Best Allrounder Turbo (Upgrade) for RB25DET

[b0neR]

I was just wondering what peoples opinions were on the best street package turbo installation for a RB25DET. Im talking in terms of a quest for great response, a broad but sweet power band and not over-the-top power. Present your ideas and constructive criticism here for everyone to view.

Cheers,

Tom.

[predator]

HKS GT2540 is what I want for my car bit later down the track which is meant to offer good power at decent revs and all round street performance. Depends how much power you are chasing.

Of course if you hi-flow a turbo to "pick your own" characteristics and build it to suit how you will end up driving.

[b0neR]

Anyone know how much power you get out of a 2540?

[turbomad]

What I'd like is a Garret GT28, A/R-.70 comp/.64 exh, it requires an adapter to bolt to the RB25 manifold but will make around 230rwkw with around 13-14psi and will spool up pretty close to the factory turbo. The GT30 will make more power but with some extra lag.

[benm]

I've read that just hiflowing the stock turbo gives nice results.

[doxximus]

i'd like to have one that would do moderate power upgrade and some lag like u said the gt30 would make, the feeling while driving would be just awsome

[Sydneykid]

Hi b0neR, specs follow;

Hi GT28 = 320 bhp

HKS 2540 = 350 ps

GCG Stage hi flow RB25DET turbo 350 bhp

Based on personal experience I would go for the GCG hi flow, you get basically a new turbo (all the wearing bits are upgraded/replaced) plus there is an upgrade path. We find almost standard spool up, noting that we always tune cars with turbo upgrades not simply fit them.

Hope that helps

[Sydneykid]

Hi guys, me thinks someone at Zoom and HPI have been reading the posts on this forum. There are acouple of articles in the latest issues that refer to questions and discussion we have been having lately. The 2540 versus 2530 is in issue 30 of HPI.

Maybe we should be charging royalty, how about it Martin and Ben?

[benm]

what are the typical costs for the above specs above sydneykid ?

[Sydneykid]

Hi benm, new rrp follow

GT28 = 320 bhp = $2,200

HKS 2540 = 350 ps = $4,790

Hi flow RB25DET turbo 350 bhp = $2,000

As usual all prices are negotiable, so bargain with your local supplier.

Hope that helps

[predator]

If u can source a 2nd hand turbo in GC from japan you can get prolly half the new price for a HKS.. but yeah...

[T0nyGTSt]

HKS2530 seems to be a good choice.

Sydneykid has something against the 2540.

Maybe one of the GT-RS might be good.

T.

[Jay95R33]

We (Canberra people) just got a GCG rep for the ACT region. Met he the other day and he seems like a good bloke and really knows his stuff.

I might have to have a chat to him when/if I get my turbo done.

SydneyKid - that price for the GCG highflow, was that with ball bearing or thrust bearing? I'm thinking thrust...

Cheers

J

[b0neR]

Does anyone here have or know someone with a HKS GT Turbo installed on there RB25? I have also heard that the 3037 is not a bad choice if large power is still wanted, coupled with all the right parts under the hood would this be a viable setup for daily drving??

[Guest Works Auto]

I think the GT30 is the way to go.

If you go for the one with the .63 exhaust housing there will be *** all lag on a rb25.

These turbo's are a proper performance turbo so its made for the job.

[aybee]

2835R

[T0nyGTSt]

Originally posted by aybee

2835R

Ack!

If you're made of money I suppose...

T.

[Sydneykid]

Hi T0nyGTSt , re "Sydneykid has something against the 2540". Hey, I'm not the only one, ask around. If you want another written opinion, have a read of HPI issue 30 (the current one).

Hi Jay95R33, it was a ball bearing hi flow.

Hi Works Auto, re "These turbo's are a proper performance turbo". Give me a brake, Trust T78/T88 would be considered "performance turbos" right? That's how Trust promote them, very heavily. Well they are basically a Mitsubishi Canter turbo with some minor aerodynamic mods. Don't believe the publicity machines, they just want your money.

Hope that helps

Hey, Martin and Ben maybe that's what you should do in a future issue of Zoom or HPI. Rip apart a mega cost turbo (Say HKS or Trust) and compare it to the same basic turbo from the original manufacturer (say Garrett or Mitsubishi). Then stick it on a car and run them up on the dyno. I'd like to see that.

[Jay95R33]

Originally posted by Sydneykid

Hi Jay95R33, it was a ball bearing hi flow.

I like that :uh-huh:

Basically a brand new ball bearing turbo that has been matched to the RB25det and can flow upto 350hp for $2000 !!

I'll be looking very closely at that when the time comes.

Just one last question SydneyKid (I promise ) - from your experieances, how effeicant are these highflows at around 13-14psi?

The thing that worries me about the HKS' and others, is that apparently they only start showing their balls at 16psi+

If I get a replacement, I wouldn't want to go higher than 14psi, but would want to get good flow at that level... Does that make sense !!! Basically I'd want to get the most power I can at 14psi with good/strong mid range power and if possible have it spool up close to the factory turbo.

Sort of like having your cake and eating it too

Cheers

J

[T0nyGTSt]

Well the prob. is that these turbos often run max. efficiency only at 1.2bar+

Now is this bad? No.

They are doing significant power at lower psi.

I'm doing more power at less psi!

Can't complain about that.

T.