I'm curious about this particular turbo; I am not well educated on turbo specs, etc. can anyone describe what to expect for the powerband on a large streetported engine with a 42 with these specs:
56 Trim Compressor Wheel
2.770 in. (70mm) Inducer
3.700 in. (94mm) Major

0.66 A/R Comp. Housing
4" Inlet, 2.5" Outlet

84 Trim Turbine Wheel
3.220 in. (82mm) Major
2.947 in. (75mm) Exducer

1.12 A/R Turbine Housing
Large Frame Inlet

If set for 10 psi, what would one expect for output? Would this need different fuel from, say, a T04 or other turbo? Like I said, I'm not well versed in turbo terminology so any help would be appreciated. This is my first turbo project.

 

10 PSI on this turbo on a 13B is not really a good match. It will be laggy and only have power at the top end of the rev range. Probably something like 350 rwhp would be my guess, but it will have a so-so (or maybe even sucky) midrange in my opinion... This is all going based on the specs since I don't actually have a dyno from a GT42 on a 13B

If you're looking for a turbo, I think the best way to do it is to set a realistic HP goal and then make the choice based on that. Why don't you tell us your goals as far as HP, driving style, etc.... and then we can help you more.

Also check out my dyno site.... http://dyno.zeroglabs.com/

Brian

 

I really intend to reach around 300 to 350. The engine, as it's going in, will have 720cc secondaries, S5 turbo and the RTEK 1.7 (for the winter). Using ITO template ports and mostly stock everything else except for TBC coated rotors. I don't expect this to meet these HP marks, that's for later.

Power, for me, needs to be a good midrange as most of the miles will be around town or highway; no racing or crazy high-speed stuff. This will come from whatever I pick up over the winter for next summer...

Long-term, reliability is key. This isn't a daily driver and time isn't all that important. Just a project/money pit for fun and to learn a bit about the turbo side of life.

 

Ohk, that turbo you posted is WAY to big for what you want. To me it sounds like you just want a hybrid.

 

A GT42 is huge! Check out a GT30 or something of similar size if you aren't looking for big HP numbers.

 

I figured it would be too large. I've read on this board that the hybrids really don't seem to be worth the money compared to a complete T04 install. I do not really know anything about the GT30, cheapturbo has them listed (GT307r) but with these specs:
Compressor
.50 a/r 4inch inlet
71mm 56 trim wheel
flow: 46lbs/min

max WHP rating: 475whp

Turbine
T2 flanged .86 a/r
57mm 90 trim wheel
Internal Wastegate (Acuator not included)

What is the difference between the T3/4/2 flanged housings? I haven't seen anything for the 13bt aftermarket outside of the T4. Functionally, would this turbo work for the given parameters? Would it be working in its efficiency range? Would the GT35 be a better deal overall (not really price, but performance, etc.)?

I have time to make the right selection; like I mentioned, none of this is going on the car this year--the turbo will be for next summer. I do intend for the build to last for some time.

 

Just curious why you guys shoot this turbo down. You think it will be so "laggy", but you can't be any further from the truth. A T6 frame turbo will spool every bit as fast and even faster in some cases. With 2" runners, thats a boat load of air that will spool even the biggest of turbo's. Don't always believe what everyone else does is the "rule". Give it a try, you won't be let down. I'll be posting dyno results in 4 weeks with a PFS street port. Don't be surprised if I put down 500rwhp or close to it, at only 15psi on pump gas. Gonna shoot for 700rwhp on C116.

 

Damn, what is the exact setup on your car. I want to make 450 whp at 15 PSI, this sounds like my turbo. But the question is, how streetable would that be? Also where can you get this kit?

 

It will be as streetable as you want it to be. GT42R. www.a-spectuning.com

 

Sweet man, thanks. Can't wait to see your results.

 

for 300-350 rwhp go for a GT47
The Bigger the better for lower HP goals *sigh*

imperial metric

inducer 3.18" 80.8
exducer 4.25" 108
trim 56
ar .69
inlet 6" 152.4
outlet 3" 76.2

Turbine

inducer 3.65" 92.6
exducer 3.3" 83.8
trim 82
ar .96
flange T6
bearing plain
cooling oil
rpm 5600
weight 58lb 26.4kg

 

lol wtf?!

 

Do you really think it´s capable of as much as 350rwhp?!
I would use a Turbonetics Thumper T-106 for that kind of power...

 

hmm well with a 1 1/2- 2" Down Pipe .. I think its possible

but your right a 100MM+ thumper Turbo
could get 300-350 RWHP more easily then a GT47

Ok Then for his goals and still wanting to use a GT based garrett turbo
I would then recommend a GT60 it has a 141mm Comp Wheel
200 lbs/min of super efficent airflow

I think thats the turbo of choice right there!

 

Here is a picture of a GT47
which is too small for 300-350 HP goals

A GT60 is better suited for drblasto goals

 

The GT60 is the one to use! It gives a little more margin, if he would like more power in the future I think it could be pushed close to 400rwhp... or at least around 375rwhp! But then a 2" downpipe is a must, and maybe a upgraded fuel pump would be a good idea!?

 

yea a upgraded fuel pump with smaller then stock fuel lines
is recommended

 

I didnt mean to shoot the gt42 down at all. In fact that is one of the turbos im thinking of using on my car. He said he wanted between 300 and 350 rwhp which is why i said its to big for what he wanted.

 

The GT42R is twice the turbo for what you want. NXFD on this board made 390rwhp @ 10psi with this turbo. And it wouldn't be laggy to whoever said that. I rode in his and laggy was the last thing I could've said about that car!!

 

Kabooski,

tell whoever is building that supra to make sure that put a child/varmit catcher on the front of the turbo....

wouldn't want any FOD damage, and a medium sized varmit tends to damage turbine blades, and small to medium sized children would really mess it up, even though their parents probably wouldn't care.

Kenn

 

If you actually saw a GT60 sitting next to a 42R you would laugh at how funny you sound.

 

i got a pic of my buds half bridge with the GT42 now
675rwhp @ 30psi
dont have a place to host it so get me on msn and ill send it over to ya
saint_912@hotmail.com

if anyone cares :P

 

You should tell this guy to give us a call at Virtual Works. We have that turbo on more than a few Supra's and they all have the stock hood. That setup doesn't look like the hood will even be anywhere close to fitting.

I was going to try and use that turbo for my RX7 but we couldn't get it to fit without some serious work. It wouldn't have been worth the time and hassle. But it would've looked really crazy!

 

In that case you won't be needing that manifold!

 

Hey Ernie, the turbo he didn't use was the GT47. But that is an incredible looking manifold, are you guys mass producing those or is it a single production unit? Your car's coming together really well. Can't wait until you hit the dyno.