Aiming For 450rwkw R34 Rb25det Neo, Idea On Parts Please!

[xntrq]

It's time for me to build my little beasty.

Looking to hit 400rwkw, ideally 450 on pump 98. E85 is out of the question due to availability.

Just want to get an idea on the setups that people are running who's achieved that mark.

At the moment I've got the following laying around:

Garrett GT3540

High mount manifold

1000cc injectors

Aria standard replacement forged pistons and conrods

HKS 3" SilentPower exhaust

Blitz return flow intercooler

Nismo lightweight flywheel

Contemplating:

Haltech ECU

Forward Facing Plenum (don't really want to cut holes into my chassis)

Single Piece tail shaft

[Dose Pipe Sutututu]

exhaust too small, unless you go external & screamer

you'll need WMI with that turbo, I doubt you'll get anywhere near 400kW on 98

FMIC would be a restriction too, IAT will also shoot through the roof

[Hattori Hanzo 69]

GTX42

[GTSBoy]

I agree with Johnny. Less so with Damo, although he does have a point about a bigger turbo being wise. It's going to be a lag monster anyway, so why not enjoy the lag.

External WG is almost essential. Look at the difference between the same turbo with and without external gate in the Hypergear thread (you might have to go back a few pages).

Then you're into the realms of making sure that you do head bolts, probably make sure the rod bolts are healthy, get the right bearing clearances, make sure the oil supply system is up to scratch, make sure the blowby catching system is well done, restrictors, etc etc.

If it were me, aiming for ~400rwkW, I would ignore that fact that people frequently get up there without porting, and make sure that the head was well developed. It makes it possible to make so much more power or use less boost, and that might be the difference between unworkably high exhaust manifold pressures and temperatures or not, assuming you stick with the GT35.

[sky30]

Rb30/25 or rb25?

I made just over 400kw with the gt35, that was rb30 tho

[xntrq]

Forgot to mention, external waste gate is on the list. Contemplating on changing the exhaust to a 4" and plumbing the gate back into the exhaust for simply for emissions and defect purposes.

The Blitz FMIC does seem a little small and would most definitely bottleneck the flow. Perhaps I'll just go FFP.

[Dose Pipe Sutututu]

I would go 4" inch exhaust and plumb back the external if you're trying to go for the semi legal route.

Also none of the off the shelf intercooler kits will cut it. I would be going for at least a 100mm China intercooler or if money permits a 100mm Plazmaman Pro Series intercooler which are assembled in house at their factory. Your IAT will shoot through the roof with those off the shelf kits.

If E85 is out of the question, go for WMI. To get 400kW on A small turbo, especially on A 2.5L with 98 would be very hard to achieve.

[xntrq]

I would go 4" inch exhaust and plumb back the external if you're trying to go for the semi legal route.

Also none of the off the shelf intercooler kits will cut it. I would be going for at least a 100mm China intercooler or if money permits a 100mm Plazmaman Pro Series intercooler which are assembled in house at their factory. Your IAT will shoot through the roof with those off the shelf kits.

If E85 is out of the question, go for WMI. To get 400kW on A small turbo, especially on A 2.5L with 98 would be very hard to achieve.

Did some quick research on WMI and happy to go that way.

Do you know if its OK to run the car equipped with WMI but on a empty WMI tank? Don't really know how to word it but say for example the WMI runs out, 98 will be 100% going through the injectors.

Planning to use the car as a high performance weekender for long trips and things like that, where most likely methanol isn't readily available. Don't want to run around finding methanol.

[34GeeTeeTee]

Buy the HTA3076 that is for sale somewhere on here, run 350rwkw with plenty of response and enjoy the car.... It will fry street tyres no matter what....

Dont make the mistake of getting caught up in a target HP range, dont sacrifice spool for wank factor figures either.... I dont regret making the choice and its been a proven performer!

400-450kw isnt much use on the street in a RWD 34....

[Dose Pipe Sutututu]

Did some quick research on WMI and happy to go that way.

Do you know if its OK to run the car equipped with WMI but on a empty WMI tank? Don't really know how to word it but say for example the WMI runs out, 98 will be 100% going through the injectors.

Planning to use the car as a high performance weekender for long trips and things like that, where most likely methanol isn't readily available. Don't want to run around finding methanol.

Easily controlled by a decent ECU, if WMI runs out lower boost & drop timing.. when WMI is available increase boost & increase timing.

Another work around is have your WMI cut off connected to your boost controller's valve OR power, so when there's no WMI available just run gate pressure and with your ECU's timing map only have strong timing at high boost areas when WMI is activated and sedate timing in low boost areas when there's no WMI.

I still reckon a flex tune is the way to go, I'm running E85 with a flex tune. It's great drove to the track with E85, raced it, drove home on E40.

Less shit to fail than WMI.

Even Nistune supports flex now, and it does it quite well.

[sky30]

I run aquamist wmi. Awsome system with good fail safes built in, if one triggers it changes boost and timing map in my ecu.

I have a 7litre tank for the wm mix and it lasts several tanks of fuel before it even gets close to empty. So no need to worry unless u plan a road trip around australia

[xntrq]

Thinking of the AEM WMI kit.

Though will have a chat to either Powertune or JEM about if its worth going down that way and fail safe options.

Other than that, I gather:

Fat FMIC

Fat Turbo

Fat Exhaust

Fat ECU

Fat Fuel system

Guess I'll put together my setup and see what I get and go from thereon.

[hyper-gear]

If this is my own car and Assume that you have't bought any parts yet.

Get 8.5:1 CP pistons and cosmetic MLS head gasket, that allows you to run extra bit of boost and timing working with pump fuel.

Steam pipe high mount manifold with a big 50mm external gate

1000cc ID injectors

Walbro 470L/H pump (remember to rewire)

3540 turbo is laggy turbo a RB25det, But working with P98 fuel, it must have a large exhaust end. I will be recommending our VNT SS Alpha - 4, Which probably get you there with 25psi full boost by 4100RPM

No return flow intercoolers, it will get you no where and add extra lag from unnecessary length pipping. Use PWR or a Plazamaman cooler kit, or JJR's cheap cooler piping with a 600x300x100mm cooler will do.

I would be using Adaptronic or Haltech plug in ecu.

Edited June 3, 2015 by hyper-gear

[Blackkers]

VNT turbo would be awesome

[xntrq]

If this is my own car and Assume that you have't bought any parts yet.

Get 8.5:1 CP pistons and cosmetic MLS head gasket, that allows you to run extra bit of boost and timing working with pump fuel.

Steam pipe high mount manifold with a big 50mm external gate

1000cc ID injectors

Walbro 470L/H pump (remember to rewire)

3540 turbo is laggy turbo a RB25det, But working with P98 fuel, it must have a large exhaust end. I will be recommending our VNT SS Alpha - 4, Which probably get you there with 25psi full boost by 4100RPM

No return flow intercoolers, it will get you no where and add extra lag from unnecessary length pipping. Use PWR or a Plazamaman cooler kit, or JJR's cheap cooler piping with a 600x300x100mm cooler will do.

I would be using Adaptronic or Haltech plug in ecu.

8.5:1 forged pistons - Check

1000CC ID - Check

MLS Head Gasket - Check

50mm External Gate

Walbro 470L/H pump

100mm FMIC

FFP

Steam Pipe Top Mount

Haltech ECU

VNT SS Alpha - 4

So this setup will roughly meet my target? Do you have a link on your website to the turbo or what is it equivalent to?

[Dose Pipe Sutututu]

go E85 and a flex setup man... Haltech or Adaptronic ECU will be tits.

[hypergear]

Link is below:

http://www.hypergearturbos.com/index.php?route=product/product&path=72_76&product_id=67

The results are based on E85 fuel, take 40kws for pump fuel result.