Turbo cars.....

I think turbos are the the way to go to be honest, but I just don't like the snarl of pipe everywhere. It's just a little to cramped and busy for me.

If I could do it all over I would go turbo, but I just don't want to go back. I would run a 62mm or a 66mm.

I had mine on for fifteen minutes before it blew. but drivability was good felt like stock. Hopefully I will get it back this week or next. After that I will let you know how I like it.

Turbos are more effecient and adjustment in tuning is easier. I've always had better fuel mileage with a turbo, as you can drive around without being in boost all the time. The piping really isn't that bad if you take the time to plan out your setup. Biggest thing, the same with superchargers, prochargers, etc, is you gotta know what your engine is capable of before cranking up the boost and hoping for the best. You throw a big turbo onto a stock more and shoot for the stars, well your piston rods are going to be the only thing close to heaven.

+ Turbos do not add a parasitic load, unlike a supercharger
- They have to spool up and build boost where my Saleen is running 9.1 psi all the time

We've had two turbos on this car, first a 67mm...then the present 76mm... and planning on a much larger one The PH turbos produce more torque than horsepower which seems to be typical of a turbo setup.

The 67mm is a good size for a street car. With turbos, you have to size the thing for your specific application. I would not want a 76 on the car if it was still a street car. We were running 22 lbs of boost and the car hit 10 flat at 136 running like krap, shortly before built motor blew. Whole car is being rebuilt and I think we're going for 25+ lbs boost.

One advantage is that you can set different levels of boost at a turn of a switch. I will race the car at the lowest setting, while Lance will go for the gold at the highest setting.

As far as spooling up, sized correctly that is not an issue and I think the PH 67mm is good for about 650 rear wheel.

If you're truly worried about sppol time, there are ways of fixing this. As mentioned before, sizing the turbo to your application is the first step. After that, in a racing application, a shot of gas with the use of trans brake or line lock will eliminate spool time off the line. As far as eliminating spool time driving down the road, well if you have any with a V8, you simply messed something up building your engine. Like 05RedDevil said, a supercharger creates a constant load on the motor, which can be highly undesirable at times.

I'm trying to decide if I want to go supercharger or turbo. I just had my block bored and stroked (302 stroker) with all forged lower end and stainless valves up top. The car will see maybe 1 or 2 days a week street and the rest will be strip. What concerns are there with turbos in cold weather? My big concern is I want something reliable.

are you kidding? turbos love the cold! as far as reliability, it's pretty even play for both, just depends on the typical stuff....build, quality of parts, tune, etc

also how often are you driving this car?

This is a short vid showing a few launches off the transbrake. Setup correctly there is zero lag.

The car was pretty much street/strip at the beginning off the vid, running 10-12 lbs of boost on the 67mm. Middle of vid car is at 16 lbs of boost. Last few launches, car is at 22 lbs of boost on the 76mm and racing against some strip only vehicles.

Now car is being rebuilt and is really not streetable with 2 speed tranny and full spool.

video :: transbrake 11 to 22 lbs boost video by forensicsteve - Photobucket

Again not my car....but Thanks for all the replies. What is a good street turbo 62mm or 66mm? For the Hellion kit...

forensicsteve said:

This is a short vid showing a few launches off the transbrake. Setup correctly there is zero lag.

The car was pretty much street/strip at the beginning off the vid, running 10-12 lbs of boost on the 67mm. Middle of vid car is at 16 lbs of boost. Last few launches, car is at 22 lbs of boost on the 76mm and racing against some strip only vehicles.

Now car is being rebuilt and is really not streetable with 2 speed tranny and full spool.

video :: transbrake 11 to 22 lbs boost video by forensicsteve - Photobucket

Click to expand...

your car is probably the fastest s197 on this forum. Maybe one of the guys from jpc if they are on here, you have the 2nd fastest.

Damn, I'm pretty good.. I knew that you could of never made up your mind that easy.

^nasty its not my car......and I can't run a turbo....too much reselling and what not.

Gotcha, I was about to say..

turbo's kick ass... end of story... torque, topend all around.

once you select the right turbo for your situation, spool up isnt much of a problem

your a/r on the exhaust side is really the key... in a typical T4 open, and for a 4.6 engine, I would recommend a .81 in a stock-ish motor and a .96 in a "hotter" engine capable of a wide rpm range.

also, running a larger compressor than is needed (such as my case, NO reason I need a 78mm turbo on a 293cui motor) creates the same power at lower boost level.. reason? your flowing more air!! so, with that said, you can deduce that for a small motor, a small exhaust housing (not to small as this will be detrimental to TOPEND).

navy...why are you worried about the resale of a turbo car...a car doesn't go down in value cuz you change it to a turbo setup. i'm speaking from experience as i tend to buy and sell cars often as a hobby. turbo cars have spectacular resale!