Anyone have advice on T4 turbo?

[PorterzSupra]

T4 TURBO - .60 a/r cold 1.05 HOT

I have a CT26 running 18.5 PSI now, (along with alot of other mods) im no turbo expert, how much of an upgrade would one of thoes be over a stock CT 26 w/bc as far as spooling time, airflow and max boost and HP? It comes as a kit with intercooler, wastegate and manifold and there talkin near 600 HP!! Is this really as good of a turbo as they claim?? I dont know much about specific turbos somone care to give me a quick explination? I know exactly how they work but dont know what the differences are between the aftermarket ones as T3 T4 and "trim" and "clip" im guessing trim is the front cover and clip has something to do with the fins? Also with the aftermarket wastegate is that adjustable via vacume line b/c??

 

[PorterzSupra]

No one daring enough to take a stab at the aftermarket turbo world?

 

[Supra5MGTE]

I don't really understand all the numbers and stuff. Dot this, T that... confusing as hell. I need to read "turbos for idiots".

 

[s383mmber1]

if you find a book like that, let me know!

 

[gixxer750]

I have some advice *not being mean* but you have some learning to do before you need to take a stab at a turbo upgrade.

BTW, that hotside is going to take a WHILE to spool

 

[Joel W.]

I have a CT26 running 18.5 PSI now,

is that a stock ct26?

 

[PorterzSupra]

yes, with 3 1/2 inch exhaust from turbo to just a muffler turned up I can get 21 PSI in 5th gear on my aftermarket boost guage on my stock CT 26 but I keep it down to about 16-18 because the IC cant cool it properly and I dont wanna run my turbo hotter then it should be

 

[jtamulis]

the t04 with a 1.05 hotside means it will likely spool up around 3800-4200rpm
and make 500rwhp (600 crank) at 25-28 PSI of boost.

A T61 which is a bigger turbo, with a smaller exhaust housing (.58) would spool
up slightly earlier (3200rpm maybe) and would make 550rwhp.


The size of the turbo is how much power it makes, the exhaust A/R is gonna
show how quick it spools. a 1.05 exhaust is HUGE, and will not spool quickly
on a 3.0L motor. (now if it was a 5.7 chevy motor, using both sides...
it would spool quickly.


I would recommend you not get that, its gonna be a big HP monster turbo
that is laggy. Great for the dragstrip, shitty on the street.

Jeff

 

[Joel W.]

sorry to get off topic and be a turd, and im sure this horse has been beaten to death but i searched but didnt find anything... anyways, doesnt the stock ct26 run out of air at 15psi and starts to overspin at 13psi? just wondering?? ive killed 2 at 15psi... turbo deathscream..

JT, you have one of the nicest mkII 's ive ever seen.

 

[supradan22]

sorry to get off topic and be a turd, and im sure this horse has been beaten to death but i searched but didnt find anything... anyways, doesnt the stock ct26 run out of air at 15psi and starts to overspin at 13psi? just wondering?? ive killed 2 at 15psi... turbo deathscream..

JT, you have one of the nicest mkII 's ive ever seen.

I will be running a T04 like that also on my build up say hello to turbo lag but it has what I want and your will need to upgrade your fuel system if you want to boost more then 8 pounds. But yeah like what joel says most ct26s die at 15 pounds thats pretty impresive if yours goes to all the way to 20 or your boost gauge may be off.

 

[PorterzSupra]

hows does boost controllers work with aftermarket wastegates that sit on the manifold? How do you adjust them??

 

[PorterzSupra]

stock it was 6 PSI on my aftermarket guage

 

[Supra5MGTE]

my turbo shop told me for my 3.0L (5M bored out) I should run a a Turbonetics ball bearing T4 with a T66 compressor wheel. Whatever that means.

 

[MDCmotorsports]

To answer your question(s).

-Get the turbo, if you like lag and a blown motor (if your motor is stock and high mileage)

-The external wastegate works like a bov, but only it controlls the exhaust. The more exhaust the turbo sees, the more boost. The less exhaust, the less boost.

Please listen to what Jeff said above, its right on!

 

[jtamulis]

Remember, asking for advice is a great thing. If you can find a source you can
trust, listen to it. I've built lots of cars, and I'm starting to get out of it more
and more and just start selling parts as my body is not up to building that many
more cars 8-(.

Jeff

 

[mcpcola]

T4 TURBO - .60 a/r cold 1.05 HOT

I have a CT26 running 18.5 PSI now, (along with alot of other mods) im no turbo expert, how much of an upgrade would one of thoes be over a stock CT 26 w/bc as far as spooling time, airflow and max boost and HP? It comes as a kit with intercooler, wastegate and manifold and there talkin near 600 HP!! Is this really as good of a turbo as they claim?? I dont know much about specific turbos somone care to give me a quick explination? I know exactly how they work but dont know what the differences are between the aftermarket ones as T3 T4 and "trim" and "clip" im guessing trim is the front cover and clip has something to do with the fins? Also with the aftermarket wastegate is that adjustable via vacume line b/c??

Ok i can tell that from the numbers you are looking at the ebay kit. you can get that kit and then get a T4 exhaust housing that is say .68 and you will be fine to run that turho Supra_Girl on here is building one up.

 

[PorterzSupra]

I dont quite understand and it seems that 80% of memebers on here dont full understand either. This is what I have gathered so far correct me if im wrong. A "T4 turbo" is a reference to the COLD side or housing that ranges from about .58 to .70 in size? There is also the exhaust side or HOT side of the turbo that also is measured. Any combination can be mixed of matched for different engine/air needs. The must common exhaust side is around .68 for the supra but can go over 1.00. Is the intake and exhaust side usually suppose to be within a certin percentage of each other? What is the point of having a bigger intake and smaller exhaust or vis versa? A smaller exhaust means it spools up fast but with lower boost levels? a bigger intake side means more overall CFM airflow but does not dictate any overall boost PSI If you had a T66 for example that would be a bigger COLD side and most likely a bigger exhaust side but can be changed based on desired CFM and max boost?? **This is what I have put together in the past few days anyone wanna correct me or go more into depth please feel free because I know u cant always go by what you gather **

 

[mcpcola]

Every turbo has a Graph that shows the output VS input and it all depends on airflow of the exhuast system to the turbo. But the smaller the hot side the faster the spool time but too small will cause you to run out of steam early. The cold side sets the amount of air that is to be moved. I am not sure of the benefits of the cold side size but the hot side on that turbo is to big and will lag. Everyone that I have read run the .68 housing on the hot side with good results. The cold side of the turbo is good but the hot side again is to big and will lag.


This may help ya out. http://not2fast.wryday.com/turbo/glossary/turbo_glossary.shtml

 

[gixxer750]

I've run my 57 trim up to 22+ a few times. When I had my stock CT I ran well over 15 with it, but the seals were blown. That turbo had 135k miles on it.

 

[IJ.]

T04 Turbos have been around for many years and there are 100's of combinations of wheels and housings available for them!

The Turbo you're asking about appears to have been set up for a diesel as they usually have a small cold side when compared to the hot side.

If you were building a high RPM motor it may work but on a stock redline motor it's going to be unresponsive and not at all nice to drive.

There is no real black art in choosing a Turbo it all comes down to numbers.

The new GT series has thrown a wrench in the works as far as "conventional wisdom" goes as they don't seem to follow any known laws of physics!