Fuel system pressures - B3 KV

Duffy3074 · 27-10-20, 04:31 PM

Guys

Been checking the operation of the WUR on E-Lad today with a pressure guage. Anybody have a definitive answer on the correct pressures and temperatures for it?

Part number for the WUR is 035 133 403E

Cheers

mikes2 · 27-10-20, 07:35 PM

There's numbers for this in my 2.6 thread. I had the regulator rebuilt so before & after...

System pressure set to 5,0 bar.
Cold at 10 degrees 0,9 bar.
Cold at 10 degrees with 600 mbar vacuum at the side port 1,6 bar.
To heat up the bi metal at 13,5 volt has 1,08 ampere.
Warm the control pressure was 2,9 bar.
Warm the control pressure with 600 mbar vacuum was 4,1 bar (to high)

After rebuild

System pressure set to 5,0 bar.
Cold at 10 degrees 0,4 bar.
Cold at 10 degrees with 600 mbar vacuum at the side port 1,0 bar.
To heat up the bi metal at 13,4 volt has 1,01 ampere.
Warm the control pressure was 3,0 bar.
Warm the control pressure with 600 mbar vacuum was 3,5 bar

Duffy3074 · 27-10-20, 07:52 PM

Thanks Mike, I did flick through your thread and saw the pictures of your new WUR but didn't see the figures
Much appreciated!

mikes2 · 27-10-20, 07:57 PM

July last year was when it got done. rebuild was 275 Euros.

KMI - never answer the phone
ATP - they were moving premises and couldn't help for 3 months

Ferrari400parts got the business.

Think they sell the kits if you're feeling adventurous.

Duffy3074 · 27-10-20, 08:19 PM

Emailed KMI and got a reply within the hour, £200 plus vat plus postage.
Did think about a kit, the tricks in calibrating it afterwards
I’ve given it a good ultrasonic clean and will do a full cold to hot cycle once I’ve got a vacuum gauge and T piece.
It’s a lorra dosh!

Duffy3074 · 28-10-20, 05:07 PM

http://forums.pelicanparts.com/porsc...ed-my-wur.html

I’m tempted to go down this road and get a rebuild kit too.
All in between a third and half the price of getting it reconditioned

Duffy3074 · 29-10-20, 01:14 PM

Did a full cold to hot this morning

Ambient temp was 10 degrees

Cold start pressure was 1.4 bar 20 psi
Hot with vacuum was 4 bar 58-60 PSI
Hot without vacuum was 2.8 bar/40 PSI

So compared to Mike's rebuilt WUR it's all too high (which ties in with the emissions)

I didn't have a vacuum gauge but disconnected the vacuum line (which I blocked off obviously) for one of the readings and suddenly the car started to idle much more smoothly.

Steve at KMI had said that I should check that the WUR held vacuum and this would suggest to me that it doesn't albeit there's a possibility that the reduction in fuel pressure accounted for the better running

Interesting! Choice now is whether to DIY or not?

Duffy3074 · 30-10-20, 01:47 PM

https://www.ebay.co.uk/itm/184409839635

Ordered one of these, I’ve got what I need to mod it already, the kit comes with instructions that I’ll share here.

Diy’ing reduces the cost from £260 to £74.74 and means it’s adjustable

Mellis46 · 30-10-20, 07:48 PM

Quote:

Originally Posted by Duffy3074

Choice now is whether to DIY or not?

Got to be DIY and a thread?!

Duffy3074 · 30-10-20, 08:12 PM

Being Scottish I’m reluctant to hand over my hard earned to somebody for something I can do myself

Bits are in the post

27-10-20, 07:35 PM	#2
mikes2 4 ring whore! Classic Audi Club Member Join Date: Nov 2007 Location: Polmont Posts: 2,617	There's numbers for this in my 2.6 thread. I had the regulator rebuilt so before & after... System pressure set to 5,0 bar. Cold at 10 degrees 0,9 bar. Cold at 10 degrees with 600 mbar vacuum at the side port 1,6 bar. To heat up the bi metal at 13,5 volt has 1,08 ampere. Warm the control pressure was 2,9 bar. Warm the control pressure with 600 mbar vacuum was 4,1 bar (to high) After rebuild System pressure set to 5,0 bar. Cold at 10 degrees 0,4 bar. Cold at 10 degrees with 600 mbar vacuum at the side port 1,0 bar. To heat up the bi metal at 13,4 volt has 1,01 ampere. Warm the control pressure was 3,0 bar. Warm the control pressure with 600 mbar vacuum was 3,5 bar __________________ 1991 90 quattro 20v sport 1991 90 quattro

27-10-20, 07:57 PM	#4
mikes2 4 ring whore! Classic Audi Club Member Join Date: Nov 2007 Location: Polmont Posts: 2,617	July last year was when it got done. rebuild was 275 Euros. KMI - never answer the phone ATP - they were moving premises and couldn't help for 3 months Ferrari400parts got the business. Think they sell the kits if you're feeling adventurous. __________________ 1991 90 quattro 20v sport 1991 90 quattro

29-10-20, 01:14 PM	#7
Duffy3074 4 ring whore! Classic Audi Club Member Join Date: Aug 2015 Location: Dalgety Bay, Fife Posts: 2,078	Did a full cold to hot this morning Ambient temp was 10 degrees Cold start pressure was 1.4 bar 20 psi Hot with vacuum was 4 bar 58-60 PSI Hot without vacuum was 2.8 bar/40 PSI So compared to Mike's rebuilt WUR it's all too high (which ties in with the emissions) I didn't have a vacuum gauge but disconnected the vacuum line (which I blocked off obviously) for one of the readings and suddenly the car started to idle much more smoothly. Steve at KMI had said that I should check that the WUR held vacuum and this would suggest to me that it doesn't albeit there's a possibility that the reduction in fuel pressure accounted for the better running Interesting! Choice now is whether to DIY or not? Last edited by Duffy3074; 29-10-20 at 01:39 PM.

27-10-20, 07:52 PM	#3
Duffy3074 4 ring whore! Classic Audi Club Member Join Date: Aug 2015 Location: Dalgety Bay, Fife Posts: 2,078	Thanks Mike, I did flick through your thread and saw the pictures of your new WUR but didn't see the figures Much appreciated!

27-10-20, 08:19 PM	#5
Duffy3074 4 ring whore! Classic Audi Club Member Join Date: Aug 2015 Location: Dalgety Bay, Fife Posts: 2,078	Emailed KMI and got a reply within the hour, £200 plus vat plus postage. Did think about a kit, the tricks in calibrating it afterwards I’ve given it a good ultrasonic clean and will do a full cold to hot cycle once I’ve got a vacuum gauge and T piece. It’s a lorra dosh!

28-10-20, 05:07 PM	#6
Duffy3074 4 ring whore! Classic Audi Club Member Join Date: Aug 2015 Location: Dalgety Bay, Fife Posts: 2,078	http://forums.pelicanparts.com/porsc...ed-my-wur.html I’m tempted to go down this road and get a rebuild kit too. All in between a third and half the price of getting it reconditioned

30-10-20, 01:47 PM	#8
Duffy3074 4 ring whore! Classic Audi Club Member Join Date: Aug 2015 Location: Dalgety Bay, Fife Posts: 2,078	https://www.ebay.co.uk/itm/184409839635 Ordered one of these, I’ve got what I need to mod it already, the kit comes with instructions that I’ll share here. Diy’ing reduces the cost from £260 to £74.74 and means it’s adjustable

30-10-20, 08:12 PM	#10
Duffy3074 4 ring whore! Classic Audi Club Member Join Date: Aug 2015 Location: Dalgety Bay, Fife Posts: 2,078	Being Scottish I’m reluctant to hand over my hard earned to somebody for something I can do myself Bits are in the post