cam too big for boost?
06-02-2009, 12:35 PM
#1
cam too big for boost? 
Would this cam be ok with my setup in sig? Im just concerned with the duration.http://store.summitracing.com/partde...8&autoview=sku
06-02-2009, 01:25 PM
#2
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I dont see that cam being boost friendly. I dont think its bad and Im sure you could run that cam and make good power but, Im sure theres alot more options out there that would be more suited for your application.
06-02-2009, 01:53 PM
#3
FormerVendor
Would this cam be ok with my setup in sig? Im just concerned with the duration.http://store.summitracing.com/partde...8&autoview=sku
06-02-2009, 02:43 PM
#4
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Hello!
Mine is a 346ci, with 232/240 .598 .608 112 LSA, with a D1 on top of it! This is a road racing ride, and all I can tell you is that up top it is a beast
Pretty close to 550 rwhp with 5.5 psig. I do not think that 113 LSA is killing that much boost, if any. I would say go for it. BTW based on the specs from the cam, I would assume that you have an stroker, or big cubes?
Mine is a 346ci, with 232/240 .598 .608 112 LSA, with a D1 on top of it! This is a road racing ride, and all I can tell you is that up top it is a beast
Pretty close to 550 rwhp with 5.5 psig. I do not think that 113 LSA is killing that much boost, if any. I would say go for it. BTW based on the specs from the cam, I would assume that you have an stroker, or big cubes?
06-04-2009, 01:17 PM
#6
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That cam would be a monster in a turbo car. I'd like to see the ICL at around 111*; Comp usually grinds more advance into their cams, so you'd need to use an adjustable timing set to retard it back.
Flame suit on for all the naysayers who read something on the internet, but have never actually run a big cam in a turbo car, to tell me it won't work
Flame suit on for all the naysayers who read something on the internet, but have never actually run a big cam in a turbo car, to tell me it won't work
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06-04-2009, 09:13 PM
#8
I have a.598/.608 lift 234/240 duration 112lsa cam in my car i was thinking about using a d1sc but didnt want to swap the cam until i change the whole shortblock do you guys think this cam would be too much for a blower?
ps sorry to cut in on your thread
ps sorry to cut in on your thread
06-05-2009, 06:14 AM
#9
With a free flowing exhaust, it has been shown repeatedly that high overlap cams work well with a blower. You don't have to contend with with exhaust pressure behind the exhaust valve. I would atleast try it to have a base for comparison before you go changing it around.
06-05-2009, 09:18 AM
#10
FormerVendor
That cam would be a monster in a turbo car. I'd like to see the ICL at around 111*; Comp usually grinds more advance into their cams, so you'd need to use an adjustable timing set to retard it back.
Flame suit on for all the naysayers who read something on the internet, but have never actually run a big cam in a turbo car, to tell me it won't work
Flame suit on for all the naysayers who read something on the internet, but have never actually run a big cam in a turbo car, to tell me it won't work
Unless of course he's got twin 76's or maybe a 101 or something going on.
06-05-2009, 10:36 AM
#11
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Big cams do work in turbo cars that can utilize them. Key parts of his combination are missing but when you can efficiently make 1000 rwhp with a cam much smaller than the one he listed you are only going to give up driveability and low rpm power for no benefits up top.
Unless of course he's got twin 76's or maybe a 101 or something going on.
Unless of course he's got twin 76's or maybe a 101 or something going on.
Keep in mind that his motor is an LT1, which due to the more restrictive cylinder heads, requires more cam than a comparable LS based mill.
Bigger cams with more overlap can work very well IF the turbine(s) are sized to not choke the motor. In a street car application, it can be beneficial to run big cam / large turbine combos, because it softens the hit down low where traction tends to be an issue, and gives a monster top end charge where you can use it. The larger cams, coupled with bigger turbos, can also make more power at lower boost, and subsequently cooler IATs, which can be beneficial on an octane limited street motor. The reduced back pressure from the big turbines, and early EVO events, also reduce the chances of lifting a head / pushing water, which is often a problem for production 4-bolt LS series blocks.
Of course, it is possible to make great power, and enjoy near stock driveability with instant boost response, from a smaller cam and turbo combos. But, there are also other viable options for those who don't mind getting a little aggressive.
Edit: and btw; twin 76's, with big ol' honkin' .96 a/r housings, are right up my alley
Last edited by RAACCR; 06-05-2009 at 10:44 AM.
06-06-2009, 01:49 PM
#12
FormerVendor
Would this cam be ok with my setup in sig? Im just concerned with the duration.http://store.summitracing.com/partde...8&autoview=sku
Ok, lets figure this out then.
What turbo, engine specs, engine management/fuel system, goals?
If it's stock pcm and relatively stock LT1 as your signature would suggest than I will stand by my original thought that you do not need nor would benefit from a cam of that size.
I'm no stranger to turbo LT1's, mine had a 218/218 @.050 cam and made 850rwhp, ran 9.7@149mph/3800lbs in the 1/4 and 199.4mph in a standing mile. That car could have benefit some from a larger cam but anything even past mid 230's duration would probably just be past the point of diminishing return with 2 61mm .69a/r P-trim turbos.
