Vacuum Hose's On Itb's

[flameredturbo]

Do I plug? Or feed onto the fuel pressure reg? GSXR1000 itbs not sure what to do with them.

[Snapperpaul]

Inlet manifold vac for brake servo or ignition advance if running MAP

If your running TPS and no servo, Plug

Not sure about fuel rail pressure regulator, some are fixed some have vac connection

[Dave R]

i always understood that you only put vac on a fuel reg if the engine was turbo-ed, to allow for the boost pressure

[flameredturbo]

Thanks to both, running tps and no turbo so both will be capped off.

[steve in stockport]

Not true Dave, a lot of efi cars have the fuel pressure reg operated by vacuuum, the efi pinto engine being just one example.

It helps vary the fuel pressure to match the engine load.

[Dave R]

yet another variable then to live with............. didnt know that!

 

i know with omex and the like, you only tend to connect if blown

[Longboarder]

I think the jury is out still to some extent on variable fuel pressure. Normaly aspirated it's slower to react than TPS to vary injection quantity and far more crude. If using MAP for load then isn't it measuring and adjusting for the same input parameter.

With a forced induction engine its a different ballgame.

I use TPS and fixed fuel pressure.

 

Nigel