Adjustable FPR
Discussion
After BBWF and putting my car on the RR, I was told it was underfueling and I needed an adjustable FPR, Ziga has suggested a sytec FPR, just wondered what other people have got and what I should be looking for. Are they all universal or do I need a specific model with certain size connectors, any more info gratefully received.
Hi, I bought a FSE rising rate regulator and fitted it last month. Last year on the BBWF RR the Wedge was under fueling and this year at peak revs it's now over fueling so I'll need to wind it down a little. The FSE unit was easy to install and very easy to set up with the gauge. I'm not sure how good or bad it is quality wise.
Currently got mine set at 38psi which I'll be turning down to 36psi at the weekend. Likewise Bradderztvr fitted one a month ago, also set at 38psi and also over fueling on the RR on Saturday.
http://www.ebay.co.uk/itm/Fuel-Pressure-Regulator-...
Currently got mine set at 38psi which I'll be turning down to 36psi at the weekend. Likewise Bradderztvr fitted one a month ago, also set at 38psi and also over fueling on the RR on Saturday.
http://www.ebay.co.uk/itm/Fuel-Pressure-Regulator-...
Have FSE rising rate. For over 10 years now and happy.
Sytec, think it is the same company, or is it Malpassi...
Seems they don't last very long, mine is on its way out, I think, as the pressure starts to fluctuate.
Have also been looking at Alpha as a brand, not sure it is rising rate which gives an extra boost (flapper only) and I prefer.
Haven't made my mind up yet.
Rob
edit: have it at 2.7 bar (psi?) as per Steve Heath and best/good results.
Sytec, think it is the same company, or is it Malpassi...
Seems they don't last very long, mine is on its way out, I think, as the pressure starts to fluctuate.
Have also been looking at Alpha as a brand, not sure it is rising rate which gives an extra boost (flapper only) and I prefer.
Haven't made my mind up yet.
Rob
edit: have it at 2.7 bar (psi?) as per Steve Heath and best/good results.
Edited by 350zwelgje on Wednesday 8th July 18:09
gmw9666 said:
What made me laugh they suggested getting an adjustable FPR to pretty much everyone regardless of under or over fuelling
They should have had a box in the van and sold them ;-)
I must have been the only person all day that they didnt suggest the adjustable FPR to, they said my fuelling was spot onThey should have had a box in the van and sold them ;-)
gmw9666 said:
What made me laugh they suggested getting an adjustable FPR to pretty much everyone regardless of under or over fuelling
They should have had a box in the van
They did..And fuel pumps..Although they looked a bit rough...i:e NOT new...Not something i would use...They should have had a box in the van
I would leave it at 38psi..When mine was at 40-42psi it was so rich that it would fail an MOT.
The pressure in the rail fluctuates and as said it changes throughout its operation..Mine was set to 38psi at my last MOT and the emissions were spot on..It may be over-fuelling but it will be marginal and i would prefer a tad on the rich side than on the lean!...
25-27psi (1.8bar) is where it should be when on idle....The dyno obviously didn't have time to do any adjustments as i did ask for them to tweak anyones Wedge with an adjustable FPR..They had all the equipment needed...
mrzigazaga said:
They did..And fuel pumps..Although they looked a bit rough...i:e NOT new...Not something i would use...
I would leave it at 38psi..When mine was at 40-42psi it was so rich that it would fail an MOT.
The pressure in the rail fluctuates and as said it changes throughout its operation..Mine was set to 38psi at my last MOT and the emissions were spot on..It may be over-fuelling but it will be marginal and i would prefer a tad on the rich side than on the lean!...
25-27psi (1.8bar) is where it should be when on idle....The dyno obviously didn't have time to do any adjustments as i did ask for them to tweak anyones Wedge with an adjustable FPR..They had all the equipment needed...
What I found surprising was that at 3000rpm my Wedge had 7bhp and 15 lb/ft more power and torque than last year no doubt due to the new regulator. It was just over fueling at max revs which obviously zapped 3bhp from the max. The mid range grunt and driveability is just so much better than with the standard regulator. The power curve last year was very low until the revs picked up until almost 4000rpm. The curve this year is surprisingly more linear and progressive.I would leave it at 38psi..When mine was at 40-42psi it was so rich that it would fail an MOT.
The pressure in the rail fluctuates and as said it changes throughout its operation..Mine was set to 38psi at my last MOT and the emissions were spot on..It may be over-fuelling but it will be marginal and i would prefer a tad on the rich side than on the lean!...
25-27psi (1.8bar) is where it should be when on idle....The dyno obviously didn't have time to do any adjustments as i did ask for them to tweak anyones Wedge with an adjustable FPR..They had all the equipment needed...
I was also told that mine was running rich so I checked the fuel pressure when I got back.
Looking on the act website, I read an interesting thing on how to set the pressure, first with air vacuum pipe connected to regulator and then without ( with two figures )
I set mine up to 40 psi a while back but didn't remove the vacuum and check second. Mine dropped about 4 psi which is not enough! Adjusted the reg to 28 with no vacuum and now is 38 with vacuum connected. My understanding is the reg was wound in so almost Max pressure, hence small difference. Runs far sweeter!
Anyway, here is the link
http://www.actproducts.co.uk/2011/lucas-14cux-fuel...
Looking on the act website, I read an interesting thing on how to set the pressure, first with air vacuum pipe connected to regulator and then without ( with two figures )
I set mine up to 40 psi a while back but didn't remove the vacuum and check second. Mine dropped about 4 psi which is not enough! Adjusted the reg to 28 with no vacuum and now is 38 with vacuum connected. My understanding is the reg was wound in so almost Max pressure, hence small difference. Runs far sweeter!
Anyway, here is the link
http://www.actproducts.co.uk/2011/lucas-14cux-fuel...
Thanks Matt...Nice piece of info from Tim....Also make sure you have run up to normal operating temperature when setting your WOT psi..Its also better to clamp off the vacuum rather than removing it as the plenum will be sucking in a lot air if just removed...This may lead to a false reading..When i do it this way i monitor the pressure over a week..There are fluctuations..(Normal) but it always settles down after a period of rest..2 days normally.
The fall pressure can also fall quickly if you have a leaky injector...But this would be determined only by clamping off the return to the tank....You just reminded me also as regards to testing it whilst under load...Although my endoscope is a bit big for strapping to the underside of the bonnet and apart from getting melted it would probably come off and cause some serious injury...Or it will just get Wedged...
The fall pressure can also fall quickly if you have a leaky injector...But this would be determined only by clamping off the return to the tank....You just reminded me also as regards to testing it whilst under load...Although my endoscope is a bit big for strapping to the underside of the bonnet and apart from getting melted it would probably come off and cause some serious injury...Or it will just get Wedged...
It's not surprising that the rolling road guys suggested an adjustable FPR to everyone; fuel pressure is about the only thing you can play with on the standard 14CU injection system.
The mixture screw on the AFM only affects things at low throttle openings so won't affect full throttle runs. Playing with the timing would affect peak power but is likely to mess up cold starts and lower engine speeds. I can't think of anything else you could easily fiddle with; beyond those things you're into changing spring tension in the AFM or messing with the coolant temperature sensor resistance, neither of which are for the faint hearted and will have their downsides.
The mixture screw on the AFM only affects things at low throttle openings so won't affect full throttle runs. Playing with the timing would affect peak power but is likely to mess up cold starts and lower engine speeds. I can't think of anything else you could easily fiddle with; beyond those things you're into changing spring tension in the AFM or messing with the coolant temperature sensor resistance, neither of which are for the faint hearted and will have their downsides.
Bobby Shaftoe said:
How far out was your fuelling taffo, have you got the dyno sheet to post up?
The only slight problem with the adjustable FPR's is they adjust fuelling everwhere, not just wide open throttle, but also cruise and idle (though this can be tweaked slightly with the idle air bypass screw).
If you want, i've got a spare a adjustable FPR which you can have for a few beer tokens and an up the tailpipe wideband we could set it up with.
Just been away to the land of no internet (Filey) so just seen your reply, here are the Dyno sheets. The only slight problem with the adjustable FPR's is they adjust fuelling everwhere, not just wide open throttle, but also cruise and idle (though this can be tweaked slightly with the idle air bypass screw).
If you want, i've got a spare a adjustable FPR which you can have for a few beer tokens and an up the tailpipe wideband we could set it up with.
KKson said:
Hi, I bought a FSE rising rate regulator and fitted it last month. Last year on the BBWF RR the Wedge was under fueling and this year at peak revs it's now over fueling so I'll need to wind it down a little. The FSE unit was easy to install and very easy to set up with the gauge. I'm not sure how good or bad it is quality wise.
Currently got mine set at 38psi which I'll be turning down to 36psi at the weekend. Likewise Bradderztvr fitted one a month ago, also set at 38psi and also over fueling on the RR on Saturday.
http://www.ebay.co.uk/itm/Fuel-Pressure-Regulator-...
Colin - I think this is the one fitted by the Phils to mineCurrently got mine set at 38psi which I'll be turning down to 36psi at the weekend. Likewise Bradderztvr fitted one a month ago, also set at 38psi and also over fueling on the RR on Saturday.
http://www.ebay.co.uk/itm/Fuel-Pressure-Regulator-...
HTH
KKson - I think it is set at 36psi
Cheers
Trickie
I have a FSE rising rate regulator for a V8 in the garage that I don't use any more and if any wants it just email me and we can come up with a price, not sure what second hand units are worth...
For me, the best way to measure pressure in the fuel rail is to use the 9th injector take off pipe and connect it to a gauge, job done as I run one on the car all the time as I have no 9th injector and the gauge is oil filled stainless steel.
For me, the best way to measure pressure in the fuel rail is to use the 9th injector take off pipe and connect it to a gauge, job done as I run one on the car all the time as I have no 9th injector and the gauge is oil filled stainless steel.
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