Max Safe Boost on R33 25T

[96GTS25Tii]

Hey dudes

What is the max boost I can run safely on my car - R33 GTS25T - It is factory except for a k&n panel filter and 3 inch exhaust ?

Also does anyone know much about the Promuff brand of stainless steel muffler ?


Cheers

[J-Spec Imports]

You can run up to 14psi with the mods you have as long as you remove the factory boost controller (which increases boost at around 4500 rpm) otherwise you should run around 10psi - either way you should get the car dyno tuned to make sure.

[Ethan_R33]

Hey J-spec im sorta in the same boat.
I have an R33gts25t, with HKS: intercooler, exhaust, dump pipe.
and blitz pod filter.
I want to know how to remove the factory boost controller like you said, and then whats a safe boost to run from my new turbosmart boost controller with the mods i have??

Andrew

[GraemeWi]

I run a maximum of 12 with mine (exhaust, filter, TSBoost controller), and it can detonate at that level. I normally sit at 8psi. If I used high boost more often, I'd get the boost dropped to about 10-11.

IMHO 10-11 is safe. I know people who run higher, but they have ECU (and usually injector) upgrades.

[Ethan_R33]

so you think that with optimax (98 octane i think) i should set the max on 11 psi????

[J-Spec Imports]

as I have posted many times before

...12psi is too much IF you still have the factory boost controller also because it will detonate and could cause damage
...with the factory controller removed you can run 13-14psi without detonation but should get it dyno tuned anyway just to know for sure.

...I will help anyone in Melbourne fit a boost controller and even arrange the dyno.

[Ethan_R33]

J-spec,

would you be able to tell me how to remove the factory boost controller??
Is it easy to do??

Andrew

[denjam69]

IS JUST NORMAL UNLEADED OK IF U R RUNNING NORMAL BOOST??

[J-Spec Imports]

Andrew,

removing the factory boost controller and fitting the TurboSmart one is easy to do, but maybe a little hard to explain simply - call me on 0414 502 250 and I will arrange a time to do it for you (at no cost)


denjam69,

These cars run on 100 octane fuel in Japan, so it is best to use Optimax (or other 98 octane fuels) where possible
if you don't have access to 98 octane where you live or just want to run normal unleaded fuel all the time, I would suggest taking the car to a good tuning shop and get it set-up properly for low octane fuel and you should be alright - personally I use nothing other than Optimax.

[denjam69]

THANKS JSPEC! I HAVE BEEN RUNNING ON OPTIMAX BUT ITS COSTING ME ALOT OF $$!

OH WELL MORE OPTIMAX 4 ME THEN!

[Ethan_R33]

hey J-spec,
i Pm'd you before, and said that i live in mildura (top of vic)
So its very hard for me to take time off work and drive down there

But if its possible you could try and explain to me how to remove the factory boost controller that would be great.

Andrew.

ps, is the factory boost controller also called the solonoid? And is it a small trumpet looking thing mounted on the passenger side with a wire and a couple of hoses going to it???

[GraemeWi]

I guess it's our crap kiwi fuel once again.

J-Spec, how can the factory boost controller cause detonation? I'm curious.

[96GTS25Tii]

Hey J-Spec

Thankyou for your information to date.

I would also be extremely grateful if you explained removing the factory boost controller (I live in NZ)

Do you mean removing the hoses that are attached to the goldish boost solenoid and then connecting to the turbosmart controller, and also disconnecting the electrical connection to the boost controller (i.e black clip).

Is this it ? Or is it different, or is there something extra to do ?

Cheers
Ajay

[J-Spec Imports]

yes, the solonoid is what controls the boost

removal is really simple (easier without the airbox in the way)
1..unplug the wires
2..remove both hoses from the solonoid
3..unbolt and remove the solonoid
4..grab the hose that came from the solonoid with the T join (should be still joined to the intake pipe and wastegate actuator)
5..remove the T part and put your TurboSmart unit in there
6..get the other hose from the solonoid (disappears down to the blow-off valve return pipe) and block it off with a screw

I will do a quick tech article for this soon (with photos) - meanwhile call if you need to be talked through any of it..

[GTR-80Y]

J-spec....you got any mates in syd that will do it for free too?? looking to get on in a week or so.