GolfGTIforum.co.uk
Model specific boards => Golf mk4 => Golf mk4 TDI => Topic started by: mrapoc on 29 December 2011, 17:28
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Got my hands on the kit. Could someone have a quick look at results. Been having rubbish mpg! Testing blocks 3, 8 and 11.
I can provide the excel data if needed, but to make it nice - i've tried to make some graphs that may be useful. I don't really know what I'm looking for so I've used what I think might be useful.
edit: Graphs are in post below as these were not very useful
Temperatures after all the testing:
Fuel Temp Fuel cooling state Intake Air Temp Coolant Temp
~Amb.Temp.°C On:100%-Off:0% ~Amb.Temp.°C ~Amb.Temp.°C
°C % °C °C
55.8 0 34.2 76.5
55.8 0 34.2 76.5
55.8 0 34.2 76.5
55.8 0 34.2 76.5
55.8 0 34.2 76.5
55.8 0 34.2 76.5
55.8 0 34.2 76.5
55.8 0 34.2 76.5
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To get accurate data you need to do a WOT (Wide Open Throttle) in 3rd gear from as low down as you can to near enough red line.
On the data front am not much use but Rhyso, Topher, Nick (R-tech) or one of the chiptunning guys will be able to help
Be worth putting a post in the garage section as well.
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As Steve said, WOT in 3rd from approx 1500rpm to the redline and repeat at least 3 times to build up an accurate picture
You actual figures should near enough match the figures specified by the ECU :nerd:
You'll see low down that the boost will not match the requested as the turbo is spooling up; once up and running your boost and MAF levels should be hitting the requests of the ECU
Crap MPG normally points to a failing MAF
What engine is it?
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To get accurate data you need to do a WOT (Wide Open Throttle) in 3rd gear from as low down as you can to near enough red line.
On the data front am not much use but Rhyso, Topher, Nick (R-tech) or one of the chiptunning guys will be able to help
Be worth putting a post in the garage section as well.
So to do the WOT in 3rd, just a nice flat bit of road where I can go from 1.5k up to red line recording the same data I have above?
As Steve said, WOT in 3rd from approx 1500rpm to the redline and repeat at least 3 times to build up an accurate picture
You actual figures should near enough match the figures specified by the ECU :nerd:
You'll see low down that the boost will not match the requested as the turbo is spooling up; once up and running your boost and MAF levels should be hitting the requests of the ECU
Crap MPG normally points to a failing MAF
What engine is it?
Ok ill go measure the same blocks/data only this time repeat it a few times in 3rd, on flat land up to red line.
Its a Golf IV GTTDI 1.9 AJM 115.
Just to clarify..I do this on flat roads in 3rd? I remember reading it needs to be a hill or does it not matter.
Thanks very much
Oh and blocks 3, 8 and 11 correct?
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yep flat roads and as Rhyso said try to do it 3 times to get some good data.
think its 3 for maf, 11 for boost not sure what 8 is
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Here's the goods. I had to stop and turn around inbetween goes but I went up to the limit and started at about 1.5k.
(http://i2.sqi.sh/s_3/cvS/l_final1.jpg)
(http://i2.sqi.sh/s_3/cvS/l_final2.jpg)
(http://i2.sqi.sh/s_3/cvS/l_final3.jpg)
Cheers
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Does the MAF readings look dodgy? If so i can go order one today.
thanks guys
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Also, do I see my turbo overboosting?
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yes your turbo is overboosting but it will always over boost a little.
I would have thought your maf reading look ok as they hit the targets but wait for someone with more experiance to make a comment :lipsrsealed:
What engine is it?
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Golf IV GTTDI 1.9 AJM 115
In the meantime i'm going to repipe my vacuum lines. They look crap
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Can you put one run into a graph rather than all 3 into one graph as its a little hard to decipher :undecided:
Your turbo will over boost for a fraction and then it is brought back into line; if it over boosts for too long you'll hit limp mode
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I've logged another run in 4th from 30mph to redline. Ill stick that up shortly
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Group A: '003 Group B: '008 Group C: '011
Engine speed MAF (specified) MAF (actual) EGR duty cycle Engine speed IQ driver's req IQ via rpm(Torq) IQ via MAF Engine speed Spec. intake press. Actual intake press. D.cycle MAP
TIME 820-900 230-420 230-420 10-95% TIME 2850-3150 50-55 44-47 47-52 TIME 2850-3150 2000-2150 2000-2200 40-95%
Marker STAMP /min mg/str mg/str % STAMP /min mg/str mg/str mg/str STAMP /min mbar mbar %
1.15 1260 850 445.9 4.8 0.35 1281 36.8 42.8 17.8 0.75 1239 1683 1101.6 20.3
2.34 1323 850 490 4.8 1.55 1281 59.8 42.8 27.5 1.96 1302 1734 1275 19.9
3.54 1407 850 519.4 4.8 2.74 1344 59.8 43.4 29.1 3.14 1386 1815.6 1377 21.5
4.74 1491 850 578.2 4.8 3.94 1428 59.8 44.2 30.5 4.34 1470 1917.6 1519.8 23.5
5.94 1617 850 646.8 4.8 5.14 1533 59.8 45.6 34.6 5.54 1575 2040 1693.2 27.9
7.14 1764 850 769.3 4.8 6.34 1659 59.8 48.6 40.1 6.74 1701 2142 1938 43.8
8.34 1932 850 965.3 4.8 7.54 1827 59.6 50.8 48 7.94 1869 2142 2264.4 63.4
9.54 2121 850 1127 4.8 8.74 1995 58.2 50.2 54.1 9.14 2058 2142 2539.8 82.9
10.74 2310 850 931 4.8 9.93 2163 56.5 49.4 53.8 10.34 2226 2142 2478.6 90.4
11.94 2478 850 788.9 4.8 11.14 2373 55.2 48.9 49.7 11.54 2415 2142 2009.4 81.3
13.14 2625 850 774.2 4.8 12.34 2520 53.8 48 43.1 12.74 2562 2142 1907.4 72.9
14.34 2772 850 891.8 4.8 13.54 2667 52.7 47.2 45 13.94 2730 2142 2080.8 76.9
15.54 2919 850 926.1 4.8 14.74 2835 51.9 46.1 50 15.14 2877 2142 2193 80.5
16.74 3066 850 911.4 4.8 15.94 2982 50.8 45.6 48.9 16.34 3024 2142 2213.4 82.9
17.94 3192 850 931 4.8 17.14 3108 50 45.3 48.3 17.54 3150 2142 2254.2 87.7
19.14 3318 850 960.4 4.8 18.34 3234 48.9 45.3 48 18.73 3276 2142 2295 94
20.34 3423 850 945.7 4.8 19.54 3360 48 44.7 47.5 19.94 3402 2142 2295 94.4
21.54 3528 850 940.8 4.8 20.74 3465 47.2 44.2 46.9 21.14 3486 2142 2284.8 94.4
22.74 3612 850 916.3 4.8 21.93 3549 46.7 43.6 46.7 22.34 3591 2142 2274.6 94.4
23.94 3696 850 931 4.8 23.14 3633 46.1 43.1 46.7 23.54 3675 2142 2274.6 94.4
25.14 3759 850 931 4.8 24.34 3717 45.6 42.5 46.4 24.74 3738 2142 2264.4 94.4
26.34 3822 850 916.3 4.8 25.54 3780 45 42.3 46.4 25.94 3801 2142 2254.2 94.4
27.52 3885 850 911.4 4.8 26.74 3843 44.7 42.3 46.1 27.14 3864 2142 2264.4 94.4
28.74 3948 850 940.8 4.8 27.94 3906 44.2 42.5 46.1 28.34 3927 2142 2274.6 94.4
29.94 4011 850 931 4.8 29.14 3969 43.9 42.5 46.1 29.54 3990 2142 2284.8 94.4
31.14 4053 850 926.1 4.8 30.34 4032 43.4 42.8 45.8 30.74 4032 2142 2295 94.4
32.34 4116 850 906.5 4.8 31.54 4095 43.1 41.5 45.3 31.94 4095 2142 2284.8 94.4
33.54 4158 850 901.6 4.8 32.74 4137 42.8 40.6 45 33.14 4158 2142 2284.8 94.4
34.74 4200 850 911.4 4.8 33.94 4179 42.3 39.5 44.5 34.34 4200 2142 2284.8 94.4
35.94 4263 850 896.7 4.8 35.12 4221 42 38.4 43.9 35.52 4242 2142 2274.6 94.4
37.14 4284 850 862.4 4.8 36.32 4263 41.7 37.6 43.6 36.72 4284 2142 2264.4 94
38.34 4326 850 857.5 4.8 37.54 4305 41.5 37.1 43.1 37.94 4326 2142 2254.2 94.4
39.52 4368 850 837.9 4.8 38.74 4347 41.2 36.2 42.5 39.14 4347 2142 2244 94.4
40.72 4389 850 833 4.8 39.92 4389 40.9 35.7 42 40.32 4389 2142 2233.8 94.4
41.92 4431 850 828.1 4.8 41.12 4410 40.9 35.1 41.7 41.52 4410 2142 2223.6 94.4
43.19 4452 850 828.1 4.8 42.35 4431 40.6 34.3 41.2 42.77 4452 2142 2213.4 94
44.4 4473 850 813.4 4.8 43.6 4473 40.4 34 40.4 44 4473 2142 2203.2 94.4
45.6 4494 850 798.7 4.8 44.8 4494 40.4 33.5 40.1 45.2 4494 2142 2193 94.4
46.8 4536 850 808.5 4.8 46 4515 40.1 33.2 40.1 46.4 4515 2142 2182.8 94.4
Want a graph?
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Yeah or just past the info relating to the MAF
My first thoughts are your MAF is screwed - if you look at time stamp 11.94 and 13.14 you can see how the values are well below the requested when they should be around their peak. they then climb back up again.
The numbers themselves are really erratic too
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(http://i2.sqi.sh/s_3/cB4/l_4th.png)
Checked out my MAF. Is it aftermarket? Its an SMP Europe MAF. Also the airbox...looks very different to my mate's. If so, I can go to TPS tomorrow and pick up the correct ones
(http://i2.sqi.sh/s_3/cB2/s_img_20120103_192559.jpg) (http://"http://i2.sqi.sh/s_3/cB2/l_img_20120103_192559.jpg")
(http://i2.sqi.sh/s_3/cB1/s_img_20120103_192642.jpg) (http://"http://i2.sqi.sh/s_3/cB1/l_img_20120103_192642.jpg")
(http://i2.sqi.sh/s_3/cB1/s_img_20120103_192624.jpg) (http://"http://i2.sqi.sh/s_3/cB1/l_img_20120103_192624.jpg")
(http://i2.sqi.sh/s_3/cB1/s_img_20120103_192559.jpg) (http://"http://i2.sqi.sh/s_3/cB1/l_img_20120103_192559.jpg")
(http://i2.sqi.sh/s_3/cB1/l_img_20120103_192605.jpg)
(http://i2.sqi.sh/s_3/cB1/s_img_20120103_192616.jpg) (http://"http://i2.sqi.sh/s_3/cB1/l_img_20120103_192616.jpg")
(http://i2.sqi.sh/s_3/cB1/s_img_20120103_192551.jpg) (http://"http://i2.sqi.sh/s_3/cB1/l_img_20120103_192551.jpg")
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Changed the MAF. Not sure if its improved the MPG yet but it picks up a lot better!
(http://i2.sqi.sh/s_3/cBC/l_wow.png)
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That's looks 10 times better than your previous graph :smiley:
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Yeh it feels 10x better too in the low revs. I used to have quite a lot of lag when pulling away until the turbo kicked in...i thought that was normal :P
Seems that the "SMP maf sensor" isnt as good as a proper VW one. I got it for £65 inc housing/tubing from TPS (inc vat!) bargain!
In terms of this thread and my MAF - both are solved...for now
Thanks all