ChrisRX8PR

Hello guys.

First off, I have searched and found only one thread where it "pseudo" talks about the s372 (or s472 w T4 housing). I have found nothing on the GTK1000.

After deciding to call it quits last year on the 20b swap project, I am about to begin a Cosmo swap into my previous turbo Renesis RX-8 that reached 500whp+ (PT71GTQ billet 518whp @ 19psi). I don't really want much more power than I had, just about 550whp with the capability to make 650whp and while being more reliable than the renesis. The S372 falls in that range, also in that range is a GT42R and also in that range is a GTK1000.

Based on input from a few guys in PR that have had good experience with the GTK1000 I was going to go for it. I know its not that widely used on this forum but I figured I'd try it. For some reason I can't get the S372 out of my head. The only issue I have with the GTK is that its an open volute design and I worry about spool but my buddy said he is making a bar by 3800rpm which sounds great. He also makes about 600whp on the GTK.

Im on the fence between the S372 and the GTK 1000. I like that the S372 has a twin scroll housing in the rear but I don't know how spool will be. I want opinions from people that have either had one of the turbos or have dealt with cars that have. I am looking for power potential, spool range in X gear, whatever info I can get.

The engine will likely have a Large Streetport...I could be nudged into going bridgeport or half bridge (the renesis was bridgeported) but I know the hp range Im looking for is attainable on a streetport.

Sorry for the long post and thanks in advance.

Best regards,

Chris

ChrisRX8PR

Anybody??? :/

C

turbo10th

iTrader: (6)

Takes a little time for response but im kinda interested too. Seems most people are sticking with smaller t4 turbos or going all out with t6's. Myself im going t6 s472 with like a 1.0 a/r because from everyone i talk to t6 is the way go for alot of power(im shooting for 600+) and spool isnt too bad.

Trots*88TII-AE*

iTrader: (11)

If you're interested in the GTK1000, you should also consider some of Precision's line of turbos. Their turbos ending in 68 use the same exhaust wheel as the GTK1000, it's a 68mm "F1" trim turbine. You can also get divided T4 housings for those wheels, but they're a little more pricey than normal housings. I would price out the difference between a GTK1000 & something like the Precision billet 7168.

Nice thing about the BW's are that they are cheap and reliable. I don't have experience myself yet, but I have also been told the T6 is the way to go when pushing upwards of 600whp, even though it can be done on a T4 frame.

ChrisRX8PR

So I should get an S472 with a 83mm turbine but retain the T6 inlet?

About the PT turbos, I have good experience with them...where can I get divided housings for them? I have never seen it before...they also have the V Band housings now too...hmmm.

anyone else?

Chris

ChrisRX8PR

I just looked and a PT 7168 BB is 2300 bucks...I could get a GT42r for that...I think I will pass.

So Im back to GTK1000 or BW S372...

Thanks for the feedback.

Chris

ChrisRX8PR

Anybody?

:/

Chris

Alpha-7

iTrader: (1)

well what are you paying for the gtk1000 1800 bucks.. reason why people use bw turbos because they are a whole lot cheaper and proven. and they make crazy power

ChrisRX8PR

Im getting the GTK1000 for 1700.00 shipped from a friend that is a distributor...I can get the S372 from forcedinductions.com for about 599.00 plus 199.00 for the T4 housing, even with the housing its about half or less.

Im just wondering if the S372 will spool similar to the GTK1000 or not. What I dont want is to have crazy lag. (ie waiting until 5.5k rpm to get to 22-25psi)

Chris

ChrisRX8PR

If I were to go with the S372-472 w 83mm wheel, should I opt for the T4 housing or just keep it T6?

How will that affect spool?

C

arghx

iTrader: (3)

The GTK1000 is based on the Garrett T series. It appears to be a T-76 compressor wheel with a Q trim turbine wheel. I say that based on wheel specs for the GTK series found here: http://www.racetep.com/tnetgtk.html . It has a 76mm inducer wheel and a 68mm exducer turbine wheel, which corresponds to T-76 and Q trim respectively. see http://www.turbocharged.com/catalog/twheel.html and http://www.turbocharged.com/catalog/comp_wheels.html (you will have to convert to mm)

ChrisRX8PR

Oh, I was under the impression the F1 wheel from the GTK1000 was actually an S trim wheel...good to know.

What do you think about the whole S372-472(83mm turbine) T4 vs T6 housing argument?

Chris

arghx

iTrader: (3)

I don't have much experience with BW turbos so I don't have much to contribute on that point.

turbo10th

iTrader: (6)

Im going with a s472 with a 83mm wheel just not sure of the t6 ar think ima try 1.10 and see how it works if not ill just have to go bigger or smaller. Shooting for 600rwhp+

ChrisRX8PR

Im shooting for around that range too...

I think a S472 with the 83mm wheel and T4 housing is what everyone calls a S372, am I wrong?

I might try the .9 or 1.0 if I go this route...just don't know if T4 or T6...

Chris

ErnieT

iTrader: (2)

Porting, timing as well as type of fuel all play a role in how fast your turbo will spool.

turbo10th

iTrader: (6)

Yea t4 is s372 and t6 is s472. From what i been hearing t6 is the way to go, i really dont know and no one is done it people think im crazy, which i had all this when i said i was gonna go 10's lol. Ill try it and see what happens.

ChrisRX8PR

It will be running a large street/race port but I don't have plans for bridge although I could be swayed in that direction. Fuel is E-85.

Chris

ChrisRX8PR

Hmmm...I have seen how a S475 with T6 on 83mm turbine spools and its a bit laggy for me but that is a 75mm compressor and a T6 housing...Any one know how a S372 with T4 housing behaves on a streetport?

C

ErnieT

iTrader: (2)

Your going to make more power on a T6. Throw the idea of spool out of your brain. If you want 600+rwhp you'll need to live with 4800rpm and up. The Borg Warner will be your best bang for the buck. If your going to drive on the street alot, go with the 75mm or smaller. But at the end of the day, its all in what you can tollerate.

ChrisRX8PR

Ok, would you consider a S372/T4 1.00 with 83mm turbine, street-able? As in would the response be fairly quick or would it feel like a supra with a GT42-45r? For example, would 1st gear be usable at all? My 8 wasn't super laggy with a 71mm compressor, .96 open housing on Q trim with the Renesis...I would expect a divided manifold on a streetported RE/REW to spool faster that the Reni did on the same turbo. would the S372 compare to my old turbo in terms of spool?

Im slowly starting to lean towards the S372...

C

ChrisRX8PR

What would you recommend for 550whp from the BW lineup?

C

ErnieT

iTrader: (2)

Your questions are subjective. There is no right or wrong answer. Its on what you "deem" streetable. I can live with a GT45R under the hood cause I know if I mash the gas its gonna go, just gotta drop a gear lol. As for the turbo you mentioned, I dunno. I've never owned a BW turbo.

jsnow82

iTrader: (3)

I have a BW-S372 90ar. Its spools very nicely and low. I would not consider it laggy. When I had it at 20psi, I would see full boost around 4000rpm in 4th gear. I dont know anything on the other turbos you have mentioned. Im also running a 4 inch turbo back exhaust on a street port. Oh and all this on a manual boost controller.