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Rb25det Turbo Upgrade Gt2871

SL1D1N

By SL1D1N,
in Engines & Forced Induction

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SL1D1N Collaborator

SL1D1N

Posted
Posted

I have recently bought a gt2871r garrett and am putting it on my rb25.

Wat i have on the car

Frontmount

Aftermarket manifold

custom made dump pipe and full exhaust

pod to stock afm to turbo

custom water and oil feed lines and t3 to 28 adapter

boost gauge

safc I

Actuator on the turbo is at 9 pound i think but want to get it changed and tuned to 1 bar. wat else will i need,

will this all run ok? plug gaps be alright? and i have been told that i will need to restrict the oil flow to the turbo as there is too much and will where out seals quicker?

any comments, suggestions pointers are welcome.

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https://www.sau.com.au/forums/topic/171729-rb25det-turbo-upgrade-gt2871/
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R31Nismoid Grand Master

R31Nismoid

Posted
Posted

Well you havent told us what plug gap your running now.

So somewhere around a rock and a hard place is where you've put us :D

What did the turbo supplier tell you about it?

Some need restrictors, some dont.

You really need some sort of ECU before you go winding up the boost.

SL1D1N Collaborator

SL1D1N

Posted
  • Author
Posted
Well you havent told us what plug gap your running now.

So somewhere around a rock and a hard place is where you've put us :O

What did the turbo supplier tell you about it?

Some need restrictors, some dont.

You really need some sort of ECU before you go winding up the boost.

Plug gap is .8 and im just going to get a bigger actuator and use my air fuel control, that will work wont it. I only want to run it on 1 bar, stock ecu should be able to handle that??

BHDave Grand Master

BHDave

Posted
Posted

The turbo will have a restrictor built into the oil feed. If you are paranoid you can get the turbo end fitting on your new lines welded up and re drilled to a smaller size (i dont know the size off the top of my head, roughly .8mm from my very sketchy memory).

Otherwise you have no problem. plug gap is fine, do the fuel pump as suggested, safc will be alright for what you want to do but it will be a bit of a compromise.

Dale FZ1 Veteran

Dale FZ1

Posted
Posted

Exact spec (trim, A/R) of the turbo will determine both maximum potential output, and the torque DELIVERY. That delivery will be a big factor in how the clutch lasts, but not as much as how the operator looks after it. Hammering it off the line, clutching it regularly to big smoky slides will see it die fairly quickly.

FWIW, my 2871 based high flow running 13.5psi max and 225rwkW gave the stock clutch no problems transmitting the drive without slippage.

Spec dependent again, at 1 bar SL1D1N should be looking to a maximum potential output range between 210 - 240rwkW. That would be beyond the stock fuel system's capacity. And that is how he should view the fuel system - as a SYSTEM. Pump, injectors, pressure regulator. Changing FPR might bump up the max fuel delivery, but probably run into issues elsewhere in the load/rev range.

If the budget isn't there yet, I'd say stick with the 9psi actuator and tune the thing with the interceptor. 180-190rwkW should be the result.

If the finances ARE available, get either a Nismo/Tomei drop in pump, a set of bigger injectors like either the S15 450cc units or 555cc Nismos, and most importantly a decent ECU. Then slip the 1 bar actuator in and get it tuned. Depending on the ECU, may be able to eliminate the AFM.

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