Jump to content
SAU Community

T4 HIGHFLOW on R33?

WLD747

By WLD747,
in Engines & Forced Induction

 Share

Recommended Posts

RS500 Experienced

RS500

Posted
Posted
Originally posted by WLD747

What do people reckon if i get a T4 HighFlow for a street use car.  would it be a bit laggy?  I want to run 16psi on stock internals.

My mods are below:

R33 2.5L, Stock Turbo, FMIC, 3'' Exhaust System.  

Would it be fun to have as i have a large cooler.

Cheers

AK

It would depend on what specs the turbo is, but yeah, if you pick the right combo, it can be heaps of fun :D

Although, with a larger turbo and higher boost, you'll definitely have to pay some attention to the fuel system, otherwise the motor will go BANG!!!

//RS500.

JimX Grand Master

JimX

Posted
Posted

The previous owner of my car said the turbo on it was a 450hp T04. The guy at Garrett told me it was a T04E when I asked him what it was (I didn't say "Is this a T04?")

Since then though, I've discovered that most other people with T04's have an external wastegate. Mine is internal, so now I'm thinking I just have a T04 compressor cover and who knows what exhaust housing, which looks too small for it.

Small exhaust housing and internal gate aside, it goes really well. Starts spooling at around 2000rpm, and full boost (15psi) at 4500. Which is a little laggy, but not terrible by a long shot. It still feels quite responsive, and I hope to improve it some more with an adjustable exhaust cam gear in the near future.

It's doing well enough now to max out my AFM, which actually surprises me. I'm now thinking about increasing the exhaust housing size to fatten out the power curve a bit (not necessarily increase it).

Nrage33 Community Regular

Nrage33

Posted
Posted

Yea i've got one...hi flowed T04, stainless steel wheels...I am told that running absurd amounts of boost is no problem with hi-flowed turbos. i've had it up to 15psi at times...now it makes 185rwkw on 10psi which is just nice for my daily driving. For real good results, an aftermarket ecu would help, but i'm only running an S-AFC, and with something like a rising rate fuel regulator, pushing 220rwkw could be done easily i think...just turn up that boost!

JimX Grand Master

JimX

Posted
Posted

I've got stock injectors and the AFM is maxing out before the injectors. The injectors get up to 93% duty though, so they are being upgraded along with the AFM anyway. A rising rate regulator should do the job well enough for a mild power increase.

BOOSTD Mentor

BOOSTD

Posted
Posted
I've got stock injectors and the AFM is maxing out before the injectors. The injectors get up to 93% duty though, so they are being upgraded along with the AFM anyway. A rising rate regulator should do the job well enough for a mild power increase.

I found that my PFC indication of 90% injector duty cycle was actually 100%, any addition of fuel made no difference to Air fuel ratio's

Nrage33 Community Regular

Nrage33

Posted
Posted

hey wld747, my boost starts at about 3500rpm...n yea, higher boost seems to help the turbo do better. the power really comes on after about 5-6psi. I only just found that out. works almost like a vtec

The rising rate fuel regulator will even out the fuel maps so that your air flow meter voltage doesn't max out, allowing you to run more boost. My car experiences boost cut at 12psi now becasue of this, so it's been tuned down to 10psi. the fuel regulator will do away with this boost cut problem (so says gavin wood)

Before I put my FMIC on, I was running 15psi momentarily with no problems, the car made 200rwkw back then...now it makes 200rwkw on 12psi.

basically, just get an S-AFC plus a fuel regulator, and u should be fine. 16psi will be no sweat, if that's what u want.

  • 5 weeks later...
WLD747 Experienced

WLD747

Posted
  • Author
Posted

anyone know if most T04 turbos have internal or exteral wastegates?

and what costs have people had when putting a T04 onto their RB25.

I got some questions also need answering so please help.

* I need a new exhaust manifold to put the turbo on! Right?

* Do i need new oil / water lines

* Whats the wastgate part?

thanks in advance

ak

R31Nismoid Grand Master

R31Nismoid

Posted
Posted
anyone know if most T04 turbos have internal or exteral wastegates?  

and what costs have people had when putting a T04 onto their RB25.

I got some questions also need answering so please help.

* I need a new exhaust manifold to put the turbo on! Right?

* Do i need new oil / water lines

* Whats the wastgate part?

I got a t4 on my RB25... and it's for sale too at the moment :D

Did you ever come on a vic cruise up until approx 4 months ago???

t4 turb's are external wastegated is you have a true t04.

But i have a t4... with a t3 rear on my RB25.

so with the t3 rear you dont need an external wastegate :D

So my setup is like JimX.. t4 core/front housing.

and the t3 style rear end.

Most people think that when you say t3/4 (which ours are) that people mean a t3 CORE machined out to fit t4 wheels in.

You might be able to fit it to the stock manifold.

From what i've seen on a number of cars lately... anything is possible with a bit on enginuity (sp)

As for response same as JimX, it was a little laggy but overall not too bad.

13psi at 4200rpm or so.

and down at BMT we made a lazy 203rwkw on 13psi.

but i reckon the turbo wasnt near it's efficiency range at all as we bumped it to 15psi quickly and gained 30rwkw.

But then the fuel system wasnt too happy with that and needed more than just a fuel pump. So i'd suggest injectors as well as a fuel pump.

little bit more boost, about 17-18psi.

and then it's REALLY get up and move.

I reckon go for one! Is you set it up right as RS500 said then you wont have a problem at all with it.

and they are cheap to rebuild too :P

dont forget mine is for sale :) :headspin:

Nrage33 do you have an internal or external wastegate?

ash

  • 2 weeks later...

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • Kapr
      "Cheap" bolt on turbo on RB25DET NEO

      By Kapr 路 Posted

      Ok guys thank you very much. GCG highflow it is then 馃檪 
    • JC71
      98 R34GTT 4k engine stumble

      By JC71 路 Posted

      forgot to mention that when it does this it does not kill the engine, but I have not kept the pedal down long enough to let it, as I see no reason to beat up on it as its got to be something simple, small and dumb causing this.  And as soon as I let off pedal, the engine returns to its normal super smooth operation and rpms re-stabilize quickly, once below 4k. 
    • JC71
      98 R34GTT 4k engine stumble

      By JC71 路 Posted

      neither stumble or cut really seem to be an appropriate term....hard to explain its like a rev limiter but at 4k, but it violently shakes engine and entire vehicle as the rpms will not rise over 4k, even with slow acceleration. as soon as it hits 4k, it sounds like entire spark is lost entirely. plugs were 1.1 which I used as such, but later put in new plugs gapped down to .8 changed back after issue arose when I replaced the coils, still does it with either plug gap...damn and it was all running so good.
    • TurboTapin
      Why am I hitting a power wall with my stroked RB25?

      By TurboTapin 路 Posted

      Oh how times have changed! I actually lean it out relative to my water/methanol injector duty cycle. The methanol adds a lot of fueling and you can then lean it out even more due to reduced knock. 
    • Dose Pipe Sutututu
      Why am I hitting a power wall with my stroked RB25?

      By Dose Pipe Sutututu 路 Posted

      Yeah my thoughts are the same, a well thought out WMI setup, would be slightly ahead of just straight E85 and you're also chemically intercooling the charged air, dropping it even further. This is why you need to add so much more fuel as soon as you spray. I remember someone taking me through their set up before (Dennis, has a R33, lives around Cabramatta - no idea if he's still around on this forum). He would target AFR 10:1 on 98, then as WMI ramped on, AFR would lean back up to 11:1. Amazingly, he did this all through his PowerFC, a relay to cut power to his EBC solenoid if there was not enough line pressure on his WMI kit. And of course, if there wasn't any boost made above gate pressure, you wouldn't be accessing the load cells with heaps of timing for WMI. One downside to that rudimentary setup, once the WMI came on, the EBC would unleash the dragon, and of course all the timing. Tyres would fry lol.
脳
脳
  • Create New...