Im looking at getting one of these turbos. im trying to reach the 500-600hp mark at between 15-20psi. Im looking for advice on AR size and opinions on these two. I have searched and read many post and on the S366 turbo but not many on the s372. I have an s4 large street ported motor.

Thank You,
Jose

 

72 if you dont want a shitload of boost. get a housing around 1.00. i dont remember the exact sizes they offer on that turbine housing. let me know if you need to buy one of those turbos. ill help you out.

 

A S366 with a 1.10 a/r on a dual scroll manifold with twin wastegates made close to 490ish @18psi on a mustang dyno with water injection on a Gotham Stage 3 port.

If you want a sure bet to break 500-600rwhp under 20psi go with the S372.

 

so i take it that the s372 is not capable of alot of boost? im really trying to make it streetable with full boost by 4000rpms. im going to get a divided manifold and get a custom 4inch exhaust to help. i was told to get a .83AR housing, but i thought that was awfully low considering my large street port.

**dregg** im def looking into buying of those turbos

 

yeah the .83 A/R will choke it up top, especially with the higher boost levels you will need to get 500- 600 hp. stay with the 1.+ divided T4. For the high hp you want you will definitely be closer to 20+ psi then to 15.

The s372 is more then capable of ALOT of boost. it will actually handle higher boost levels better then the s366. But it will also make more power at lower boost levels, at the expense of increased lag.

I don't think the s372 will make full boost by 4000. The s366 might depending on your porting, exhaust, and tuning. Both are big turbos though so full boost by 4000 rpm might be asking a bit much. At least they are BB though that helps.

 

I would say go with a BW372. The S400 small frame coupled with a 72mm comp wheel and 83mm turbine flow pretty good. Its the same turbo as a GT4202. The GT4202 though does have a better turbine side.

 

so im really confused now, im told 83AR will choke up and now being told it will flow good. im looking at getting this guy within a few weeks. this is misleading.

 

Some people need to use better terminology... It means it will spool quickly (flow good), yet at 28-30lbs boost it will become restrictive (choke up top). I would really go with the s366 as you can readily spool up and still make 600whp. Most people can kill themselves with 400whp, so trust me that the 600whp will be one hell of a kick in the pants. Coupled with a good driver and the other "necessary" mods you should be able to run 10's.

 

i do not plan on running 30psi, maybe 25 on the track. my main goal is to produce great power on lower amounts of boost, have a good spool time and have a turbo that still breaths at higher rpms. if the .83AR housing will get me there, great!!! but why are ppl running 1.XXAR on roughly the same size turbos?

 

So they can run higher boost levels. Stick with the s366 as it will spool up faster and have full boost before 4k. You'll also never hit the "choke" on it .

 

you cant have everything. at some point you make a sacrifice. a 600 hp13b rotary doesnt spool intstantly. it takes a big turbo and high boost to get that kind of power. You will make more power on the larger A/R. it's just like running a bigger exhaust, there is less back pressure and more overall HP to be made. The smaller the A/R the more restriction there is but more pressure on the the exhaust blades to get the turbo moving. Small A/R: {x] Big A/R: [ X } <--- see how much more air can flow through?

Whether you run low boost or high boost you will still make more peak power with the larger A/R. The Higher boost you run, the more of a difference you will notice in power on the top end. You can feel it, like its just not pulling as much in the upper RPM's.

Those big turbos will take alot of exhaust to get moving. I really doubt you will have full boost on the BW372 by 4000 rpms. But you will make more power at lower boost levels with it. So this is where you have to make choice number 1. do you want to get more HP at a lower boost at a later time in the rpms? Or would you rather the turbo spooled faster but you required a higher PSI?

Picking the A/R is the same way. Do you want faster boost or more power?
For the amount of power you want i would not go below .96 a/r. But .96 isnt divided so you might as well go with a 1.06 divided or something. Provided you are running a divided manifold.

The comment you last made is an oxymoron. It's like saying i want to be tall and short. You cant have everything, you have to choose. Everyone wants a big turbo that instantly spools and never runs out of air. But that turbo doesnt exist.

My opinion is get the smaller turbo, make full use of your meth kit. Get a 1.06 or whatever exhaust a/r and plan on running close to 20 psi or more.

 

If you want something in the middle, go with the big BW366 with the larger 81mm turbine wheel and .91A/R with the T4. You can get them for less then a 1000 bucks.

 

Thanks to everyone so far on the input!

im definetly aware of this, hence why im trying to decide between these two turbos and what AR to get. i have seen good dyno results with the s366 but not too much informations on the s372. Im looking for a good spooling turbo around 4000-5000rpm, i just had a poor choice of words earlier, my apologies. I would like to stay out of +20Psi territory.

Only place i have seen these turbos are on the paradise racing website, where else can i find them with different options?

Im going to get the divided housing and tubular manifold and 4 inch exhaust to help with the spool and power. I want to atleast be able to make the 500hwhp within the 15-20psi boost range.

[QUOTE=Dudemaaanownsanrx7;8659582]you cant have everything.

 

I'm pretty sure the 366 will get you to the 500+ hp range between 15- 20 psi while spooling faster, But definately if you're willing to sacrifice spool speed for power at a lower boost level then go with the larger turbo. I just see the larger turbo as overkill and an unnecessary sacrifice in spool speed, but at the same time anything over 450 hp on a street car is also overkill.

 

If you're going to be using pump fuel and want 450+whp get some methanol injection. Make sure you use a good tuner for even 400whp.

 

[QUOTE=jsnow82;8660216]Thanks to everyone so far on the input!

im definetly aware of this, hence why im trying to decide between these two turbos and what AR to get. i have seen good dyno results with the s366 but not too much informations on the s372. Im looking for a good spooling turbo around 4000-5000rpm, i just had a poor choice of words earlier, my apologies. I would like to stay out of +20Psi territory.

Only place i have seen these turbos are on the paradise racing website, where else can i find them with different options?

Im going to get the divided housing and tubular manifold and 4 inch exhaust to help with the spool and power. I want to atleast be able to make the 500hwhp within the 15-20psi boost range.

Any of the diesel shops carry this unit that carry BW's. They are off the shelf units.

 

BW 372 is the way to go.

 

no its not how do you expect to beat those high hp supras on the street? not no 450hp

 

Well 450 hp rx7 will beat 90 % of anything that most people will come across. There will always be something faster out there. But regardless my point is once you're looking at running that much power you might as well go with something thats more pleasant to tote around town in with faster spool and just plan on running higher boost. And a 500 - 600 hp rx7 isn't going to beat a 900 hp supra either. Which is also overkill on the street. Though i'm sure its fun until you start breaking stuff all the time

 

yea its certainly fun

 

Yeah, he already got bored of being in the 420 - 430 rwhp region after only about 4-5 months or so with his bnr stage 4....

 

ha, just a little bored. any more opinions on this matter? I really want to get one of these turbos within the next few weeks. AR size for both? im being told that .83AR will fit beautifully on those specific turbos. very confusing

 

well i spoke with luis at paradise racing and he suggested the s372 with .90AR, should have full spool between 4-5000RPMS and capable of producing the power i want. Any objections??

 

I do.
Go full bridgeport and size the turbo accordingly, lol. That way you will have lots more torque across the entire powerband, well, except for light throttle below 2000 rpms or so.