dale5050

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!!

Pro Stock John

iTrader: (34)

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.

dale5050

I do not want to spin the motor past about 6800 rpms. The engine has a 4 inch Calles crank with standard length billet rods. The car will maintain a hydraulic lifter set up and will need to be run with PUMP GAS. I am from Las Vegas and the temp in the summer can reach 120 degrees--occasionally I will be sitting in traffic. The bottom line is that I want a set up that I am not continually having to adjust and tune and still can drive to work in the morning.

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!

Pro Stock John

iTrader: (34)

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.

Time2Kill

iTrader: (49)

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?

Earl H

iTrader: (1)

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.

Pro Stock John

iTrader: (34)

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.

Danny

iTrader: (16)

I was rec'd a cam with these specs

220/220 .560/.560 @ 114LS

The guy i spoke to said with a turbo cam you didn't need a lot of lift.
I'm not an expert but this is what was said to me.

Pro Stock John

iTrader: (34)

Terry @ Cam Motion might reccomend a cam like that if you were like 6-7 lbs of boost but not 15.

Earl H

iTrader: (1)

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.

Pro Stock John

iTrader: (34)

Thanks for sharing Earl.

Earl H

iTrader: (1)

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.

Pro Stock John

iTrader: (34)

I'm running a blower cam from them that I got from Futral...

230/237//115

Terry said if we go too big the turbo lag increases.

dale5050

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!

Time2Kill

iTrader: (49)

You want a smaller intake duration and a larger exhaust duration with a turbo.

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.

Jammer

iTrader: (1)

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.

Earl H

iTrader: (1)

Unfortunatley packaging constraints and the fact that my header is set up for a t4 housing prevent me from going to a larger turbo. Right now its a compromise that I have to make. I've been told (cant verify 'cause there isn't a compressor map available) that the PT76 GTS(1100FWHP) should do the job. It supposedly flows almost as well as a T88. This setup "should" make between 680-700rwhp @ 12 psi with good power under the curve. I'll know for sure in about a month.

KwikC5

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.

BOO HOO BRIAN

iTrader: (-10)

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........