Turbo cam and limit on forged internals

Right now I have a 355 heads/cam rx7 and im considering boost again. This is 2 bolt main block. To help with traction I plan on running a t4 t76 .96 ar turbo. I am having trouble figuring out wht duration, lsa people are running. I will have forged crank, forged rods and forged pistons. What size cold side tubing? How much boost could I run safely with a 9.6 to 1 compression ratio and 91 octane (possible meth injection if necessary). What horsepower level would this get me to and what size of injectors would I need to safely support it? I have a walbro 255, will that be enough? So many questions but if you have an answer to any of them I would be glad to hear them. Thanks a lot.





;

IDK how a T4 turbo is related to traction, but ook.

I think my cam is a 112-114 area LSA.

Cold side is just whatever the turbo comp outlet is and match what the TB inlet is. Just don't go huge.

Whatever PSI/timing it starts to knock, back off, not much else you can predict. I would say 10-15psi area.

80# will run out pretty quickly if you are on stock LT1 rail pressure, and no, the 255 will not cut it. You need two of em at least. I would say the 80# will be more than plenty though.

Quote:

---

Originally Posted by shownomercy

IDK how a T4 turbo is related to traction, but ook.

I think my cam is a 112-114 area LSA.

Cold side is just whatever the turbo comp outlet is and match what the TB inlet is. Just don't go huge.

Whatever PSI/timing it starts to knock, back off, not much else you can predict. I would say 10-15psi area.

80# will run out pretty quickly if you are on stock LT1 rail pressure, and no, the 255 will not cut it. You need two of em at least. I would say the 80# will be more than plenty though.

---

T4 no but .96 ar so boost isn't immediate. I have a fuel pressure regulator I can up the pressure. Where would you start timing at?

Yea, T4 76mm .96ar is a tiny turbo, you may be saved since you have a 355 but thats gonna hit hard and fast.

timing I won't speculate on, thats a tuners job

Would you suggest a larger turbo then? I don't plan on running more than 12-15psi even with meth injection, but id like to have room to grow some. Also what duration would you go for?

on my 355 Futural recommended me a 226/226 on a 114... cars not running yet so cant tell ya how well it works out.

@Ryan Stout would that cam I bought off of you work for him?

A larger turbo will be laggy and allow better "traction" before it lights off.

But, that seems asinine to me, run the small turbo and enjoy the response time.

LE 224/224 .570/.570 114 lsa is what I've got sitting. I'll never get to build a turbo engine....

Quote:

---

Originally Posted by shownomercy

A larger turbo will be laggy and allow better "traction" before it lights off.

But, that seems asinine to me, run the small turbo and enjoy the response time.

---

Thank you, I think that turbo would be appropriate for my goals.
Is there a certain ideal lift for a turbo car?