Turbo Cam for 408 Iron block 6.0L
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Hello:
I am going to have a T-76 turbo/kit installed soon and now I am trying to select a good turbo cam for my set up. The car will be driven daily and hopefully produce between 650-750 rwhp on about 15 lbs of boost. The bottom line is that I want this car to be built for street stoplight to stoplight racing and NOT TRACK ONLY. Below is the basic information, any cam suggestions that you have would be greatly appreciated with duration, lift and timing advance included.
2000 M6 TA
408 6.0l iron block stroker
forged internals with 8.5:1 compression pistons
6.0l heads with dual springs
If I've forgotten any important info please let me know.
Thanks a million!!
I am going to have a T-76 turbo/kit installed soon and now I am trying to select a good turbo cam for my set up. The car will be driven daily and hopefully produce between 650-750 rwhp on about 15 lbs of boost. The bottom line is that I want this car to be built for street stoplight to stoplight racing and NOT TRACK ONLY. Below is the basic information, any cam suggestions that you have would be greatly appreciated with duration, lift and timing advance included.
2000 M6 TA
408 6.0l iron block stroker
forged internals with 8.5:1 compression pistons
6.0l heads with dual springs
If I've forgotten any important info please let me know.
Thanks a million!!
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1) How high you are going to want to spin the engine?
2) What is the bore and stroke?
3) Hydraulic drivetrain?
4) Pump gas 650-750rwhp?
5) Will you be sitting in traffic?
6) What is your tolerance level for finicky setups?
These are the questions to consider.
2) What is the bore and stroke?
3) Hydraulic drivetrain?
4) Pump gas 650-750rwhp?
5) Will you be sitting in traffic?
6) What is your tolerance level for finicky setups?
These are the questions to consider.
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Originally Posted by Pro Stock John
1) How high you are going to want to spin the engine?
2) What is the bore and stroke?
3) Hydraulic drivetrain?
4) Pump gas 650-750rwhp?
5) Will you be sitting in traffic?
6) What is your tolerance level for finicky setups?
These are the questions to consider.
2) What is the bore and stroke?
3) Hydraulic drivetrain?
4) Pump gas 650-750rwhp?
5) Will you be sitting in traffic?
6) What is your tolerance level for finicky setups?
These are the questions to consider.
Did I cover everything? If not I will be more than happy to add additional info! I am spending so much cash on this set up already that I want to cry!
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I don't think I have seen a T4 series turbo peak higher than 6200 so far, so in all reality you might want to shift at 6500 or so because if you shift too high the car will nose over.
FWIW a 115 LSA will idle noticiably better than a 114.
FWIW a 115 LSA will idle noticiably better than a 114.
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I'm putting together my turbo setup also using a T-76 GTQ. Iron 6.0L block bored/stroked to 409 using 4.0 Eagle crank.
Running 9.0:1 compression. I'm also using the T-56 trans.
Aiming for about 700 to 750 hp on pump gas and alky injection.
I've talked to a few turbo shops, and they are all saying stick to ~220 to 224 on duration and .600+ on the lift on a 116 to 117 lsa.
You want to keep the duration down and the LSA tighter to avoid too much overlap on the valves, otherwise you'll be losing boost inside the cylinder.
What turbo kit are you using, or you getting a custom kit done?
Running 9.0:1 compression. I'm also using the T-56 trans.
Aiming for about 700 to 750 hp on pump gas and alky injection.
I've talked to a few turbo shops, and they are all saying stick to ~220 to 224 on duration and .600+ on the lift on a 116 to 117 lsa.
You want to keep the duration down and the LSA tighter to avoid too much overlap on the valves, otherwise you'll be losing boost inside the cylinder.
What turbo kit are you using, or you getting a custom kit done?
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I have a 422 setup coming together on an '03 Z06. I will be using a PT76 GTS turbo. I bought a cam through cammotion. I heard from many different places that they are the turbo cam experts. The specs that I rec'd were pretty interesting. There is a local Twin turbo'd C5 running low elevens/high tens on dr's with one of their cams. I will let you know how my setup turns out.
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I was talking to Terry W. @ Cam Motion and he basically, and I mean basically, that for a 400ci motor he would be looking at something like a 226/220... BUT that cams vary significantly based on the heads, and which turbo is being used and if it's a single or twin turbo setup. He said the downside of going to too big a cam will be the spool-up characteristics of the setup. He said for a lot of what we are doing a 6 degree split is good but he would tighten it up more depending on the power level you are trying to hi. He said he would go smaller that 226/220 to start (as a baseline) for a stock cube motor. He gave a few examples of competition cars that make 1500 and up to 2000 HP and the cams (solid rollers) are proportionately a lot smaller than supercharger cams.
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Recommendation for my setup:
Duration (intake/exaust): 228/223
Lift (intake/exaust) .574 (1.7)/.576 (1.7)
Lobe Center Separation: 115
Intake Centerline: 112
Comments PRICE: 385.00
I told him that I wanted a 6500rpm redline and about 12psi max boost.
Duration (intake/exaust): 228/223
Lift (intake/exaust) .574 (1.7)/.576 (1.7)
Lobe Center Separation: 115
Intake Centerline: 112
Comments PRICE: 385.00
I told him that I wanted a 6500rpm redline and about 12psi max boost.
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No problem...They provided the recommended specs for free, so given that their pricing was fairly competitive I ordered my cam thru them. Given what I've seen so far, I'm pretty confident that it'll do the job.
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Damn! Now I'm really confused! The local shop that does most of my engine work swears up and down that I am going to want something like a larger intake duration and smaller exhaust duration (ie 238/232) for a turbo vs. a supercharge due to something or another (he gave a long explanation that was beyond my mechanical abilities).
Yet, on the other hand a reputable sponsor on this site told me that I want a smaller intake duration than exhaust much like a blown application would use.
So which is it???? I am really lost now--kind of like a camel in the North Pole!
Yet, on the other hand a reputable sponsor on this site told me that I want a smaller intake duration than exhaust much like a blown application would use.
So which is it???? I am really lost now--kind of like a camel in the North Pole!
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Originally Posted by Earl H
I have a 422 setup coming together on an '03 Z06. I will be using a PT76 GTS turbo.
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Cam-Motion gave me two suggestions for my Twin set up...on a 409
agressive
231/226
.591 / .574
115 LCS
111 IC
medium
223/218
5.76 / 5.64
116
112
My issue is the same as mentioned above... just seems logical a larger exhaust duration would be in order. I have Jays best flowing stage 3 heads on order..but unsure which direction to ga cam wise.
agressive
231/226
.591 / .574
115 LCS
111 IC
medium
223/218
5.76 / 5.64
116
112
My issue is the same as mentioned above... just seems logical a larger exhaust duration would be in order. I have Jays best flowing stage 3 heads on order..but unsure which direction to ga cam wise.
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Originally Posted by eviltwins
Before you have all your parts for the setup, do yourself a favour and get a bigger turbo! A single T4 exhaust housing is going to cause a ton of backpressure on a 400+ inch motor.
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How's this sound:
234/228 610/597 114 + 2
My set up is an all forged, all bore 375 with twin BBGT 37's custom Hogan intake and lot's of other goodies.
234/228 610/597 114 + 2
My set up is an all forged, all bore 375 with twin BBGT 37's custom Hogan intake and lot's of other goodies.
Last edited by KwikC5; 03-06-2004 at 08:29 AM.
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Dale- if you give me a call i can narrow it down to the right cam for your car. 586-954-3181
Kwick.......thats around the correct specs for a turbo cam, except you want to flip the intake and exaust duration. . Turbo cars like a lot of lift and dont need that much in the way of duration. The want MORE exaust duration based on how well your exaust port flows. My street cam on my v6 is a 224/224 with 598 lift , on 112 seperation. As far as a "finiky" setup, with the smaller duration and lobe sep, they actully idle a drive better than other cams.
Earl, you will like the gts........
Kwick.......thats around the correct specs for a turbo cam, except you want to flip the intake and exaust duration. . Turbo cars like a lot of lift and dont need that much in the way of duration. The want MORE exaust duration based on how well your exaust port flows. My street cam on my v6 is a 224/224 with 598 lift , on 112 seperation. As far as a "finiky" setup, with the smaller duration and lobe sep, they actully idle a drive better than other cams.
Earl, you will like the gts........
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