"lumpy" throttle response
Re: "lumpy" throttle response
Will be using vag.com (borrowed not owned) had a look on Rosstech and looks like adv meas blocks but as most on here already know I am about as technical as a one eyed monkey with a ball hammer
Re: "lumpy" throttle response
Yeah, measuring blocks and advanced measuring blocks are just 2 ways of looking at the same data. Log groups 1, 2 and 32 to start with (not advanced).
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
Re: "lumpy" throttle response
Right wiped codes and went for a blast - they did not come back, see below for pics of data at idle but i thought it looked ok....
Lambda control under log 1 ranged from 0 to -2.3 but usually matched and were manliy 0 to -1.6 I know this means it's reducing the fuel as its thinks it's running a little rich but was zeroing every second or so.
Any ideas?
Lambda control under log 1 ranged from 0 to -2.3 but usually matched and were manliy 0 to -1.6 I know this means it's reducing the fuel as its thinks it's running a little rich but was zeroing every second or so.
Any ideas?
Re: "lumpy" throttle response
Not telling us much as idle, that's the problem. It would have been useful to log the MAF values while driving, especially under WOT.
Problem is here that your mixture adaptation values are reading zero which suggests to me that the picture was taken just after clearing the DTCs which also zeros the adaptations. It won't calculate the partial until you drive for a bit. So we have no info about what your MAFs are doing at higher revs.
What you need to do is go out for a drive with the laptop plugged in (don't clear the DTCs this time) and use the log feature (you can see the button) to save the data to disk. Start it off logging then go for a short blast, getting up to the red line at least once under WOT.
Then do the same while logging these groups instead: 1, 54, 115.
Then find the .csv files generated and post them up here for me to peruse.
Problem is here that your mixture adaptation values are reading zero which suggests to me that the picture was taken just after clearing the DTCs which also zeros the adaptations. It won't calculate the partial until you drive for a bit. So we have no info about what your MAFs are doing at higher revs.
What you need to do is go out for a drive with the laptop plugged in (don't clear the DTCs this time) and use the log feature (you can see the button) to save the data to disk. Start it off logging then go for a short blast, getting up to the red line at least once under WOT.
Then do the same while logging these groups instead: 1, 54, 115.
Then find the .csv files generated and post them up here for me to peruse.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
Re: "lumpy" throttle response
Thanks Shop 
- I had driven about 20 or so miles and given it the beans since wiping codes - interestingly it did it again on the way home with the traction light flashing in sync with the stuttering revs - checked the codes again and still nothing....
Will try and pop out later and log some live data but now thinking the fault codes and stuttering under mid load may not be related.....
Ps maf's were running north of 3 before I took the car out for a hard drive and circa 3 when hot - I believe it depends on air density and temp a bit but should they still be 3+?
- I had driven about 20 or so miles and given it the beans since wiping codes - interestingly it did it again on the way home with the traction light flashing in sync with the stuttering revs - checked the codes again and still nothing.... Will try and pop out later and log some live data but now thinking the fault codes and stuttering under mid load may not be related.....
Ps maf's were running north of 3 before I took the car out for a hard drive and circa 3 when hot - I believe it depends on air density and temp a bit but should they still be 3+?
Re: "lumpy" throttle response
It might be a bad connection on the MAF. When I looked at imola_sid's his maf wire was completely fcuked but it wasn't throwing any codes.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
Re: "lumpy" throttle response
New maf's about 4k miles ago - did originally have crap readings but air box was not seated correctly. Is there a "correct" MAF range? Seem to thing it's 3-3.8?
Re: "lumpy" throttle response
Yeah, that's OK at idle, but under WOT you should be looking at about 200 each.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
Re: "lumpy" throttle response
I wonder if it's your N75 overboosting;
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
Re: "lumpy" throttle response
We'll find out when you log your boost.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
Re: "lumpy" throttle response
Right got a swanky new laptop (far too good for what I need it for) and my VCDS so going to have a crack tonight hopefully.
Quick question though, to log WOT do you have to hit the log button when at WOT or can you press the button then go for a quick sprint? Laptops pretty small and even in 2nd its pretty fast to be trying to faf around clicking tabs.
If not I will get a mate to help me I guess?
Quick question though, to log WOT do you have to hit the log button when at WOT or can you press the button then go for a quick sprint? Laptops pretty small and even in 2nd its pretty fast to be trying to faf around clicking tabs.
If not I will get a mate to help me I guess?
Re: "lumpy" throttle response
Nah, just start it logging before you start driving. I use the 'marker' button to mark interesting events, especially when using turbo which creates a lot of data to wade through.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
Re: "lumpy" throttle response
Here are a couple of short logs, was going through town and thought i was at WOT a few times but log say NO
Really hoping its not bad news car still pulls well but did have the lumpy throttle towards the end of the first log - dont hang me for not having the engine up to full temp on first log - did not have a lot of time.
Shop - if its bad please do sugar coat it. No fault codes loogged at all even after the run - i am not sure what i am looking at to be honest but lambdas look a little erratic
Fingers crossed
Really hoping its not bad news car still pulls well but did have the lumpy throttle towards the end of the first log - dont hang me for not having the engine up to full temp on first log - did not have a lot of time.
Shop - if its bad please do sugar coat it. No fault codes loogged at all even after the run - i am not sure what i am looking at to be honest but lambdas look a little erratic
Fingers crossed
- Attachments
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- LOG-01-001-002-032.xls
- (67.5 KiB) Downloaded 51 times
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- LOG-01-001-054-115.xls
- (120.5 KiB) Downloaded 49 times
Re: "lumpy" throttle response
OMG!
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
Re: "lumpy" throttle response
Just my little joke. 
Nothing is wildly wrong looking. MAF values look good. The partial mixture correction is quite negative which suggest that the car is leaking metered air. I'm thinking boost leak. Also the car is slow to make specified boost, which kinda backs that up.
Leaky intercoolers? Maybe a leaky boost pipe. Might be a good idea to change the N75 and DVs anyway if they hav'nt been done recently. A dodgy N75 might explain the slow boost and lumpy power curve. As could bad DVs. But neither would explain the negative lambdas, although -9 isn't a huge amount.
Might be worth you driving and logging groups 15, 16 and 17 also, to see if there are any misfires.
Nothing is wildly wrong looking. MAF values look good. The partial mixture correction is quite negative which suggest that the car is leaking metered air. I'm thinking boost leak. Also the car is slow to make specified boost, which kinda backs that up.
Leaky intercoolers? Maybe a leaky boost pipe. Might be a good idea to change the N75 and DVs anyway if they hav'nt been done recently. A dodgy N75 might explain the slow boost and lumpy power curve. As could bad DVs. But neither would explain the negative lambdas, although -9 isn't a huge amount.
Might be worth you driving and logging groups 15, 16 and 17 also, to see if there are any misfires.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
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