Thread: Rumble.

Originally Posted by Dougal

Yes. I have done it, before I found out the pump I retrofitted the aneroid to had a different size shaft and wouldn't accept the drive gear.
You need the aneroid and brackets, the pushrod with spring, drill a hole through the back casing of the pump and attach the flag to the rack lever inside so the pushrod has something to push against.

But the aneroids job is to decrease fuelling when off boost, it's a smoke control device and can't make your pump deliver more fuel.

While we're at it, got any more info on the boost aneroid, as mine is very smokey off boost and like the idea of cleaning it up, Don't want to turn down the fuel

Pics?

The aneroid is on a lever which has just one adjustment, a screw with locknut on one end of the lever. This adjustment point hides behind a cap about 16mm round beside the aneroid pressure can.

To getinto it you'll need a thin wall socket to loosen the locknut then a small flat screwdriver to turn the screw.

Winding the screw out increases fuel off-boost. Winding the screw in reduces fuel off-boost.
I went the wrong way the first time and had a 20 second 0-50km/h sprint.

Regarding the rumble. I have concluded that it's due to insufficient flywheel inertia for the torque I'm producing at such low rpm.
My 2.2L nissan work car has a flywheel of similar weight to the 4BD1T flywheel.
I do have a plan to add mass to the flywheel to cure this problem, but it's some time away.