Piggaz

Have a chat to Racepace about their revalved gear or Bilstien PSS9's. Don't be tempted by the BC junk (or the like) unless you don't like your kidneys or spine. Spending a little bit more here is worth it! Have a look at and consider replacing some of your bushes. At the end of the day it's a 20 year old car, the bushes are old and brittle. This is definitely something that is "gee, I didn't realise it was that bad" until you start changing them out. Rear subframe alloy collars is a good and cheap start.

On what fuel? On what engine? Run those turbo's on a diesel car, will you still get the same power?

Finally, some movement. A large chunk of the wiring side is done. With any luck, it should fire up Friday or early next week. Once fired it's just the tune to go!

Wouldn't it be healthier to run the 6466 with the current 1.00 rear? It's such a large snail, don't stick a cork up its ass and run the peanut 0.84. In AND out! Why is it "only" making 480 on 30 psi? Sounds kinda low given boost and turbo size. Possible issues/restrictions in the setup?

Look at the turbine wheel sizes. Bench marking turbo's on a horse power number is as useless as tits on a bull.

Having said that, GTR_JOEY ran 430 rwkw on a 2.6L using the NON C spec coppermix for years and never had an issue. Only 30 ish wkw difference between the above mentioned 3.0 and 3.2, torque difference is a lot more.

If you look up the turbine wheel size of a 2510, it's significantly smaller than a -9. Putting a compressor capable of flowing north of 40 lb/min (when in the original housing) being driven by a peanut rear isn't ideal for a goal of 350 kw. It screams mini 2540! Too much compressor, not enough hot side.

Dragging this back on topic, I think Dan (Lithium) is on the money here. A GTX 2860 flows just on what a pair of GT RS's do. Seeing that you goal is 600-650 whp, there is no need to go any larger than the 60 mm unit. Don't go putting the wheels where they don't belong (T25 housings). They never perform as well as GTX's in their original homes! GTR guys could learn something from the Gtst boys here ?. Yes it will mean playing with piping but if you're hell bent on staying twins, do it properly! Do yourself a favour though, put those stupid Tomei manifolds in the bin. They don't add anything over a set of tickled up stockers (I backed to back them years ago)... but won't crack! (I cracked two sets myself). 2863's and above need more turbine IMO. The side that no one ever seems to look at or consider. The compressor is only half the turbo. It has to get out too!

I think the 2.6/2.8 guys should be ok. I ran a coppermix for 10 years (35,000 kms), power ranging from 370 rwkw to 470rwkw/800 nm of twist. I pulled it out only after munching an OS gear set. The plates were just over half worn. It never slipped, never misbehaved and never refreshed or rebuilt. This was with OVER 350 big RPM launches under its belt. To replace it went an OS88 and an R3C. The driveability is on par to the coppermix. It's definitely NOT a lightswitch it's just the pickup point is lower compared to the high pickup of the coppermix. Apparently there was a design change with the OS R series of clutches at some point, not exactly sure when it was though. Some time before October 2014.

Intune and Nismo3.2ish both killed C spec coppermixes with the 8374. However, one is a 3.0 and the other is a 3.2. Pete's (the 3.2) nearly lasted a month. It's more the torque that kills clutches. You may be right behind a 2.6L.

What power are you shooting for with that setup?

What a nug ?

Of course. That's assuming the manifold is half decent ?.

Twin 38's would be ample! A few examples of twin 38's being used without any problems; - Ian's RB34/6466 and no problems running 12 psi - Intune's RB30/8374. -Nismo3.2ish's RB32/8374. Alot of guys run single 50 mm gates. They have an area of 1964mm2. Twin 38's have an area of 1134.5714 x 2 which is 2269mm2. Considering you want to run it "fairly hard", you won't be wasting a hell of a lot of gas, I can't see why you'd need anything larger than twin 38's.

Wasn't John's (bri73y) 6258/2.8 "all in" at 4700 rpm? @bri73y Might stuggle on a 2.6 IMO.

Colour close/matched?

Do you have any plans on putting a decent/hard actuator on it? 7 psi spring, no boost control and no timing would make anything drive as soft as a pensioners turd. When is it getting tuned properly?

Hurry up and finish the Subaru spinny cam upgrade!

In relation to what?

What size tyres do you plan on running to warrant a 11.0 inch wheel?

No rumble.

Based on a 305/30x18 tyre and comparing it to a 10.0+20 wheel wearing a 265/35x18 tyre. not quite sure how close you'll be to the suspension gear on the inside.

Pics of wheels?

Nahhhh. Every RB26 needs EJ25 cam actuators and cam parts in them! Especially right hand side intake parts!

Looks like the nose and drive from an EJ25 ?