Upgrading Turbo

[croat]

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.

[Sass]

thats beyond the stock internals limit

have u got a built engine?

[ECR033]

320rwkw shouldn't be difficult to achieve with the HKS3040R or Garrett equivalent provided you do have a built engine. I think there are a few people on here who can personally vouch for that...

I've got a GT3040R on my R33 making around 280rwkw on 17psi (see dyno graph below). I've only got a std bottom end, so I haven't really pushed the limits of the turbo too much at this stage, but there's definately potential to make a lot more power.

Obviously it's not going to be as responsive as your current set up, but full boost by just over 4000rpm isn't too bad when you making approx 300rwkw.

Hope that helps

[croat]

yeah i have stock internals. i will just keep power capped until they are upgraded..

[croat]

whats the ps rating of the 3040R?

[Busky2k]

The HKS 3040 is rated at 500ps @ flywheel and is externally gated.

[eddieneedsboost]

sorry for being a dumbass , i know that means 500hp but wat does "ps" mean?

[Busky2k]

1.0 Japanese PS = 0.98632 BHP

[ECR033]

The Garrett GT3040R is rated is 600hp.

SEE HERE

I also forgot to mention that i have the 0.82a/r turbine housing, so I guess you could go for the 0.63a/r if you wanted less lag, although power would come on like a light switch which would make traction a bit of a problem. The 0.82 is nice and progressive.

[Abo Bob]

Wouldn't the 0.63 choke the top end too much and stop you from getting to 320?

What about the GT2835 Pro S with the 0.87 rear housing? That should get you there.

What was B-Man running when he had 330rwkw? Was that the 2835 or the 3040?

[ECR033]

  Abo Bob said:

Wouldn't the 0.63 choke the top end too much and stop you from getting to 320?

<{POST_SNAPBACK}>

I used to think that 300+ would be pushing it with the 0.63, but after seeing Wilchs results in the rb25 dyno thread - i.e mid 270's @ 16-17psi with a .63 GT30R on rb25 w/std internals (I think?) - I guess 300 could be possible with a little more boost and a rebuilt engine.

  Abo Bob said:

What was B-Man running when he had 330rwkw? Was that the 2835 or the 3040?

<{POST_SNAPBACK}>

I think it was a HKS3040R from what I remember when I was researching a while ago (may be wrong)

[croat]

yeah i think he was running a HKS3040 from memory. I would expect more power than that though from the HKS3040. would think around 350rwkw??

[Abo Bob]

That had a lot of stuff done to it to get that.

An R33 RB25 head isn't the most amazing piece of gear and it's still only 2.5 litres. Imagine how peaky 300-350rwkw would be. Sounds ilke a waste of time if you ask me.

[Beer Baron]

  Busky2k said:

1.0 Japanese PS = 0.98632 BHP

<{POST_SNAPBACK}>

actually PS is not a japanese measurement. i dunno where you got that from but it's the (old) german standard of horsepower. it stands for Pferdestärke which i am quite positive is not japanese. basically means horse power in german.

[R31Nismoid]

  Abo Bob said:

That had a lot of stuff done to it to get that.

An R33 RB25 head isn't the most amazing piece of gear and it's still only 2.5 litres.  Imagine how peaky 300-350rwkw would be.  Sounds ilke a waste of time if you ask me.

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

[Josh]

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

[nugget400hp]

GT35/40r 700hp

[Wazz]

when your ready to sell your gtrs let me know please

[nugget400hp]

.....

Edited February 13, 2006 by nugget400hp

[ECR033]

Turbo's aside...

Have you considered using an RB30 bottom end?

If I ever had to rebuild my engine, I'd seriously contemplate going that way as the RB30 bottom end should definately give a much broader power band than the RB25. Add in a GT30 or GT35 turbo (with the usual supporting mods) and 320rwkw should be a formality. The bonus being that the power is usuable over a large part of the rev range as opposed to having peak power at the top of the rev range and not much else for the rest of it if you had the same power with the RB25.