Power boost valve fitting

[dickymint]

Hope you all got back from Mania Ok. Excellent pics in other thread guys.Will be going next year for cert.

Just got my new PBV and will fit it tommorrow whatever it takes cos i cant wait.
Does anybody have any pics/tips and/or advice on the easiest way to mount it?
Read the Bible and cos im to impatient gonna assume the fuel pump is up to scratch!
Also bought the pressure gauge to go with it.Is it ok to permanently keep it in?

[350zwelgje]

Fitted mine against the bulkhead.
Have left the pressure gauge on it since installation a couple of months ago. No problems so far.
It is useful to keep the gauge installed, because you have to check the pressure after a couple of hundred miles or so.
I also have the experience now that I have to re-set the pressure from time to time! Probably because I haven't yet fettled with the air bleed valve as described in the bible.
I didn't bother to check the fuel pump either, especially when the gauge indicated over 5 bar (!) on installation. So it must be up to its job.

In general instant fun (=better acceleration) with a power boost valve. And the slight hint of pinking I had when the tank was less than 1/3 has gone as well.
But economy suffers badly! But only when you go for out and out acceleration (trackday.... 10 mpg).
Also the petrol gauge reading is influenced. It shows empty more early, and comes back to a "normal" reading after not accelerating for a couple of minutes. I assume this is due to the higher volume being pumped around, lowering the level of petrol that can be metered.

Have fun.

Rob

Editted for remark:
Be careful with the fuel lines. Mine were all new when the PBV was installed. Otherwise you could have a risk of them bursting.


>> Edited by 350zwelgje on Sunday 10th August 17:07

[dickymint]

What a big improvement. Every time i put my foot down im grinning like a Cheshire cat.
If you aint got one of these thenGET ONE NOW.

Fitted to bulkhead as suggested by 350zwelge. Stays nice and cool there.

Hes right about the fuel guage. Mine now fluctuates madly on acceleration-thinking of recalibrating the dial and calling it an economy gauge(ala BMW)

[blackpoolwedge]

Sounds great, where do I get one???

[dickymint]

www.motorsportworld.co.uk/frame-detail.asp?PAGE=/fse-power-boost-valves.htm
Got mine from here. But are available from your local outlets. £69 plus about £15 for the guage. You will not be dissapointed.

[blackpoolwedge]

Thanks, I will be placing an order very soon

[wedg1e]

Now there's a thing. My car has the variable fuel pressure regulator fitted (NOT the FSE thing, just the vacuum-operated device that the 390SE and others got).
The fuel pressure DECREASES as the revs rise. I didn't think about it before, but surely the pressure should RISE to get more fuel through the injectors?
If that's the case, is my car actually losing power the faster I go?

Ian

[BILTEL]

Ive only had experiance of fuel pressure regulators on a turbocharged car, and that rises A Lot as the boost builds up. So I would imagine it should be risisng on the 390 to keep up with its thirst as the revs rise.

[gf350]

wedg1e said:

Now there's a thing. My car has the variable fuel pressure regulator fitted (NOT the FSE thing, just the vacuum-operated device that the 390SE and others got). The fuel pressure DECREASES as the revs rise. I didn't think about it before, but surely the pressure should RISE to get more fuel through the injectors? If that's the case, is my car actually losing power the faster I go? Ian

Ian,
Is yours connected wrong. I have the same vacuum-operated valve as you and its connected to the fuel return pipe that goes to the left hand tank, this would have the effect of increasing the pressure in the fuel rail if the valve is closing at higher revs?

Gareth.

>> Edited by gf350 on Thursday 14th August 12:32

[2 sheds]

It can be mis-leading, the fuel pressure will increase with lower or no vacuum , to test this you need the throttle open and engine running, i.e in gear, so you can't really tell from a static test.
Tim

[wedg1e]

2 sheds said:

It can be mis-leading, the fuel pressure will increase with lower or no vacuum , to test this you need the throttle open and engine running, i.e in gear, so you can't really tell from a static test. Tim

Aye, that'll be it then!
Ye cannae change the laws of physics, Jim....

Ian

[dickymint]

wedg1e said:

Now there's a thing. My car has the variable fuel pressure regulator fitted (NOT the FSE thing, just the vacuum-operated device that the 390SE and others got). Ian

Surely the FSE thing and your thing is the same thing?
(FSE works off plenum vacuum)

[wedg1e]

dickymint said:

wedg1e said: Now there's a thing. My car has the variable fuel pressure regulator fitted (NOT the FSE thing, just the vacuum-operated device that the 390SE and others got). Ian Surely the FSE thing and your thing is the same thing? (FSE works off plenum vacuum)

Hmmm... I think the FSE unit is rising-rate, whereas presumably the one I have is linear-rate. The standard V8 one is non-adjustable, whereas mine and the FSE can be set to whatever base pressure you fancy
Anyone want to give me some shares in an oil refinery?

Ian