My tires are 275 street tires. I have about a 238/246 cam. (Big.) I have thought about putting in a different one friendlier for the street; but I would rather not have too.
The S-trim has an undersized pulley on it so it's spinning at 55k at 6k RPMs.

Topics for a different thread; but I'm wondering:
I have a PT-67 I got for a different project and never used. Has anyone ever heard of feeding a turbo into a supercharger? If the turbo was rated for say 500 hp but the sc and engine were up in RPM and trying to pull 700 hp worth of air, would the turbo be such a blockage so as to limit you to way below what you should make? Or would the two boost components be pretty much additive?
I also wonder if anyone has ever fed a T-76 sized turbo with a supercharger. Your SC air would be blasted out the exhaust into the turbo. Probably wouldn't be the way to go since exhaust gases are hot, so a smaller amount of moles of gas does a lot more, whereas the SC output isn't so hot so wouldn't be as effective mole for mole for spinning up the turbo. It would be awesome though if you could get a T-76 to kick on at 1500RPMs.

 

oh yeah, you are starting to talk

I have what you need right here
http://www.theturboforums.com/smf/in...40.0;topicseen

he has it working and loves it, there are few others on there doing it as well

 

That is sweet. That's what I'm all about; loads of torque everywhere. I'm going to start a new thread. I talked to a guy at work about it who's all into diesels. He said he'd seen an article where a guy with a diesel fed a supercharger into a turbo. Makes sense because the supercharged air will be going through the turbo, helping it spool faster (even though it's going through the intake side of the cold side instead of the small side of the exhaust side like it's designed to.)
We talked about how I have that PT-67 I could use to feed into the vortech, but the 67 is rated to about 550 I think, when the engine would be making 650 at least. Said if you get a turbo too small for your engine, the engine can be producing so much exhaust that it will cause the turbo to redline and eventually come apart; so I would have to put an external wastegate on the exhaust before the turbo to vent the exhaust before it hit the turbo to keep it from spinning too fast.
What I wonder is, how much of a restriction the turbo would be once the engine and vortech were trying to pull more than the turbo could push? Maybe not that much.
I also wondered what would happen if I got another MAF and Y'ed the turbo into the engine separate from the vortech. But what I'm almost sure would happen is for example if the turbo was making 5psi and the sc was only making 1, the boost would leak out the sc into atmosphere instead of going in the intake; and vice versa. I'd have to put a big valve in each intake path so air could only go in. I wonder about this kind of problem with twin turbos though because if each made 5 psi, making 10 in the intake, why wouldn't boost leak out one or the other turbo if each can only hold 5psi in front of it???
I want power down low, so I think I would rather use something smaller than a T76 so it will spool lower, but then the problem becomes the smaller turbo possibly being a blockage at higher RPMs and decreasing peak power, and that I probably wouldn't increase peak power at all.

 

I was wrong, the PT 6776 is rated for about 750 hp. It's been a long time since I looked at it.
I don't know if I would even want to keep the s-trim on there if I use the turbo. The s-trim now is being spun faster than it should be.