Turbo sigma

[Nufie]

will a to4b with these spec be to big for a sigma?
60 exhaust 1.15 A/R

[mutlley]

Mate, a turbo with an exhaust housing with an AR of 1.15 will be pretty laggy. Mine was .96 and i was advised to go down a couple so i opted for an AR of .84

[Nufie]

no thats the inlet not the exhaust i think :S thats what the dude at gcg told me

[Stiggy]

by the way if you're running an astron 1 2.6 (rounded rocker cover) you'll have to get the magna inlet manifold modified to suit your head, unless you put an astron 2 head on it.

[Nufie]

im atm trying to figure out what injectors will fit in the sigma manifold so that will be a job and a half lol any sugestions?

[karl_2ltGC]

I just pulled the 2.6 from my galant today for a rebuild, already has magna head an magna efi gear. Got sigma turbo kit ready to go with stock turbo an wastegate.
I too am unsure about injectors. I am looking to make 150-200kw.
Anyone have any suggestions about a cam? Ive got a m9 magna head an a m6 tr head, just wondering wether the closed combustion chamber in the later head is the go...

[Galantman]

i have no flow bench figures or experience Karl, But when i was over at Rallyants place a few yrs back we had a look at one, and the valves seemed to be very shrouded looking and a have a lot of sharp edges that would be prone to hot spotting.
maybe you want to try it out and give us some info on how they perform in actual usage, Hint Hint

[karl_2ltGC]

yea i spoke to glen an he says different people have different opinions about it...

[Galantman]

sounds like the steel case/ alloy case celica gearbox stories all over again!