How Safe Is 1.0 Bar

[BNR]

hey

ive seen in magazines that on the r32 GTR you can take out some kind of marbel in one of the boost pipes and its ment to rise the boost to 1.0 bar.

how safe is this to do if the rest of your car is just stock with a cat back exhaust ?

im thinking of doing it because its free ! but i dont know if it will damage the motor in any way

whats everyone think ?

[Tommyk]

you shouldnt damage the motor by taking it out.

I have done mine, and it is fine. It is definitely MUCH quicker.

1 bar is about the limit on stock turbos if you want them to last

[always_me]

ive got stock internals and been running 1.3 bar every day, and 1.8 bar when i decide to run big boost, never had a problem

[lwells]

Bit of misinformation in this thread IMHO.

There is a boost restrictor in one of the vacuum hoses. Yes, you can remove it and its unlikely to damage your engine. However, you may well manage to destroy a turbo or two given they have ceramic exhaust wheels and are probably getting on for 15-years old.

Plus you can be unlucky and have bits of the exhaust wheel sucked back in to the engine which will then probably need a complete rebuild.

Lucien.

[Tommyk]

Lucien, the turbos should be fine at up to 1 bar.

This isnt like the gts-t's - they dont get as hot as the one single turbo, because there are two of them.

[itbmils]

OK

I did mine too - and yes it was MUCH quicker and it was very easy to do (only took 2 mins)

BUT

I only did it once I had resigned myself to a full rebuild anyway - and my motor only lasted 6 months after doing it. My motor was already shagged tho - and may not have lasted too long anyway. Turbos were fine however. I don't know about 1.8 bar (26psi) however on std turbos – I would not even push my N1s that hard – I would have thought 1.3 (18psi) was already too high.

The REAL problem is - at std boost even a GTR can feel a bit on the sluggish side – IMHO

Full rebuild is now complete – car running MUCH better with 300awkw

hope this helps

[lwells]

Lucien, the turbos should be fine at up to 1 bar.

This isnt like the gts-t's - they dont get as hot as the one single turbo, because there are two of them.

They should be fine but he also should be made aware of all the consequences if one of his turbos is getting a bit tired. 10-15 years of thousands and thousands of RPM takes its toll.

Lucien.

[[[d a n n y]]]

u wont quite get 1 bar boost

with just catback

mayebe a pods system and front pipes will give u 1 bar

depends how much air can the turbos flow

[ferni]

I've been running around 1-1.1bar on my stock 33GTR turbos for 18months or so, it came like that from the previous owner, so who knows how long before that he was running it.

By just removing the restricter you won't get 1 bar, a little under, and if you dont have a full exaust then a little less once again. I'd remove it if i were you. But everything lwells said is right - the turbos could be tired and they could let go, this will just speed up the process of them letting go... If you don't remove the restricter they may last 12 months, if you do remove it they may only last 6months etc... its up to you. The biggest thing to worry about is if they do let go, the exaust wheels getting sucked back into the engine and damaging pistons.... so if you hear a bang, keep your foot to the floor so the exaust wheel gets blown out the exaust

[pnblight]

be so carefull with std r32 turbos as there are a time bomb and tho the hp you make will not damage the motor if the ceramic wheel let go under full noise you could very well be needing a full motor rebuild as they tend to through bit of ceramic back into the engine damaging valve and rings etc etc I AM NOT JOKING HERE replace the std turbos ASAP i would put this upgrade before all overs.

ps i have seen three motor damaged like this in the last 18-20 months

[wrxhoon]

be so carefull with std r32 turbos as there are a time bomb and tho the hp you make will not damage the motor if the ceramic wheel let go under full noise you could very well be needing a full motor rebuild as they tend to through bit of ceramic back into the engine damaging valve and rings etc etc I AM NOT JOKING HERE replace the std turbos ASAP i would put this upgrade before all overs.

ps i have seen three motor damaged like this in the last 18-20 months

I totaly agree with that statement , i have seen several stuffed engines when one of the turbos lets go .

[benl1981]

Is this the same with r33 RB25DET turbo? Can you cause engine damage if a wheel lets go? Or very unlikely?

[psybic]

My turbos let go. Running standard boost. Just old.

Exhaust wheel off one came off completley, went and said G'Day to the cat. like it down there... stayed. The other was just damaged since the day I bought it, I think it went down there too. Must be unlucky if they get sucked BACK into an engine, I thought the exhaust gas would typically blow it out.

[pnblight]

My turbos let go. Running standard boost. Just old.

Exhaust wheel off one came off completley, went and said G'Day to the cat. like it down there... stayed. The other was just damaged since the day I bought it, I think it went down there too. Must be unlucky if they get sucked BACK into an engine, I thought the exhaust gas would typically blow it out.

The ones i have seen damage motors seem to happen up high load (high rpm spool)and the wheel more explodes into tiny pieces and ceramic dust, and if you stop and think how much velocity would this ceramic pieces have coming off the wheel doing how many thousand rpm? And i at first didnt think it would but seen to many know to dont it. The pieces damage valves and rings and even bounce around in between the piston and head for a bit, not pretty.Plus the ceramic dust is so abrasive.

I'm just glad mine let go at about 2000rpm on cold motor idling of from the stop lights in the morning on the way to work (tho i didnt think myself lucky at the time tho) found the wheel mostly intact in the exhaust.

[BNR]

From reading this it doesnt sound to safe to up the boost on standard R32 turbos so im not sure if i will do it as i dont want to damage anything. The cars got about 85,000 on it at the moment so im not sure if that effects anything.

I was reading speed and they said its safe to do so im not sure. The only thing they were conserned about was the motor running to lean.

[djr81]

From reading this it doesnt sound to safe to up the boost on standard R32 turbos so im not sure if i will do it as i dont want to damage anything. The cars got about 85,000 on it at the moment so im not sure if that effects anything.

I was reading speed and they said its safe to do so im not sure. The only thing they were conserned about was the motor running to lean.

If you hook out the restrictor buy yourself a cheap (<$100) mechanical bleed valve and you can then set the boost at whatever level you like.

14lb or less is fine for a GT-R. The real reason the restrictor is in the line is to get the car under the 280PS limitation in Japan. Why else do you think they make it so easy? Mine has been running on just over 13lb for a couple of years & is fine.

The stock ECU's run seriously fat on fuel - you won't lean the motor out.

As an aside - don't place too much faith in the boys from Speed magazine. IMHO, their understanding is fairly shallow.

[ferni]

yeah just removing the restricter should be fine, its only when boosting the turbos higher than that you get into trouble.

[lwells]

yeah just removing the restricter should be fine, its only when boosting the turbos higher than that you get into trouble.

Don't forget that intake and exhaust modifications will mean more boost (without a controller)

Lucien.

[1989GTR]

Ive got the standard dump pipes on mine but a 3.5 cat back so i probably wont get heaps of flow. Has anyone got some pics of how to do this ? (take the restrictor out)

[ferni]

i have exaust and front pipes, stock airbox with panel filter, and i still have to bleed air out of the vacuum to get my 1.1bar.