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Boost Leak From The Rb Motors

satie12

By satie12,
in General Maintenance

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satie12 Newbie

satie12

Posted
Posted

hey guys, i know all the RB motors have the slight boost leak from the back of the rocker covers from the gasket, just wondering how you would get rid of it? could you drop a front mount cooler in and that will eliminate the boost leak?

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https://www.sau.com.au/forums/topic/436079-boost-leak-from-the-rb-motors/
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StevenCJR31 Veteran

StevenCJR31

Posted
Posted

hey guys, i know all the RB motors have the slight boost leak from the back of the rocker covers from the gasket, just wondering how you would get rid of it? could you drop a front mount cooler in and

that will eliminate the boost leak?

Erm. . What?

kawasakirider Grand Master

kawasakirider

Posted
Posted

To eliminate boost leaks you need to eliminate the chance of boost being forced out of the areas that inevitably leak, such as your rocker cover gasket (very prone to boost leaks these little bastards).

The problem lies in the intercooler itself, despite what you may think, the intercooler actually exacerbates your cam cover boost leak mate. When the intercooler fills up with boost, it enters the engine but because there is still an entire intercooler filled with boost, where do you think the excess boost goes? Exactly. Right out the cam cover and into the atmosphere.

To stop this, you simply get rid of the intercooler(s). Leave the intercoolers for the N/A cars, they're good for absolutely nothing on a turbocharged vehicle. By getting rid of your intercooler you have less lag and less built up pressure to to wreak havoc on those poorly designed cam covers.

So go to autobarn or repco, or even chop your neighbours kids' trampoline up and make some turbo piping. Route the piping from the turbo straight to the throttle body. Less lag, less pressure on your cam covers, more customz, more bitches.

Simple as that.

  • Like 3
533 RYC Proficient

533 RYC

Posted
Posted

You all don't know what your on about. The BIGGEST boost leak on an RB is from the little black round container behind the LEFT headlight, the charcoal canister. While eliminating the intercooler will fix the cam cover leak, eliminating the charcoal canister will stop the over fuelling.

You see, when the turbo comes on (boost leaks from the cam covers at this point), boost pushes through the charcoal canister (which filters the boost & mixes with fuel vapour) through to your fuel tank to pressurize it, which makes the turbo REALLY REALLY laggy.

GTRsean Grand Master

GTRsean

Posted
Posted

Also sends turbo pressure to the fuel tank to push fuel into the engine on boost as the fuel pump alone isn't enough.

Thanks why on some cars you get a WHOOOSH noise when you open the fuel cap.

SkudR33 Proficient

SkudR33

Posted
Posted

Also sends turbo pressure to the fuel tank to push fuel into the engine on boost as the fuel pump alone isn't enough.

Thanks why on some cars you get a WHOOOSH noise when you open the fuel cap.

Ahhhh my car doesn't go whoosh, does that mean I need to mount a turbo in the boot just for the petrol tank?

Manuel Kasko Grand Master

Manuel Kasko

Posted
Posted

Also sends turbo pressure to the fuel tank to push fuel into the engine on boost as the fuel pump alone isn't enough.

Thanks why on some cars you get a WHOOOSH noise when you open the fuel cap.

I must be doing it wrong because mine doesn't do this. Does this mean I need a new engine?

I was thinking of upgrading from the RB25 to one of those SR20's anways

Dose Pipe Sutututu Grand Master

Dose Pipe Sutututu

Posted
Posted

You all don't know what your on about. The BIGGEST boost leak on an RB is from the little black round container behind the LEFT headlight, the charcoal canister. While eliminating the intercooler will fix the cam cover leak, eliminating the charcoal canister will stop the over fuelling.

You see, when the turbo comes on (boost leaks from the cam covers at this point), boost pushes through the charcoal canister (which filters the boost & mixes with fuel vapour) through to your fuel tank to pressurize it, which makes the turbo REALLY REALLY laggy.

dafaq?

You know on the charcoal canister there's a valve that stops pressure from going into the canister when there's +ve pressure on the manifold.

Fuel tank is not pressurised on boost, who the hell told you this?

533 RYC Proficient

533 RYC

Posted
Posted

dafaq?

You know on the charcoal canister there's a valve that stops pressure from going into the canister when there's +ve pressure on the manifold.

Fuel tank is not pressurised on boost, who the hell told you this?

:domokun:

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