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Model specific boards => Golf mk4 => Topic started by: oceanic-green on 27 July 2012, 09:13

Title: Turbo lag
Post by: oceanic-green on 27 July 2012, 09:13
What can be the causes of turbo lag on a stage one remapped 1.8t. ?

Thanks
Title: Re: Turbo lag
Post by: pickles on 27 July 2012, 09:22
restrictive pipework maybe ?
Title: Re: Turbo lag
Post by: oceanic-green on 27 July 2012, 14:23
Quote from: pickles on 27 July 2012, 09:22
restrictive pipework maybe ?

not in my case,

There is a very noticeable turbo lag in mine. Can a broken actuator cause this to happen?
Title: Re: Turbo lag
Post by: Wazzzer on 27 July 2012, 18:39
Could be. The actuator needs to be strong enough to hold the wastegate shut until the desired boost is reached
Title: Re: Turbo lag
Post by: oceanic-green on 27 July 2012, 18:43
Quote from: Wazzzer on 27 July 2012, 18:39
Could be. The actuator needs to be strong enough to hold the wastegate shut until the desired boost is reached

Thanks, is there anyway I can test this?
Title: Re: Turbo lag
Post by: Chris. on 27 July 2012, 18:53
vagcom log the duty cycle.

What boost you pushing and when are you on full boost?
Title: Re: Turbo lag
Post by: oceanic-green on 27 July 2012, 19:01
Quote from: Chris. on 27 July 2012, 18:53
vagcom log the duty cycle.

What boost you pushing and when are you on full boost?

I am getting about 15 psi now, when I last looked.

What is the "duty cycle" ?

Thanks
Title: Re: Turbo lag
Post by: Chris. on 27 July 2012, 19:10
How hard the N75 valve is having to work to meet the boost as required by ecu.
Title: Re: Turbo lag
Post by: oceanic-green on 28 July 2012, 07:20
Quote from: Chris. on 27 July 2012, 19:10
How hard the N75 valve is having to work to meet the boost as required by ecu.

Thanks. I do have a spare N75, so I will try it. It is the original c one.

What block do I need to log for it

Thanks
Title: Re: Turbo lag
Post by: oceanic-green on 29 July 2012, 15:37
I have not had chance to do the logging yet, but I do notice a kind of flutter/flickering sound after the turbo whistle when I take my foot of the accelerator. What could this be?
Title: Re: Turbo lag
Post by: Wazzzer on 29 July 2012, 18:22
possibly DV sticking or split pipe to it
Title: Re: Turbo lag
Post by: oceanic-green on 29 July 2012, 21:19
Quote from: Wazzzer on 29 July 2012, 18:22
possibly DV sticking or split pipe to it

Ahh ok, thanks. There are no split pipes, but it does sound a little bit like the pipe has split, because this happened a while ago, and sounded similar.

What do I do to find out if it is sticking? If it is, can it be fixed. I have an Awesome Forge dv

thanks
Title: Re: Turbo lag
Post by: Wazzzer on 29 July 2012, 21:21
In the words of Groundskeeper Willy "Grease me up woman!!"
Title: Re: Turbo lag
Post by: oceanic-green on 29 July 2012, 21:32
Quote from: Wazzzer on 29 July 2012, 21:21
In the words of Groundskeeper Willy "Grease me up woman!!"

 :grin: :laugh:

Ok then, any particular grease a need to use, seriously I wouldn't have a clue what to use  :laugh:
Title: Re: Turbo lag
Post by: pickles on 30 July 2012, 11:32
http://www.forgemotorsport.co.uk/content.asp?inc=product&cat=0007&product=FMDVSK

all you need and reasonably priced
Title: Re: Turbo lag
Post by: oceanic-green on 30 July 2012, 12:22
Quote from: pickles on 30 July 2012, 11:32
http://www.forgemotorsport.co.uk/content.asp?inc=product&cat=0007&product=FMDVSK

all you need and reasonably priced

Nice one. Thank you  :smiley:
Title: Re: Turbo lag
Post by: oceanic-green on 30 July 2012, 12:23
If the DV is sticking, would that cause power/boost issues?
Title: Re: Turbo lag
Post by: Wazzzer on 30 July 2012, 12:33
if it was stuck open it would just bleed your boost off
Title: Re: Turbo lag
Post by: oceanic-green on 30 July 2012, 12:49
Quote from: Wazzzer on 30 July 2012, 12:33
if it was stuck open it would just bleed your boost off

If it was stuck open, is that what that fluttering sound would be, because there is no split pipe at all. because my car feels like it wants to go, but then doesn't

Thanks
Title: Re: Turbo lag
Post by: Dalo Harkin on 30 July 2012, 12:59
fluttering is normally the DV, but you can get very odd noises dependant on the filter setup
Title: Re: Turbo lag
Post by: oceanic-green on 30 July 2012, 13:11
Quote from: Dalo Harkin on 30 July 2012, 12:59
fluttering is normally the DV, but you can get very odd noises dependant on the filter setup

I am going to put the venom back on, as I did brake the sai hose clip, and had to tape it to the air box. may be that may have something to do with the fluttering then?