Turbo(s) for 2.8 I6
 

:)

I was thinking of running two turbos on the straight six, I can pick up two ihi rhb5's (one from a ford and the other a mazda) for dirt cheap, but I'm figuring those might be too small for this engine. This is the Toyota Supra 5M I'm talking about. Any better ideas? Twin might be more of a hassle than I'd like to tackle anyways, so I'm looking into maybe getting one better, larger turbo. Reason for figuring twins is the turbo's will be cheap as hell.

Any other ideas? ;)

Re: Turbo(s) for 2.8 I6
 

Single larger laggy turbo like all the other Supra owners end up doing despite there twin turbo foundation. Just get a big Holset.


JP

Re: Turbo(s) for 2.8 I6
 

Yes the turbo's may be cheap but then making the manifold and all the charge piping. Not to mention Dan you told me you can't weld and don't have a welder. If you know someone to help you fab it all up then I say go for it but just remember your running two of everything pretty much. Don't run different turbos. I was gonna run twin dsm T25s on my Z but I just said screw it and went with the single T4. ---- is just easier and cheaper.

Re: Turbo(s) for 2.8 I6
 

I could probably con c0mpl3x into whipping something up for me, haha. I just need to buy a welder and have at it.

Josh is currently trying to talk me into ssac mani/holset...

Re: Turbo(s) for 2.8 I6
 

no conning needed. feel free to ----- up my HF 151 anytime, or have me ----- it up

Re: Turbo(s) for 2.8 I6
 

use my gm8
its a bad ass price for a big ass turbo

Re: Turbo(s) for 2.8 I6
 

Thats probably the cheapest/most effective way to go...As much as I despise ssac.

Re: Turbo(s) for 2.8 I6
 

MINT gm8 for 200plus shipping......thats the way

Re: Turbo(s) for 2.8 I6
 

He's right. GM-8 is quite the turbo. I know a couple DSM guys running them with a smaller 5 bolt housing and the cars make really good top end. IB on the 5M it will be like it was made for it. Prolly get 20psi or so by 3500rpm or around there and it'll never stop pulling. For $200 you can't go wrong.

Re: Turbo(s) for 2.8 I6
 

Forget all that ----. Waste of time.
My personal favorite is a t3/t04s 60-1. A t3/t04e 60-trim hybrids work very well also.


As big of a torque curve as Toyota 6 cylinders have always had, you'll have alot of boost in the 3,000rpm range. And a 60-1 is 95% a GT35R. Those mother fuckers will make 550bhp at the drop of a hat, and are the fastest responding t3/t4 hybrids inspite of the t04s being the biggest thing you'll find even semi-commonly mated to the t3 turbine/CHRA section.
On the 100% stock 200bhp'ish 3.0L DOHC v6's @ 7psi. They tend to work out to roughly 370-400bhp @ 7psi, and they spool passed OEM power levels around the 3100-3300rpm range.
dohc 3.0L v6 t3 63 / t04e 60-trim @ 10psi. M/T
Attachment 28141
dohc 3.0L v6 t3 63 / t04s 60-1 @ 7psi A/T
Attachment 28142



You'll never spool a t4 class turbine turbo on that 5M in any reasonable amount of time. You better cam that mother fucker to hell & back. 'Cause mark my words, you'll not have full boost through atleast 4500rpm on almost any of the M blocks. It takes completely modified 7m-gte's to do that.
2g6 from now on no more commenting when it comes to talking about spooling a turbo. You should stick to honda.
GT40, 7m-gte
http://www.mk3.us/howard/supra/Dyno/...II1_resize.jpg
now stfu.

GM8 is also in that class.Takes 4250rpm to hit full boost on a 250bhp, very N/A torque 3.0L DOHC Toyota v6, an M block wouldn't have a useable torque range with it. Be looking at very high 4000rpm range to full spool.


To the original question. A pair of ihi rhb5's would be perfectly fine. As would a pair of t25, t28's, or t3's. I would stick with a t3/t4 hybrid. They're just ungodly sexy when you have 6 cylinders & around 3L of displacement.