Quick Question About Boost.

[daslingdale]

Fitting an exhaust myself today. It's a full turbo back system.

Just wondering how much boost will I be running? And is it safe? Everything else is stock.

I don't have a boost controller yet and I don't want to risk decimating my turbo.

I didn't think it would be an issue since R33's only run 7psi standard and I couldn't imagine it leaping high enough to cause damage. But best to be safe.

I tried searching but this is urgent.

Cheers

[kwl33]

The boost will be the same as before the exhaust, it might get thee a bit quicker though, max boost without damage on stock engine is about 12 psi (with intercooler) Mine is set at 11

[3LGODZILA]

have u got a boost gauge? your right they run 7psi stock (this is after 4500rpm, before that its 5psi) but they tend to run up to 9psi after upgrading the exhaust and cooler, this is normal & safe

[Adriano]

It will run about 10-11 psi, the boost always goes up with these when you fit a turbo back exhaust.

[mad082]

technically speaking the boost shouldn't actually rise at all. this is because the boost is controlled by the wastegate and it will still open at the same pressure. i never saw a boost increase from full exhaust and cooler. however other people have.

[daslingdale]

I just have the standard boost gauge in the dash. So I have no idea.

But thanks for the information everyone... It helped massive.

My mate fitted it all today after eight bloody hours. Got him to do it as he is in the trade and knows more about the right way to undo and tighten bolts. Took so long as there was a few brick walls to jump when fitting.

Not a fan of the system. Way too loud... It drones under load so much it hurts and it does not sound like a RB anymore if that makes sense.

Hopefully it is worth the performance after I give it a bit when it wears in properly.

[mad082]

what sort of exhaust did you get for it to be super loud? i had a 3" off the turbo to cat then 3.5" from cat back and it wasn't very loud at all.

does it still have the centre muffler in it?

as for it taking 8 hours, wow. i'm guessing a broken bolt/stud on the turbo, because otherwise it is a very straight foward job and shouldn't take more than about half an hour.

[daslingdale]

what sort of exhaust did you get for it to be super loud? i had a 3" off the turbo to cat then 3.5" from cat back and it wasn't very loud at all.

does it still have the centre muffler in it?

as for it taking 8 hours, wow. i'm guessing a broken bolt/stud on the turbo, because otherwise it is a very straight foward job and shouldn't take more than about half an hour.

It was the full JJR system with the Xforce Cat. It is the loudest I would go for an exhaust in this car but the only problem is that it drones under load. Can hurt the ears. There is no centre muffler with this system.

It took so long because one of the bolts to the turbo was pretty hard to get to. We didn't have the right tools to reach it and the bolts thread was slightly stripped. And the who ever welded the cat was the worst welder. They left a blob right where the sensor goes so we had to drill it out to get it to fit.

If it all went smooth then it would have taken half the time. Oh and we got Macca's so that took up time haha.

I will give my final thoughts on the system once it wears in a bit. For the price it's still a great buy regardless. Just wish it sounded a bit more smoother.

[mad082]

it is probably due to the rear muffler they use. the body of the cannon probably isn't quite big enough to allow enough packing between the baffle and the outer body to take enough noise out of it. also being stainless probably makes it a bit louder. if you still don't like it in a week or 2 just go to an exhaust shop and get a better muffer put on, like a large 3" oval muffler such as a lukey ultra flow. that will make it a fair bit quieter.

[bubba]

technically speaking the boost shouldn't actually rise at all. this is because the boost is controlled by the wastegate and it will still open at the same pressure. i never saw a boost increase from full exhaust and cooler. however other people have.

+1

[daslingdale]

it is probably due to the rear muffler they use. the body of the cannon probably isn't quite big enough to allow enough packing between the baffle and the outer body to take enough noise out of it. also being stainless probably makes it a bit louder. if you still don't like it in a week or 2 just go to an exhaust shop and get a better muffer put on, like a large 3" oval muffler such as a lukey ultra flow. that will make it a fair bit quieter.

Yeah that sounds like a good idea. But I might start catching the train to work so this will be my weekend car soon enough. I will be more reluctant to put up with it.

You are right about the stainless part. Never been a fan of stainless compared to mild steel as far as sound goes.

[adamskill]

It was the full JJR system with the Xforce Cat. It is the loudest I would go for an exhaust in this car but the only problem is that it drones under load. Can hurt the ears. There is no centre muffler with this system.

It took so long because one of the bolts to the turbo was pretty hard to get to. We didn't have the right tools to reach it and the bolts thread was slightly stripped. And the who ever welded the cat was the worst welder. They left a blob right where the sensor goes so we had to drill it out to get it to fit.

If it all went smooth then it would have taken half the time. Oh and we got Macca's so that took up time haha.

I will give my final thoughts on the system once it wears in a bit. For the price it's still a great buy regardless. Just wish it sounded a bit more smoother.

there is a huge difference between stock and aftermarket exhausts mate, dont worry you will get used to the noise and learn to love it!

[daslingdale]

The exhaust has worn in and it sounds grouse. Recommended!

[Get EPIC]

Yeh had the same system and im not sure whether it wore in or i got slightly deaf.Either way sounded awesome on boost.Actually have it from catback still in the garage if anyone is interested.Its also had a hotdog resonator welded in but the resonator is in mild steel.