Upgrading Turbo

[Sydneykid]

currently been thinking about upgrading my HKS GT-RS turbo on my R33 GTST. im after the 320 rwkw make but dont want a laggy ass turbo. Currently making 260rwkw and bored of it.

What turbo's have you people seen make 320rwkw without too much lag (preferably HKS turbos). considering the HKS 3040 but not too sure on how it goes.

any help/dyno graphs will be appreciated.

<{POST_SNAPBACK}>

I am wary of RB25’s with more than 300 rwkw,

been there

done that

didn’t enjoy it

at all.

The recently departed R34GTT had 265 rwkw using a GCG ball bearing high flow on the standard manifold. The usual stuff, R33GTR intercooler, alloy intercooler pipework, Power FC with boost control kit, Tomei Poncams, Pipercross filter in the standard airbox, Z32 AFM, full suspension kit, Michelins for the street, Yokohamas for the track and MT’s for the drags. It was nice, drive it everyday, city traffic, drag strip or circuit rain, hail or shine (well maybe not hail). It did an 11.9 at 120 mph in that trim, very reliable, gave us no grief whatsoever, I could always count on it to beat anything I came up against around town.

I was pushed into upgrading to a GT30 on a high rise HKS manifold, external wastegate, POD etc. It made 315 rwkw after much stuffing around, bits didn’t fit, cracked, bolts/nuts came loose, couldn’t drive it for weeks at a time etc. After many, many attempts finally got it to an 11.7 at 128 mph. It was a bitch to launch, too much wheelspin or bog down, lost boost on gear changes. It was crap in traffic, couldn’t drive it fast on the street, too peaky, lag, lag then wheelspin, lost many drags up to the speed limit and it the wet it was not at all pleasant. After a few months I decided this wasn’t for me.

So I put the standard manifold and high flow back on, sold the GT30 and bits, reloaded the 265 rwkw maps and since then I have driven it around most days. Much nicer car to live with and, I reckon, ultimately faster on the street. Now my big power engines are 3.1 litres and the project R33GTST, with its 2.5 litre, won’t be going over 270 rwkw.

I hope that has been of some use.

Cheers

[Beer Baron]

I thought it was horse strength... which would basically mean horse power anyway..

<{POST_SNAPBACK}>

haha. and i thought i was pedantic! Yeah litereally translates to horse strength, but in practice it means horse power. but i stand corrected

[Busky2k]

The recently departed R34GTT had 265 rwkw using a GCG ball bearing high flow.... It did an 11.9 at 120 mph in that trim:) Cheers

<{POST_SNAPBACK}>

Thats a very nice TS for 265rwkw!! I thought we needed closer to 300rwkw to get that kinda TS in an a Skyline?

[croat]

Thanks for the input SK. i guess ill just stick with the HKS GT-RS. i am considering mounting the turbo up a little more and makeing it externally gated so it holds boost better as the internal gate gives me the shits.

i know the power increase will be minimal but does it saound like an okay idea?

[Cubes]

Thats a very nice TS for 265rwkw!! I thought we needed closer to 300rwkw to get that kinda TS in an a Skyline?

<{POST_SNAPBACK}>

Depends on how happy the dyno is.

[discopotato03]

Food for thought .

[Roy]

Food for thought .

<{POST_SNAPBACK}>

.... Im not much of a camper or hiker, but the topography of that hill looks like its a bigclimb.

..Im with disco, get out and enjoy the outdoors on the weekend, cheaper then chasing 320rwkws

[Guest Mashrock]

.... Im not much of a camper or hiker, but the topography of that hill looks like its a bigclimb.    

..Im with disco, get out and enjoy the outdoors on the weekend, cheaper then chasing 320rwkws

<{POST_SNAPBACK}>

hahaha

[nsta]

Hey very good read Sydneykid:0, so it'd be better to go around 270ish rwkw with a more responsive turbo, than to go big turb more lag and 300+ rwkw?would you have went back to 300+ if you had a rb30 bottom end, cause im aiming for a 260-270rwkw car for daily driving.

[nfi]

Thanks for the input SK. i guess ill just stick with the HKS GT-RS. i am considering mounting the turbo up a little more and makeing it externally gated so it holds boost better as the internal gate gives me the shits.

i know the power increase will be minimal but does it saound like an okay idea?

<{POST_SNAPBACK}>

Hi Croat,

I would not high mount any turbo if I could avoid it. Granted that the boost control may be more accurate with an external gate but the heat problems and hassles you get with high mounting turbos in my opinion is just not worth it.

Once high mounted people commonly have problems with the abs unit over heating (if you have one) and everything else overheating because the heat is stuck under the bonnet let the hassles you will have if a cop sees your turbo high mounted.

Instead of high mounting I would be tempted to get a really good dual solenoid boost controller and a split dump pipe if you don't already have them both.

Just my thoughts. Good luck and I hope it helps a little.

Edited February 15, 2006 by nfi

[Kristov]

I'd agree. Much over 300rwkw and its gonna be peaky.

My setup (in my opinion) with the 600hp GT30 was as late as i would want a turbo to come on (4200/4500rpm/17psi)

With a redline of high 7000's thats not the "greatest"

Hence why im RB26, aiming for 330rwkw but rather than 4500rpm, it'll be more like 3500rpm, with a MUCH broader span of power, with 240rwkw in before 3000rpm (where rb25 was more like 150rwkw) based on results of other cars with a setup similar to me

<{POST_SNAPBACK}>

Excuse my ignorance but why is the rb26 abe to produce so much more power down low compared to the rb25. Obviously it has the extra 100ml capacity but is that enough to get such a large increase in power in the low rev range? Cheers

[Roy]

LOL...simple reason it is doesnt. Only with the head and valvetrain it has it can pull 8,300rpm a bit easier then the RB25

[markimak]

500 ponies.. we all agree

[bigcarl]

go the gt3040 600hp turbo with a/r .82 exhaust housing, 300 plus rwkws , go on you know you want too!

[discopotato03]

Yep you want it to be laggy , GT3040 that'll do it ...