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#1
April 9th 2011, 16:16
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  Now get that fuel problem fixed and make a 450 run 
__________________
If some is good and more is better, then too much should be just about right! 
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#3
April 9th 2011, 20:35
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Doing great Walter
Ah, Hi Walter
 , at what point will you be happy? Now don't get mad Walter, I'm in your corner. Is this engine a test bed/mule engine that can or ment to be sacrificed? I'd really like to see you just loving what you have done, thus the name Mythbuster. Enjoy your ride, nice work.
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#4
April 11th 2011, 01:11
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Considering that you do all the work yourself with little or no "professional" help the results and ghe evolution process of this engine earns the highest respect imho. Keep up the great work Wally! One way to find out if your wiring is too small would be to measure the amperage at the pump during a dyno run.If the amps are low (due to the wire being too small) the pump would run too slow.The specs of the pump i.e. on the box or papers should show how many amps the pump pulls.You should have that as a minimum value.
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#5
April 11th 2011, 03:27
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Not too much credits to me pls Mark, give them to the type 4 engine instead
The 044 pump alone can pull 15A and the low pressure Carter feed pump probably between 5 and 10A as well. I just had time yesterday to change the wiring to much bigger (3x) and put and extra relais in the trunk next to the battery, feed straight from battery plus its own fuse. Short test drive revealed the same low fuel pressure (from 3,5 bar to 2,5 bar FP) on boost instead of rising with boost... not good still. Tested FPR again and with air pressure from the air compressor, fuel pressure rose nicely while engine was idling. So the FPR-rising-rate works, it just doesn' t kick in for some reason. My remaining thought is that the boost reference line for the FPR is not giving it boost. I have that boost reference line Tee'd from a line where it also feeds the boost control relais. Since that one is now circulating with the top and bottom port of the external gate, maybe the boost reference line looses pressure when waste-gate kicks in(?). At least thats my latest thought, so I have changed the T to another location and hope to test it somewhere this week...
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#6
April 11th 2011, 06:12
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Quote:
Also, you didn't have this problem before at higher boost levels.Maybe your alternator is too weak to support the increased load that the pump and injectors are demanding? Just an idea, but I think the problem is actually elsewhere.Does your ECU control the fuel pump also? Is it possible that you may need a larger or an additional feed pump?
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#7
April 11th 2011, 13:04
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Runs:
http://www.youtube.com/watch?v=97SNAq1e9gY and warm-up on dyno (turbo whistle): http://www.youtube.com/watch?v=IfBpkJnZgbc Last edited by Wally; April 11th 2011 at 13:22.
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#8
April 11th 2011, 14:31
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Boost senitive regualtor
Walter, you are running a boost senitive fuel regulator arn't you? Is you fuel system looped? I have seen boost senitive regulators in a looped fuel system where the fulel pump pumps the same pressure all of the time, as boost demand are needed. It is the responsibility of the regulator to up fuel pressure. Amp and wire size can come into play if the pump is worn and tired, thus the need for more amps. Can you ECM log fuel pressuee and you not at what boost pressure?
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#9
April 13th 2011, 04:39
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Glad to hear you found the problem, Wally.Will you modify the catch tank and continue to use it or is there no need for it?
I'm exited now what you pull on the dyno - then again I might get jealous 
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#10
April 13th 2011, 05:36
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Quote:
I hope to run one or two Time Attack events, but those are only 20 minutes track time, so I might just be ok for now till end of season? We'll see. Quote:
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#11
April 13th 2011, 15:09
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What fuel pressure sensor and gauge do you have?
When I was having miss fires under load I needed to check fuel pressure. My only option at the time was a long hose from rear to front, and a gauge taped to the windshield. That is a bit unnerving! s
__________________
Steve Arndt
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#12
April 13th 2011, 15:30
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Quote:
 . In hindsight the 0-10 bar would have been more appropiate, but I haven't run out of range yet. Unfortunately...DTA has already the VDO sensor's calibrations as stock in the ecu, amongst many other press. sensors and I just have to click the right one and it knows what and how to measure.
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#14
April 18th 2011, 18:57
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Hi,
I keep following your post as sort of a dream that I'll never go for (doesn't fit my usage of my beetle) but still, I'm impressed. About the Fuel pressure, I run a CB Quicktune kit on my 2007 engine and I also have issues with the fuel pressure that I don't understand. All I know from the logs is that fuel pressure (3bar / 45psi) at idle tends to drop quickly after the engine has been running for a few minutes. I get the feeling the fuel pressure regulator aren't all that reliable but I have no certainty. I have done some testing, it has nothing to do with angle of the FPR or temperature, it just happens... Maybe you could try changing the FPR and see if it solves your problem. Seb
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#15
April 19th 2011, 03:29
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Maybe the feed line from the tank to the pump is too small? If there´s not enough volume,you won´t be able to hold the required pressure.
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