TurboAv

iTrader: (6)

I found a local shop that is going to build me a single turbo kit for my 05 GTO and I would like to keep the cam that's in it. It's a 242/248 .621/.615 on a 111. I know the conventional wisdom says grind it on a 114+ for a turbo, but I've run aircooled VW turbo setups that were ground on a 109-110 and they absolutely screamed.

What gives?

ninetres

iTrader: (35)

That cam has a TON of over lap. Of course you COULD run it.......but why? If you are going to spend the $1,000s of dollars on a turbo set-up and dozens of hours on labor......why not just swap in a more appropriate cam?

deuce_454

i would preforably install a custom grind, but if you dont want to spend a fortune a GM ls6 or the ls9 cam that is out now should work just fine..

turbo'd stang

Conventional wisodom stops people from trying new things. Give it a try. You never know, you might stumble across something new....to you

ls1290

iTrader: (20)

It can be used, but between the LSA and the overlap from the large durations you are going to be bleeding off a good amount of boost in the last part of the exhaust stroke. Since a cam swap on the LSx motor is fairly painless, I would swap out the cam.

Mike@Diablosport

iTrader: (2)

Amen to that.

Here's the results from a TT setup we tuned that everyone said would not work due to the cam not being 'correct' for a turbo car.
https://ls1tech.com/forums/dynamomet...ottom-end.html
Could it have maybe made more power with a different cam, well maybe, but check the numbers, there was no shortage of power anywhere.

As it sits right now, that car is running a cam not designed for a turbo set up, and to make it more 'unconventional', he is running 2.73 gears out back, and the cam is recommended for 3.73-4.10 gears optimally....

TurboAv

iTrader: (6)

Reading that post it mentioned the overlap helping the stock bottom end survive. I think I will try it out. The worst that happens is it doesn't work and I have to get a new cam. The other thing I was thinking was due to the overlap the power won't really come on until the higher rpms. Which doesn't bother me since it's primarily going to be a drag car and I can match the converter to the combo.

Shoaf85

iTrader: (9)

Go for it man. I have a TSP torquer 3 (231/234 .643"/.598" 112 LSA) cam in my car with patriot stage II's and on 6 psi it made 590rwhp on a mustang dyno w/ a TC76! Through a six speed of course and I am only revving it to 6,000 to save the motor. The power curve doesn't look typical of a turbo car because the power and torque keep on climbing all the way to redline!

ninetres

iTrader: (35)

Your cam and the TRAk cam have FAR less overlap than the cam the origional poster has.

TurboAv

iTrader: (6)

The way the shop is going to do the kit it won't be much of an issue at all to swap the cam once the kit is in and running. If it sucks, I'll change it. It will most likely suck, but I'm a curious kind of person and I want to see what it will do with the current cam and with a different one. That way I can post up and tell everybody about my experiences with a non-optimal big overlap cam, and one that a sponsor specs out for me.

calongo_SS

iTrader: (7)

I say try it. it may surprise you, worst case it won't and you'll have to swap it out.

Grr

iTrader: (2)

sure the cam is going to give up alot down low, but i am willing to bet that it will make a rediculous amount of power 5k and up. I have also run big N/A cams with boost and they always make more power than anyone beleives

TurboAv

iTrader: (6)

Like I mentioned previously, the other turbo experience I have is with aircooled VW's. We always ran huge durations and overlap. The power hit around 4000-4500 and we shifted at 8000. With the correct converter setup I really won't care if I'm loosing anything less than 4000rpm.