yes all have been sent back to bullseye.. Well do some overlays on the 42r vs 72mm BW when we can dyno it next week..

 

I've been running the BW S372 for about 5 events now. I've made about 25 mid/low 9 second passes on it, and about 10 dyno pulls. I've gone both quicker and faster than i ever did with the GT4294. 9.19 @ 164 and 9.27 @ 167 on the S372.

I have my gates shut and it'll only make 46psi on my motor. Maybe you guys need to look into bigger cams and better cylinder head work to get the power you want without so much boost.

Also, how's the oil system on this car with the failures?

Just curious, because my turbo still looks brand new.

 

Im not going to comment on the failures til Bullseye tells me what they feel is the issue.. Im 99.9% sure its not oiling.. As far as better headwork and cams you know how honda heads flow and its very tough to compare to even a stock honda head.

Btw.. congrats on the times..

 

Thanks.

The only reason i brought up my car is to compare the boost levels. Have you tested much with different cams?

 

not yet we havent.. the issue i have is i dont want to custom tailor my setup around the turbo either.. the 4202 made 100whp more at a lower boost level than than the s372.. so if i changed cams or played some more with the head who is to say im going to yield 100more WHP with the BW and then what is going to happen when i put back the 4202?? am i going to make 900whp at 45psi or less now possibly..

 

Hey USP, what cams are you using in your car, if you don't mind me asking?????

 

jun 272's..

 

The 4202 is a bigger turbo, it should make 100whp more. The 4202 is capable of 1100whp, i've done it. The 372 is actually only about 70.8mm on the inducer, barely larger than the 4294.

I'm only trying to help, making more power at less boost is better all the way around.

I didn't read it all, but what were the details on the 372 (turbine housing and manifold) and on the 4202? I think i read that you changed the manifold setup with the 4202?

I have seen HUGE differences in power with different manifold/turbine a/r's. The common mistake everyone seems to make is a big compressor and choking the turbine size down too far because they're concerned with spool. Too small of an a/r will kill the VE of the engine and result in very high boost levels for the power being made.

Don't take any of this the wrong way, i'm not attacking you or telling you you're doing it wrong, just sharing what i've found in hopes of making your situation better in the future.

 

Trust me tony I will take any suggestions you have into consideration. I had a honda street car making 625whp in 2001 and i know how far you have come since that time as well.. I actually went with the s372 after reading your thread on HT.. I realize the s372 is smaller than the 4202 and i was running .90 a/r which may have been too small i am sure.. It was the 1st turbine housing i tried and we never got to try the 1.10 cause we were short on time..

 

what a/r is the 4202 now?

btw glad to see tony1 on here,congrats on the times!!

 

I bet that small turbine housing is what was killing you.

I went from the 1.01 to the 1.28 on the 4294 and saw considerably more power AND QUICKER SPOOL!! Not what you'd expect, huh? lol

I went with the 1.25 on the 372 right off the bat. I'm right at 1:1 pressure ratio at 46psi with that configuration and roughly 20psi exhaust backpressure at 30psi boost. I bet if you did the 1.10 or 1.25 you'd find that you would make the same power but at quite a bit less boost, and you might also find that you can get away with more aggressive camshafts. High backpressure and big cams don't play well together.

Are these turbos being used on a divided collector manifold?

 

If the .90 A/R housing was a divided type, it is too small for the application. If 900whp is the power target, I suggest 1.15 A/R for a divided housing.

 

from what ive read you made 802 at 44lbs on the s372 and then made 904 at 47lbs on the larger 4202...so im not sure why you keep saying you got 100whp more at less boost...sure at the same boost level you probably made more power but not 100whp more...also i was wondering what cft had to say when you went to their shop to change turbos..they claim to have told you to get oil from another source

quote"They where here @ our shop the weekend of the War of the Imports and we told them that they were getting the oil feed from the wrong spot!

The EVO's have Oil/Lubrication problem from where they are getting the oil feed, which is in front of the head. Thats the last place on those motor to get oil, we check on our "Eligal EVO" and on that spot @ high RPM gets about 30-35psi of oil pressure!!!
Everybody knows that @ 9,000+RPM and @ 40+psi NO turbo is going to hold with 30-35 psi of oil pressure!!! "

 

WHat about the Tial housings ? Would that help any ?

 

Yes the turbo was used on a divided collector manifold.. We will be trying out the larger a/r housings also with the 4202 and when i find out what the deal is at bullseye i may retest the 372 with a larger hotside as well..