Hi,
Hope you guys can help me out with some turbo questions. A friend and I are going to be swapping over his car from supercharged to turbocharged. He has a Sportmans block (stock 302 inches), Eagle swinging assembly, 9:1 compression. He already has Victor Jr heads, and a Holley intake. We made 603 RWHP with it, using a Novi supercharger at 14#’s of boost. He’s wanting to try a turbo now, so here’s where the questions start. We tried to do some searches here, and actually got more questions in our heads from it as we went along. Anyway, here goes.
From reading the boards here, it looks like the main turbo kit players are PTK, Turbo HP, and Turbo Technology. What company would you guys recommend, basing the decision first on quality of the kit, second, the availability (we don’t want to be building this thing in 2006, lol), customer service, and lastly, price.
Next up, power questions. We are looking for a semi-serious power output, like around 700 RWHP, and want to do a single turbo kit. What do you guys think is better, using a larger turbo with a smaller exhaust housing for street spool up, or using a smaller turbo with a bigger exhaust housing? I think a single PT 70 or similar turbo would get us where we want to be, but what do you guys think about this for a street car? What size exhaust housing? We’re thinking a .69 for street spool up, but will that get in the way of making the power we’re looking for? Anybody run this size turbo and have real world experience with it? Would we be better off using something smaller like a PT 66?
What about intake manifolds? We have a Holley intake that rocks in supercharged applications, does anyone use them in turbo apps? I’m actually thinking of using a Victor 5.0 on this, as I don’t think we need a long runner manifold with a turbo with how much torque they make. Thing is, we don’t know how the car will act off boost, and we don’t want a dog off boost. What’s the general concensus there, long runners or short?
What about cams? I see a lot of folks saying that the F cam works well with turbos. How much HP do you think the F cam can support? And what other off the shelf cams have worked for you guys in the past?
How are you guys doing your engine mgt? We've been using a Extender and a BTM with the supercharger, but what works best with a turbo? We were thinking about a PMS maybe.
Lastly, what about gears? We have 3.73’s in the car now, which I think will be too much. We’re thinking about going with a set of 3.27’s. Does that sound good? I’ve seen other cars that have moved to 3.08’s with a strong turbo motor too though. What are your thoughts there? The car has a Tremec in it.
I think that’s it for now. Sorry about the long post, just wanted to throw out all our questions at once. Thanks guys.
Jim
Hope you guys can help me out with some turbo questions. A friend and I are going to be swapping over his car from supercharged to turbocharged. He has a Sportmans block (stock 302 inches), Eagle swinging assembly, 9:1 compression. He already has Victor Jr heads, and a Holley intake. We made 603 RWHP with it, using a Novi supercharger at 14#’s of boost. He’s wanting to try a turbo now, so here’s where the questions start. We tried to do some searches here, and actually got more questions in our heads from it as we went along. Anyway, here goes.
From reading the boards here, it looks like the main turbo kit players are PTK, Turbo HP, and Turbo Technology. What company would you guys recommend, basing the decision first on quality of the kit, second, the availability (we don’t want to be building this thing in 2006, lol), customer service, and lastly, price.
Next up, power questions. We are looking for a semi-serious power output, like around 700 RWHP, and want to do a single turbo kit. What do you guys think is better, using a larger turbo with a smaller exhaust housing for street spool up, or using a smaller turbo with a bigger exhaust housing? I think a single PT 70 or similar turbo would get us where we want to be, but what do you guys think about this for a street car? What size exhaust housing? We’re thinking a .69 for street spool up, but will that get in the way of making the power we’re looking for? Anybody run this size turbo and have real world experience with it? Would we be better off using something smaller like a PT 66?
What about intake manifolds? We have a Holley intake that rocks in supercharged applications, does anyone use them in turbo apps? I’m actually thinking of using a Victor 5.0 on this, as I don’t think we need a long runner manifold with a turbo with how much torque they make. Thing is, we don’t know how the car will act off boost, and we don’t want a dog off boost. What’s the general concensus there, long runners or short?
What about cams? I see a lot of folks saying that the F cam works well with turbos. How much HP do you think the F cam can support? And what other off the shelf cams have worked for you guys in the past?
How are you guys doing your engine mgt? We've been using a Extender and a BTM with the supercharger, but what works best with a turbo? We were thinking about a PMS maybe.
Lastly, what about gears? We have 3.73’s in the car now, which I think will be too much. We’re thinking about going with a set of 3.27’s. Does that sound good? I’ve seen other cars that have moved to 3.08’s with a strong turbo motor too though. What are your thoughts there? The car has a Tremec in it.
I think that’s it for now. Sorry about the long post, just wanted to throw out all our questions at once. Thanks guys.
Jim