 01:34 PM
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My thoughts.... the 265cc intake port, the cubes, the compression, the shorter gearing and the 2990lb car doesn't need all that Tq, and I could probably get away with running the holley, especially if it gave me potentially another 40rw out back from say 5500rpm and up.
Was hoping I could just get some different view points with this. The aesthetics of the holley don't bother me. And I prefer the installation of the holley over the MSD.
Was hoping I could just get some different view points with this. The aesthetics of the holley don't bother me. And I prefer the installation of the holley over the MSD.
10-15-2016, 11:00 AM
#7
12:1 and a splash of Torco octane booster
http://www.torcousa.com/torco_product/un_acce.html
My thoughts are the Holley Hi Ram doesn't really shine until above 6500rpm and gets crushed by the MSD Atomic below that.... if you need more power just spray a 100hp nitrous shot and have the better driveability with the composite intake.
http://www.torcousa.com/torco_product/un_acce.html
My thoughts are the Holley Hi Ram doesn't really shine until above 6500rpm and gets crushed by the MSD Atomic below that.... if you need more power just spray a 100hp nitrous shot and have the better driveability with the composite intake.
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10-17-2016, 11:07 AM
#9
For such a light car, with tight gearing, I imagine you have more than enough torque to get moving with a built 430.
Also depends on the type of driving you do. For an all out drag car, you never really spend much time below 5000rpm anyway so any extra power up top is going to help even at the loss of some low end torque.
For a road racer, it also depends on the course and what types of turns (and at what speed) you take. If you find yourself more often at the bottom of a gear but too high for the previous gear, then maybe some low end torque will be beneficial over high end power.
Also depends on the type of driving you do. For an all out drag car, you never really spend much time below 5000rpm anyway so any extra power up top is going to help even at the loss of some low end torque.
For a road racer, it also depends on the course and what types of turns (and at what speed) you take. If you find yourself more often at the bottom of a gear but too high for the previous gear, then maybe some low end torque will be beneficial over high end power.
10-17-2016, 06:46 PM
#10
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I would imagine that the displacement and 12:1 compression would be plenty enough torque for a ~3000# vehicle. Any torque lost on the low end from the Holley would simply aid with traction.
Your intended use, and whichever track(s) you prefer will determine whether or not the switch to the Hi-Ram will be beneficial.
I personally think that the MSD would provide more benefit through a wider range of useful rpms, but I do not know what you consider useful as far as rpms are concerned.
Your intended use, and whichever track(s) you prefer will determine whether or not the switch to the Hi-Ram will be beneficial.
I personally think that the MSD would provide more benefit through a wider range of useful rpms, but I do not know what you consider useful as far as rpms are concerned.
