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#30
by
RabbitJockey
on 12 Oct, 2011 15:19
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so how would you get the pressure curve of the yellow dot? you would need the regulator from it with the matching advance spring?
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#31
by
92EcoDiesel Jetta
on 12 Oct, 2011 15:49
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Finally put some miles on familair roads with the higher internal pump pressure. At 2500 rpm, it's at 80 psi, 5 psi above spec for my pump. I can say that the car has more power throughout the rpm range. Hills that I used to have trouble maintaining speed in 5th, I now have no problems and can actually accelerate up them.
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#32
by
Mark(The Miser)UK
on 12 Oct, 2011 17:01
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Finally put some miles on familair roads with the higher internal pump pressure. At 2500 rpm, it's at 80 psi, 5 psi above spec for my pump. I can say that the car has more power throughout the rpm range. Hills that I used to have trouble maintaining speed in 5th, I now have no problems and can actually accelerate up them.
Just the same as advancing your pump slightly, is it not?
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#33
by
Mark(The Miser)UK
on 13 Oct, 2011 00:27
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so how would you get the pressure curve of the yellow dot? you would need the regulator from it with the matching advance spring?
Basically yes.
Maybe a softer than yellowdotspring would work too with a standard regulator spring?
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#34
by
92EcoDiesel Jetta
on 13 Oct, 2011 04:44
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Finally put some miles on familair roads with the higher internal pump pressure. At 2500 rpm, it's at 80 psi, 5 psi above spec for my pump. I can say that the car has more power throughout the rpm range. Hills that I used to have trouble maintaining speed in 5th, I now have no problems and can actually accelerate up them.
Just the same as advancing your pump slightly, is it not?
IDK. My pump timing is set at 1.0 mm but have not played with it yet. Wouldn't starting be different?
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#35
by
ORCoaster
on 13 Oct, 2011 10:14
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Mark and ECO92, Kicking back the timing to a more retarded condition and upping the internal pressure is what gives my ride the miles per gallon and the performance I have. Seems that it starts just fine on cooler morings, 40F is about as cold as I get. Running the gauge allows me to see the difference between the cruise at 65 mph in fourth versus fifth. In 4th I am right up at 75 psi and in 5th I drop down to about 62.5. That is a big difference in how the advance is treated. I can really move once the pressure exceeds say 65 but it lugs a lot below that. So my thought is to run more pressure and let it do the advance instead of trying to get it there with the initial timing.
By keeping the initial time a little retarded I think it helps keep the knock down at mid speed cruising like 25 to 40 mph.
Going to go with it a while and see where the mileage comes out.
ECO92, your performance at the higher RPMs wouldn't be do to the fuel mix screw adjustment being in a half turn more than normal is it?
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#36
by
92EcoDiesel Jetta
on 14 Oct, 2011 05:58
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I don't really know since my fuel screw has been messed with. But I can say that it is aprox at the same setting as another untouched pump and I am not getting any smoke when I floor the pedal. My static timing is set at 1.0 mm currently. I will drive it for a few tanks with the current setting and see if MPG improves, then adjust the (static) timing down/up and see what it does MPG and performance wise.
Pressure is a function of rpm. You are seeing higher pressure in 4th because your engine is at a higher rpm in 4th at 65 mph than 5th at 65 mph.
Mark and ECO92, Kicking back the timing to a more retarded condition and upping the internal pressure is what gives my ride the miles per gallon and the performance I have. Seems that it starts just fine on cooler morings, 40F is about as cold as I get. Running the gauge allows me to see the difference between the cruise at 65 mph in fourth versus fifth. In 4th I am right up at 75 psi and in 5th I drop down to about 62.5. That is a big difference in how the advance is treated. I can really move once the pressure exceeds say 65 but it lugs a lot below that. So my thought is to run more pressure and let it do the advance instead of trying to get it there with the initial timing.
By keeping the initial time a little retarded I think it helps keep the knock down at mid speed cruising like 25 to 40 mph.
Going to go with it a while and see where the mileage comes out.
ECO92, your performance at the higher RPMs wouldn't be do to the fuel mix screw adjustment being in a half turn more than normal is it?
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#37
by
ORCoaster
on 14 Oct, 2011 17:48
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Pressure is a function of rpm. You are seeing higher pressure in 4th because your engine is at a higher rpm in 4th at 65 mph than 5th at 65 mph.
Figured that, what I see is that once I get that little bit over 65 psi it really takes off. I don't have a tach so I would have to figure it out with the speedo calculator to see what RPM I am running at in those gears and speeds with the 155's on now.
Hunting an exhaust header over the weekend. Price is being negotiated, may be breathing easier next trip up and back.
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#38
by
R.O.R-2.0
on 15 Oct, 2011 17:45
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Pressure is a function of rpm. You are seeing higher pressure in 4th because your engine is at a higher rpm in 4th at 65 mph than 5th at 65 mph.
Figured that, what I see is that once I get that little bit over 65 psi it really takes off. I don't have a tach so I would have to figure it out with the speedo calculator to see what RPM I am running at in those gears and speeds with the 155's on now.
Hunting an exhaust header over the weekend. Price is being negotiated, may be breathing easier next trip up and back.
told you i had one that i would almost give you..
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#39
by
ORCoaster
on 15 Oct, 2011 22:11
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But I gotta drive all the way up north to get it. This one is new in box and local. But I didn't forget your offer. It may end up costing the same between fuel, and time. I will be taking time off from work in the next month and I may just have to arrange something with you if this fails to produce any good results. Thanks.
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#40
by
R.O.R-2.0
on 16 Oct, 2011 10:23
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But I gotta drive all the way up north to get it. This one is new in box and local. But I didn't forget your offer. It may end up costing the same between fuel, and time. I will be taking time off from work in the next month and I may just have to arrange something with you if this fails to produce any good results. Thanks.
astoria isnt that far from portland.. if you drive 26, your less than 25 miles from me at times..
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#41
by
ORCoaster
on 16 Oct, 2011 11:23
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PM Time!
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#42
by
92EcoDiesel Jetta
on 21 Nov, 2011 18:18
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I thought I'd update this thread since I've upped the internal IP pressure to spec and accumulated some miles. It's been running great! More power, less smoke. I used to see smoke at night in the rear view mirrow from headlights behind when i stomp on it. This is no longer the case, it is burning much cleaner. A slight leak just developed in the top IP cover seal. Luckily, it's and easy one and can be done without pulling the IP.
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#43
by
ToddA1
on 22 Nov, 2011 21:47
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So was your guess of 32psi @ 1,000 rpm, correct?
Have you been tracking your milage, and if so, how does it compare to "before"?
-Todd
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#44
by
92EcoDiesel Jetta
on 23 Nov, 2011 09:03
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So was your guess of 32psi @ 1,000 rpm, correct?
Have you been tracking your milage, and if so, how does it compare to "before"?
-Todd
I didn't guess. I got the spec from a Bosch diesel shop. 32 psi @ 1000 is not correct BTW for my pump. I have not been tracking my mileage. I get 550 to 600 miles per tank.