What Size Of Pipe?.

[rockabilly]

hi guys on with parts for my rb30/26 rebuild using a gt35r 1.06 rear..

two questions. is 3" big enough bore for downpipe, and what bore of pipe would i make the wastgate pipe? 1.5" ok?. looking for arond 600-700 bhp @ the fly..bernie

Edited January 10, 2007 by rockabilly

[paulr33]

too small, try 4"

[gun32gtr]

i think on my vl turbo i had 1.5 or 2 inch for the wastegate screamer...

[2BNVS]

on my 26/30 i got 4 inch exhaust and 2 inch gate pipe

[GeeTR]

Hey Bud,

I'm running the same turbo. I would match the gate dump, to the gate valve? ie, 45mm = 1.8" (so 2")

I haven't found the turbine outlet diam, but figure ill expand it out to around 4" for connection to a metal'cat, then Trust PEII... so i can upgrade later on.

Hope this helps

Michael

[R31Nismoid]

4" off the turbo

and whatever the gate size, just continue on from whatever it is

[GeeTR]

4" off the turbo

and whatever the gate size, just continue on from whatever it is

Doesn't one need to flange it the same as the outlet.. then expand out to 4" within the first 3" of length?

... sorry just being picky in this 35+ heat

[rockabilly]

cheers guys thanks for the replies. just order my 4" tubing and 90 deg bends .....bernie

[Cubes]

Keep us posted with Pics.

[rockabilly]

cheers cubes your rb30 guide comes in handy..

here,s the spec.

rb30/26

extreme manifold, gt35r 1.06 turbo, 720 inj, d-jetro, jun 264/272 cams 9.7mm lift, cp forgies spool rods, acl bearings, n1 oil/water pumps, tomei 1.0 mm headgasket?. tomei sump baffle plus bits. hoping for 500 +ilbs torque and spooling from 3500rpm,s....

this is the old engine bay as is but soon to be replaced..25/30,s etc. 600 bhp/445 ilbs.

[Omurru]

what hardpipe kit you got?

[rockabilly]

greddy mate full induction

[rockabilly]

update all.. its on its way.. cheers leigh @ extreme.

http://www.calaisturbo.com.au/showthread.p...628#post1313628

[psi]

I've got a 45 turbonetics gate with a GT3040, and on 10psi, a 40mm pipe was too small. the boost kept on climbing! it now has a 50mm pipe and that solved that. if i were to do it again, i would fit a 55 just to be sure.

Dump pipe. No brainer, At least a 4inch! 4.5 if u can fit it!

[Pauly33GTS-t]

make sure the wastegate pipe isnt too long and thing = boost creep ive been told.

[rockabilly]

hi guys got a tail gate coming think it 45/48mm, from spool. so a 2" waste pipe and about 8" long b4 it joins the dump?. bernie.

[r33_racer]

Was that manifold made in UK or here in AUS?

Looks like a direct copy of Kyles manifold.

Also rule of thumb for wastegate pipe length is min 18"(450mm) before it rejoins the exhaust system, typically at the arse of a bend so the flow is heading in the same direction as the exhausts.

[rockabilly]

r33 racer. it an extreme manifold, made by leigh in good old oz....

http://calaisturbo.com.au/showthread.php?t=84707

[r33_racer]

yeh thats the bloke who copied kyles manifold and started undercutting him in price. Cant say much for blokes like that, but every area has these types of people.

Look for 6boost on calaisturbo also and you will see manifolds that are identical.