thats what i figured, especially since the hta's use billet wheels and until the efr's borg warner didnt.

 

Actually, that's not true. BW has been using fully machined compressor wheels on OE applications for years and years if not for well over a decade.

Edit: I just researched some stuff. The BW K31 turbo comes with a billet compressor wheel and is used on the DDC (detroit diesel corporation) Series 60 engine, and that came out in 1992.

 

I dont want to sound critical... I say this cause I own both STI 9 and evo 9

Modified both aswell.... leave the STI as a road car and use a evo for circuit/track/racing

Subaru have the following problems:
Blowing head gaskets... only o-rings blocks with 14mm studs helps... this costs big $
Long headers make the response laggy and even more so on DBW
Cant take to much boost... 100mm bore 30psi will crack sleeves.
Cam Belt is to long... you get that the belt jumps... the pulley kit on the wrc car preventing this costs big big $
Cooling... I have spent $6000 to try keeping it cool...you also get cavitation on the water pump. gave up and bought a evo and a RX7
Blowby/crank case ventilation and oil flow from heads to sump. Because the boxer engine is flat... the oil does not want to return to the sump under cornering. The oil collects in the head... then start pushing out at the breathers and this cause alot of failures.
Then understeer... no matter the parts and caster you add on and and and... it does not want to stop... you get it less but never where it should be.

 

the build is already underway, and we have solutions for most of those problems
It will be dry sumped, i'll let him know about the cooling problems. Is that at high RPM?
A manual tensioner will be used, it's not going to be a street car.
My Tuner is working with a local machinist who racers these cars, so they have some tricks up their sleeves

Here are some pics

 

above 5500 rpm it becomes a problem... on my car anyway...and a friend,

I must also add that we are at 400ft aboves sea level and we see 30+ deg C day temps

Some race cars here run a nother rad at the back... using the Head heated connections.

If you can sovle the heat issue please let me know... you can be a HERO

 

Correct. Fun fact: Precision's original 71mm billet turbo used the K31 billet compressor. Turbo is pretty much unheard of in the Evo world, but lots of Supra guys used it.

 

have you tried an electric water pump?

 

We have tried the ron davies one, on one car... the egine overheated and packed in less that 100miles... but must add that this was due to a sleeve that dropped.
I bought 3 sleeved short blocks from the USA... all 3 dropped sleeves.

So yes, we will try again after the egine rebuild ... if it works I will be very very happy.

 

Is this order of spooling correct? (for the same/similar given exhaust housing options)

BW EFR 7670.. 64lb/m
HTA3582R....... 70-72lb/m ?
GTX3582R........ 75lb/m ?
GT3582R.......... 68lb/m
HTA3586R........ 75lb/m
BW EFR 8374.. 79lb/m
GT4088R......... 70lb/m
HTA3794R....... 90lb/m
GT4094R......... 81lb/m

It's so hard to get turbo choices made without solid numbers to back this up

Cheers, Mike

 

I would not expect a GTX35R to outspool a GT35R. If anything, I'd say it's probably comparable to an HTA3586.

Likewise, I'd suspect the BW 8374EFR outspools a GT40R when both turbine sides are similarly equipped. Fit the BW with an open turbine housing, and they may very well swap places in the table.

 

.83 singlescroll iwg 8374 is already appearing to outspool a standard .82 ewg 3582r.

http://forums.clubrsx.com/showthread.php?t=755332

 

also, a 4088r flows a lot more than 70 lb/min. the compressor map is incomplete.

 

If that's the case, then the twinscroll version would be impressive.

The 40R's 63.5mm inducer, 52 trim compressor should be around 75 lb/min.

 

Ok if thats the case...
How does this look

BW EFR 7670.. 64lb/m
HTA3582R....... 70-72lb/m ?
BW EFR 8374.. 79lb/m
GT3582R.......... 68lb/m
GTX3582R........ 75lb/m ?
HTA3586R........ 75lb/m
GT4088R......... 75lb/m
HTA3794R....... 90lb/m
GT4094R......... 81lb/m

 

here is some gtx testing in case you missed it. (doubt it!) i havent read much of it since im not really interested in them, but it should give you an idea with spool.

http://forums.nasioc.com/forums/show....php?t=2110277