Any reviews on the Borg Warner S372 on spool and durability over the GT42R?

The Borg Warner will spool only a couple of hundred rpms later and make more power and is easily rebuildable if you trash it out. The GT42R will spool slightly faster, make less power and costs almost as much as a new turbo to fix.

In the Honda world the Borg Warner S372 is the turbo to have. It seems to be the most popular turbo for the SFWD class (or whatever they call it now.)

I couldn't find anything on dsm's, but here is a graph for a honda.

Evans Tuning • View topic - Integra, Custom Kit, S372, 865whp/580tq, s300

You do not want either turbo on any street car, for a track car i would go with the s372 over the 42r any day, much cheaper too, no water lines to run either.

slowgsr said:

You do not want either turbo on any street car.

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< Journal bearing 4294 STREET CAR here. Dont even have a cage in the car for the sleeper effect.
Theres another guy on dsmtalk, not sure if hes on tuners. 4202r street car with a shep dogbox.

slowgsr said:

You do not want either turbo on any street car, for a track car i would go with the s372 over the 42r any day, much cheaper too, no water lines to run either.

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Yeah, that my conundrum going to an even bigger turbo. Right I have a built engine with the best turbo out there that gives power with an unbelievable spool rate, the HX40. When I tuning it it will have no problems doing 650hp or even topping off at 700hp. However, I have an addicted for power so I may go to an HX50, S368 or S372.

BTW, I confusing on the nonextended and extended tip housing. The price difference on it is $600. Is it really worth it?

No first hand experience but from what i've read, yes. The extended tip allows you to run super high boost, is more efficient, and makes the compressor wheel a decent size larger. I read it was developed for the compressor limitations on turbos for the new rules in drag racing so small displacement cars can compete.

1gDSM4g63 said:

Yeah, that my conundrum going to an even bigger turbo. Right I have a built engine with the best turbo out there that gives power with an unbelievable spool rate, the HX40. When I tuning it it will have no problems doing 650hp or even topping off at 700hp. However, I have an addicted for power so I may go to an HX50, S368 or S372.

BTW, I confusing on the nonextended and extended tip housing. The price difference on it is $600. Is it really worth it?

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The extended tip is the only reason to go with Bullseye turbo's in my opinion, its highly worth it.

The S366 T3 will make 700+ make mid 9 sec passes, and would be the biggest turbo that should ever be used on a practical street car. Now if its a 'drag' car you drive on the street than all the power to you, thats not what i was talking about.

As far as no cage, most tracks really push tech, and you can even begin to make use of that power anywhere if you have to do 1/8 mile runs or let off so you don't get booted.

I have friends with turbo's similar 42r's in street cars, none of them are 4 bangers though. RB26's or 2JZ's mostly.

372R is just badass though for a drag car, or a 'street driven' drag car. The characteristics of a S372 and 42R car cant be associated with a 'true' street car.

I don't know if I'd call it a Bullseye turbo, but I would definitely go with the extended tip wheel. That's the main advantage of going with a BW turbo. Getting that extra little bit of flow out of a "smaller" compressor wheel.

I have no experience with the S372. I'm running the S362, aiming for high/mid 10's. I think MAP has the S380 in there 4G powered FD. They've already made over 1000hp and hit low 9's, and should be dipping into the 8's this summer.

I'm going to be running a hx52 on my track car that will be driven on the street. Carver(1fastlaser) has a 2.4 so his car will be more streetable than others but I think that as long as it's not a everyday car and you don't mind waiting for the insanity than go for the 372. I think my turbo is the best of both worlds but of course I'm bias. It's just a tad smaller than the gt42 and s372 but is capable of 90lbs/min and is has a billet wheel just like the HTA t4z(which has the same wheel as the hx52).

Yeah, I've been thinking about the HX52 coming from the HX40, but there's not much info is out there about the spool rate, etc... I don't doubt it but I'm hesitant on testing it. I don't want to waste a huge chunk of change on that.

1gDSM4g63 said:

Yeah, I've been thinking about the HX52 coming from the HX40, but there's not much info is out there about the spool rate, etc... I don't doubt it but I'm hesitant on testing it. I don't want to waste a huge chunk of change on that.

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I got mine for less than my turbo manifold. They aren't a chunk

I know the Holsets are chump change, but I cannot throw anymore money out there. I don't even want to add up how much I've already spent on the car. Plus it's really hard to find the HX52 T4 housing, I believe the stock is T6.

If you can't throw any more money out there, why don't you try to max out the turbo you have first. Take it in steps. You'll learn more along the way. It's already a fairly large turbo.

One member ran the hx52 with his 2.0L motor. It spooled to 10ish psi by 4800rpms. Divided runner manifold with a t4 flange and stock holset twin scroll turbine housing (17cm^2 I think), if you interested in that route. It does not come with a t6 flange, but a flange close enough to a t4 bolt pattern that you can widen the holes of your t4 manifold to make it clamp down fine.

A twinscroll turbine housing with either turbo mentioned is the way to go for a semi-"street" car. But I wouldn't even try to street a 4cylinder with either.

EDIT: which gt42 are you talking about? As respects to compressors, the gt4202r flows more than the hx52, and nearly the same as the s372. The gt4294r flows less than an hx52 and s372. The hx55 flows more than those, but less than the s376. I don't know where you'd get one, though. I believe there is no gt4292r. . .

dsm-onster said:

If you can't throw any more money out there, why don't you try to max out the turbo you have first. Take it in steps.

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With a full built 2.0l DSM with a T3 HX40 69 lb/min what do you think it can put out?

Remember, the *small* bep housing hx40 did this with a stroker. Take it up in rpms. You have enough VE up top. The better the hotside flows, the lower the required boost to push the compressor to it's limit. You have enough turbo right now to merrit every single part you have in your build. And enough turbo to push your wally 255hp, if it's rewired, to about the limit. Which exhaust manifold do you have?

Turbonetics cast manifold, but I'll probably go to a tubular T3 it I choose to stay with the HX40. But what's the max. a rewire Wally 255lph can support whereas an inline Bosch w/ a Wally? I am going to this turbo to the limit when the I get stage 4 head and probably an ignition box and perhaps a fatter FMIC core if needed.

A rewired 255 can handle quite a bit. Especially when combined with a boost-a-pump. It should handle an HX40 pretty well. But the type of fuel you are running can have a big impact on the amount of power it can support. You running just standard pump gas, or E85?

Standard pump and race gas.

The intank walbro 255 flows 202 lph rewired at 35psi with a base fuel pressure of 43.5psi. See AMS flow testing. (202LPH X 1000cc) / 60min = 3367cc/min. This is not enough flow for 850cc injectors to max out at 100% idc. You need larger injectors than 850s for your hx40.

dsm-onster said:

The intank walbro 255 flows 202 lph rewired at 35psi with a base fuel pressure of 43.5psi. See AMS flow testing. (202LPH X 1000cc) / 60min = 3367cc/min. This is not enough flow for 850cc injectors to max out at 100% idc. You need larger injectors than 850s for your hx40.

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So should I get 1200cc or go all the way with 1600cc injectors?

You'd be cutting it close on E85, but since you're on pump/leaded race gas, then I don't forsee you running into any issues with 1200's.

Yea, 1200 with twin walbros should be fine.

Would a Walbro and Bosch work? Twin internal hangers is insanely expensive!

As you can see with the ams testing, the series pump system is good for keeping flow more linear at high boost but it does not add that much more flow at all.

Just a question related to Wallbro's...
What is the difference between:

Wallbro255 in tank, feeding Wallbro255 external/in series/.

Wallbro255 in tank, to external Wallbro255/parallel.

The second combo flows significantly more.