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Factory Response Aftermarket Turbo - Rb25

colourclassic

By colourclassic,
in Engines & Forced Induction

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colourclassic Mentor

colourclassic

Posted
Posted

As title says, what is the absolute most responsive aftermarket turbo available for an RB25?

The factory turbo on R33's delivers great response and driveability and can deliver around 10psi of boost safely without spinning the ceramic turbine wheel off.

If not for the ceramic turbine wheel, would I be correct in assuming that the factory turbo would be able to deliver roughly 14psi without losing efficiency, and make around 230rwkw?

Is there a turbo with similar A/R's, trims etc to the factory Garrett but with steel/inconel/alloy wheels?

If so name it please!

hypergear Grand Master

hypergear

Posted
Posted

We can high flow your standard turbo that has similar response to factory, while making a lot more power.

That is 20psi by 3400RPM maxing 320rwkws on E85. We usually seeing around the 260rwkws on P98 fuel.

Every thing looks stock standard, and bolt back on the way it was. No fabrications required.

colourclassic Mentor

colourclassic

Posted
  • Author
Posted

I just sold my #hypergear highflow because it was too uneconomical for me to run. The power was great, but I don't need or want "20psi by 3400rpm". I can't afford the fuel costs or supporting mods to run 320rwkws.

I literally want the little factory Garrett but with a metal turbine wheel, so I can run a measly 12-14psi and make a little over 220rwkws on PULP with a PowerFC. I want full boost at ~2500rpm like the stock turbo!

:)

Blackkers Experienced

Blackkers

Posted
Posted

I've got one on an RB25det as a street car. With boost leaks it will make 20psi by about 3300RPM uphill in 4th.

you never have to change down gear above 50km/h in 4th.

but it doesn't respond as well as the stock turbo. The factory turbo makes the car feel like a small block chevy compared to the highflow. But it has major drawbacks.

If rebuilt to standard specs with a better bearing cartridge and steel wheels I'm sure you won't lose much response and on e85 you could push probably up towards 16-18psi. Remember ceramic/nylon wheels are lighter (I assume) which helps transient response

  • Like 1
colourclassic Mentor

colourclassic

Posted
  • Author
Posted (edited)

The factory turbo makes the car feel like a small block chevy compared to the highflow...

Yes!! And that's what I want!

I've had a 270rwkw Skyline, and as fun as it was, it was more fun around town (where I drive most) with the stock turbo. Next to no lag, and enough power to have fun.

Edited by colourclassic
colourclassic Mentor

colourclassic

Posted
  • Author
Posted (edited)

Just send it to Hypergear and ask for it to be rebuilt to standard Nissan specs but with steel wheels and not high flowed.

Can hypergear do this?

Edited by colourclassic
hypergear Grand Master

hypergear

Posted
Posted

Stock turbocharger was making 10psi by 2800RPM. Any thing that build boost faster results in compressor surges on partial load.

Most of the high flows I've done were built to generate about 260rwkws on P98 fuel. I can build some thing smaller to match factory boost curve, that works with standard ECU also.

By the way, The original turbocharger that I've high flowed for you was a Neo turbo. R33 turbine housings are smaller, in comparison is 500RPM more responsive.

Munkyb0y Grand Master

Munkyb0y

Posted
Posted

A good used HKS 2535 may be what you need.

Crazy response, but will choke at top end. 230rwkw type of power.

I think they can handle high teens worth of boost.

or for a little bigger look at the HKS GT-RS

wolverine Grand Master

wolverine

Posted
Posted

Stock turbocharger was making 10psi by 2800RPM. Any thing that build boost faster results in compressor surges on partial load.

Most of the high flows I've done were built to generate about 260rwkws on P98 fuel. I can build some thing smaller to match factory boost curve, that works with standard ECU also.

By the way, The original turbocharger that I've high flowed for you was a Neo turbo. R33 turbine housings are smaller, in comparison is 500RPM more responsive.

This^^

colourclassic Mentor

colourclassic

Posted
  • Author
Posted

Stock turbocharger was making 10psi by 2800RPM. Any thing that build boost faster results in compressor surges on partial load.

Most of the high flows I've done were built to generate about 260rwkws on P98 fuel. I can build some thing smaller to match factory boost curve, that works with standard ECU also.

By the way, The original turbocharger that I've high flowed for you was a Neo turbo. R33 turbine housings are smaller, in comparison is 500RPM more responsive.

If you can build something which will match the factory boost curve/response, please PM the info Stao! I'd prefer a roller bearing CHRA too if possible!

Dose Pipe Sutututu Grand Master

Dose Pipe Sutututu

Posted
Posted

You know the bigger the turbo the more economical the car is? :)

You're not always on boost haha.

In saying that, if you're after response check out Borg Warner turbos. They're truly amazing however will burn a hole through your pocket

Ryno Experienced

Ryno

Posted
Posted

Sounds like you're after my setup...

MX Performance exhaust manifold (with 1" runners), External wastegate with HKS GT-RS turbo with internal wastegate removed and welded closed.

With this setup the turbo is just as responsive as stock ~ 5 psi at 2000 rpm, however it has around 280 rwkw. Economy wise, I average around 10litres/100km.

My car is a daily drive, so I wanted no compromises on driveability... Check out my build thread for more info...

http://www.sau.com.au/forums/topic/409509-rynos-r32-over-a-decade-and-counting/

  • Like 1
M@&k Community Regular

M@&k

Posted
Posted

There's also some companies offering bolt ons (exhaust side at least) for the GTX2860/63/67. Probably better off getting Hypergear to refurb a stock turbo, but throwing it out there for interest.

SonicPerformance is doing turbo with housing:

http://www.sonicperformance.com.au/Turbocharger-Upgrades/Nissan/Skyline-_dash_-Single-Turbo/pl.php

Kudos has a kit on GTX2867 only:

http://www.kudosmotorsports.com/catalog/garrett-turbocharger-kit-garrett-gtx2867r-nissan-skyline-r33-gts25t-r34-25gtt-rb25det-special-introductory-price-p-1459.html

hardsteppa Grand Master

hardsteppa

Posted
Posted

Currently running a td05-18g, previously a hypergear hiflow, on r33/rb25. Both good for comparable to stock response, for the OP i would prob go with Stao's offer to build u one for your needs. I like the td05 but not really worth the dicking around to get to fit.

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