So many different cams these days.
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So many different cams these days. Ive been calling around to get a new cam spec for my car and have been getting a lot of different ideas from all the big cam sponsors. Im confused.
I won't list names unless its off the shelf.
These are cams Im considering for my 9.5:1 forged 370 with a t4 comp 88mm turbo.
Tu2 by speed inc 236/236 578/.578 112.5lsa.
This cam seems to go against everyone elses and everything ive read about good turbo cams. But has great reviews and from a great shop, just dont get the 112.5 lsa and low lift.
I was spec'd a 225/231 .610/.612 on 115lsa.
Then one said since its a t4 on a 370 a 232/227 .600/.600 115.
My current cam was spec'd from a big shop, its a 232/236 .595/.602 115+4lsa on xer lobes.
My issue is the xer lobes which I hear are tough on springs and unstable. Im trying to make power past 6k and that's not happening with the current cam. Could be some thing else but for the low cost of a cam id like to have the correct one in there.
I won't list names unless its off the shelf.
These are cams Im considering for my 9.5:1 forged 370 with a t4 comp 88mm turbo.
Tu2 by speed inc 236/236 578/.578 112.5lsa.
This cam seems to go against everyone elses and everything ive read about good turbo cams. But has great reviews and from a great shop, just dont get the 112.5 lsa and low lift.
I was spec'd a 225/231 .610/.612 on 115lsa.
Then one said since its a t4 on a 370 a 232/227 .600/.600 115.
My current cam was spec'd from a big shop, its a 232/236 .595/.602 115+4lsa on xer lobes.
My issue is the xer lobes which I hear are tough on springs and unstable. Im trying to make power past 6k and that's not happening with the current cam. Could be some thing else but for the low cost of a cam id like to have the correct one in there.
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From: Northwest side of Chicago
3600 vig 3disc,325 gears, ported 241 heads, ls6 intake/tb. 3840lbs Trans am with a tbrake, street driven but going for low 9s.
Best time so far is 9.8@138 at 20psi.
Best time so far is 9.8@138 at 20psi.
if it wont pull over 6k I don't think the cam is the issue .sounds like a backpressure or valve spring problem. if it has high backpressure it will pickup power with less cam. some guys are getting up to 65-6600 rpm with an isky triple 12 cam and it is much less duration than all of those cams listed. what is the turbine wheel size and housing a/r. ?
Cam number two is the closest for a t4 but needs a little less on the exhaust side. It is easy to over cam the T4 housings. The speed inc one would be great with a free flowing housing though.
Have you measured the exhaust back pressure on your current setup? What AR t4? Exh wheel size?
Last edited by Forcefed86; Dec 26, 2013 at 09:32 AM.
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Not sure on verter slip, I did measure back pressure it was 35psi at 20psi boost.
Its a 1.10 ar 88mm billet comp wheel with a 94/88 turbine 4 inch open dp.
Leaving on 3psi with the tbrake gets me a mid 1.4 60ft. I haven't tried more off the line but I think it could go 5psi with no wheel spin.
Its a 1.10 ar 88mm billet comp wheel with a 94/88 turbine 4 inch open dp.
Leaving on 3psi with the tbrake gets me a mid 1.4 60ft. I haven't tried more off the line but I think it could go 5psi with no wheel spin.
Jim Moran @ speed inc had a 3900# Lt1 camaro fully loaded street car trapping 145+ over 10 years ago. He might know a thing or 2 about what works.
Your current cam is a 115+4 and the speed inc is on a 112.5. I bet the 2 intake centerlines are really close. The IVO and IVC are probably pretty close too.
Your current cam is a 115+4 and the speed inc is on a 112.5. I bet the 2 intake centerlines are really close. The IVO and IVC are probably pretty close too.
Not sure on verter slip, I did measure back pressure it was 35psi at 20psi boost.
Its a 1.10 ar 88mm billet comp wheel with a 94/88 turbine 4 inch open dp.
Leaving on 3psi with the tbrake gets me a mid 1.4 60ft. I haven't tried more off the line but I think it could go 5psi with no wheel spin.
Its a 1.10 ar 88mm billet comp wheel with a 94/88 turbine 4 inch open dp.
Leaving on 3psi with the tbrake gets me a mid 1.4 60ft. I haven't tried more off the line but I think it could go 5psi with no wheel spin.
[/URL] if that dyno graph is with a triple 12 cam there is no reason to run a bigger cam in most of these street engines unless they want to loose down low and add spool time.
I see a lot of cars running these 230+duration cams. to me those are max effort open dump tube , big turbine wheel cams. they work good but ad a smaller turbine and a tight convertor and it wont work to well.they spool slow and don't recover after a shift as well. better to under cam than over cam . jmho.
I see a lot of cars running these 230+duration cams. to me those are max effort open dump tube , big turbine wheel cams. they work good but ad a smaller turbine and a tight convertor and it wont work to well.they spool slow and don't recover after a shift as well. better to under cam than over cam . jmho.
Not sure on verter slip, I did measure back pressure it was 35psi at 20psi boost.
Its a 1.10 ar 88mm billet comp wheel with a 94/88 turbine 4 inch open dp.
Leaving on 3psi with the tbrake gets me a mid 1.4 60ft. I haven't tried more off the line but I think it could go 5psi with no wheel spin.
Its a 1.10 ar 88mm billet comp wheel with a 94/88 turbine 4 inch open dp.
Leaving on 3psi with the tbrake gets me a mid 1.4 60ft. I haven't tried more off the line but I think it could go 5psi with no wheel spin.
if that dyno graph is with a triple 12 cam there is no reason to run a bigger cam in most of these street engines unless they want to loose down low and add spool time.
I see a lot of cars running these 230+duration cams. to me those are max effort open dump tube , big turbine wheel cams. they work good but ad a smaller turbine and a tight convertor and it wont work to well.they spool slow and don't recover after a shift as well. better to under cam than over cam . jmho.
I see a lot of cars running these 230+duration cams. to me those are max effort open dump tube , big turbine wheel cams. they work good but ad a smaller turbine and a tight convertor and it wont work to well.they spool slow and don't recover after a shift as well. better to under cam than over cam . jmho.
Remember its not just the power curve but the limitations of the fuel you are using has to be taken into account. Some times a "bigger" cam or one with less DCR is needed to keep the engine from detonating to death.