R34 Gtr Build

[JEM Dyno]

Here at Just Engine Management we've been lucky enough to be building the ultimate R34 GTR from front to back.

The owner knew from the start what he wanted but it needed extensive research and development to know whether is was even possible to achieve the specific performance characteristics he was asking for.

As most of you know, numerous big GTR's have been built over the years and with great results too so re-creating the wheel in some aspects of this build made things interesting.

With this GTR, the customer did not requested out right power but response and torque. One challenge was, can we make a single turbo setup that makes 450-500kw hit target boost at 2,500-3,000rpm? This answer will just have to wait.

This car started its life as a stock standard V-spec with a cat back exhaust system. So far the car has had it's original Z-tune kit fitted with a complete re-spray. Check (if you live in usa): Costco Weekly Ad, or Supercheap Auto Catalogue. The orignial brembo's have been replaced with 6 piston items with massive rotors and suspension has been replaced with JRZ RS coil overs with NISMO adjustable arms and supports.

Check out the pics and more information on our website.

Ph: 02 9618 6001

W: www.justenginemangement.com

E: [email protected]

[BOBBYr34]

Where are the pics!!!

[GTRNUR]

I like that... not chasing outright power but instead response. Yet its about a 700hp at the flywheel setup. I see a twin scroll turbine there with possibly a quick spool valve mounted between the turbine and the collector flange. Am I close? Hard to tell from such tiny pictures.

Are those Porsche GT3 or cayenne turbo brakes? Ive been contemplating doing the same conversion to my R34 as well.

[Beer Baron]

looks like a good project. lots of nice bits going it, so hopefully some good results coming out.

hey if it goes really well I might have to bring in my 32 for a tune. it's running motec too with a jun 2.7 and 2530s. very conservative at the moment and I'm keen to put in some boost and revs and some E85 for some decent power.

and yes, please take the time to upload some pics and info here (preferably some slightly bigger pics too).

[NYTSKY]

No quick spool valve. Its a very nice piece of design and engineering though

[JEM Dyno]

Here are some pictures guys.

Check out the collector design. Very unique thanks to John Skola

[SimonR32]

Looks exactly the same as a 6 boost t4 divided collector, just more fancy

[FineLine]

Looks exactly the same as a 6 boost t4 divided collector, just more fancy

What drugs are you on.

[mico]

Looks exactly the same as a 6 boost t4 divided collector, just more fancy

took the words out of my mouth.

[NYTSKY]

Looks exactly the same as a 6 boost t4 divided collector, just more fancy

Looks is as about as far as the comparison goes.

The amount of data that has gone into this one piece would make your head spin!!

[BOBBYr34]

The collector may look alot like other merge you see on the market, however you will not find anything like this anywhere, the purpose of this design is to achieve the perfect merge and at the same time extract equal quantity of waste gases without causing extensive disruption to the flow.

[BOBBYr34]

I like that... not chasing outright power but instead response. Yet its about a 700hp at the flywheel setup. I see a twin scroll turbine there with possibly a quick spool valve mounted between the turbine and the collector flange. Am I close? Hard to tell from such tiny pictures.

Are those Porsche GT3 or cayenne turbo brakes? Ive been contemplating doing the same conversion to my R34 as well.

They are similar to the cayenne turbo brakes, you can buy it as a kit with the adaptors.

[SimonR32]

Looks is as about as far as the comparison goes.

The amount of data that has gone into this one piece would make your head spin!!

The video of it posted was just of a collector with 3 pipes going into each side of a T4 flange

Just watched the video on youtube and didn't actually realise that it was only "50% complete" without any of the wastegate ports cut in etc

Edited March 12, 2011 by SimonR32

[GTRNUR]

They are similar to the cayenne turbo brakes, you can buy it as a kit with the adaptors.

From where do you source the kit? The cayenne brakes use a radial mount (mounting holes aligned with the axel), so moving the offset to center the caliper on the disc can be tricky whilst maintaining good material thickness of the caliper adapter. I figured this was why most brake conversion using porsche componentary used the GT3/996/997 axial mounted calipers, so you can use a simple block mount adapter, then drill and tap holes to center the caliper on the disc easily.

Pretty wild looking collector there too, now that I can see where the wastegate ports are cut to extract gas from all the header pipes evenly at the colector just before the point of the merge. In theory it should do wonders for maintaining gas flow and decreasing lag between gear shifts, as gas flow is kept even and at maximum velocity right before the turbine.

Getting the wastegate flange section to seal to the collector would be an interesting trick because of thermal expansion it will all change shape a little when its getting hot. Unless it gets tig welded on in step 3.

[UWISSH!]

thats a rather large looking turbo for response in my opinion

what size is it?

[FineLine]

thats a rather large looking turbo for response in my opinion

what size is it?

nothing that a 200 nos shot wont fix.

[BOBBYr34]

From where do you source the kit? The cayenne brakes use a radial mount (mounting holes aligned with the axel), so moving the offset to center the caliper on the disc can be tricky whilst maintaining good material thickness of the caliper adapter. I figured this was why most brake conversion using porsche componentary used the GT3/996/997 axial mounted calipers, so you can use a simple block mount adapter, then drill and tap holes to center the caliper on the disc easily.

Pretty wild looking collector there too, now that I can see where the wastegate ports are cut to extract gas from all the header pipes evenly at the colector just before the point of the merge. In theory it should do wonders for maintaining gas flow and decreasing lag between gear shifts, as gas flow is kept even and at maximum velocity right before the turbine.

Getting the wastegate flange section to seal to the collector would be an interesting trick because of thermal expansion it will all change shape a little when its getting hot. Unless it gets tig welded on in step 3.

If you would like a set of the brakes i can get the kit for you, its very cheap at the moment as the AUD dollar is high. No mods required straight bolt on.

[BOBBYr34]

thats a rather large looking turbo for response in my opinion

what size is it?

The turbo is a turbonetics T70 series with a T76 compressor wheel inside it to achieve a higher pressure ratio. The turbine housing, i have two one is a 0.58 and the one i think i will use is a 0.78 both will have quick spool up and response.

[UWISSH!]

I thort there would of been a t04z or sumthing like that. With maybe .86 housing, that's not realy the turbo I would have chose for the power/ response goal

[BOBBYr34]

You are right about the TO4Z however the brains behind the build John Skola will only use a turbo that has a compressor Map, all your Jap turbo's dont have compressor maps and i think he did look at the garrett TO4Z and was not happy with the pressure ratio. The motor is a stroker and has static compression of 10.1:1, i think this will help eliminate turbo lag and manifold design