R34 Skyline Boost And Air Filter

[stranger12]

Hi All,

I have a question on air filter on my skyline and max boost I can run .

it is skyline r34 r25det standard . I know reading around people do say do not run the boost more that 0.85 which is around 11psi on the standard engine .

If I purchase a boost controller can I increase the boost to 11 psi and remove the 2 stage solenoid ?

what bhp should I expect ?

if I run it too high, is the worst case, wastegate opens at 1 bar = 14 psi ?

if turbo is abused would that only fail with nothing else going with it ? what are the symptoms of a tired or failed turbo ?

my filter is one of the cheap cone ones as per the picture below.

I want to replace it with K&N , would k&N which retail at £79 in the UK be good enough for up to 450-500bhp which I want to achieve by changin turbo and manifold in future ?

Also I should mention I have received a large front mounted intercooler with my car so will be planning to install it which I think makes the air denser and cooler.

picture of my air filter

[Trex]

connect the pressure source to the waste gate and you will run waste gate pressure which is around 7psi. or use a bleed valve to get more boost.

that's very expensive for a filter, when some of the cheaper ones are just as good.

[stranger12]

many thanks for reply, would they have the same flow ?

also i want to run around 12 psi as 7 is low and feels gutless

Edited April 17, 2015 by stranger12

[GTSBoy]

Pods are crap. Std airbox FTW.

11 psi is about as much as you can run on std ECU tune without the ECU going into a self protect mode called R&R. Maybe 12. 14 psi will eventually see your turbo in pieces. If you have boost, your turbo is currently fine.

Google is your friend.

[stranger12]

thanks , bhp wise what would you get from 12psish ?

[GTSBoy]

<200rwkW

[stranger12]

It is 280 bhp standard at flywheel

Saying there is 50 loss at wheel (20%) that makes 230 theoretically so 200kw is 268 bhp meaning it will be around 310 bhp with decat and remap?

[Trex]

theory is fun

[KiwiRS4T]

Don't worry about the hp - a little more boost will get you a little more power. Decat won't do much without a 3in front pipe. You probably won't find anyone to "remap" your ecu you will be looking for a Nistune chip or similar when you start changing turbos. There is a ton of info on this site - search first. If you can't figure out the search function just google the question - often you will be referred back to this site anyway.

[GTSBoy]

And you can always add "site:sau.com.au" to the google search to force it to only search here.

[stranger12]

thanks All