R34/vg30 Turbine Exhaust Cover - On Gcg High Flow

[Sydneykid]

So SK. Assuming you had a regular 2.5L normal cams etc would you recommend the vg30 housing in order to get ~ 250rwkw.

Should the response still be ok? Putting your invested interest aside hahaha

What I'm wondering is if is worth downgrading to the R33 cover to increase response and still have close to 250rwkw. It's about 4-6 hours work taking the turbo off and on again though.

Nope, the high flowed RB25DET turbine housing will do 250 rwkw, givne decent tuning.

Personally I wouldn't use a VG30 turbine cover until I was aiming for 275 rwkw or more.

Why have the poorer throttle response when you don't have to?

Cheers

Gary

[benl1981]

Just swapped back to the smaller cover.

Quite a large improvement in boost response. Admittedly the comparison was on the untuned map for both turbos (so the difference may be reduced with a proper tune).

Its strange the r34 runs the larger cover. The r34 must spool a little later than the r33 (I guess stock they have the smaller lighter wheels so less noticeable)..

Much happier with it now though. I should have probably kept the vg30 cover in case I ever go 3L bottom end though

Edited January 17, 2008 by benl1981

[MANWHORE]

Hi Ben

How much difference would you say it made in your opinion in terms of rpm and actual feel.

I believe that it makes a lot of difference in terms of feel.

[Simon-S14]

tune it already!

[benl1981]

Chris. It really transforms the car. I didn't enjoy driving it that much with the vg30 housing. Now it is just always there ready to start going.

Slightly laggier than stock turbo but not much.

Peak Boost probably made 300-500rpm lower but it is the ease with which it builds the boost that is important. You really had to sink your foot into it with the vg30 housing, now you can get 6psi+ without hardly any throttle input.

Unless your willing to spend money on cams, or cam gears or 3L etc I wouldn't recommend the vg30 cover. Will be a lot of tuning to get it close to the r33 housing response.

My car is 99% street driven so it is important to have the low end. It's never going to be a v8 but anywhere over 3000rpm is great now..

Edited January 19, 2008 by benl1981