I wanna build a 355 forged 9:1 compression with cam and ported heads for a twin turbo setup...what do you all think about these turbos?

they are t-3/t-4 hybrids 57 trim ...heres all the specs
stone mountian racing turbo stage 3
TO4E turbo
3" inlet
2" outlet
.50 A/R compressor
.63 A/R turbine
.57 trim

TURBINE WHEEL:
EXDUCER: 2.48"
MAYOR : 2.89"

COMPRESSOR WHEEL :
EXDUCER: 2.07"
MAYOR : 2.36"

there pretty cheap on ebay, supposedly can make 25 psi, there made for b series hondas and similar 4 cylinders

 

They're very small too...borderline "cute".

I think you'd be better off with a T04B or even 60-1's.

 

I agree, you'll want some full T4's 60-1's sound nice. Depends on your HP and boost goals. Do tell more.

 

those would not be bad if they are set up right, john meany is runnign 52mm on his c4 and is making 1300hp. he went to the track on street tires and did a 11.11 at 151mph! If u know what u are doing u can make power with those. he also is runnign 18 degree heads.

this is the only article i can find now.

http://www.supercars.net/garages/ChevyRocks/1v2.html

 

its gonna be a street car mostly...occasional track use. i want to run on pump gas, as much psi as i can get away with. I want to shoot for at least 750 rwhp, i know there small, but with two i thought mabye...there like $250 a piece so thats why i was curious.

 

john meanys car is a street car. he drive it everday in the non winter months. and pump gas. check it out.

 

Yeah that thing is sick, but i couldnt find any info on the turbos hes running...

 

He's running some kind of grand national turbo if I remeber correctly.

 

I personally do not see the reasoning behind running t3/t4 hybrids.

As far as packaging is concerned, the compressor housing will always be larger than the exhaust housing, so why not just run straight T4's?

I don't know anything about hybrid turbos, but if it were me, I would build the system with T4's so you could step it up in the future without rebuilding the entire system.

 

I just bought two master power T-70 from forcedinduction.com
I was going to go with two T4 sc-61s and he sells both and recomends the t-70 larger turbo 850hp each and is lighter then the sc-61 so spool is the same he said a little better actualy (physical dimensions is the same). He sells them all innovative, precsion, master power garret gt. He has the best prices and is a partner with pro-turbo guys.
My motor will be a 400ci dart block etc

 

Jose is on this board. His name is JZ 1500 something.

I agree. Starting w/ a T4 flange allows you a lot more variety.

I'm just wondering about the whole "street car" thing. Is this just for puttin' around in or something that'll be raced on the street? I think a pair of T04-based turbos would make more than enuff power for the street.

 

First I want to say, do not buy a stone mountain turbo, they are junk. We have had many come in for rebuilds and are completely destroyed. All signs point to bad balancing.

Next like Jim mentioned, if you can squeeze them in, go with T4's. The T3/T4 hybrids will work, but why limit yourself on what turbos you can upgrade yourself to later. Don't get me wrong a well thought out hybrid can make plenty of HP.

Next, yes we have had great success with the MP T70. They are spooling extremely quick and are making some great #'s. Due to the fact they are small shaft units instead of big shaft, that is the main reason they spool as fast as the smaller units.

John meaney's car is using the PTE-52's. They are just regular 60mm units with a smaller turbine wheel.

Jose

 

I hate to be the bubble burster - but why not just go single? You honestly will have the same potential as a twin setup when done properly - and not only that, but packaging can be a lot easier. Can you do a well packaged twin? Sure, but sometimes the singles have advantages space wise, espicially under the hood of an lt1.

Dont buy anything Stone Mountain makes. Just dont. Aside from turbo problems, there are common wastegate failures, cracks in their headers and manifolds, and from what I've heard, customer service is either good or REALLY bad depending on your luck.

If you want to do twins - I agree with the T4 mark. A pair of T3/T4 hybrids can be cheaper, but the flange will set you back a lot...

I think the goals of the car are the first thing that needs to be decided, as that will tell you where you need to go. Then add a bit for future upgrades, because eventually once you get used to 600rwhp, you'll want more.

Then you go and drive a Hyundai and die of boredom behind the wheel.

 

the only reason i wanted to run twins is becuase those turbos were so cheap...the car will be raced, but still going to be a daily driver. A cage is goin in when the engine is out so i can be legal at the track...what turbo do i go with for a single? also, i was going with logs instead of headers...how bad will that hurt power?

 

you're gonna need a t-7X or bigger to go single, that'll run you $1200 - $1600. Singles are nice in certain setups, manditory in others. It all depends on wher you want to put them. I'll tell you its alot easier to plumb two 3" downpipes instead of one 4". And they will outflow the 4" too. It all depends on where you want to put them.