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.

Re: Turbo(s) for 2.8 I6
 

t3 63 / t04s 60-1 will out spool GM8 (ihi rhc6) by more than 1000rpm, and flat out power it at the same time btw. ;)

rhc6's are small end t4 class turbo's.

Re: Turbo(s) for 2.8 I6
 

STFU asshat! God I hate know-it-alls. Without looking at maps or charts that was a top of the head guess. I also have no experience running it myself. It wasn't a set in stone number as demonstrated by the quote below. Stick to Honda? I've never owned a Honda lol. I am a DSM fan and also work with MHI turbos. A ------- thesis paper for a post is ------- gay, so take your pompus ass away from here numbnuts!

Re: Turbo(s) for 2.8 I6
 

For the record, this engine is never being built up and I'm not going to run it much farther than 8-10 psi (atleast in the beginning...)

Re: Turbo(s) for 2.8 I6
 

thats what we all thought in the bigining

Re: Turbo(s) for 2.8 I6
 

sure stage 3 turbines with a big t4 comp is the way to go, can'T go wrong with the borg either on such 6 cyl.
but actually you can get full T4 turbos that spool super quick as well. THey're available with very low turbine a/r's.
recently, I made a lot of turbos for toyota's 6 cyl.

on a 2Jz, I went with a full T4 P trim 0.96 a/r with T04e bored out to 60-1 with a lug style. Result: amazing top end! the guy runs 17 psi. automatic tranny. scary fast. Spoolup: definitely not quick but good enough. The customer loves it.
http://www.blaastperformance.com/ima...eurisupra2.JPGhttp://www.blaastperformance.com/ima...eurisupra1.JPG

then on a 7mGTE, just 2 weeks ago, I went Full T4 O trim 0.58 a/r with a H trim t04B .70 a/r. REsult: early but gradual spool up. not gradual enough apparently, because this thing is absolutely dangerous at 15 psi. the customer loves it too.

then just recently, on another 7mgte, full T4 O trim twin scroll 0.48 a/r H trim, guy will put that on a SSAC twin scroll manifold. Result: will know very shortly.

Re: Turbo(s) for 2.8 I6
 

You god damned newbie if you don't know what the ---- you're talking about then don't talk. ESIPECIALLY IF YOU ADMIT YOU DON'T
Ignorant ass ------- wanker.














SinisterCRX mind the head gakets (If you don't know much about M blocks, please get the head torque right!).

Re: Turbo(s) for 2.8 I6
 

Well, since we're on the subject about Toyota engines and turbo's, what would suit a 3.4L 5VZ-FE? I'm want to run between 10-15 psi. I'm thinking maybe a GT3782? Any experience with this engine and psi range Toysrme, blaast?

Re: Turbo(s) for 2.8 I6
 

it'S the 190 HP one?
basically, all the turbos we discussed could work. A Borg would definitely work and give you 300-400 WHP easy. Only downside to it, it's not really customizeable but it's about right for this application. Stage 3 t3/t4 could work great, .63 or .82 a/r, as well as Full T4 turbos, with most any T04B or T04E compressor depending on your desired power and most any turbine trim but a/r not higher than 0.80 IMO. if you choose a garrett, you can easily swap turbine A/r's to fine tune your spool up anyways.

Re: Turbo(s) for 2.8 I6
 

The biggest question is what kind of rpm range are you looking for the 5vz-fe?
Weasy (Johnny) sells 5vz-fe cams.


The 3.4L 5vz-fe is a Toyota truck based engine. That means it has an insane torque curve, and cuts rpm very quickly. In your case, low 5000rpm range. That means there's absolute no reason for you to have a t4 class turbo unless you're doing cams/headwork with a full stand alone to take advantage of it. Stick with a the two biggest t3/t4 hybrid turbo's. You will have a boost curve unlike almost anything on this forum. You'll read positive boost instantly off-idle rpm. You'll hit peak boost in the low 2000rpm range.
Just mind the high rpm range. Under boost It's really easy to blow passed the fuel cut. Toyota engines have fuel cut, then say 400-500rpm later have the ignition cut. You get one with a turbo, or blower on it & really flog it passed the stock fuel cut. You'll be eating a piston top from alot of air & alot of residual fuel.


Good news is the pistons are the perfect compression ratio, and the engine itself is a mother ------- tank. Easy 450bhp stock when tuned right. 550bhp reachable. Passed that is possible with say lots of water injection, and good tuning. (new valvetrain would really help that quest tho on the OEM bottom end. Really helps to have alot of rpm to make big numbers).




Attachment 27989

Re: Turbo(s) for 2.8 I6
 

All true, we're all on the same page.
just don'T forget that on top of the usual Truck T4 turbines that are huge, some performance ones exist with smaller wheels and low a/r's. The largest T3 turbine is larger in terms of flow than the smallest T4 turbine.
example: T3 stage V has 61.95 mm exducer while T4 N trim is only 52.60 mm. Yes, a t3 wheel exducer almost 3/8" larger than T4.

Re: Turbo(s) for 2.8 I6
 

I've used a Turbonetics full T4 on the stock 5vz-fe and boost didn't even kick in until 4500-5000 rpms. Turbine A/R was .69 P-trim. Compressor A/R .60 T04B. By the time I saw boost, I ran out of RPM's.

So now, I'm looking at this turbo.
http://www.turbobygarrett.com/turbob...2_452159_3.htm

I can get a good price on it. I think this will better suit me. It has a T3 turbine of 1.12 A/R divided. Comp. .54
What's your thought on this? I want to run max. 15psi.

Re: Turbo(s) for 2.8 I6
 

Yeah, P trim is huge, you might have tried N or O.

GT 3782 is just 2mm smaller turbine wheel than P trim and the lowest a/r available is 1.12 a/r. Not sure what makes you think it will spool quicker than the P trim .69 !!! :-\

Ok.... in order to nearly amtch the GT3782, My suggestion for this would be a t04b h trim or even a 60-1 compressor, mounted on a stage 3 turbine. Start with 0.63 a/r and you know you can easily switch to 0.48 or 0.82 if need be to adjust spool up to your taste. for Less than 15 psi, you don'T even need the 360° thrust but watercool will be a most especially with .48 and .63.

Re: Turbo(s) for 2.8 I6
 

why not just run a 7m manifold and a ct26 and be done with it ? or better yet just swap on a 7m head it flows better any way

Re: Turbo(s) for 2.8 I6
 

Yes, sure!! But How many CT26's are needed for 500 HP ?:S

Re: Turbo(s) for 2.8 I6
 

a bucketfull

Re: Turbo(s) for 2.8 I6
 

A/R is too big. On the 5vz-fe, as compact as the rpm range is. Your classic .63 t3 housing will be perfectly fine out passed 400hbp.
Avoid CT turbos at any cost. Stay with brand Garret/Holeset/IHI-Borgwarner, or mhi. (CT26a off a 7m-gte would make 375-400bhp @ 16-18psi on that engine.)

Re: Turbo(s) for 2.8 I6
 

Thanks for the heads up. It's going to be the Garrett T3/T04E Stage 3 .63/.60 57 trim I guess.

Re: Turbo(s) for 2.8 I6
 

Get the 60-trim compresspr, just trust me. :D

Re: Turbo(s) for 2.8 I6
 

t3 60 trim?
T04B 60 trim?
T04E 60 trim?
60-1 ?

They're all 60 trim.

Re: Turbo(s) for 2.8 I6
 

Im implying for him to step it up to the 60-trim.

Re: Turbo(s) for 2.8 I6
 

sorry.v Oh yeah, defintiely, the t04e 60 trim is the biggest of them all. It's certainly kicks ass! 70% brings it to over 450 HP (if you don'T mind boosting 20 psi)

http://www.blaastperformance.com/maps/t04e60-map.jpg
Just for sakes of comparison, the t04B H trim is comparable. 70% also brings you in the 450 hp range when boosting 20 ish psi. Ok, accoring to them, it's 4-5 % less efficient at peak but still, i used it a lot and it really made B18C's, H22's and 7MGTE's scream when used wit the proper turbine side.

http://www.blaastperformance.com/maps/h-trim-map.jpg

Re: Turbo(s) for 2.8 I6
 

No problem man. Oh it won't take 20psi to make 450bhp lol! The bigger the displacement the less boost ya need woohoo!
I saw a 7m-gte making 4whp/468ft-lb @ 18psi. Too bad they're 4valve & 5/6m's are 2 valve. (Atleast they're big valves lol)
I really don't see any reason why he couldnt make atleast 550bhp @ 20psi on one provided the t3's turbine wasn't too bad off. Maybe swap it for an .82 A/R. It's been done before.

I just think it's going to be a hella fun project. One of the older guys at school passes a beater cressida around to some of his other friends. I'd love it if he put it in my name & left it in the driveway. lol Cressida ftw woot!


btw sleeper from hell outside of an early LS400.

Re: Turbo(s) for 2.8 I6
 

Yowza!!! :o

Okay, so lets say I get a stock as a rock 7M-GE or just the head on my 5M. I'm going to have to assume these big horsepower numbers you speak of were NOT on stock engines...

Re: Turbo(s) for 2.8 I6
 

The thing with swapping a 5/6m-ge with a 7m-gte is that it's a hell of alot of wiring. More people turbo their 5/6m's than swap 7m-gte's. http://www.7mpower.com/7m_buildup.shtml a quick guide if you're wondering.
What's going to kill you is seeing guys make more torque than horsepower even up to 800rwhp. lol! Stock cams are pimp mid-range.
http://www.7mpower.com/will_neely/will_neely_dyno.jpg
That's so sick.


On a good condition 5/6m-gte you can still make 400rwhp aslong as it starts in good shape. Lotta torque. Whole lotta torque.

Re: Turbo(s) for 2.8 I6
 

http://www.supraforums.com/
http://forums.celicasupra.com/forumdisplay.php?f=15
http://www.7mpower.com/

Go lurke those forums. They'll ahve alot mroe to tell you than I.

Re: Turbo(s) for 2.8 I6
 

woah. Goofy dyno chart!! Goooooood torque down low!!

Yes, it's sick... Especially when tuned at 12.5:1.
safety margin: none I wonder how long it lasted!!

but yah, the 7MGTe we just did is bone stock with 550 ccm's and that .68/.70 T4 H trim with vertical flow intercooler at 12 psi definitely makes 350 WHP as per my butt dyno. Can't wait to test it on a real dyno. THe guy just bought another 87 supra, identical colour and all, but 1JZ twin turbo and i think we'll single turbo it too.