Replacement Turbo - What To Get?

[Bill]

Well the turbo on my R34GT-T has bit the dust and I need to get a replacement fairly quick.

Rather than replace it with a stock turbo I was thinking of something with a little more performance, but Im not sure where what so I would apprecieate some advice. This car is my daily drive and I do a fair bit of open road crusing so I dont want anything that is laggy or peaky or sucks the juice down. So a bit more performance but not at the sake of useability.

Current Specs

- RB25 NEO DET

- eBoost

- FMIC

- PowerFC

- Pod

- Hi flow exhaust

- Spitfire coil packs

What I want

- Bolt on, no messing with makeing custom mounts or anything

- Mild performance improvement (currently 200kw at the wheels)

- Works with current mods, dont want to upgrade other bits like fuel pump, internals

- Dont want it to use a lot more fuel

- Dont run out of puff (old turbo started to loose boost from 4200)

- Daily driver so not peaky or laggy. Smooth with boost over most of the range is good

So guys, fire away with the suggestions!

Edited December 16, 2011 by Bill

[W0rp3D]

hypergear, your pretty much either limited to the smallest hi flow he has or a bigger one with less boost as your injectors, afm and fuel pump are going to be at there limit, i maxed my injectors and afm out at 230 rwkw but that was over tuning the afm and hitting 100% duty cycle on the injectors neither of which is recomended.

[HtwCHACtkh]

GT2835 Pro S or Hypergear come to mind quickly. I don't think there are any bolt on Kando's which seem to be all the rave at the moment.

[luvpsi]

Nah no bolt on kando turbos all need external gate and v band dump

[wolverine]

Hiflowed stock turbo such as the GCG hiflow are the only true bolt on turbos everything else requires more work to fit. There are no catches or hidden surprises if you bolt your rebuilt turbo back in the same spot.

[R31Nismoid]

What I want

- Works with current mods, dont want to upgrade other bits like fuel pump, internals

- Dont want it to use a lot more fuel

- Dont run out of puff (old turbo started to loose boost from 4200)

Put a stock turbo back on there and setup the boost control better.

There is no way the turbo should be falling over from 4200rpm for a start. That's just a poor setup.

And if you don't wanna upgrade fuel pump, AFM, injectors - forget upgrading the turbo. You can't do one, without the others.

[HtwCHACtkh]

Nah no bolt on kando turbos all need external gate and v band dump

That's really not too bad. It would definitely make it competitive pricewise if you're going to keep the standard exhaust manifold.

+1 to what R31Nismoid said.

If you're willing to spend some cash then a lot of doors open.

[luvpsi]

That's really not too bad. It would definitely make it competitive pricewise if you're going to keep the standard exhaust manifold.

+1 to what R31Nismoid said.

If you're willing to spend some cash then a lot of doors

Open

All in all without including injectors and afm and aftermarket ecu a kando setup will cost just over 1k with the right contacts

[Mick_o]

+1 on highflowing what you got.

Bolt it back on retune it with some more boost maybe expect 230kw atw max id imagine

[R31Nismoid]

Yeah but so what?

You get a turbo that will have all the lag, but no power because you are limited to 220-230rwkw (or so) due to needing ALL the other supporting modifications.

Kando/hi-flow - all will go over 250rwkw with ease. No point having a bigger huffer for no gains.

Cheap or not, its pointless when the OP has clearly stated he doesn't want spend anything more on any supporting mods when a stock turbo is $350.

Also change the turbo = need a retune $$

[luvpsi]

What I was talking about was hot side only of course he needs the supporting Mods but I was talking to aeqel not the OP

[chris_82]

If he was to run a bigger turbo but ran the same psi setting as before it shat itself does it still need a re-tune ? Could always get the supporting mods later on.

[Mick_o]

Yes because a bigger turbo pushes a larger volume of air

If he was to run a bigger turbo but ran the same psi setting as before it shat itself does it still need a re-tune ? Could always get the supporting mods later on.

[Bill]

hypergear, your pretty much either limited to the smallest hi flow he has or a bigger one with less boost as your injectors, afm and fuel pump are going to be at there limit, i maxed my injectors and afm out at 230 rwkw but that was over tuning the afm and hitting 100% duty cycle on the injectors neither of which is recomended.

I wouldant mind another 20 rwkw, as long as the difference between that and a stock item isant silly.

GT2835 Pro S or Hypergear come to mind quickly.

Thanks

Hiflowed stock turbo such as the GCG hiflow are the only true bolt on turbos everything else requires more work to fit. There are no catches or hidden surprises if you bolt your rebuilt turbo back in the same spot.

Never considered hiflowing the existing turbo.

Of course that means I would have to have my current one rebuilt.

Anyone have an idea on what it costs to have a turbo rebuilt and hiflowed?

Also whats the downsides?

Put a stock turbo back on there and setup the boost control better.

There is no way the turbo should be falling over from 4200rpm for a start. That's just a poor setup.

Interesting....

Its not falling over as such, just boost drifting off as revs rise. I was told by several sources that is to be expected with a stock turbo when uppped to 1bar. (have attached dyno chart with boost if anyone wants to comment)

And if you don't wanna upgrade fuel pump, AFM, injectors - forget upgrading the turbo. You can't do one, without the others.

Was told by several sources I can upgrade slightly without doing the rest hence asking for advice in this thread.

For my current use I would like some more power, but cant justify a large cost for a big jump.

+1 on highflowing what you got.

Bolt it back on retune it with some more boost maybe expect 230kw atw max id imagine

Who would repair and hiflow a turbo?

Yeah but so what?

You get a turbo that will have all the lag, but no power because you are limited to 220-230rwkw (or so) due to needing ALL the other supporting modifications.

Kando/hi-flow - all will go over 250rwkw with ease. No point having a bigger huffer for no gains.

Cheap or not, its pointless when the OP has clearly stated he doesn't want spend anything more on any supporting mods when a stock turbo is $350.

Also change the turbo = need a retune $$

Ok, so hiflowing will make it laggy?

I would not call an extra 20 to 30 rwkw no gain (depending on the cost above putting a stock one back on)

While I dont want to get cought up in upgrading everything, I did factor a retune in, I assumed it would be necessary if I put a stock or different turbo back on.

Thanks for all the opinions guys, they are apprecieated.

[Bill]

when a stock turbo is $350.

What?

$350 for a stock turbo?

I thought they would be a lot more than that.

Is that new, second hand, refurbished?

[R31Nismoid]

You were running 15psi through the stock turbo?

No wonder it shat itself... No more than 11-12psi should be run.

And yes, hi-flowing will make it laggier, you are putting in larger wheels.

$350 is for second hand stock turbo.

Realistically to put a decent hi-flow, ball bearing etc, $1600 is the cheapest you'll get. You can get bush bearing ones for around $800 but their performance is not as good and for 220rwkw there is little point in spending $800, then $500+ for the tune only to gain 20rwkw and more lag.

[JustinP]

T88. Anything smaller is ghey.

[wolverine]

Per my post GCG hiflow stock turbos.

Search SAU and there are numerous threads on hiflowed turbos. The major upside is that they it will bolt straight on but will still require supporting mods to get the best out of them.

There are so many other options out there but each option has differing levels of cost and difficulty.

Best advice I can give is organise a decent budget and do it properly after doing lots of reading here at SAU. If you are going to fiddle around with half measures save your self some pain and just buy a second hand turbo.

[GTScotT]

Get a basic high flow from Hypergear using the stock housings.

It will mostly bolt back into place with the exception of the oil feed which he will supply you. With what he will send back it WILL bolt back on easy enough.

This will be a rough maximum of 250kw worth of power but an easy 220 with the stock AFM and injectors in place. You will need to remap your ECU if a stock turbo does not go back on.

Expect to pay $960 for the highflow job and $1350 for the tune.

[wolverine]

i can get a tune for $1349 you get ripped.