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Author Topic: drop in power until 3000rpm, FINALLY FIXED BY STATLLERS!!!!  (Read 22066 times)

Offline heavyd

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drop in power until 3000rpm, FINALLY FIXED BY STATLLERS!!!!
« on: June 30, 2012, 04:45:05 pm »
Hello folks, I noticed ,y car felt a bit sluggish this week, so popped into PDtuning for some advice :wink:He advised some datalogging, which I did, and found that for some reason, it isnt getting near peak boost until another 700rpm in the rev range, which explains why it feels sluggish at lower rpm.
Has anyone any ideas as to what could be causing this? Surely cant just be the heat? I've swapped the DV over to a one I had in the shed, which gave the same results. also MAF values look a lot different also
Heres 2 logs, first one is from the other month, last one is from today, both running same revo settings





« Last Edit: August 08, 2012, 03:27:41 pm by heavyd »
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Offline PDT

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Re: drop in boost, any ideas?
« Reply #1 on: June 30, 2012, 05:25:12 pm »
its not making requested load, look at the difference in the load column, its huge. I will look over the logs you emailed and report back......
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Offline heavyd

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Re: drop in boost, any ideas?
« Reply #2 on: June 30, 2012, 05:36:00 pm »
Quote from: PDT on June 30, 2012, 05:25:12 pm
its not making requested load, look at the difference in the load column, its huge. I will look over the logs you emailed and report back......

Thanks Dave :happy2:

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Offline chungster

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Re: drop in boost, any ideas?
« Reply #3 on: June 30, 2012, 11:06:39 pm »
MAF might be the cause I reckon ......it's not reading as high as last month at same rev points - hence engine loading gets affected and you're not getting full boost
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Offline heavyd

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Re: drop in boost, any ideas?
« Reply #4 on: July 01, 2012, 06:10:59 am »
I've already swapped the MAF over :sad1:
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Offline martziniuk

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Re: drop in boost, any ideas?
« Reply #5 on: July 02, 2012, 05:50:54 pm »
Oh poo 1.7 bar!
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Offline heavyd

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Re: drop in boost, any ideas?
« Reply #6 on: July 02, 2012, 06:29:40 pm »
its the boost before 3000rpm I was on about.
car is sluggish as hell until 3k rpm. backfires when revved when sitting at idle. couldnt catch a 1.5dci qashqai today from a standing start :scared:
Looks like I'm back to square one again, no fault codes showing at all either
Booked in at PDT on wednesday. Lets see he can even the tally with R-Tech for the title of 'saviour of the MK5golfgti forum'  :notworthy:
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Offline PDT

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Re: drop in boost until 3000rpm, any ideas?
« Reply #7 on: July 02, 2012, 07:54:35 pm »
Sounds like a challenge  :signLOL:
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Offline Andy

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Re: drop in boost until 3000rpm, any ideas?
« Reply #8 on: July 02, 2012, 07:59:51 pm »
Got every Faith in you Dave :notworthy:
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Offline heavyd

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Re: drop in boost until 3000rpm, any ideas?
« Reply #9 on: July 02, 2012, 08:20:27 pm »
Quote from: PDT on July 02, 2012, 07:54:35 pm
Sounds like a challenge  :signLOL:

No doubt it will be  :surprised:

Quote from: maxitrol on July 02, 2012, 07:59:51 pm
Got every Faith in you Dave :notworthy:

Is your car all done now Andy ?
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Offline Andy

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Re: drop in boost until 3000rpm, any ideas?
« Reply #10 on: July 02, 2012, 08:25:06 pm »
It's all done mate,but the modding side of it thou :signLOL:went to see Darron and had his hybrid turbo fitted,saving up for the clutch now to get the best out of the turbo
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Offline vRSAlex

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Re: drop in boost until 3000rpm, any ideas?
« Reply #11 on: July 02, 2012, 10:21:15 pm »
How come the requested boost levels are loads different between the two logs?  It's also cutting throttle back.

What's the timing pull like?
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Offline heavyd

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Re: drop in boost until 3000rpm, any ideas?
« Reply #12 on: July 03, 2012, 06:12:52 am »
not very good compared to what it was

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Offline PDT

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Re: drop in boost until 3000rpm, any ideas?
« Reply #13 on: July 04, 2012, 05:44:10 pm »
A quick update just incase anyone else has a similar issue in future. The car was in with us today and we physically and visually checked:

Front PCV
Rear PCV
Intake manifold flaps (including adaption restet)
In tank fuel pump (including adaption restet)
Throttle valve (including adaption restet)
AFM
Throttle pedal
Load values
Lambda adations
Boost pipes
Lambda sensors

Then we stripped the cam cover and timing belt cover off, checked that the belt and chain were all timed correctly and that the cams were correctly aligned.

None of which helped, all was ok. Noticed that the ignition advance at idle would occasionally jump by 10/15 degrees followed by a hesitation in idle speed and a rich idle mixture, this would open the throttle drive plate slightly to correct the values.

Next step is to change the crank and cam sensors, see if the helps. It all points to a badly fitted timing belt, same symptoms as we have seen many times before, so unless the bottom crank pulley has slipped my hope is its the crank sensor.
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Offline heavyd

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Re: drop in boost until 3000rpm, any ideas?
« Reply #14 on: July 04, 2012, 06:07:51 pm »

Thanks Dave :happy2:

Quote from: PDT on July 02, 2012, 07:54:35 pm
Sounds like a challenge  :signLOL:

Seems like you were right Dave :sad1: :sad1:
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