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VW MKIV-A4 TDIs (VE and PD) This is a general discussion about A4/MkIV Jetta (99.5-~2005), Golf(99.5-2006), and New Beetle(98-2006). Both VE and PD engines are covered here.

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Old December 7th, 2017, 10:04   #31
jagster936
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Sounds interesting, subscribing
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Old December 7th, 2017, 19:57   #32
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Quote:
Originally Posted by ihredneck View Post
I'm no professional, but the 45 mg/str appears at the lower RPM's but at the 3000 RPM mark they are within spec of 40.0-42.0 mg/str.

Though a value that I believe is out of spec on block 008 is the IQ MAF Limit @ 3000 RPM. The log shows 32.8 mg/str and spec shows it should be 36.0-39.0 mg/str. Not sure how to interpret this though.
Ack! I missed the other spreadsheet pages! But, I still think that the requested fueling is higher than I have seen for stock: I have data from the son's Golf, which, at the time I gathered data, was a perfect runner, and I see a max of 41.8 mg/str.

"IQ MAF?"

Group 011 around 3k RPM it looks like you're losing boost. Sticking vanes or the N75 isn't responding correctly.

I just uploaded data from the son's car (Group 011) for reference.
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Old December 8th, 2017, 06:04   #33
ihredneck
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IQ MAF = Smoke Limitation (last column on block 008 data log)

Was the data log taken while in 3rd gear at WOT on your sons car?? Also, does his car have a tune or any mods?

I agree, the boost drops off around 3000 RPM.
I guess is could be sticky vanes, probably pull the down pipe off to check that, I had manually stroked the vanes, but I will check again.
Another thought is that it is under fueling around that RPM.

Also, I was looking at the time stamps vs RPM from your sons car and mine and I noticed that his went from 1900-3800 in about 4 seconds, mine got to 3800 in about 9 SECONDS....now I know it is a DOG! Again assuming your car data log was in 3rd gear.
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Last edited by ihredneck; December 8th, 2017 at 12:46.
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Old December 8th, 2017, 10:49   #34
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Saw some post where someone suggested oven cleaner to free sticky vanes.
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Old December 8th, 2017, 17:14   #35
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Quote:
Originally Posted by ihredneck View Post
IQ MAF = Smoke Limitation (last column on block 008 data log)

Was the data log taken while in 3rd gear at WOT on your sons car?? Also, does his car have a tune or any mods?

I agree, the boost drops off around 3000 RPM.
I guess is could be sticky vanes, probably pull the down pipe off to check that, I had manually stroked the vanes, but I will check again.
Another thought is that it is under fueling around that RPM.

Also, I was looking at the time stamps vs RPM from your sons car and mine and I noticed that his went from 1900-3800 in about 4 seconds, mine got to 3800 in about 9 SECONDS....now I know it is a DOG! Again assuming your car data log was in 3rd gear.
Yeah, if I was logging then it would have been 3rd gear. I'm guessing that it was a stock tune at the time: fueling is maxed around 37 mg/str (car now has a Stage 3 tune, with same T4 nozzles, in which case I figure fueling is now substantially higher); log of my car shows max fueling around 49 mg/str - Stage 2 tune with DLC520s.

Sticking vanes most likely. Wife's car had a sticky spot around 3k rpm and I kept working it for a good year before I manged to get it to smoothen out: I should get a log of her car- it's the strongest runner of the lot.
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Old Yesterday, 05:56   #36
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That would be interesting seeing logs of all the blocks on her car. Also, how could you tell the vanes were sticky around 3k besides pulling the exhaust and watching the movement of the vanes?

I do plan do check them out once I get back from a work trip.
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Old Yesterday, 22:59   #37
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Quote:
Originally Posted by ihredneck View Post
That would be interesting seeing logs of all the blocks on her car. Also, how could you tell the vanes were sticky around 3k besides pulling the exhaust and watching the movement of the vanes?

I do plan do check them out once I get back from a work trip.
Performance-wise everything was great, on the wife's car, except that there was a lull around the 3,000 rpm mark, kind of like it was running out of fuel, flat-lining and then pulling back out of it and resorting to full boost/power. I'd cleaned the intake, EGR and intake ports in the head, so all was clean there.

Here's a graph of what the wife's car was like (I should look around and see if I have one since things have been working well). It didn't feel as dramatic as it looks, though for sure it had a pronounced drop-off. Again, this is NOT what a properly running engine should look like! (I'm pretty sure this is a VNT15 in this car, though I have never looked- ha ha, I'd thought that it had a DMF in it only to find out when I went to replace the clutch that it had an SMF! - why service records are a nice thing to have!)

https://log.malonetuning.com/chart/3...gsKWwo0AAAA%3D
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