A Little Bemused About Where To Go From Here...

[Marco-R34GTT]

Cheers for the input lads!

Still, not too sure which way to go in terms of turbos.. What are you running bubba?? Single? Twins? That is really the major factor, what to bolt up to a 15/18 or 15/30 setup...

Whoa I just noticed this MAJOR typo..

I meant 25/28 or 25/30... My bad...

[bubba]

Marco, I wrote up an epic reply the other day then teh intrawebz shit themselves and I lost it

[bubba]

That's the problem, rebuilding an engine is never quick, be nice to have a running car and build up a spare engine instead

Building an engine is the fast part, custom turbo setups aren't. We did my original 30 conversion in a weekend, drive in - drive out.

Like a mate of mine. Owns a GTI-R pulsar with a spare motor sitting on an engine hoist in his garage, he cbf working on it anymore so when he'd finished paying it all off etc, he bought a 310rwkw S15..... damn. Think we'd all love to have something else sitting around just in case. As for me, it's the wifes Echo ... lolz.

That's why I have the Stag

Cheers for the input lads!

Still, not too sure which way to go in terms of turbos.. What are you running bubba?? Single? Twins? That is really the major factor, what to bolt up to a 15/18 or 15/30 setup...

GT35R (0.82 exh) on a 6boost manifold with a 50mm Turbosmart Progate.

Id consider the Plazmaman plenum over the Greddy, simply as I like the design better and theres less copys floating about that you might get stung with. That and it's an australian company.

I'd say a 30 would be alot cheaper (depending on how you build it ) than the Tomei 2.8 kit if you were heading down that path?

Thats really all I have on the topic, other than maybe running a surge tank as well for the fueling system?

30 is definitely cheaper than a Tomei or HKS 2.8 kit.

I would steer away from the Plazmaman plenum for a twincam 30, they are only a replacement top half of the intake manifold (retains stock runners). You're really better off with the GReddy plenum to gain back some bonnet clearance. Matey has one on his 25t/30 and it makes the numbers just fine.

I'm running a custom plenum though due to non-turbo head (same stud pattern as RB20).

The dirty30 would be a very good choice.

properly balanced and an aftermarket balancer ross/ati they will rev to 8k

be considerably cheaper then a stroker kit too

Go with a big single to save alot on buying 2x the turbos,manifolds,etc

Have a read through Cubes thread. He has a low mount rb25/30 making 400hp? on stock manifolds (i think)

however engineering a rb30 and licensing it these days might be more of an issue over a rb25 with a 2.8 stroker

+1 for all that except the licensing.. theoretically, with this new emissions testing, you should be able to get anything registered aslong as it passes the emissions test.

I'm waiting for Spool to release their 3.4 cranks for RB30s, RB34= More of a good thing and still much cheaper than Jap 2.8s.

Strong early power makes for a much nicer and faster drive.

Ditto!! When they get released I'm thinking of building up a 3.4L for the 32 and putting the old forged 30 bottom end into the Stagea

[SKYRYAN]

Hail Marcus,

Do the 3L!

The neo = your driving engine till the 3L is built

Edited August 24, 2009 by SKYRYAN

[Dsturbd]

Heres 2 more options

Just like Pam Anderson you too can have a nice pair

Crazy times are had with this combo 620hp on ult98 , you know your 34 needs it

[Kaido_RR]

Mark, Speaking from experience, anything more than 400rwhp in a RWD car is overkill, yes it's fun, but impossible to get grip. I've spent more money than any sane person would and personally I'd go for a smaller responsive turbo, peak power isn't everything, response and driveability are more important.

lol i happily swap motor setups with ur pauly

+1 with Dsturbd, f**k off the 25 and put a 26 in it, if i could go back i would have done that in the 1st place

Edited August 24, 2009 by Kaido_RR

[bubba]

30.

That is all.

[Marco-R34GTT]

oi bubba, that turbo you're running on the dirty30, is it low of high mount?? As I said earlier, I'd dearly love to keep it low mount, which is why I was looking at an externally gated HKS 3037... What's your opinion on that one?

[GTS-t VSPEC]

External gate is the only way to go IMHO, and high-mounts look good

[bubba]

High mount Marco, was a bit too big and my power goals a bit too high to use stock manifold.

There are smaller turbos that will make the power you want, something like Pauls' turbo (3076?) with a bigger exhaust housing (for the 3L exhaust flow) might fit on stock manifold.

Hiflow is another option..

[Marco-R34GTT]

Not going to retain my manifold. I'll be going aftermarket.. Cost aside, I can't see any merit in retaining my stock unit... From what I've read going aftermarket can improve response anywhere from 200 or 4 or even 5 hundred rpm.. So for what I'm trying it do, is low-mount simply impossible?? I was hoping that I could get an aftermarket low-mount manifold (either off the shelf or made up), and then go for a 3037 and have it externally gated.. It is true that a 3037 is the largest possible turbo than can be low-mounted on a skyline??

[bubba]

Aftermarket low mount manifolds tend to be rather crap due to the space constraints. If you want a quality manifold then 6boost highmount is the way to go.

I also think a 3037 might be a bit small for a 3L.

[monga]

Marco, what's the purpose of the car and what sort of power are you after?. That could provide a more directed response to help achieve your goals.

[bubba]

Street driven, super responsive, 400rwhp I believe is what Marco said at the start of the thread.

[Marco-R34GTT]

Street driven, super responsive, 400rwhp I believe is what Marco said at the start of the thread.

As Bubs said (Although maybe not SUPER responsive, just 'rather' responsive would suffice! ).. Although, I know I'm being vauge, but between 400 and 500.. Preferably closer to 400, but I'm assuming that is rather dependant on which direction I go in terms of turbos... I just don't want a lumpy, undrivable, peaky little b@st@rd... Another thing I said at the start of the thread that it wasn't so much a matter of HOW much power but HOW my engine makes that power.

So in a nut shell, with displacement increase, low-mount is basically out of the question?

Thanks guys, appreciating the feedback very much!

[monga]

Paul would be the man to chat to if you are chasing those kind of figures in the RB25DET, he is the one who has been there and done it and figured out what works ect. Plenty of people love the 35R with supporting mod's and make around that 350-400hp number. Having 500hp tend's to break lot's of shit from my experience but it's great fun.

Edited August 26, 2009 by monga

[bubba]

IMO the 35R is a bit big for 350-400hp.. that's more GT30 territory, I'm hoping to make a shade over 500rwhp with my GT35R and be at least as responsive as Pauls GT30'd setup.

As for low-mount being out of the question, it's not so much the displacement that says that but the power goals.. physically fitting the turbo becomes an issue. Anyway, high mount looks better and it way easier to work on!

Edited August 27, 2009 by bubba