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Gtst Bigger Plenum, Are They Worth It?

Kujotk

By Kujotk,
in Engines & Forced Induction

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Kujotk Grand Master

Kujotk

Posted
Posted

As the title says...

Looking to buy another R33 gtst (this time as a kickaround/track/drift and posibly as a daily driver) found one that looks good but it has one of those hideous oversized plenums installed already.

Done some internet research and there are very mixed attitudes towards them. Some people say it increases high end range, others say it does that but reduces low-medium power range.... then the companies producing/selling the parts claim up around 25-40hp gains just by installing them.

Anyone got any actual advice first hand or second hand info?

Car in question is failry stock, just usual bolt ons.

Thanks

89CAL Grand Master

89CAL

Posted
Posted

What manifold it actually is will really determine if its any good. Plazmaman which uses stock runners is a good manifold and I suppose you could call hideously oversize?

The Greddy knock offs are the main ones kicking around (I have one, as you can see in my sig/profile pic)

I don't think it made an awful lot of difference (good or bad) but it neatens up the engine bay an awful lot. I wouldnt turn down a car JUST because it has one, Especially a Plazmaman.

Torques Mentor

Torques

Posted
Posted (edited)

It seems to be keeping the lower stock intake runners and from the design I would expect less low down torque but possible added high/mid to top end power.

Long runners increase low rpm velocity (torque) but might hinder flow somewhat when you're up the rev band.

Is the turbo upgraded?

Edited by Torques
Kujotk Grand Master

Kujotk

Posted
  • Author
Posted

Nope stock turbo but might be running more than stock boost??? Haven't inspected it yet.

Seems to just be exhaust, pod, FMIC and a boost controller

jjman Mentor

jjman

Posted
Posted

It would be a strange 'modification process' to do the intake plenum first before turbo or other mods. But then again iv seen stranger processes taken with skylines.

It could also be a car that was de-modified before sale and it was just going to be too hard to remove the plazmaman plenum, hence why it is still there...

Kujotk Grand Master

Kujotk

Posted
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Posted

Took it for a test drive on Sunday, had no balls though, no idea why but it wasn't that quick. i'm comparing it to my old r33 that had similar mods (minus the 19inch wheeels and plenum), and I was hitting 195rwkw, this one with similar mods seemed around 160rwkw.

Got to start the car from a cold start, owner said sometimes it smokes for a few seconds (didn't do it when I saw it), Owner also said at 10psi boost it sometimes missfires, (again didn't happen when i drove it).

Not sure what to make of it,

Test drove another one today, all 4 corners had rooted suspension, car was rough as guts, missfired all over the place, couldn't break traction... starting to think they are all crap now... should have kept my old one :(

Kujotk Grand Master

Kujotk

Posted
  • Author
Posted

yes has stock ecu, but so did my old one... had a nice crisp rebuilt gearbox though, never felt a gtst's box so tight before.

89CAL Grand Master

89CAL

Posted
Posted

My car made 140rwkw with intercooler, exhaust, more boost, splitfires, fuel pump and pod filter. They are all different, I'm not sure why some ECU's are more protective then other, but just saying a tune will help a great deal

FYI, after a tune and putting my Greddy copy manifold on (Only other additional mods to above was 3" cooler pipes) the car made 195rwkw pretty easily

89CAL Grand Master

89CAL

Posted
Posted

thats how i bought it....Engine .used to cut out occasionally, not exactly sure why but probably had something to do with it

So confused.... was it a bleed tap with a bunnings sticker on it or a home made job or am I missing something :P

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