guys check out this cam
Staging Lane
Joined: Sep 2004
Posts: 86
Likes: 0
From: logan utah
so you guys are saying bigger isnt better my cam i special ordered from lunati. it is 112lobe 286 intake and 296 exhaust duration at 585 lift. i am debating on a different one but they keep telling me that is the best.
Spools the turbo faster. Also the exhaust and intake overlap hurt the turbo... check the sticky for a better explanation on it.
what cam should i use with my turbo set up?
There is alot of debate here but first off the stock cam does pretty well. a higher lsa seems to be more desirable 114-117. this will bring the exhasut gas velocity up faster and spool the turbo more in the rpm range and not tend to bleed off boost. It needs to be matched to your setup also when you want the power to come on, and how high you plan on spinning your motor.
for the duration it needs to be matched to your engine size, intake and exhaust manafolds. The larger the engine the higher overall the duration should be. It was explained once to me that you want the intake duration larger then the exhaust that way you have a higher exhaust velocity which helps spin the turbo better.
Other theories have said that it depends on your headers, if you have a good flowing header that the exhaust duration should be greater then the
intake, if you have an inefficiant header that the exhaust duration should be lower then the intake duration. If you have a good intake and header set up they should be equal.
Id like to see specific testing so there could be definate answers.
what cam should i use with my turbo set up?
There is alot of debate here but first off the stock cam does pretty well. a higher lsa seems to be more desirable 114-117. this will bring the exhasut gas velocity up faster and spool the turbo more in the rpm range and not tend to bleed off boost. It needs to be matched to your setup also when you want the power to come on, and how high you plan on spinning your motor.
for the duration it needs to be matched to your engine size, intake and exhaust manafolds. The larger the engine the higher overall the duration should be. It was explained once to me that you want the intake duration larger then the exhaust that way you have a higher exhaust velocity which helps spin the turbo better.
Other theories have said that it depends on your headers, if you have a good flowing header that the exhaust duration should be greater then the
intake, if you have an inefficiant header that the exhaust duration should be lower then the intake duration. If you have a good intake and header set up they should be equal.
Id like to see specific testing so there could be definate answers.
The say that a reverse split is "better" for a turbocharged application because it doesn't cause reversion like a cam on a 112 or with a ridiculous split pattern with some massive exhaust duration. It makes complete sense to me... With a turbo, the flange is the smallest point in the exhaust system (other than the individual exhaust ports) and also the most restrictive. This in turn causes increased backpressure (this is why it is important to correctly size the AR on a turbo, ESPECIALLY on a rear mount). When you let the exhaust valve hang open while the intake is opening (overlap), which is great to bleed of cylinder pressure on an NA car, and excellent for higher rpm use, it hurts us turbo guys because the backpressure on the on exhaust side overcomes the pressure on the intake side (hotter gasses = more overall energy, more excited molecules) and contaminates the intake charge, which spikes temperatures, causes detonation, and overall sucks. Blower cars are different, they don't have that backpressure to worry about. That is why turbo cars have so much more torque (generally speaking) than blower cars, because of the increased backpressure. Hope that kind of helps...
Cam threads are confusing, because some folks are mostly concerned about peak dyno numbers. Others are mostly focused on having a strong track combo.
So if you were shooting for say 650rwhp,l which car would be faster, the 02 Z06 cam'd car, or say the 228/228/113 car?
So if you were shooting for say 650rwhp,l which car would be faster, the 02 Z06 cam'd car, or say the 228/228/113 car?
John has a good point. In all my cam choosing and recommending I go for a good performing combo, not a dyno champ. I have never even dynoed my car. I like to have a nice, broad powerband with some good response. I don't have a lot of turbo cam experience yet, but hopefully next year I will be able to experiment a little. I chose the Z06 cam because I know the powerband is close to what I want.
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Staging Lane
Joined: Sep 2004
Posts: 86
Likes: 0
From: logan utah
i have called alot of cam companies lunati comp crower and iski and they all say different things. 
i have never got two of them to be the same so it kind of confuses me. the cam i have runs and pulls to 7500 easy and dont try to stop. I put down 716 foot pounds of torque in third gear just looking for alittle more. i am rebuilding the motor this winter. thanks for all the input.
i have never got two of them to be the same so it kind of confuses me. the cam i have runs and pulls to 7500 easy and dont try to stop. I put down 716 foot pounds of torque in third gear just looking for alittle more. i am rebuilding the motor this winter. thanks for all the input. 
Originally Posted by 67Firebird455
That's the same cam I decided on. Sold my LT's and went with 01+ Manifolds and stock Y. Haven't run it yet, but I'm hoping between those changes it will spool the ***-mount better.
I wanted chopp with the turbo. I opted for the epp cam ground on XER lobes. It does chopp even on a 116. Spool on the rearmount is crazy fast even with the big turbo and wrapp exhaust
Mind u I have a 422 not sure what it will do for a 346. I think the z at epp had a 383 and pulled 617 through an auto with 13 psi on a stang dyno 
TECH Addict
Joined: Jul 2005
Posts: 2,153
Likes: 3
Turbo cams are all over the map. No one can tell me that a reverse split is better, single pattern is better, split is better, overlap is good, overlap is bad, LSA is good, or LSA is bad because no one has dyno tested these indepently. Those who have aren't talking.
For every car someone points out that makes good power with any type of cam, I can point out 3 that make power with something totally different.
I say reverse split cams are over-rated because Speed Inc. (I think) built a 370 LS1 with an 80 mm turbo that made 990+ rwhp on a 236/242-112 cam at 22 psi boost through an auto with a 5000+ stall converter.
My cam is 224/236-114 and I've run 143 mph in the quarter at 3750 lb on a 76mm turbo.
Buick GN's have been 9's using the stock cam, which is on a 106 LSA (look it up if you don't believe me).
The only thing people seem to agree on is that overlap is bad and I have evidence suggesting THAT isn't even true. Guys making 2000+ hp on cams with 40+ deg overlap @.050". Also, INTMD8 did some cam testing and every time he added overlap, it gained power.
And about the reverse split cams. . .they are mainly pushed by Cam Motion. They aren't nearly as knowledgable on turbo cams as most people think. Based on experience, several people, including myself and INTMD8, won't be buying any more Cam Motion cams.
Mike
For every car someone points out that makes good power with any type of cam, I can point out 3 that make power with something totally different.
I say reverse split cams are over-rated because Speed Inc. (I think) built a 370 LS1 with an 80 mm turbo that made 990+ rwhp on a 236/242-112 cam at 22 psi boost through an auto with a 5000+ stall converter.
My cam is 224/236-114 and I've run 143 mph in the quarter at 3750 lb on a 76mm turbo.
Buick GN's have been 9's using the stock cam, which is on a 106 LSA (look it up if you don't believe me).
The only thing people seem to agree on is that overlap is bad and I have evidence suggesting THAT isn't even true. Guys making 2000+ hp on cams with 40+ deg overlap @.050". Also, INTMD8 did some cam testing and every time he added overlap, it gained power.
And about the reverse split cams. . .they are mainly pushed by Cam Motion. They aren't nearly as knowledgable on turbo cams as most people think. Based on experience, several people, including myself and INTMD8, won't be buying any more Cam Motion cams.
Mike
I say run a single pattern.
But the reasoning behind the reverse splits, is to keep the exhaust duration LOWER, to reduce backpressure, at least that is one of the reasons.
LSA/ overlap will affect power under the curve and peak power. You typically can't have the highest peak power, and the best power under the curve. I picked the latter.
But the reasoning behind the reverse splits, is to keep the exhaust duration LOWER, to reduce backpressure, at least that is one of the reasons.
LSA/ overlap will affect power under the curve and peak power. You typically can't have the highest peak power, and the best power under the curve. I picked the latter.
Here's a soundclip of a 236/236 on a 112 LSA through an open y on an Incon system.
Sound
http://video.ls1tech.com/video/bf2a5...0800d0ccde.htm
It's the same cam that I made 421 rwhp N/A with. I just didn't feel like changing the cam right now.
Sound
http://video.ls1tech.com/video/bf2a5...0800d0ccde.htm
It's the same cam that I made 421 rwhp N/A with. I just didn't feel like changing the cam right now.
Originally Posted by MiaSSmaro98
firehawk but twins and single?how good does it spool?whats a single pattern cam?
i have gotten same run around from all the cam companies , nobody has a good solid answer. i have the TR Cheater cam
214/230 .601 .578 117lsa and my tuner says its a bad turbo cam but the car runs very strong , was considering going to the Z06 cam ,, what do you guys think should i leave well enough alone???
214/230 .601 .578 117lsa and my tuner says its a bad turbo cam but the car runs very strong , was considering going to the Z06 cam ,, what do you guys think should i leave well enough alone???