Infini IV

I have a couple questions regarding my final buildup of what I wanna refer to as the ultimate track-able, street legal FC ... (1990 Rx7 TurboII)

1) I plan to run a new turbo (currently running stock hotside with compressor side upgrade), with external wastegate and build my own SS tubular manifold. The thing is, I'm only shooting for 250-280rwhp at NO MORE than 12psi. I would like a turbo that is capable of holding that 12psi all the way to redline. At the same time, the turbo has to be MORE RESPONSIVE than the stock turbo. I will also need the turbo to come onto full boost asap assuming I can build a good enough manifold. Now, what is out there that can meet all of my requirements?

2) Are any stand-alone ECU's out there capable of driving all of the S5 13bt's emissions equipment? If not, I'm going with the stock ECU and SAFCII. I will need to run the entire emissions system like a brand-spankin new FC.

3) Is the stock INTERCOOLER CORE good enough for the power and boost I plan to run? If not, I will see if Spearco or anyone else has a more efficient core with the same dimensions. I will be running the intercooler as a top mount, but altering the angle the air will flow in and out of it so it won't be as heatsoaked as the stock one gets.

The engine (S5)... I am keeping the stock port size, except I will be cleaning it up some. I am building the engine for ULTIMATE RESPONSE. It will be hard to get the best response with all the other pulleys I will have (AC, PS, Air pump). It will only need to be strong enough to withstand 280-300hp at 12psi, so I have a good idea of what I'd like to do.

When I am done, I want the entire engine bay to look as if it came out of the Mazda factory in 1990 (with the exception of an aluminum radiator and the wierd angle at which my intercooler will be). All the emissions equipment will be intact, and in full working order. The stock airbox will be in place (although custom worked over to accomodate a cone filter inside of it), and of course, the TID will be a nice piece.

The exhaust will be a full 2.5inch system. The wastegate will be open vented (haha I know). On the downpipe, I will weld what looks like the shell of the precat onto the piping, so airflow right out of the turbine will not be disturbed. I will have a brand new, stock catalytic convertor. Then a y-pipe that splits into dual 2.5 inch piping and then into 2 straight through titanium mufflers. It will be almost as restrictive a system as a stock FC, but nice, quiet, and will pass CA smog.

Infini IV

Any ideas?

Barwick

um.. if you want it responsive, you can work an afterburner type setup like they do on rally cars. But I don't think you're going to have something that holds full boost all the way to redline AND is more responsive than stock.

And why emissions equipment? The socialists in California forcing you to have it on still?

Cheers!

hrm... i would maybe consider HKS PFCON with safc for fine tuning. 680cc injectors all the way around. Or maybe get your stock ECU remapped for timming and fuel.

I would also try stock turbo with a different exhaust housing as well.

I would also suggest water injection. I know some people on this forum don't like it. But hey... it works. Though i'm not using it but time will come when i will.

As for the exhaust, You will need full 3 inch system.

dvls-7

doubt you will find one with a quicker response than stock. You can try a BNR setup, that should be able to hold the boost, but that depends on the manifold setup. Racing Beat makes a full 3" setup from dp to end pans, which has a look of stock and its sound is nice.

Infini IV

Hmm, so I guess my best bet is to stick with the stock hotside and just upgrade compressor side. If that's the case, then what compressor wheel and housing would work well with what I'm looking for?

Can the stock turbo manifold be improved upon? Whenever I look at the stock manifold, I get a feeling that a better turbular one would work out better... dunno why...


Yea, if you're on TeamFc3s as well, I'm waiting for member "Henrik" to see what more he can come up with regarding the stock ECU. If he can, in the near future, I'd like to send him my ECU and see what he can do...

Hmm, try a different exhaust housing? Or do you mean different compressor housing?

I'm not much a fan of water injection either, mainly because I'm not aiming to run over 12 psi of boost. And, I don't want to risk the chance of forgetting to get more water...

I'm curious as to why I would need a full 3 inch system? Are my power goals really that hard to reach with a 2.5inch fully-catted system?


Hmm, I'm considering some type of compressor upgrade... But like I said above, I think the stock turbo manifold can be improved upon.

As for the exhaust, I don't want the RB setup because it weighs a good 80lbs or so. I'd like something much lighter and something with a cat ($5000 fine plus a lotta trouble later in CA if caught without a cat).

Infini IV

Bumpu

Infini IV

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Infini IV

carx7

iTrader: (31)

You are not going to get another turbo that spools better than stock and looks stock. You could get a full T04... like a T04 E that would spool very quickly. I think you will find that the stock exhaust is EXTREMELY restrictive.

The problem I see is that to make 280HP you are pushing a fair amount of air. Doing this through a stock turbine manifold will increase back pressure as will that restrictive exhaust. Too much back pressure can overwork the entire system, and can be harsh on your car. I would try to work a 3" DP if possible, though I'd imagine it can be done on 2.5.

As for a hybrid compressor talk to Bryan at BNR. I've never purchased from him, but the conversations I have had with him impressed me. Probably an H3 wheels is your best bet IMO for that power. This will be bigger than stock though, and from what I've heard about the Smog ***** out there it will be noticed.

-Chris

Infini IV

Thanks for some interesting info. The reason I wouldn't want to stick with a hybrid turbo is precisely what you mentioned about overworking the system, therefore creating more unnecessary heat. I actually don't mind anything that doesn't look stock in regards to the turbo...

As for the turbo, I was actually looking at the T04B H trim wheel from the Turbonetics site. I don't know anything about this turbo, but from looking at the compressor map, it looks alright for what I would be asking of it. Would this be better than any of the T04E's? Which T04E would you suggest, if not? What about the turbine side... Would a 1.00 AR, tang/divided with O trim wheel work well?

You have definately convinced me to work out a full 3inch exhaust system though. I guess I could copy RB's turbo-back setup with a cat in place of their silencer, and with lighter mufflers... But I was originally going to have a free-flowing DP as well... just that I'd have a shell of a precat to look like it has a precat.

And thanks again for trying to help me.