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yellow dot pump on a 1.6
by
RabbitJockey
on 22 Aug, 2011 13:58
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has anyone else ever stuck a 1.5 yellow dotter on their 1.6? i just stuck one on my car this weekend, it seems to run a bit smoother and it has a more broad power band, like after 3k it really tugs, i haven't increased fueling yet either. just wondering what everyone elses experiences with them were. as far as timing yellow dot pumps are supposed to be set to 1.1-1.2 i believe, and i don't have a gauge so mine is set to where it drove best
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#1
by
R.O.R-2.0
on 22 Aug, 2011 14:04
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has anyone else ever stuck a 1.5 yellow dotter on their 1.6? i just stuck one on my car this weekend, it seems to run a bit smoother and it has a more broad power band, like after 3k it really tugs, i haven't increased fueling yet either. just wondering what everyone elses experiences with them were. as far as timing yellow dot pumps are supposed to be set to 1.1-1.2 i believe, and i don't have a gauge so mine is set to where it drove best
you set timing based on injectors.. so i would say that its the advanced timing giving you more power..
the YELLOW DOT pumps were coupled with 180bar injectors.. thats why they had such a high timing spec, from the high break pressures.
if you have 135, or 155bar injectors, timed to 1.2mm, then yea, the timing is way advanced, and thats where you gained power from..
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#2
by
RabbitJockey
on 22 Aug, 2011 16:16
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have u ever tried one?
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#3
by
R.O.R-2.0
on 22 Aug, 2011 16:27
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no, never personally used one, but i know the differences between a yellow dot pump and a normal pump. there almost identical inside.. im not even sure if there are any internal differences..
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#4
by
RabbitJockey
on 22 Aug, 2011 18:53
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i thought they have a very different timing curve and governor. it feels that way, like it pulls better and is more willing to rev up higher. but at the same time, my old pump could have just been worn out, and i time with my ear and my ass so i don't have any real numbers to compare. this pump is def better tho. i bought it off ebay a while ago just for the better 1.5 governor and springs, then my pump started leaking so i figured i'd try this one out.
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#5
by
theman53
on 22 Aug, 2011 19:02
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The 1.5 did have the fastest advance spring of all the VE vw pump IIRC. I have no clue what it has for a pump head. AND if you think EPA this is probably the farthest from EPA regulations as any pump out there.
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#6
by
RabbitJockey
on 22 Aug, 2011 19:13
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The 1.5 did have the fastest advance spring of all the VE vw pump IIRC. I have no clue what it has for a pump head. AND if you think EPA this is probably the farthest from EPA regulations as any pump out there.
that was another thought i had, it was the highest revving pump with least concern over emissions. nothing i have posted is scientific, i just wondered if anyone else has had similar results in a more accurate manner, as in they actually used a timing gauge and had a known good pump before hand
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#7
by
vanbcguy
on 23 Aug, 2011 00:26
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hagar had lots of good things to say about the yellow dot pumps. He was always looking for mileage but the fun thing with diesels is often something that gives you more power also results in better mileage...
I BELIEVE he said they had more advance, but I'm basing that on distant recollection.
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#8
by
R.O.R-2.0
on 23 Aug, 2011 11:07
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the housings are the same, but yes, i just checked, the advance spring is indeed softer. the roller cages and all the rest of the advance mechanism is the same tho.. so i would bet that they have more advance sooner.. but the same total timing advance..
they had the same pump top as a regular ol' n/a pump. well every one ive seen did..
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#9
by
RabbitJockey
on 24 Aug, 2011 09:03
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where is this info about 180 bar injectors coming from? i've seen it mentioned before but never anything solid, and i've never seen it in any books or parts supplier listings.
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#10
by
R.O.R-2.0
on 24 Aug, 2011 09:07
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where is this info about 180 bar injectors coming from? i've seen it mentioned before but never anything solid, and i've never seen it in any books or parts supplier listings.
dont even remember where i read it, but the earliest 1.5s with the yellow dot pumps, should have had 180 bar injectors.. and that was the reason for the high timing spec..
make sense?
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#11
by
Mark(The Miser)UK
on 24 Aug, 2011 10:49
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where is this info about 180 bar injectors coming from? i've seen it mentioned before but never anything solid, and i've never seen it in any books or parts supplier listings.
dont even remember where i read it, but the earliest 1.5s with the yellow dot pumps, should have had 180 bar injectors.. and that was the reason for the high timing spec..
make sense?
Although it would make sense at least for a standard pump, I think you simply misread a poorly printed 130 asbeing 180, or at least the PO of the quote you've read
Note it was not ther earliest pumps, but actually only occured during 1980 on some of the 107A pumps.
Several Bosch manuals refer to the yellow dot pump from this period and make the setting 1.1 to 1.2 operational limits with resetting to 1.15
The figures Hagar played with for internal pump pressures are of I believe a 107A pump. If it's a yellow dot I don't know, but the [corrected by me ] graph clearly shows a faster internal pressure to rpm rise than any other figures presented by punters, or indeed by the SAE graph of averages.
This steeper graph is easily obtained by the use of a stiffer spring at the vane pump relief valve, but alas doesn't explain why the pump needed to be advanced more. Advance spring may have been stiffer, but someone [oops who?] just posted otherwise.
All references to injector pressure from the same books refer to 120 to 142 bar ranges for the break pressures. More research needed I think
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#12
by
RabbitJockey
on 24 Aug, 2011 14:17
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the mystery of the yellow dot pump continues... its nice to clear up some of the fact from fiction here
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#13
by
R.O.R-2.0
on 25 Aug, 2011 11:37
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ive seen more than one place refer to the early 1.5L engines having 180 bar injectors..
im not crazy.. ive read it a few different times..
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#14
by
Mark(The Miser)UK
on 25 Aug, 2011 12:16
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ive seen more than one place refer to the early 1.5L engines having 180 bar injectors..
im not crazy.. ive read it a few different times..
Is it as factory or possibly someone's experiment?
IIRC only Google result that I get is here 
I'll retry