L33 cam selection help
02-07-2011, 03:55 PM
#1
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L33 cam selection help I'm putting a L33 into a miata and wanted some help as to what cam to go with.
The motor is a 5.3L, 9.9:1, 799 heads.
The car will be ~2500lbs and a track only car (road race). Looking for a powerband from 4000-6800ish.
I'm very fresh to the LS motor world so any help is greatly appreciated!
The motor is a 5.3L, 9.9:1, 799 heads.
The car will be ~2500lbs and a track only car (road race). Looking for a powerband from 4000-6800ish.
I'm very fresh to the LS motor world so any help is greatly appreciated!
02-08-2011, 09:04 AM
#2
Check my sig for numbers and parts.
Cam is right on the limits for the motor, low end is pretty much gone, but shes a screamer up top. Kinda hard to tune, plan on bumping your idle a good 150-200 rpms to keep it running. I dd the car in the summer and sometimes its just to much. Bumping the CR should help a ton.
This is a post I made in another 5.3 cam thread. You have an l33 so youve already got a higher CR than I do, so you should make a bit more power.
Cam is right on the limits for the motor, low end is pretty much gone, but shes a screamer up top. Kinda hard to tune, plan on bumping your idle a good 150-200 rpms to keep it running. I dd the car in the summer and sometimes its just to much. Bumping the CR should help a ton.
This is a post I made in another 5.3 cam thread. You have an l33 so youve already got a higher CR than I do, so you should make a bit more power.
02-08-2011, 07:09 PM
#4
I helped build a really budget race 5.3 for a wheel to wheel off-road racetruck. 280/230 112 cam, victor jr, and .050 milled 5.3 heads with mild bowl porting by me. power started at 3500ish, and pulled to around 7000, and went to 7500 pretty easy.
An easy way to get some more compression out of it would be to get a set of 5.3 heads - that will bring you up to 10.5 w/o any milling, .030 will bring you over 11, and .050 should bring you close to 11.5. The 5.3 heads will support 7000 pretty easily, the min csa of 2.2" is still on the large side for the engine size/rpm you want to go to.
Cut down a set of ls 2.00 valves down to 1.96 (52% of 3.78) and keep the valves less shrouded (should do a big of chamber work there, will hurt your chamber cc's a bit though). This will also allow you to get a nice valve job done, which is a quick way to get some more flow/power out of these heads.
A cam right around the 230 duration on both intake and exhaust with a lift around .600 should put the power right where you want it.
An easy way to get some more compression out of it would be to get a set of 5.3 heads - that will bring you up to 10.5 w/o any milling, .030 will bring you over 11, and .050 should bring you close to 11.5. The 5.3 heads will support 7000 pretty easily, the min csa of 2.2" is still on the large side for the engine size/rpm you want to go to.
Cut down a set of ls 2.00 valves down to 1.96 (52% of 3.78) and keep the valves less shrouded (should do a big of chamber work there, will hurt your chamber cc's a bit though). This will also allow you to get a nice valve job done, which is a quick way to get some more flow/power out of these heads.
A cam right around the 230 duration on both intake and exhaust with a lift around .600 should put the power right where you want it.
