Rb25 Replacement Turbo? High Flow?

[sriver killer]

hey guys

i got an r33 gtst manual with the usual bolt ons

healthy stock rb25det,

3.5 inch turbo back stainless

front mount cooler and water spray

12 psi

4.363 diff gears

i've got a budget of around 1600, looking for a replacement turbo

one option that ive considered is a hypergear high flow

do highflowed stock turbo's make a big difference over the standard t3?

much gain?

normally the rb25 turbo's are limited by the ceramic compressor wheel, so you can;t boost it over 12-14 safely

if i got a high flow, due to it having a steel wheel would i be able to wind it higher than the standard t3?

supporting mods?

i think the efficiency of the turbo peaks out at 18-20 psi

[gotRICE?]

Youd need ECU, AFM, Injectors and Fuel pump + Tune. $1600 wouldnt get you 25% of that, especially seeing as that budget is for the turbo itself.

Edited June 7, 2009 by gotRICE?

[AFTDRK]

$1600 could get you a remapped ecu, a high flow fuel pump, high flowed injectors and a Z32 afm.

Hypergear do T3 highflows for $800

high flowed turbo will be good for around 260kw atw's

and yes you can run more pressure than the standard spec turbo

Edited June 7, 2009 by AFTDRK

[conan7772]

hey guys

i got an r33 gtst manual with the usual bolt ons

healthy stock rb25det,

3.5 inch turbo back stainless

front mount cooler and water spray

12 psi

4.363 diff gears

i've got a budget of around 1600, looking for a replacement turbo

one option that ive considered is a hypergear high flow

do highflowed stock turbo's make a big difference over the standard t3?

much gain?

normally the rb25 turbo's are limited by the ceramic compressor wheel, so you can;t boost it over 12-14 safely

if i got a high flow, due to it having a steel wheel would i be able to wind it higher than the standard t3?

supporting mods?

i think the efficiency of the turbo peaks out at 18-20 psi

I had a high flow on an RB25/30 and it maxed out on 17psi.

Pushed out 284 rwkw ,974 Nm of torque and full boost at 2800 rpm.

Brutal instant power, nasty wheel spin in 1st and 2nd.

Don't know who flowed it though as I bought the car with it already on. Got 60,000 km's out of it.

Before I did my engine rebuild my RB25 was stock , all but FMIC, Haltech ECU , 500 hp fuel pump and the high flow.

It had 247 fwkw or 190rwkw.

Gotrice is bang on with what's needed though my injectors were stock, but my fuel pressure was high (70 psi ) flat out.

[hypergear]

For R33 Turbos I actual recommend use our TR43G2 or TR43i for just $200 extra. your stock R33 worth about $300 once its sold. So you only end up paying about $150 more on a custom dump pipe.

[sriver killer]

even with a high flowed stock turbo a tune would be necessary?

shouldn't the afm compensate for this? it wouldn't be a huge jump up from the stock turbo

i wouldn't mind going to another turbo

just that the convenience of having everything bolt back up no fabrication needed is there if i get it high flowed

Edited June 7, 2009 by sriver killer

[sriver killer]

i've heard from guys running high flowed stock turbo's on factory ecu's with no issues at all,

what would be the max boost you could push the turbo to on stock ecu?

[Lachlan33]

Pretty sure the car would run on a highflowed turbo but it wouldn't be running very happily. You would need at least a piggy back unit like a Safc to try alter the fuel map to correct for the extra airflow. Even just a highflow is going to be freaking out a stock ECU quite a bit.

[geraus]

when my car was untuned with basic mods like fmic full exhaust etc... i had mine running 12pounds.. with a hypergear highflow... it was running madd!

Now my car tuned with injectors and z32 and pfc... im doing about 240kws..

[sriver killer]

nice mate,

did you encounter any issues at all with running the high flow at that boost? much difference over stock?

ever try to boost it up?

[godismyhomie]

You can get your turbo high flow with a bush bearing VL turbo high flow core.. good for 220-230rwkw... you can just run a SAFCII and be able to achieve this

[sriver killer]

interesting

just curious, what differences are there between the vl turbo t3 and the rb25?

[lighty01]

hmm.. sorry to hijack but has anyone looked into the kkr480? its roughly the same price as a high flow and is a straight swap....

[kwickr33]

hmm.. sorry to hijack but has anyone looked into the kkr480? its roughly the same price as a high flow and is a straight swap....

I Had one while back. Definitely not a straight swap mate. Water fittings are different, Dump pipe needs to be custom made, intake pipe is different, I had a boost spike issue after installation. It must be externally gated. Performance wise its not bad.

[Lachlan33]

While I have had no personal experience with KKR turbo's, I would advise against them. If your chasing mild gains a High flow would suit you fine. If you are the sort of person who 6 months down to track is going to want more, then invest your money in some decent supporting mods, then just wait till you have the money and chuck a proper turbo on there. Going cheap now might cost you more in the future if you decide you want more power down the track.

[Ultimategtr]

Can run stock ecu on hiflowed turbo's.. however dont be compelled to wind up the wick.. as your compressor would be at least 10mm bigger then the stocker.. which would flow craploads more air.

I myself run a bush bearing hiflow with an rx7 core/exhaust setup and only run 5-6psi. Laggy, but way more hit then my stocker @ 9psi.

[geraus]

Hey there, Yeh you can run your highflow turbo with your stock ecu but beware.... once your boost goes past 12psi..... you will hit R&R and therefore you will require your spark plugs to be gapped at 0.8mm and will start miss firing past 3-4rpm.... it will miss..

[geraus]

Also the power was more diffrent, boost felt really good (this was when it was untuned) to.. so yeh.

[godismyhomie]

i achieved 228rwkw with a highflow stock ecu with SAFC on 12psi

[sriver killer]

it might be an idea to get a safc or a nistune

i'm gonna look into things further