David P

Without engine vacuum the charcoal filter still "gurgles", this is relieving positive tank pressure and filtering out the fuel vapours. All you need to do is pull off the tank hose to prove it.

I really can't understand why it can't be understood that without positive pressure the charcoal filter would be an ornament? When I get my manuals back and can be arsed to find again and read again what others apparently can't, I'll take a pic and post it.

Just pull off the tank hose of the charcoal filter when it is "ticking" and you will find that it blows, not sucks.

Nothing of the sort, yet at this time my workshop manuals are on loan to A. N. Other. I don't tell lies, but if you are so determined to prove me wrong, you will have to keep reading until you prove me correct.

Try reading the Workshop Manual, there it is clearly explained.

The charcoal filter relieves petrol vapours from positive pressure. That's what it is for! The fuel cap is a 2psi positive pressure relief valve. Please research this instead of blindly following an old wives tale.

If it was a vacuum, Mr T. would not have wasted profit fitting a charcoal filtration system to filter fuel vapours from the positive pressure.

Rattling petrol about in a sealed tank creates vapour which creates pressure faster than a fuel pump can reduce it, not vacuum. It is this positive pressure that the charcoal filter system is all about, which without pressure to push these vapours through it, would be merely an ornament and the pressure relief valve is a one way, out only valve. Suck and blow makes a similar noise, but suck would stick the cap to the tank, which it doesn't.

No gain at all unless the space it used was required for an after market Gizmo.

Pot: A term for marijuana of any sort. Pod: A protective compartment, as for an auto-mobile's instrument gauges. I thought it was worth a chuckle, maybe it was lost in translation?

They can be hard to see.

Excuse the off topic. For me to update the records, how much torque has that Hybrid transmission been taken to?

Fit an oil cooler and whilst you're under there, a 3" cat-less exhaust system, get the map tweaked and have fun.

4" kakyourmoto on an N/A, if that is without cats, your ears must bleed. A 2 1/2" two box system suits an N/A, all 3" exhausts sound pants.

Knock is another word for pre-ignition and the pic shows what this can do.

Has the charcoal filter been removed and the tank vent left open? If so, the fuel system will be running at 2psi less.

Penance for throwing Supra Treasures away.

No harm done, fit an oil cooler and all will be fine.

More power requires burning more fuel, burning more fuel generates more heat. It would be a good idea to fit an oil cooler.

Charcoal Canister removal mod I have looked into the charcoal canister removal mod, and it appears that no one has thought the job through properly! The Supra fuel tank and pump are designed to operate at a positive pressure of 2psi. The fuel filler cap, is a 2psi relief valve, maintaining pressure on charcoal filter up to 2psi and gently venting excess. Without the pressure gurgling out through the charcoal filter, the cap has a little more relieving to do. 3 pipes on charcoal canister, listed below with direction of flow. 1 goes to induction vacuum. 1 comes from fuel tank. 1 goes to drain. Remove vacuum pipe from inlet manifold and cap it off. Pipe to fuel tank can be capped, or removed completely and blanked off on tank. Drainpipe can be left open, or removed completely. Simples ! A tidier job and minor weight reduction is made by removing pipes and blanking at source. (An even simpler explanation is; remove it and blank off the pipes.)

I've not tinkered with a VVTI variant, yet disconnecting the battery for a while should reset ECU functions.

Rhymes with "hat". Maybe Porsche need Owner Manuals by text message?

Get a second hand cat and replace it. N/A and T.T. are same.

Give Keron a call.

Thank you, it's an Eaton M112. You'll need to do better than a cable tie to secure that heat shield and it needs a gap to prevent conducted heat.