Chaotic_FC

^tell me more about this!
does it show any advantages?

silvr94r2

iTrader: (3)

Looks like the race cover just get's rid of the anti-surge....we've been doing that for years with these things

Indian

iTrader: (1)

ok, so other than one having a t4 rear a/r and the other having either a t4 or t6 housing, what are the difference between the s372 and s472?

The s400 and s300 terms are used so freely its becoming confusing.

I spoke to mike in Miami (miketurboinc.com) and in our discussion he jumped from a 366 to a 472, so Im lost now.

Can some one clarify this?

The thing is, I know I can achieve 10's and make just under 600 with a s366 while staying under 25 psi(with supporting mods)... but what if I want to get more later on...

I dont want to come up short or have to boost 40+ psi to make anything more(exaggerating here), or am I underestimating the s366.. then he brings up the s472 and s474... so Im wondering what the hell happened to the s372/s374.

Edumacate me guys

turbotoaster

i got this from bill at bullseye, what are your thoughts on this, is he correct?

'If you are not familiar with it, the Race Cover Adds $308.00 to the turbo and will make between 50 and 100 hp at the wheels depending on the combination. It also drops back pressure while helping spool quicker'

so i said

'How does the cover drop back pressure, isnt that a larger rear a/r that only does that?'

he replied with

'Anytime you unshroud the compressor wheel you will lower back pressure, it outflows the factory pc.'

is he saying because the housing flows better the comp wheel has to work less hard to push the air out of the comp housing as ive never heard anything like this before

mono4lamar

iTrader: (32)

Nope, it still has the anti surge incorporated. You can't see it but it's still there right about a half inch from the compressor wheel. It's the best design yet, as it's the best of both worlds...

ScorpionT

iTrader: (3)

I think I explained it earlier in the thread. It really depends who you ask, because people use a couple ways of defining them.

S300 and S400 are different CHRA's. Some people base it off the turbine wheel, and some base it off T4 vs T6 housings. The way I would differentiate the S372 and S472 is: S372 would use the 83mm turbine wheel, and the S472 would use the 96mm turbine wheel.


To unshroud the wheel would be to take the cover off completely, dont follow Bill's explanation. The larger compressor doesnt reduce backpressure, it just increases cover airflow and efficiency. For example, the Precision billet turbos make loads of power, but to get the full potential, the larger H is needed. The S is simply not large enough to deal with the airflow.

Indian

iTrader: (1)

Thanks Scorpion T. Now all I have to do is find actual data on the s366 and s372 on rotarys to finally make up my mind..... what drama

ScorpionT

iTrader: (3)

No problem. What kind of data? I know someone with an S366 on his car, last time I heard it was running great. How much power are you shooting for, and what kind of use will the car see most often?

Indian

iTrader: (1)

Ok, heres the lay out. I was given the option of a s366 Rear a/r .90 or s472/4 rear a/r .84.

Im looking to go no more than 630-50ish whp tops at the track.Figure 450 is plenty for the street. The car will have an extended streetport and all other supporting mods.

It's a street/ drag car(more street(no highways, lots of round abouts, so drivabilty would be nice).
low 10's capable 9's are fine.( I know driver has alot to do with this part )
I just dont want a turbo that will not drop off up top, or a turbo that is a lag monster.
I dont want to boost past 30 psi either.
Im also wondering what spool up will be like on these two turbos.

Hope I wasnt too confusing. lol

ScorpionT

iTrader: (3)

Well, for your power goals, neither one is going to work. The standard S366 doesnt move enough air, and that .90 a/r wont be large enough. The S372/74 has enough compressor, I dont remember what turbine wheel goes with the .84, but if I remember, its not a big one(housing is also too small).

There is quite a difference between 450 and 600whp. An extended streetport will help spool, but you would still want the 72mm to be enough. There is a slightly smaller BW turbo that might work, but Im not positive if the turbine wheel would be enough.

mono4lamar

iTrader: (32)

Either a S372 or S374 will do the job. You'll need a 1.15 a/r on the turbine housing. If you want a really quick street car go with the S366xl. You'll be capable to make 600whp and spool up at a rapid rate.

I'm quite confident that the S366xl will be able to make more than 600whp with its improvements but if you really want to chase those horsepower gods go with the 72 or 74mm wheel...

Indian

iTrader: (1)

Thanks Guys for the input. Mono4lamar, what rear a/r do you recommend for the s366? do you think the .90 will be fine?

ScorpionT

iTrader: (3)

The S366XL was some turbo that Bullseye came up with for class racing, they dont make it anymore. It wasnt a good turbo from the start. Its also not capable of 600whp in a rotary.

mono4lamar

iTrader: (32)

Nothing personal, but I'm quite sure you're absolutely incorrect without some supporting data. I've seen at least one person on here that made 610whp on the s366. With access to the new cover that promotes airflow to the compressor I don't see anyone making any less power.

Again, nothing personal but if I'm wrong please give me some examples of how you think it's not a good setup...

Indian, I sent you a pm...

ScorpionT

iTrader: (3)

Well, if I remember correctly, the XL had a cut down inducer or possibly a reducer on the inlet. The standard S366 will make 600whp, yes. It should max out around 625-650whp, depending on the port style.