I am currently in the process of building a small block chevy (350) for my 69 Camaro and would like to install the STS Turbo system. I have been told that I need to run a turbo cam, heavier valve springs and dished pistons. I would like to fuel inject this critter and change to an HEI ignition. This is for a street application.

Now comes the fun part. Does anyone have any suggestions for the above components? I am using the original 69 64cc X heads rated at 350 hp, the original crank and have the motor bored 60 over. Any help would be appreciated.

Thank you

 

If you have a 69 Camaro, there's no reason you can't put the turbo under the hood, where it belongs. Tons of space. The 4th gen guys put the turbo's at the rear mainly becaus of lack of space under the hood.

 

Agreed, and even with the lack of space, it still belongs under the hood.

 

You can't post here you blowerless/turboless/engineless Camaro owner.

 

Dont go 60 over on the block unless you have to. In fact, if it has to go 60 over, I'd start with another block. You want the cylinder walls as thick as possible, especially with a boosted motor.

 

As much as I like my kit, I also would suggest putting it under the hood. Unless you are getting a ridiculous deal on the STS. I would have put mine under the hood if I had more room.

 

Ok guys, apparently you did not read my original post. I was not asking for opinions on my choice of induction. If anyone can tell me why (specifically) the STS system “sucks” and come up with a viable alternative that will keep air inlet temps down (without intercooling) and keep everything under the hood and give me enough room for the stock air conditioning system and give me enough room in the engine compartment so I can work on this thing without removing 200 pounds of bolt ons, I am listening. Be objective and back up your statements with facts not personal preferences. I thought that motorheads would be averse to all this drama crap. One more of my illusions of humanity blown.

Now, back to the meat of my question. What do I need to do to pistons, cam, springs to accommodate 8# of boost? Please keep in mind I would like to fuel inject this thing. I would also like suggestions on what fuel injection system to use and what HEI to use.

 

Jeez, man, this has been hashed out 1000 times, but I'll go through it once again. . .

A turbocharger is powered by exhaust heat and mass flow. The cooler the exhaust, the more mass flow will be required. This is simply accomplished by the wastegate pinching down and forcing more exhaust through the turbine. More exhaust through the turbine means more exhaust backpressure. More exhaust backpressure reduces engine power. Now, throw in the smaller turbine wheel and A/R required to reduce STS spool time, and the exhaust backpressure creeps up even higher.

In the rare back to back dyno test of STS versus front-mount, the front-mount made 50 more rwhp in the 450 rwhp range. The gap widened to 100 rwhp at higher boost/hp levels.

As for fitting it, GIVE ME A BREAK!!! I fit a single T-76 under the hood of my 4th gen, keeping the A/C, all accesories including cruise control, the stock cooling fans, and the stock radiator in the stock location. I can change my spark plugs in 45 minutes. I can have the heads off the engine in 6 hours. HAVE YOU SEEN UNDER THE HOOD OF A 4TH GEN??? You have easily 10 times more room than me.

As for your original question, use a cam around 220/220 - 114 LSA and you'll be fine. Set the spring pressure around 120 lb on the seat. As for pistons, TRW makes a 24 cc dish blower piston, but it's very heavy. SRP makes one also that's much lighter. I'd recommend the SRP's if you have $500 to spend.

Mike

 

Also 8# of boost is gonna need an intercooler regardless of where the turbo is mounted. And, nobody is saying the STS kits suck...I love my kit. But, front mounts are going to be more efficient. There's no way around that. It sounds like you haven't purchased your turbo kit yet...hence some folks just trying to help you make the most of your money.

 

As for the STS and intercooling... the pipes acting like an intercooler is BS. They certainly are not as effective as a proper intercooler. If you are wanting to avoid running an air-air or air-water setup, you could always go to an alky-water injection setup. They take up very little room, are fairly cheap, and can cool the intake charge very nicely. And also, all you need to find to refill it is windshield washer fluid (many kinds are 50/50 water/alcohol, which is perfect), and you can find it for 1$ per gallon, which amounts to nothing really when it comes to refilling it.

 

Preach on Brother Mike!!!
Seriously man with all the room under the hood of a 1st Gen there's no reason to go with that off the wall setup.
Steve...