This is a subject which has been discussed before. I believe the basic wisdom is that there's absolutely nothing wrong with the standard pump and it's free! It should also simplify a range of other elements in the engine bay so worth going with unless you have specific objectives that it cannot achieve.
Last edited by Jeff; 13-06-2015 at 09:50.
I was wondering, where do you pull a vacuum for the pressure gauge. Normally it would come from the intake, but I don't see anywhere on these throttle bodies to attach a vacuum line.
Don't think jenvey users have any vac lines connected. My 6 bodies have ports which are connected to a remote vessel, this has take offs for a pressure regulator, brake booster/servo if needed and the idle valve.
Last edited by strat24v; 16-06-2015 at 07:30.
Not quite sure about vacuum for a pressure gauge?Originally Posted by tipo158
But I drilled and tapped just one inlet runner for the servo (booster) take off. Works just Fine. No issues at all, ( it was always common practice for multi carb set ups back in the day too) it does run through a standard non return valve, but you would be using that wth any servo take off.
If you needed vacuum for anything else, I'm sure it would work just as well, however you would most likely see the pulses on a guage unless you dampened it out. (A piece of threaded rod in the hose may do the trick...Early Turbo boost fooling trick to bleed pressure or vacuum slowly)
Rob
Last edited by Sando; 16-06-2015 at 07:47.
All bike throttle bodies have vac Lines from each body that are all the same length. All run to a common connection then on in a single line to the fuel pressure regulator. Been as bikes are by far the biggest users of throttle bodies, I figured they'd have done the most r&d so followed that lead.
Last edited by strat24v; 16-06-2015 at 10:52.
Here is a diagram of the Jenvey pressure regulator, as you can see, there is a vacuum port. Sorry, I meant pressure regulator, not gauge.
Last edited by tipo158; 16-06-2015 at 16:10.
To my knowledge this port is never connected to anything when using a separate jenvey throttle bosy and watever specific ECU ( Emerals or any )
I think its up to you whether you use it or not. The fuel map will be written to take account either way, just make sure that you don't alter it after its been mapped. If you don't connect it to vacuum then it should be left open to atmosphere and not blocked off.
Dave
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