Difference Garrett T04R /T04Z
 

I'm going to change to a single turbo setup, this winter or the next, gonna try to reach approx. 450 -500 HP. The turbo shouldn't be too big, as i want an early spool around 2000-2500 rpm

...think the T04 should be a good deal, what do you mean?

And what are the differences between the 2 named in the title? I think, the "Z" is a kind of "latest revision", but both are better versions than the S/E ones, right?

And sorry for my bad english... :)

Try the single turbo section, you will get more answers there

neither of those choices are gonna spool that early.

I have a T04Z on my car with a street port. I waiting to get it tuned so I will let you know when full boost. It should be around 3-4k. I'm looking for around 500 rwhp.

The Z is the ball bearing version of the T04R. Full boost is around 3700 RPM.

Jason

..oh. The R is only jounal bearing? That's too bad.

...nd what about the To4S/E types? Are one of them good for a quick spool up? I have to ask, because the T04-types are not mentioned in the Garrett 2007 catalog don't know why... :(

"quick spool up" and "450-500 rwhp" (I am assuming that you meant 450-500 rwhp in your first post) ... it's all relative to your expectations.

I have a T04S and I make 405 rwhp at 1 Bar boost. I think that it spools up very nicely (around 3500 rpm I have full boost).

Someone who has stock twins might think it's laggy.

Someone with a GT42 might think "sure, it spools fast, but it's TOO SMALL and doesn't make my power!"

What is your target rwhp?
What boost level do you want to run?
Which RPM is closest to where you expect full boost, 3000, 3500, 4000, 4500, 5000+ ?

My turbo spools great, but it's not the right one if you want 500 rwhp probably.

...really hard to say, because i have no comparison to a single turbo-RX.

A single will surely spool a bit later than the twin, of course, but i'm searching for a turbo who makes good, driveable, reliable rwhp (i think that should be anything between 400 and 500, afaik) combined with an early spool.

So, based upon datasheets i have read, a GT40 or anything like that will be too big. As i can see in several brochures, the T04-series is good for around 500 HP, and so i thought, that will be the perfect turbo for me....

..but i hav seen many GT35R-setups, so that one will have his benfits, too...

...tell me what you think, i'm not really sure...

I have a Garret T04R and it's dual BB not journal bearing

id like to see an in-depth comparison between the t04z and the gt35r...

this thread is of particular importance to me because i'm looking hard at deciding between the T04R and T04Z for a street setup for myself. anyway, this is about you since you started the thread. so as Wargasm said, there are too many factors here that are relative so there's going to come a point where you'll just have to take a leap of faith.

i don't know, but it sounds like spool is a HUGE issue to you and there may come a point where you have to decide between spool time and ultimate power level.

write it out on paper. what kind of porting do you currently have? what kind of porting are you willing to get? are you looking for something you can get in a "kit"? are you willing to choose whatever parts necessary to meet your goals? how much boost do you plan to run? what kind of fuel is easily available to you? will you want to use a fuel adjunct (water, methanol, etc.)? these are just some of the questions you have to answer.

my opinion (enter disclaimer here) is if spool is really an issue for you, i think you may end up looking at one of the smaller turbine GT35Rs. spool is going to be good and you should make decent power.



oh and i think you're written English is better than many people that claim it as a first language. :D

to the original poster ~

i was responding in another thread and i remembered that wrote this without clarifying something. my comment about the GT35R here is under the assumption that you're running stock ports and are not excited about porting the motor. if you are going to port, then my suggested turbo choice will be based on the porting you choose. just wanted to clarify that.

i currently have a Garrett T04E 60-1 AR.96 turbo and we dynoed it this fall and we got 406rwhp at 13.7-14 psi. It started boosting at about 2300 rpm and had 6 psi by 2800 rpm and 10 psi at 3000 rpm then 15 psi at 3500 rpm. Due to exhaust limitation of the 3" exhaust system the boost would drop down to 13-14 psi, but max HP was made at about 14 psi.

I would also recomend running dual wastegates and atleast a 4 inch downpipe and a 3.5" midpipe and maybe a 3-3.5" Catback.

I will be running a complete 4 inch system for my car with either the T04Z or a GT4088R with dual wastegates next year.

JT

There are some discrepancies with how Garrett labels their turbos...or should I say how other people label Garrett's turbos. The T04Z is simply a ball-bearing T04R. T04Z was not a name that Garrett created...it is a name that HKS created and since then has been called that. Some companies will sell a ball bearing T04R and call it a T04Z (ATP Turbo is one of these companies). Other companies however will label it as a ball bearing T04R (like Phoenix Turbo, where I got mine). So, T04R Ball-bearing and T04Z is the same thing. If you don't see ball-bearing after T04R though (or it costs under $1000) it is most likely journal bearing.

I am still in the process of building my new car with my T04R ball bearing....but I did used to have a T04R journal bearing turbo with a .84 A/R on my old FD. Full boost (1 bar) was about 4200-4300 rpm on the stock ports. Made 365 rwhp on a very conservative tune. The car really needed a ported motor.

T04-R is a pretty wild turbo. You'd have to do some interesting things to get spool-up comparable to a 35R out of it.

I ran my R (journal bearing) on a half-bridge'd engine with a 1.00a/r exhaust housing and could get full boost (14lbs) by a little over 4K........but 4K to redline was a blur. But below that however there really wasn't much umph. A 35R would have a much broader powerband for sure.

I really dont see the point in this..
A well designed manifold with a good WG makes this totally unecessary
On my setup, GT42, large SP REW, 4"exhaust, i can hold down to 10psi with a single tial 44 without a problem

I ran a PT67 same as a T04r and was very much impressed with the 42 compared to the 67, because the spool of the 67 wasnt "that" much better compared to the 42

this was a PT 67 (66.5 ind, Ptrim, 1.15) vs gt4202 (plain bearing, 75 ind, 1.01)

I beleive the gt42 has a "s" trim turbine which is much much larger than the P, and a gt40 has a turbine comparable to that of a "Q", someone can correct me if i am wrong