Precision Billet Turbos

[wolverine]

What manifold are you going to use?

[SimonR32]

Trust T4 divided

[wolverine]

Twin gate or are you going to merge the wastegate pipes to a big single?

[SimonR32]

2 in to 1, I'm still yet to be convinced that twin gates makes any difference, it's the same manifold as picture below...

[wolverine]

I have with the HKS cast manifold which has the wastegate sitting right on top. The very short run to the gate is the worst it can be if you want to keep both sides divorced. I am guessing there wouldn't be much in it once gasses start moving at any speed.

[tricstar]

Is that stainless ?? can't wait to get my stainless mani in favour of mild steel.... might be alright if it doesn't get too hot.

had heaps of issues with turbo to mani gaskets etc, and Grant at Per4manz turbos is pointing the finger at the stainless and turbo rear having different expansion rates...stainless is something like 10mm per 1m.

you might not be putting as much heat as the TO4 at near on 2bar, so might not have any issues...just saying (-:

[SimonR32]

Yeah it's stainless, will probably crack as well

Still it's a very nice manifold and it's a full kit so very easy to strap on and I'll give it a go, worst case is I replace it with 6-boost later on

[tricstar]

just re-read my post... first line was meant to say ;; can't wait to get RID of my stainless mani in favour of mild steel ( but I think you got the point )

but yeah, no harm in trying

[SimonR32]

Yeah I got what you meant...

Is yours china?

[tricstar]

I think so, but looks identical to that one. no cracks or anything, just trouble mantaining a good seal between turbo and mani, Grant thinks due to stainless flange against cast mild?? , had them both faced a couple of times, tried every type of gasket. The permeflex ( or whatever its call ) 5 layer one thats on know seems to be holding up, but hasn't seen too many long track sessions yet.. next time it lets go, its a 6-boob steam pipe or similar.

[PJ.]

Here's an in car skid vid from the 2012 Motive drag battle I did with the 6766 on 20-23psi.

[SilverECR33]

spewin got mine all ready to go, but tuner cant look at it till mid nov. *brakes*

[DVS JEZ]

Pffft PJ. Joels is slowly catching up. U too should race rules are no higher than 6000rpm hahaha

Just got his off the dyno, full boost 24psi @ 4300rpm revving to 7500 335kw

Will push for more boost soon. Had to take it for a run

[DVS JEZ]

As u can see having issue's with boost control. The manifold needs a bigger wastegate port. Had to raise to 24psi to get some form of stable boost

[SRS13]

E-Flex, that's E85 yeah?

Top end power is great but a little laggy? I'm reading 15psi@4250rpm, 20psi@4500 and 24psi at 5100rpm (all approx). Do you think these can be improved upon with better boost control? What size gate is on there now?

I've got a 5858 and was hoping for better response that that but not so sure now!!

[SimonR32]

Don't forget it's a 2L SR20 not a RB25

It's making at around 4300rpm which I wouldn't have thought is too bad at all

[Lithium]

I would have thought that is realistic/respectable for an SR20. Lag is as you'd expect somewhere between a GT3076R and a GT3582R.

[PJ.]

Great result that is on the money! Now time to race

[SRS13]

Don't forget it's a 2L SR20 not a RB25

It's making at around 4300rpm which I wouldn't have thought is too bad at all

Yes understand its a SR20 which is what I have.

The top end is sensational and a great result. Don't get me wrong, not meaning to be critical but would have hoped for more action a bit earlier.

In any case a dyno doesn't tell you how a car feels on the road.

Like I said I have a 5858 that is going onto a 2L (maybe a 2.2L) so am really interested in the response and power of these things. The slightly larger turbo should be able to make 350rwk or so. I guess I will find out later on.

[GTScotT]

I dont think the lag is as bad as it looks. You cant expect too much response from a 2L with a 300+kw turbo man.. For me its really on par and I think its a good result.