turbo options for stock port fd rx7
 

hey i was wondering if any of you guys can help with picking a turbo. i still a newb :nod: and don't know too much about turbos. i am wanting a quicker spooling turbo that compares to the twins for spooling time but don't want the turbo to choke up in the high rev range. im not looking for huge power or anything but i want a nice streetable setup maybe 10-12 psi and maybe around 300ish whp. let me know what you reccomend for turbo wise. i have a cxracing manifold, tial 44mm wastegate and still looking for parts like oil line, stuff like that so if you have any reccomendations to make the swap go better let me know.

thanks in advance
Riley

300hp @ 10-12 psi = a very small single turbo.

Im no pro on these things but i think a turbo that small in itself would choke you up top and you would be better served with something bigger and more efficient, even if you only want 300hp.

Get slightly bigger then you need, it will be more efficient, and you can always up the boost later if you get a good sized turbo.

From what I understand, you just will not be disappointed with a well sized single turbo and the lag will be a non issue. .

When i say well sized, you want the area of the turbine wheel to be about equal to the size of the compressor wheel. (see howard colemans turbo comparison thread on working out the area/relationship), and not too small, rotarys like large hot sides.

Im going with a twin scroll Borg Warner S360/S300 (the smallest of the BW S300's), for my responsive street setup. It will make much more than 300hp, but it should be responsive. My car has stock ports

Cheap: T04e, t04s (p-trim exhaust) even the BB versions are cheap
Fair: PT 5862, GT35R or a small Borg warner 300 series
Expansive: Borg warner EFR 7670

Alltou a Borg warner efr 8374 will also meet your demands and leave some room to grow

My first turbo was a BB T04S 60-1 with p-trim exhaust, it made 338 rwhp at 12psi on stock block s4 13bt and 384 at 15psi. Full boost at 3600, you have much bigger ports and higher compression so it will be even more responsive with your engine.Very nice turbo but old design and a BW efr would be so much more responsive and give you lots of tourque.
Choosing a smaller turbo then what i have listed would probably be counter productive with alot of backpreassure and heat choking you down. This is my experience, it is not pure facts :-)

I was looking at some borg warner ones what one would you recommend from tbe 300 series like th s360 or the s362 or something and does it matter that i have a open manifold but a twin scroll turbo?

Ideally you should get an open scroll turbo if you have an open scroll manifold.

It will work either way around i.e twin scroll turbo on open manifold and vice versa, but its just not ideal. Get the one with the housing that matches your manifold. From what iv read, it will make controlling boost much easier as well.

You can get the BW 300 series with both open & twin scroll turbine housings, so if you get one you should probably get an open scroll unless you plan to upgrade to a twin scroll setup in the near future. As mentioned, it will still work but its not ideal.

I got the BW S360, aka S300, aka bw8375, aka 177272, with a twin scroll housing. My understanding is its good for a tad under 500 rotary rwhp, or about 68lb/min of air, and is the smallest of the 300 series. I plan on running a nice conservative 400rwhp with it.

The S372 is good. I think it flows as much as the larger BW S366 but should spool a bit faster because, off the top of my head, it has a billet wheel (may be wrong, just what i remember).

Unless your goal has changed to really big power, then you don't need any of the bigger turbos in the bw 300 series range. They will only add lag and move your power band upwards.

The smallest is more than enough for lots more power then you were looking for. Goals change though!
In saying that, I have read many reports from people with the BW S366 that say its a great turbo and lag is not bad. It should be better then older tech similar sized turbo's anyway.

For me, the larger turbo's in the 300 series were simply way more turbo then i needed - so i went with the one that IMO would be best suited for my street application. I wanted a BW because of their good tech and OEM quality. I cant afford an EFR so that was not an option. That left me with BW300 series. All are quite a lot of turbo and can move some serious air, so bearing in mind my car is a street car the smallest one made sense.

I still don't have my setup installed so i have no first hand experience with how it actually goes, but i have scoured the internet for everything i could find over the last few months and im confident my research is on the money.

Be mindful, even the small S360 is physically quite a large turbo. I think all the turbos on the 300 series are physically the same size.

Airwerks 300 series turbos are quite laggy compared to the stock turbo, and even the smallest( S360) is a 450-525whp turbo.

Airwerks 7670 is the turbo you want with a .88 open volute. I made 302rwhp on one at 8 psi, and 440/450rwhp @ 22psi. All pump gas, and stock ports.

Borg Warner S200SX 7670

In an ideal world our EFR IWG kit is what you want;

BorgWarner EFR IWG FD3S Turbo System

Hey Turblown, just to confirm, the 7670 0.92a/r IWG kit would not require air pump removal??

Correct, but one has to be creative to fit an air filter. The lower bracket for the airpump needs to be refabbed as its in the way.

I run a garret GT37R turbo on a half bridge and spool at 4500 in first gear, and then the power continues all way through the rest of the gears in full boost! Pulls very hard as well.

Thanks :)

One turbo that hasn't been talked about in this thread but might be worth doing for your power goals is a precision 5862 or 5866. That should do well for your power requirements and should spool well. I would go with a T4 divided flange/housing with a hotside .84. This would be a fun sized turbo I would think with some good top end.

5862 is pretty close to the 7670, just a billet wheel. I have used two( 1 rotary, 1 2jz), and was never really impressed on the rotary.

5866 would be even less ideal for 300rwhp.

Iay just wait for now on the swap but maybe if someone posts a used like gt35 or to4s turbo kit i may pick it up then. It will be easier than building my own kit. So maybe in the next few month if anybody is selling their single turbo let me know and if not i may just go with a journal bearing t04s with a t4 .82 ar i wanna just go with a cheaper turbo that works haha but thanks for all the suggestions guys really appreciate it.