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Removing Charcoal Canister

BlackBox

By BlackBox,
in R Series (R30, R31, R32, R33, R34)

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BlackBox Rising Star

BlackBox

Posted
Posted

Hi,

I have a r34 GTT and i want to remove the charcoal canister to tidy up the engine bay.

I have tried searching and have read a bit but i'm still not positive on what needs to vent and block. From what i understand they should all be blocked besides the one coming from the tank which should be vented with a breather?

I would like to remove all the lines possible instead of just looping them together, but im not sure which line goes back to the tank. Is my diagram correct?

Also when i remove my fuel cap it makes a 'whooshing' sound (Air entering/escaping) would this mean that their is already a problem with it venting?

post-90047-0-52240200-1353999781_thumb.jpg

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https://www.sau.com.au/forums/topic/414541-removing-charcoal-canister/
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  • 3 weeks later...
  • 5 years later...
NEO25T Collaborator

NEO25T

Posted
Posted

Hi guys just wondering if i could get some info on the carbon canister for an r34 gtt.

Mine is partially disconnected and gives a terrible fuel smell when starting the car.

It has 2 metal lines running to the back of the car, then there is a vent with a one way valve on the bottom of the can  letting air in and a vacuum line running up to the manifold through a solenoid.

Am i able to remove this solenoid and connect the vac line to the air filter pipe?

A few things are changing on the car at the moment so would be easier to do this now rather than later.

  • 7 years later...
R3N3 Proficient

R3N3

Posted
Posted

I’m one of these idiots.. because ‘race car’ doesn’t really apply either.. I mainly did it to clean up the engine bay. Fortunately, rules in NZ are more relaxed and this isn’t illegal to remove.

  • Like 1
joshuaho96 Veteran

joshuaho96

Posted
Posted (edited)
19 hours ago, silviaz said:

Why do people remove these canisters on rb's?

People think it's a waste of space, ugly, etc, generally associate "emissions control equipment" with "bad". These OBD1 vacuum-only systems I'm not a huge fan because I think they don't go far enough. They're wasting some of the fuel captured because they start purging as soon as the engine pulls vacuum. Later OBD1/OBD2 they put an electric purge valve on them to vent only when closed loop is active so the ECU will trim some fuel out. Even later OBD2 with zero evaporative loss the tank is 100% sealed from atmosphere until you run the engine or press the refuel door release. The tank has to take much higher vacuum/pressure spec but you never deal with saturating the charcoal canister and losing some fuel that way. The fuel also lasts as long as it would in a 100% airtight container which is nice when you're dealing with modern E10 pump gas.

Edited by joshuaho96
  • Like 1
silviaz Experienced

silviaz

Posted
Posted
1 hour ago, joshuaho96 said:

People think it's a waste of space, ugly, etc, generally associate "emissions control equipment" with "bad". These OBD1 vacuum-only systems I'm not a huge fan because I think they don't go far enough. They're wasting some of the fuel captured because they start purging as soon as the engine pulls vacuum. Later OBD1/OBD2 they put an electric purge valve on them to vent only when closed loop is active so the ECU will trim some fuel out. Even later OBD2 with zero evaporative loss the tank is 100% sealed from atmosphere until you run the engine or press the refuel door release. The tank has to take much higher vacuum/pressure spec but you never deal with saturating the charcoal canister and losing some fuel that way. The fuel also lasts as long as it would in a 100% airtight container which is nice when you're dealing with modern E10 pump gas.

That makes sense. Thanks!

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