Increasing the boost on a R33 GTS-T

[Della]

I've recently bought a 1997 series 2 R33 which is completely standard apart from the suspension.
What's involved in increasing the boost pressure? I understand the standard pressure is 7 & 9psi (2 stage). Do I need an electronic boost controller or is there a cheaper alternative? I'm wanting to go to 10 & 12psi as I understand the standard turbo is good for up to 15psi without running into problems.

Any advice would be appreciated.

Cheers

[RobCrezz]

Cheapest way is to disconnect the stock boost controller and fit a manual ball and spring controller. You will need a boost gauge for this so you know how much you are boosting after you adjust it.

Best way is to get a EBC like a Apexi AVCR or Greddy Profec B spec II.

[liner33]

The stock tubbie will break above 0.85bar so thats about 12.5psi, the Aussies run them higher but i wouldnt risk it

You will need a bleed valve, boost controller or adjustable actuator to get this but this can cause fuel cut problems , flat spots and highlight problems with the ignition etc

If you earth out the boost solenoid the car will be on high boost all the time and this is a worthwhile mod , plenty of info on how to do this on the club sites

[k15tox]

liner33 said:

The stock tubbie will break above 0.85bar so thats about 12.5psi, the Aussies run them higher but i wouldnt risk it

You will need a bleed valve, boost controller or adjustable actuator to get this but this can cause fuel cut problems , flat spots and highlight problems with the ignition etc

If you earth out the boost solenoid the car will be on high boost all the time and this is a worthwhile mod , plenty of info on how to do this on the club sites

as he said.....stock turbo's are ceramic and made of chocolate, dont boost them above 0.85.

i kept the two stage boost on mine, still pulled like a train.

some people experiance fuel cut and problems when ditching the 2 stage, and going 0.85. the best bet is to get mapped or buy a safc and tune the fueling to suit.

www.skylineowners.com great site, the guys will help you on here

[Della]

Cheers guys.
I think I'll wait until after the Christmas break and get an electronic boost controller and a remap and tune at the same time. I'm picking up a front mount intercooler at the weekend so I'll get that fitted as well.

I was reading about the trick with the solenoid to have the turbo on high boost all the time. Sounds like a pretty safe and easy mod.

Interesting you mention 0.85 bar as a safe upper limit as the general opinion here (Australia) seems to be to run them up to 1 bar.
I plan to get the electronic controller fitted and maintain the 2 stage boost at 10psi and 12psi if I can.
I use the car every day and reliability is very important.

[liner33]

As I said the Aussie's run them higher but i think it probably has a lot to do with the weather ie not the extremes of temperature we can get here

[sparkyhx]

k15tox said:

liner33 said:

The stock tubbie will break above 0.85bar so thats about 12.5psi, the Aussies run them higher but i wouldnt risk it

You will need a bleed valve, boost controller or adjustable actuator to get this but this can cause fuel cut problems , flat spots and highlight problems with the ignition etc

If you earth out the boost solenoid the car will be on high boost all the time and this is a worthwhile mod , plenty of info on how to do this on the club sites

as he said.....stock turbo's are ceramic and made of chocolate, dont boost them above 0.85.

i kept the two stage boost on mine, still pulled like a train.

some people experiance fuel cut and problems when ditching the 2 stage, and going 0.85. the best bet is to get mapped or buy a safc and tune the fueling to suit.

www.skylineowners.com great site, the guys will help you on here

what he said.

[Della]

I've looked on the skyline website and I reckon a cheap way of upping the boost will be by fitting a turbotech or turbosmart single stage manual boost controller.
Will I be ok doing this with a standard exhaust system? I will upgrade the exhaust eventually but for now I'm just looking for a bit more mid range without drawing additional attention to myself.

[liner33]

thats just another name for a bleed valve you would be better off changing the exhaust and certainly decatting and replacing the downpipe the csar will be quicker for sure