Anchor

K, so what have you chaps done for manifolds? Keep in mind i'm using a GT35r or the Turbonetics equivelant. Haven't made up my mind yet.. Can get a 35r locally with warranty for $1600..
Also aiming for around the 500rwhp mark..

Intake i'm tossing up between JMF Race and Magnus Motorsports Street..

JMF - $593 USD.



Magnus Motorsports - $600 USD.



There's also a few others out there... But both of these come in a RWD application for no extra cost.


In ways of exhaust manifolds i want something decent. But don't want to pay around $1400 for a custom manifold.
So i'm going to buy a FWD one, extend the runners from the plate and flip it upside down. Add in some bracing and shazam.. I hope..

Got a mate whos an awesome welder with everything. And he likes beer :beer

Dark Performance - $480 USD.



Straight Line Specialties - $845USD.



DN Performance - $574 USD.




Ideas, past experiences etc etc please..

81 GH sigma, 4g63 stroker, tc conversion


I bought it in 08 sometime with a 2L with forged pistons. Was running rough then it let go. So i went stroker.

'81 GH Sigma


Engine:
MPI G63BT 2.0 Single Cam

Exhaust:
3" Stainless from Exhaust Housing to 3'' Magnaflow Muffler, 3" exits out the back

Suspension:
Monroe Shocks, Kings Springs, Nolethane Bushes

Wheels:
1981 Spec Polished Peter Wherrett Specials with Whitewalls (+5 PWS's out the back.)

Modifications:
4g64 crank
Eagle Rods
Forged CP Stroker pistons. +040
Autronic SMC 1.4v Management with 1.9 chip
Twin MSD V6 Commodore Coils and Twin Ignitors
Turbosmart Plumb Back BOV 38mm
FMIC hidden and painted black with Polished Piping
VN Throttlebody
Custom Inlet Plenum
560cc Evo 7 Injectors
Bosch 044 fuel pump, surge tank, secondary pump.
Custom Highmount Steampipe Manifold (heatwrapped)
Garrett GT3076r BB Turbo 0.63 Rear Housing
Full 3" Stainless Exhaust with deleted Screamer Pipe
50mm Trust External Gate
Oil Cooler painted same colour as car
Braided Lines & Speedflow Fittings for All Fuel & Engine Oil Lines
Hydraulic Clutch Conversion
Custom NPC Button Clutch. Ceramic. In or Out haha..
JAP 5 Speed
Custom Tailshaft
Mitsubishi Scorpion Disc Brake Diff with 3.3 gears. CIG Locker
Autometer Oil Pressure & Boost Guage
ARP Head stud kit
Double valve springs
Ported and polished head
3mm oversized exhaust valves
Custom surecam camshaft to suit stroker
Cometic Head Gasket
Custom catch can setup.


Stereo Audio / Visual:
Clarion source Unit
JVC 6" Fronts


Proven Power:
296rwhp on 11psi. 340rwhp on 16psi with the SOHC setup. Run in tune. Then it let go at powercruise and we still don't fking know why.. Tested everything, no joke.













This is what happened at PC Brisbane.
http://i25.photobuck...0/Photo0254.jpg


So now i've sold the 3076r. Got a NA bigport VR4 head. Either going with some BC 288 cams or getting some custom ones made from surecam. Go for a bit over 300 duration.
Putting girdles in the block. Have a holset HX40w available but i might just get a GT3582r so its a little bit streetable.
Tossing up between the JMF rwd manifold or the Magnus Motorsports rwd manifold..

End goal - mid 500rwhp on 26ish psi.

Zoom want the car for a full feature, so i gotta get my ass into gear


Comments, etc welcome

Just joined, been round a few forums. Going twincam so i thought it necesary to join up here.

Bit of background, i own a 81 GH Sigma. Some know it as the Cashmere Assasin from down south, others call it the Pigma around the brisbane area.

Basically i made 340rwhp @ 16psi on a 4g63 SOHC stroker. Something went uh oh and i have now decided to go twincam.

I'll post up a full members rides soon but for now you can find everything here --> http://forums.austar...opic.php?t=1155

4g63 block
4g64 crank
Eagle rods
CP stroker pistons
VR4 bigport head
Surecam custom cams being made (around the 288ish mark i'm told)
Magnus RWD inlet manifold - to come from states
custom exh mani
Turbo was a gt3076r. Gunna go bigger..

Gotta get it finished.... Again.... Zoom are on my back about a feature and some photos.


This is also a statement to a Staz 5 speed and welded scorp diff.. Hasn't broken yet haha...

Car



Old motor before going in sept 09.



Motor in