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Author Topic: Fixing a Flat Spot in the Rev Range  (Read 8791 times)

Offline RocketRossUK

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Fixing a Flat Spot in the Rev Range
« on: 27 August 2013, 09:07 »
Hey guys,

Just a quicky, just the other day i felt a big flat spot in 3rd while accelerating. It has been fine up till this point so i can rule the map out. It doesn't seem to happen all the time. Really need to take it on a full run with loads of 3rd and 4th gear pulls

Main thing i would check is DV, Coils, Plugs. Just dont which order is best to try. Obviously i should check Dv first, but my jack is broke at the minute, so cant just whip it up and check.

Has anyone else had a flat spot and changed any of the above with good results.

 
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Offline barrym381

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Re: Fixing a Flat Spot in the Rev Range
« Reply #1 on: 27 August 2013, 10:10 »
a jack to get to your dv  :undecided:
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Offline Poached

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Re: Fixing a Flat Spot in the Rev Range
« Reply #2 on: 27 August 2013, 10:19 »
Going to need VCDS or a logging session really as this could be a number of things.

What RPM is the flat spot?
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Offline Rhyso

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Re: Fixing a Flat Spot in the Rev Range
« Reply #3 on: 27 August 2013, 10:38 »
Quote from: barrym381 on 27 August 2013, 10:10
a jack to get to your dv  :undecided:

Its a MK6; its fitted at the back of the engine and underneath
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Marshy

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Re: Fixing a Flat Spot in the Rev Range
« Reply #4 on: 27 August 2013, 10:49 »
Ross I know you say its not the map but have you tried putting it back to standard to check?
Your bluefin aren't you? If so a quick easy check.
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Offline RocketRossUK

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Re: Fixing a Flat Spot in the Rev Range
« Reply #5 on: 27 August 2013, 11:10 »
Quote from: Marshy on 27 August 2013, 10:49
Ross I know you say its not the map but have you tried putting it back to standard to check?
Your bluefin aren't you? If so a quick easy check.

Its not map, it been pulling hard and fast for 2 months, wouldn't just change.

Its around 3000 revs. Im thinking it gonna be a teared DV, I remember when it happened on my MK5, think it did the same.

I have VCDs, what menu do you use to test boost / flatspots?
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MK6 GTI CSG | Revo Stage 2 | Revo Stage 2 Intake | Milltek 3" TB Exhaust | SuperPro Anti Lift Kit | H&R ARB's | Bilstein B12 | TT Short Shifter |Mintex M1144 Race Pads | HEL Braided Lines |

MK5 GTI - DSG + Extras (Sold because DSG was Soooo Boring !!!)

Offline Rhyso

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Re: Fixing a Flat Spot in the Rev Range
« Reply #6 on: 27 August 2013, 11:19 »
Engine module

Think boost is block 110 / 115

Or they start at block 10
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Offline RocketRossUK

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Re: Fixing a Flat Spot in the Rev Range
« Reply #7 on: 27 August 2013, 11:34 »
Quote from: Rhyso on 27 August 2013, 11:19
Engine module

Think boost is block 110 / 115

Or they start at block 10

Thanks for the reply. Then what do you do with it? does it show you fault or lack off boost etc...
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MK6 GTI CSG | Revo Stage 2 | Revo Stage 2 Intake | Milltek 3" TB Exhaust | SuperPro Anti Lift Kit | H&R ARB's | Bilstein B12 | TT Short Shifter |Mintex M1144 Race Pads | HEL Braided Lines |

MK5 GTI - DSG + Extras (Sold because DSG was Soooo Boring !!!)

Offline Poached

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Re: Fixing a Flat Spot in the Rev Range
« Reply #8 on: 27 August 2013, 12:23 »
Firstly see if you have any faults stored in the ecu memory.

Then you could measure boost pressure requested vs actual boost pressure produced with N75% (Wastegate).

There are many variables you can measure in VCDS. You are probably best exporting the data to excel and producing a graph to see what's happening or taking it to a tuner with a dyno to test in a controlled environment.
« Last Edit: 27 August 2013, 12:25 by Poached »
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Offline Rhyso

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Re: Fixing a Flat Spot in the Rev Range
« Reply #9 on: 27 August 2013, 12:46 »
As per Poache's reply  :smiley:

It will give you specified VS actual values so you will see if you are losing boost  :nerd:
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