Turbo a good idea for auto-x/ road race?

[67goatman455]

First off i am building a 1967 GTO, the plan is to keep it as light as possible with the use of fiberglass parts, and having a reasonable 500hp. I have had it set in my mind to power it with a 5.3l LSx motor and a 70mm turbo. The setup is coming together slowly, but surely.

I have been second guessing myself lately though, i'm really worried about having turbo lag, or dramatic power increases and having the car be unpredictable in corners. I have been thinking about switching to a Pro-charger instead so the power is more on demand.

The other option is to just achieve my goal of 500hp on just the motor itself. What are your thoughts/experiences?

Thanks for any help!

[badmatt]

If your second guessing.

me personally all motor!

[67goatman455]

All motor would be the most obvious but i'm just hung up on the fun factor of a turbo plus its super cheap to build and easy to add more power if i need it

[clill]

I would do all motor or do a Eaton style supercharger.

[67goatman455]

Originally Posted by clill

I would do all motor or do a Eaton style supercharger.

an eaton style is going to heat soak really bad. not very good for a road course i dont think

[camcojb]

Originally Posted by 67goatman455

an eaton style is going to heat soak really bad. not very good for a road course i dont think

that would depend on how well engineered it is.

[67goatman455]

Originally Posted by camcojb

that would depend on how well engineered it is.

any recommendations/ experience with them? any help to some good answers is appreciated!

[SuperB70]

Turbo is great, just the damm lag and the heat load. And with just one turbo the drivebility is not so great on race applications. It more or less on/off. Softer power output by having two turbos.

Instead of useing Eaton, maeby you could use twin screw like Kenne bell, then build intake to house four Laminova intercoolers.

http://www.laminova.se/technology/intercooler

They are simply the best IC in the world.

I builded a big Hemi with a KB twin screw, blower factory told us that intercooler is not needed else than marine and tractorpulling applications.

But there is nothng wrong get your intake air temp down..

I'm currently playing with idea to build for laminova IC intake to my twin screw V10.

[GrabberGT]

Depending on your experience level and goals for the car, I'd say N/A. Autocross-wise, all the major players are N/A. Ridetech, DSE, Posi, Hobaugh, No-Limit... and with the exception of Maier (NASCAR 825hp) I think they are all relatively modest on power around 550hp. I think the important thing is to have a broad power band and a matching final gear ratio to get the most out of it.

Im still new to the game and learning how to use the little power I have 350-400. My last Autocross, I was drifting all over the place. Mine comes in late and my gearing leans towards hwy miles. It should be plenty for autocross though if I switch to a higher rear gear.

[Flash68]

Originally Posted by GrabberGT

Depending on your experience level and goals for the car, I'd say N/A. Autocross-wise, all the major players are N/A. Ridetech, DSE, Posi, Hobaugh, No-Limit... and with the exception of Maier (NASCAR 825hp) I think they are all relatively modest on power around 550hp. I think the important thing is to have a broad power band and a matching final gear ratio to get the most out of it.

Agreed on your last sentence.

Although most of those players you listed (with the exception of the No Limit truck) have quite a bit more than crank 550hp.