BoostedRex

Well where should I expect to get full boost by on a half bp engine with either the T04R or the T66? That is another consideration for me.

jspecracer7

your asking for a lot...streetability at one kilo on a BP engine, with top end pulling power and full boost with the lowest RPM's...

BoostedRex

I don't want the lowest spool. But I don't wanna wait until 4500rpm either. I am figuring that with a half bp I should be able to spool one of the bigger turbo's fairly quick though. I'm mainly asking what rpm range do you think I should expect the turbo to spool. I do ask alot of my 7's, but they always deliver. It just takes patience when building the car. With as nice as your car is, you know what I'm talking about.

IGY

Should be around 5000 on either turbo with the 1.15 P-trim or the 1.00 Q-trim exhaust side. I personally ran the 1.15 P-trim 67-1 (between a T66 and T70)on a secondary bridge and had no problems with spool up. I think if you are looking for power at lower boost I would go with the TO4R. The T72 won't make anymore power than the TO4R until higher boost levels. You are correct in your worry about the 35/40. Did you know that the TO4R and 35/40 have the same compressor side? The 35/40 is ball bearing and the exhaust side is more restrictive, read not what you want on a bridge.

BoostedRex

So the T04R with say a .84 A/R and a Q trim would be what I want or would I want to stay with a P trim even though I'm going to be half bp? I have always been told to go with a Q trim on heavy ported motors.

IGY

Believe me, 5000rpm's is not a problem. After you drive the bridge you will understand. The .84 Q is just going to choke the top end on the bridge. I would go with the Q-trim 1.00 for what you are shooting for. The only reason I went with P-trim is it was what I had. What do you rev to now 8000rpm, with the bridge there will be power till closer to 10,000rpm. I shifted at 10.5 in first, and 10 in every gear after, and it's going to want to go higher. You are not going to get 10yrs out of this motor if you drive it right. The bridge moves the power higher in the rpm range. I was reving to 10.5 with all stock seals and springs and no special clearancing or balancing. I also build my own motors, and if I blow one I just have to build another. If I was paying someone else to build my motor, there is no way I would run a bridge.

BoostedRex

A half bp was not my first choice, but it's going to be what I need to produce the power that I want. A large streetport would probably still not be enough to spool one of the bigger turbos the way it would need to be. As far as building the motor, I can rebuild my own without a problem. I just can't do the porting yet. As far as simply rebuilding an engine, I have no problems doing that. So IGY you're saying something like a T66 or T04R with a 1.00 A/R Q trim would be about right and would have no problems getting me to the 475 to 500 whp range?? I would love to hit higher numbers once I tune to 18-20 psi, but the 15-17 psi range is where I want those original numbers to come from.

GarageBoy

Innovative Turbo and Turbonetics can make you a BB T66 (or any turbo you want)

IGY

The TO4R only comes with a P-trim exhaust side, but can be changed to Q-trim. I would probably go with the T66 just because you can get ahold of one for cheaper than the TO4R.

BoostedRex

How can I get a hold of Innovative?? I'm thinking that a T66 would be the right choice as well IGY. And if i can get it as a BB unit it would be great! That turbo won't have any problems with boost between 12-22psi right? Also IGY, I need to pick that turbo up with a Q trim exhaust side right?



Edit: I also just noticed something from a long time ago. JSpec thought that this was going into my FC. It's not! It's going into an FD chassis. The FC is going to be my daily driver. I am building this FD to prove a point!! Plus I miss my old FD so I'm building this one to replace it.