fluttering sound

[wps]

hi all,
newbie here. i've just done a k04 upgrade on my DSG 07 GTI. using oem ed30 turbo, s3 injectors & intercooler, milltek TBE, autotech FP, rep carbonio intake with k&n drop in filter with APR k04 remap. car is performing well however i feel that the power delivery is not smooth. i get fluttering sound from my turbo between 3.5k to 4k rpm (esp on 3/4/5/6 gear). the boost (i've a boost meter installed) between 3.5 to 4k rpm doesn't seem to be holding fimrly too. feels like the car is not getting enough fuel. this problem was more obvious previously before upgrading to autotech fuel pump. could it be my intake? or fuel pump not supplying enough fuel? however, after 4.5k rpm the car pulls very smoothly till redline. i hope i can get some advise. thanks

[Top Cat]

Hi and welcome in WPS, i cant help you but thats a very interesting thread youv'e just started there.
VRSTU and DJhorace are our resident fuel pump expert's get yourself 10 or more post's and you will beable to PM them. 

[bobotheclown]

oooh the OP has got me wondering, can you simply bolt on a K04 turbo to a standard GTI engine and get the same power as an Ed30 or would you need to upgrade other components?

[SteveP]

oooh the OP has got me wondering, can you simply bolt on a K04 turbo to a standard GTI engine and get the same power as an Ed30 or would you need to upgrade other components?

Don't believe it's a straight bolt on job.

JKM do a K04 upgrade pack see here http://www.jkm.org.uk/performance/jkmtfsi-K04-upgrade.htm

[wps]

Hi and welcome in WPS, i cant help you but thats a very interesting thread youv'e just started there.
VRSTU and DJhorace are our resident fuel pump expert's get yourself 10 or more post's and you will beable to PM them. 

thanks top cat. will do

[Teutonic_Tamer]

wps - welcome to the forum.

You say you get good power all the way to the red line - does it feel as though it's making "good power" upto the red line, and even in the higher gears?  If it is, then you don't have a fueling issue, and can rule out any fuel pump probs!

I would strongly suspect the ECU map is the problem - is the APR map an "out of the box" map, or has it been fine tuned and customised on a RR?

[joesgti]

hey wps...respect for all the mods  how much has all that set you back, also what kind of power/torque are you getting 

[wps]

hey wps...respect for all the mods  how much has all that set you back, also what kind of power/torque are you getting 

spend alot, dont ask getting around 275whp and 400nm wtorque. however, power delivery is not linear enough to my liking. facing some low end lag and not smooth power delivery between 3.5k and 4k rpm. awesome from 4.5k to redline

[sixpot]

The fluttering sound is probably due to the turbo stalling (not good) and I would check the dump valve (not sure of correct terminology on the mk 5) is operating properly under the increased boost pressure. I had a similar problem in my old LCR, when we were trying to set up the Forge split-R valve.
If the dump valve fitted is aftermarket then the problem will probably lie elsewhere.
Of course I might be completely wrong, but its worth a quick check.

[gazbutmk5gti]

Is the APR map the HPFP specific map, if not the map you have may not be requesting the fuel to go with the extra boost in the midrange, could be talking out of my @rse