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catbed
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« on: February 20, 2014, 05:27:19 PM »
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Trying to diagnose what's causing my car to occasionally stall when I'm cruising then press the clutch. The engine will sometimes catch itself after dipping below idle.
It will also happen sometimes when I start from a stop and slip the clutch while feathering the gas, and push the clutch back in.
I'll post the logs when I get home and am around my computer. Car is CH box 1.8t BT, A-box MAF, EV14 1000cc injectors
EDIT: First log is a stall after cruise, and second log is when the engine catches itself.
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« Last Edit: February 20, 2014, 06:26:48 PM by catbed »
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catbed
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« Reply #1 on: February 20, 2014, 06:27:23 PM »
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logs attached to first post.
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overspeed
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« Reply #2 on: February 21, 2014, 05:58:59 AM »
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Are you using ligth flywheel ?
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userpike
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« Reply #3 on: February 21, 2014, 10:15:58 AM »
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Are you using ligth flywheel ?
I'm running a 7.5lb flywheel and never had a stall out like he's explaining. |
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userpike
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« Reply #4 on: February 21, 2014, 10:29:40 AM »
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how old is your timing belt? This is definitely a symptom of a worn 1.8t timing belt.
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catbed
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« Reply #5 on: February 21, 2014, 06:56:26 PM »
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Clutch masters 19 lb flywheel. Timing belt is like 10-15k miles old
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vdubnation
Turboman
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« Reply #6 on: February 21, 2014, 07:25:35 PM »
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seen this with vacuum leaks also out of curiosity whats your turbo inlet pipe look like
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catbed
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« Reply #7 on: February 21, 2014, 09:27:03 PM »
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seen this with vacuum leaks also out of curiosity whats your turbo inlet pipe look like
99% its not vacuum related as I replaced all the lines with silicone ones. Also worth pointing out, the MAFless version of this file does not have this problem. TIP is a 3 in stainless turn down to the A-box MAF with an AEM dryflow on the end. Don't think it leaks as the fuel trims are 2.8% at idle and .8% partial. |
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vdubnation
Turboman
Global Moderator
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« Reply #8 on: February 21, 2014, 09:37:12 PM »
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wow one of my buddys has a gt28 in 2001 a4 018ch with a 3" stainless and tip and it
stalls same way only way it wont stall is maf is unplugged
i m wondering if the distance of the maf from the turbo makes a differnce
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overspeed
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« Reply #9 on: February 22, 2014, 06:33:55 PM »
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I'm running a 7.5lb flywheel and never had a stall out like he's explaining.
I had issues with am extra ligth flywheel, solved modifying torque reserve and some refinement in TUVB, TEMIN and FKKVS, but car has stroker 2.0 with 11:1 Cr E100, 1.000cc and GTX3071R. |
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overspeed
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« Reply #10 on: February 22, 2014, 06:37:24 PM »
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wow one of my buddys has a gt28 in 2001 a4 018ch with a 3" stainless and tip and it
stalls same way only way it wont stall is maf is unplugged
i m wondering if the distance of the maf from the turbo makes a differnce
Yes, it make a huge diference... put MAF away from turbo... other thing is BLow-Off valve that didn´t close quickly (stuck and close slowly) |
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catbed
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« Reply #11 on: February 22, 2014, 11:20:14 PM »
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Yes, it make a huge diference... put MAF away from turbo... other thing is BLow-Off valve that didn´t close quickly (stuck and close slowly)
MAF is about as far away from the turbo as possible. DV is stock recirculated into TIP right at turbo inlet. |
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overspeed
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« Reply #12 on: February 23, 2014, 07:36:32 AM »
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If you have no mechanical issues, the logical asnwer is injectors and/or MAF calibration...
revise all maps related (TUVB, TEMIN, FKKVS, KRKTE, etc.)
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catbed
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« Reply #13 on: February 23, 2014, 10:51:33 AM »
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If you have no mechanical issues, the logical asnwer is injectors and/or MAF calibration...
revise all maps related (TUVB, TEMIN, FKKVS, KRKTE, etc.)
Exactly what I was thinking. TVUB and krkte are fine I believe as fuel trims are within 3%. FKKVS is all 1s and TEMIN is .387. I increased idle torque reserve to see if that helps. Flashing today |
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phila_dot
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« Reply #14 on: February 23, 2014, 11:56:27 AM »
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How did the problem manifest?
Tuning is not the solution to all problems.
What is the thought process behind increasing idle torque reserve?
What is the minimum injection time for those injectors?
What is te and ti when the car stalls?
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