Arin@APR
GOLFMK7 Official Sponsor
The car I just tested is an early model as well.
6
The Official K04 Club (Experiences and Troubleshooting)
- Thread starter grambles423
- Start date
The car I just tested is an early model as well.
allset
Go Kart Champion
crap.
chrisisnapping
Go Kart Champion
what if it's not the software?
Your test car, Allset, Hyde, and Grambles all had APR k04, APR software, carbonio, and with the exception of Allset, the APR downpipe. So they all had very similar hardware and software, except your test car didn't have the APR intercooler, or any aftermarket intercooler like the other 3 cars did.
Given that all things are equal except the intercooler, could the intercooler perhaps play a role in this? too much air? pressure change? I'm not too familiar with the physics behind an intercooler, so again this is more of me asking a question as opposed to making an accusation.
(again not trying to say the APR intercooler is the cause, i'm sure other people who have experienced the surging/oscillation have had intercoolers like the s3 too)
Arin@APR
GOLFMK7 Official Sponsor
Good question and really good theory, but check this out:
So I'm still scratching my head. What you're saying could make sense, but if that was the case, Id be surprised we didn't see it before. I'll get an IC installed on the car we have here anyways. Can't hurt and I'm sure the owner will be happy. ; )
mdhollis
Go Kart Champion
This shit is impossible to troubleshoot without the car. People search the forum for a solution for their problem. Then hear someone describe something similar and start calling it the problem. The crazy thing is not everyone gets it, I know I didn't with APR software, oscillation that is.
Bcon
Ready to race!
Arin,
Thanks for the discussion.
I don't have a boost gauge, so I didn't "see" fluctuation, I "feel" it. It's wasn't faint either, it was blatantly obvious to anyone in the car.
Here's the condition: Take off from a stop in D and hold the throttle steady at 1/3 to 1/2. As the rpm goes through the 2k-3.5K range it surges/lurches like crazy. Car shifts, rpms drop, cycle repeats. Only happens when the car is fully warm, no surging at all until its completely warmed up. Switch programs and it goes away for a day or two, then returns.
Surging was less pronounced in 91 vs 93, but still very noticeable. No boost leaks, no codes, ever.
Car: 2012DSG CBFA
This was with the following mods: APR K04 (installed a the BBQ in Oct), APR downpipe, R8 coil packs, and PFR7B plugs gapped at 0.028, stock air box, stock intercooler, stock cat back.
As I mentioned, last week I installed the APR intercooler and the surging is 90 plus percent gone and hasn't worsened over the last week. The car is a joy now.
I also had cold start misfires and these haven't happened for the last week.
I still get a hesitation when hitting full throttle, but it's not that bad. Occasionally before if I hit full throttle on the interstate at about 4k rpm the car would hesitate, surge, then go into limp mode. I haven't been able to repeat that this week. It still hesitates, but it recovers and then pulls hard.
I would have loved to have it at your shop to show you, but it's a heck of a long way. I'd run logs for you, but it's pointless now it it's not happening.
I was never upset about the situation, I just considered them annoyances and the nature of the beast.
I have absolutely no idea why an intercooler changed this in my specific case, but I'm not complaining. I didn't do the intercooler swap attempting to fix the surging, it was just a very welcome side effect.
Thanks for the discussion.
I don't have a boost gauge, so I didn't "see" fluctuation, I "feel" it. It's wasn't faint either, it was blatantly obvious to anyone in the car.
Here's the condition: Take off from a stop in D and hold the throttle steady at 1/3 to 1/2. As the rpm goes through the 2k-3.5K range it surges/lurches like crazy. Car shifts, rpms drop, cycle repeats. Only happens when the car is fully warm, no surging at all until its completely warmed up. Switch programs and it goes away for a day or two, then returns.
Surging was less pronounced in 91 vs 93, but still very noticeable. No boost leaks, no codes, ever.
Car: 2012DSG CBFA
This was with the following mods: APR K04 (installed a the BBQ in Oct), APR downpipe, R8 coil packs, and PFR7B plugs gapped at 0.028, stock air box, stock intercooler, stock cat back.
As I mentioned, last week I installed the APR intercooler and the surging is 90 plus percent gone and hasn't worsened over the last week. The car is a joy now.
I also had cold start misfires and these haven't happened for the last week.
I still get a hesitation when hitting full throttle, but it's not that bad. Occasionally before if I hit full throttle on the interstate at about 4k rpm the car would hesitate, surge, then go into limp mode. I haven't been able to repeat that this week. It still hesitates, but it recovers and then pulls hard.
I would have loved to have it at your shop to show you, but it's a heck of a long way. I'd run logs for you, but it's pointless now it it's not happening.
I was never upset about the situation, I just considered them annoyances and the nature of the beast.
I have absolutely no idea why an intercooler changed this in my specific case, but I'm not complaining. I didn't do the intercooler swap attempting to fix the surging, it was just a very welcome side effect.
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I might have asked this before but is a long third gears pull supposed to sound like a flock of pigeons?
Sometimes it flutters something fierce. Sometimes it's just a smooth whooshing noise. I feel like when it flutters it doesn't pull as hard. I cannot reproduce that fluttering every time though.
Sometimes it flutters something fierce. Sometimes it's just a smooth whooshing noise. I feel like when it flutters it doesn't pull as hard. I cannot reproduce that fluttering every time though.
Bcon
Ready to race!
I've come to accept and adore the K04 pigeons. I've even named them - Sid and Nancy ( since they're crazy and unpredictable).
A_Bowers
Moderator
I approve of this message
reillyse
Go Kart Champion
This is EXACTLY what my car does. My theory is that this issue affects mostly us DSG people.
allset
Go Kart Champion
mine did sorta the same at the top of gears, i described it as hesitation but it hesitated in sysnc with the boost actuation sounds and needle movements
grambles423
Automotive Engineer
Moved some of the K04 issues to this thread