t3/to4 upgrade on 91 t2
 

Im doing a up grade on my 91 t2 that has 74,000 miles on it. I want to do this right. Right now Im using the stock intercooler until I can talk myself into getting ride of my ac unit. Solcal hot!!!! I have right know 720cc injectors, casmo fuel pump,profec a boost controller, Chris sanders tid,aeromotive fpr 1/1 ratio at a rising rate,t3/to4 garret turbo with a ceramic impeller. I would like to run 12psi safe. Please let me know your thoughts.
Thanks Robert

Don't get a t3 hybrid, thats too small of an exhaust side for a rotary...

:withstupi word.

is that profec a actually working on your car?

Yes, at 12psi

T3/T4? How are you getting away with that? The T3 exhaust side is way too small for a rotary unless you really must have full boost just above idle speed.

Not true about haveing boost at idle. What it is a s5 exhaust housing with a to4 garret compressor. Ported mite I add and with an ceramic exhaust impeller. I want to run safe boost at 12 psi. What more do I need?

Have any of you who said the T3/T4 hybrid is to small had any experience with...or is it just what you've read?

I could not of said it better.

buy my TO4B!!! .60 compressor, .96 A/R. $300. Itll work perfect for your car.....

no thanks, I have already have the turbo and its match ported to the manifold . the manifold is match also to the gaskets, but thanks anyways Bebesito21

No I want your turbo :D !

Just what I have read, I can't believe the gt 35/40 has a t3 exhaust side:eek:

1Revvin7 If you read my post, The hot side is a S5 wich is a basic t3, cold side is a to4b (62-1). I just want answers not gimics!
So Please post answer not gimic!!!
Thanks

in your title you said it's a t3/to4 hybrid turbo. The stock hot side is in fact bigger than a t3, so if you put a t3 turbine in, you would have gone down in size....

Most people reffer to what you did (bigger compressor wheel and housing) as a hybrid turbo. That being said....the 62-1 is freaking huge compared to the stock hot side, and I imagine the turbine will become a restriction sooner than you think. A full blown to4 62-1 would put down more power, easier, safer. I do believe that BNR does put a 60-1 wheel onto the stock turbo for the stage 4 hybrids. I think bluetII has one if I can remember correctly....

I'm sure you could 330-350 rwhp but after that the stock hot side would be choking the engine since I doubt it can flow enough air out of the exhuast turbine fast enough...

I'm interested to see what kind of power you end up putting down though. :)

What I do want to accomplish is about 300-350 safely. An everday driver. I did not want to go wild that is why I chose this turbo. I know just need to see what else i need to run so I can run safely. 12psi is what Im looking to run, nothing more.

I think you're defintely going to need 720's in the primaries too. Nearly everyone with hybrids on the stock ecu with a piggyback runs lean before the secondaries come online because the computer won't drive the primaries more than 60 percent until the secondary cross over no matter what.

You'll want a front mount, as the stock top mount can hardly keep up with teh stock turbo at 12psi.

In the end it's better to go with a stand alone like the e6k or lt8, but you could get away with the stock ecu for 300rwhp. I would probably retard the overall timing a couple of degrees just to be safe though.

I was looking to buy a safc and augamist system for the detenation problem and air fuel problem or plumb in two 550 cc injector with a controller.

Im sorry I posted wrong the turbo is 60-1

why dont you just get a t04 60-1 compressor and use the stock hotside? the stock hotside is pretty large and good for atleast 300 whp.

I have what I got. I just need a little advise what to run SAFE!

how much would a 60-1 compressor run me? wouldnt the turbo need to be rebalanced if you were running with the stock turbine?

i'm curious because i saw a lot of play tonight when working on installing my MBC. also, even with the MBC almost all the way open, i'm only seeing 9psi so there is some kind of issue there and i think the turbo is at the end of it's life at 110k miles. however i dont have a ton of money to spend. thoughts on not-ridiculously expensive hybrids anyone?

$400 without a core. I hade a core to give the shop I had mine bulit from. Yes it has to be balance

bnr turbos man. the stock HT18 that has a t04 compressor i think is 350 bucks. i think it says it makes 300 hp. i think stage one is just a bigger compressor wheel, stage two i forgot, and stage 3 is a t04 compressor housing and 60-1 wheel i think (not exactly sure) check out BNR's website. i think the most expensive one (stage 3 or whatever) is 500 bucks and it can make 350 at the wheels.
you send them your turbo, they rebuild it (and use the bigger compressor stuff) and send it back.
the best thing about the stock hotside hybrid stuff is it still uses the stock turbine, internal wastegate and manifold so you dont have to buy all that shit. you can also still use your same downpipe and exhaust.

what's bnr's website?

go to BNRsupercars.com it has an email and phone number to talk to bryan the owner for any questions. (their site is temporarily down)

I just wrote br7 racing and I think I'll go with a microtech and 720's in the primarys too. Its in my price range. Thank for everyones advises

Since this is somewhat related, any suggestions on a quick spool turbo? (Keep drifting in mind, I just want power sooner in the lower RPMs. Don't really want to have to keep the engine wound all the time)

I have been reading all this stuff on t3/t4 vs 60-1 and 62-1 and I have a question for everyone. A properly trimmer t3/t04e say, an 57/63 trim.. modest enough, how can this turbo flow enough CFM for 500hp on a 2 liter car... and your stock turbo's are running out at 350? You talk about heat and backpressure.. fine. BUT running a 62-1 at 12 psi isn't even up into the peak effiecency of a turbo that size.. therefore it is blowing extra heat (turbos generate heat anywhere outside effiecency, boost too high or boost to low NO?) and if that is the case you are counteracting the benefits of lower backpressure, by blowing hotter air back into the engine!

There is a huge fact about t3/t4 that nobody seams to take into account here. a t04b is tiny, t04e ( what I explained above) is large, and a t04s (the compressor on your 62-1) is huge. and these would all technically be t3/t4.. no one is specifying here. It seems like you are all talking based on heresay... someone show me the stock compressor map on the stock turbo vs a 62-1... then a the t3/t04e with the 57/63 trim. look where the effieciency ratings are. I am betting most people who are running thier huge turbos are running in the lower end of their eiffieciency, while if they had a slightly smaller t3/t4, they would be smack in the middle, make as much power, and spool faster. Does any off this make sense?

The problem with reading a compressor map straight from the graph, is that its different for rotory engines.

You need to use about 12.5lbs/min of airflow to equal 100bhp on an extend ported 13BT.

I don't see how you figure that the T04B is smaller than a T04E. The 60-1 compressor has a 2.324"/3.000" inducer/exducer, while the largest T04E (60) is 2.290"/2.950".

For comparison, a T3 60 trim is a 1.83" inducer and 2.367' exducer.

Also, a To4B 60-1's peak efficiency is at 10 psi (1.8 bar absolute), and its still good at 15. Perfect for the street.