HKS3240 on RB25 (yes another one sorry guys)

[muaythailuke]

Hey guys

Just wanted to know if anybody has ever used on of these turbos on an RB25?? I have a 3037s at moment and I think that will limit me to around 300rwkw and id really like to see 350+rwkw.

I was thinking the 3240 would make this sort of power without having too much more lag than the 3037 :confused:

All the necessary mod to support it like forgies, rods, cams, front facing plenum....... etc

Thoughts anyone???

[discopotato03]

From the HKS USA site the GT3240 (GT5982R in new speak) is a tad smaller in the turbine dimensions ie 58.7 x 54mm vs 60 x 55mm for your GT3037S . The compressor the former uses is an 82mm 54 trim GT40 series wheel . How they come up with the 580 PS power rating beats me . Also note that its sold with a .87 ARR T28 flanged exhaust housing .

You may be better off looking at the HKS version of the GT3040 which has the same turbine as your 3037S and a smaller (50 vs 54) trim 82mm GT40 compressor . Its still not a good match in my opinion but looks better on paper than the 3240 and has a few more turbine housing options .

What turbine housing does your 3037S have ?

Cheers A .

[muaythailuke]

Sorry dude should have said my turbo is accually a 3037 Pro s, internal wastaged, not the external gated 3037s. My turbo has the .87(? I thinks ?) A/R T3 flanged exhaust housing.

Righto these are the specs from the turbo we has mentioned straight off HKS USA website, now most of these number dont mean a great deal to me could someone please explain??

discopotato - why dont they look good on paper? Im still learning how you match all this stuff up :confused:

HKS GT3037 Pro S - 480 PS Output

COMPRESSOR:

-Wheel- 56 Trim - 57.0 Inducer / 76.2 Major

-Housing- 100 Inlet / 50 Outlet - 0.60 A/R

TURBINE:

-Wheel- 84 Trim - 60.0 Major / 55.0 Exducer

-Housing- T3 inlet / External GT-Pro outlet; 0.68, 0.87 A/R

HKS GT3240 - 580 PS Output

COMPRESSOR:

-Wheel- 54 Trim - 60.3 Inducer / 82.0 Major

-Housing- 100 Inlet / 60 Outlet - 0.60 A/R

TURBINE:

-Wheel- 84 Trim - 54.0 Major / 58.7 Exducer

-Housing- GT25 inlet / External GT30 outlet - 0.87 A/R

HKS GT3040 - 500 PS Output

COMPRESSOR:

-Wheel- 50 Trim - 58.0 Inducer / 82.0 Major

-Housing- 100 Inlet / 60 Outlet - 0.60 A/R

TURBINE:

-Wheel- 84 Trim - 60.0 Major / 55.0 Exducer

-Housing- GT25 inlet / External GT30 outlet; 0.61, 0.73, 0.87, 1.01, 1.12 A/R

[muaythailuke]

come on guys help me out here :bananaman

[whistla]

If and when you are in the process of selling the 3037proS, give me a PM

[discopotato03]

They don't look good on paper because of the size difference of turbine to compressor ie 60mm to 82mm = almost 27% , 15-20% is preferable . At least the 50 trim of the compressor helps .

I don't think you mentioned anything about AFM size/exhaust manifold type or if high performance cams are used . There are lots of options ie the cast HKS exhaust manifold/external gate teamed with the larger 1.06 ARR turbine housing . I would check for pressure drop across the intercooler as well .

The RB25 top end if its std may be lacking in the breathing dept so porting/cams/springs or the best option RB26 top end may pay off .

If your looking for a bolt on turbo solution I guess the XR6T's version of the GT3540R could do but its asking the turbo to do all the work probably with a highish boost threshold .

Cheers A .

[muaythailuke]

Thanks disco :thankyou: to answer some of your questions though. Car runs a MAP sensor so no AFM is used just a 4" intake pipe plus 4' exhaust, if I were to upgrade to a bigger turbo a tuned length custom manifold would be used, the head has been ported with uprated spring etc plus HKS cams with higher lift etc also plus a front facing intake plenum.

So how do I go matching turbo with the engine and the power/responce im after?