T4/T04E Insane or Just stupid

[S13FX]

T4/T04E compressor housing a/r .60 and .60 trim

So I just aquired this baby, it's absolutely in great shape. Im going to be using it on my fully build SOHC, with hopefully a solid lifter conversion, tuned with an EEPROM, SAFC, and I also have the MSD Knock Meter, and a PLSM300 for extra security.

In my opinion it doesn't seem too big for a T4 especially. My main question is I want to start off using this turbo at lower boost, I also know that since this is a bigger turbo how much boost I should I start off with? Would it be inefficient to start lower then 10PSI, I was thinking something like 8psi for break in period?

Any opinions will be greatly valued .

[hannibal]

A straight T04E isnt too big. I'm sure WDRacing would love it haha. Whats the exhaust A/R?

[S13FX]

OOOPS sorry its .70, Well Im going to see how this puppy runs I plan on using it on a spare block I have at low boost, and some tuning before i throw it on my build block.

[Neejay]

While we're on turbo sizes:

What kind of response would a T3/T04e 52trim/68AR yield?

I probably should have gotten something smaller for a quicker response, since I have an auto...

[hannibal]

As long as the A/R isnt too big, it should spool up decently. I'm guessing somewhere after 4000rpm to make 10psi. (I just pulled those numbers out my arse based on stuff Ive read.)

Neejay, T3 turbines dont come in 0.68 A/R and T04E wheels dont come in 52trim. What kinda weird turbo is that?

[Neejay]

As long as the A/R isnt too big, it should spool up decently. I'm guessing somewhere after 4000rpm to make 10psi. (I just pulled those numbers out my arse based on stuff Ive read.)

Neejay, T3 turbines dont come in 0.68 A/R and T04E wheels dont come in 52trim. What kinda weird turbo is that?

It's a garrett/turbonetics hybrid.

[WDRacing]

And you'd be right to...lol. Thats what mine started out being, course I have a BB center section. My hot side is a .81 AR though...no backpressure for me. Good for tons of power. I'd expect you to see decent boost in the early 4000 range. I don't get the flash spool till 4900-5100 depending and that was with the TO4E compressor housing, I have the R now..good for about a million horsepower

Although, I have been debating installing that turbo on a 302 and dropping it inside the S14

We'll see how things turn out.

Oh, for the record. it's just a TO4E, it's not seperated unless you're using a hybrid. What you've got there is a full frame T4 turbo...

[C-Kwik]

You should confirm the Turbine trim as well. The A/R by itself does not tell you the entire story. And if you need to change to a smaller A/R, it's relatively simple to switch to a lower A/R exhaust housing. You would need to confirm the turbine wheel trim to make sure you get the right housing though.

[S13FX]

Ok this is kinda confusing hehe are you talking about me? And yah I did some more research today and look at the compressor maps, at 10psi with my setup I should full boost at around 3500 but I guess Il find out by the end of the month. And yes it is a straight T4 I learned that too.

Thank you very much guys. This input is very important to me.

[Neejay]

Ok this is kinda confusing hehe are you talking about me? And yah I did some more research today and look at the compressor maps, at 10psi with my setup I should full boost at around 3500 but I guess Il find out by the end of the month. And yes it is a straight T4 I learned that too.

Thank you very much guys. This input is very important to me.

Where did you get these maps from? I'm hella confused right now

[Neejay]

As long as the A/R isnt too big, it should spool up decently. I'm guessing somewhere after 4000rpm to make 10psi. (I just pulled those numbers out my arse based on stuff Ive read.)

Neejay, T3 turbines dont come in 0.68 A/R and T04E wheels dont come in 52trim. What kinda weird turbo is that?

hmm...after examining it, either one of 2 things happened:

1.) The guy lied about the turbo (said it was a 52trim/68AR - I paid $375, rebuilt professionally with 0 miles on it)or2.) He didn't know what he was talking about (and I highly doubt this, from our conversations).

The compressor side has "Garrett A/R 50," and the turbine housing side is a "Turbonetics 20357 (.48 A/R)". Does this mean its a 50 trim/.48 A/R?

After a little more research, if it is a 50 trim/.48 A/R, my limit would be about 300hp. I still need to figure out where would the RPM range kick in...

[S13FX]

Here you go buddy this should help a lot of people.

http://64.225.76.178/catalog/compmaps/fig12.html

[C-Kwik]

Ok this is kinda confusing hehe are you talking about me? And yah I did some more research today and look at the compressor maps, at 10psi with my setup I should full boost at around 3500 but I guess Il find out by the end of the month. And yes it is a straight T4 I learned that too.

Thank you very much guys. This input is very important to me.

The compressor map will tell you very little about when you wil hit 10 psi. The turbine has the boggest influence here. The compressors influence is limited to the rotational weight of the wheel itself and it's efficiency as pressure and air flow climb. The latter being an issue of aerodynamics, which would be quite difficult to calculate without knowing what the turbine and motor are doing. It's not worth trying to calculate this on our level though. Focus on the turbine trim and A/R for your best indication as to how the turbo will spool.

[C-Kwik]

After a little more research, if it is a 50 trim/.48 A/R, my limit would be about 300hp. I still need to figure out where would the RPM range kick in...

A 50 Trim T04E turbo is much more capable than 300 HP on a KA. The A/R on the compressor side doesn't have much effect. The 50 Trim would probably push out at least 450 HP if the Engine and fuel system can adequately handle it.

[WDRacing]

I agree, if it's a .63 AR or bigger hotside. The .48 will choke it. I think you and I are the only people on Nico that aren't afraid of a little lag Chano. You know what they say about the size of a mans toys

WD

[Neejay]

I agree, if it's a .63 AR or bigger hotside. The .48 will choke it. I think you and I are the only people on Nico that aren't afraid of a little lag Chano. You know what they say about the size of a mans toys

WD

What do you think it'll choke it down to? I hate this guy lied/didn't know what he was talking about. Jeez. He claimed it was .68, but the turbonetics part# is that of a .48.

[S13FX]

Well I plan on redoing my whole head, just basically a stock fresh rebuild replacing the valve seals and such, but I'm also debating on a whole solid lift conversion too.

I know that the drop off at higher rpm on our engine has to do a lot with our heads, so I might even get a mild port and polish.

But I was wondering, I wouldn't really mind a little lag at all if maybe I can get the thing to produce some decent power all the way up to at least 6500. I know last time I dynoed my SOHC N/A mode I quit making any power at like 5900. I'm still learning a lot of this stuff but I am a very fast learner and I always take any advice I can and apply it when or wherever I can.

[WDRacing]

Ok, I'm re-examining what I wrote and what I know about the T4. The T4 doesn't come in a .48 AR hotside. The smallest IIRC is a .63. I was thinking it was a hybrid again...lol. Ok, so its a full T4 with a 50 trim, you're looking at a turbo good to 500 easy. I made 498WHP on my RB20 with almost this exact turbo. I had the .81 AR though, only real difference...and a BB center.

You're good man, toss that dude on, crank up the boost and toss a rod or two...lmao

[Chezedik]

Hey, don't forget me, I have .63. Then again it is only stage 1.

[C-Kwik]

I agree, if it's a .63 AR or bigger hotside. The .48 will choke it. I think you and I are the only people on Nico that aren't afraid of a little lag Chano. You know what they say about the size of a mans toys

WD

I tend to blame the Gran Turismo games for that one. Some of the monster turbo cars you can build have exceptionally bad lag with their biggest turbo kits. While it's possible to get such lag, if you size correctly, it should not be that bad. What's worse is the car does not look like it's accelerating at all until boost comes on. Cars with big turbos will still accelerate much like a NA car until boost hits. The relative difference can be high, but certainly not that bad. To an extent lag rewards you with more power. Case in point, my friend had a Supra TT. 320 HP at the flywheel with some 12 psi out of the factory turbos. Slapped on a HKS T04R single turbo kit and ran 14.5 PSI. 450 HP at the wheels (should be over 500 at the flywheel - probablt at least 529). That's some 200 HP out of 2-3 psi of extra boost. There was noticable lag at lower RPMs but any decent driver should be able to keep this car in the powerband. With some higher boost levels, this kit has reported over 700 RWHP on some Supras. Efficiency on the compressor and turbine sides can yield some big gains. Though, on the Supra, a chunk of the gain is likely in the manifold as the stock mani's are horribly restrictive. But the majority is still on the turbo.

Consider also that the GT games also seemed to exaggerate the ramp up to full boost. Tended to see on/off switch like responses. This is not typical of good turbo set-ups. There is still a relatively gradual boost ramp-up, even with large turbos. Once you're over the boost threshold, response should still be pretty good as well.

Perhaps they are not afraid of lag either...they may be afraid of big power.

[WDRacing]

With my turbo, the TO4E not the R I had alot of lag, but I consider lag until I get that flash spool. I had a good 8-9 psi from 3000 on, it just doesn't feel like much compared to the 20+ when she finally kicks in. Makes is feel like nitrous, which makes the lag feel alot worse then it really is. In the end, I'll make more power more efficiently...

WD