Fuel Pumps

[TrickGTI]

Hi all
im wanting to change the hi-pressure fuel pump on my car to an APR one as iv read many reviews on them and they seem to be by far the best, but the one question no one mentions is that if i was to fit it and iv no re-map on my car as its higher pressure coming out the fuel pump would this effect the running?? it should but im not sure... its just im adding these modifications as im going along with cash flow but dont wanna fit it if its going to make the car run like a bag of spanners and once its all fitted map it to whats on... is this right ? sorry if im coming across really dumb now im just mechanically minded not very good with the technical side...

[bacillus]

The apr pump will be of no benefit on a stock car.
If you go for it, keep it till you remap the car before installing it.

[TrickGTI]

hey yea i understand that untill the car is mapped then most the modifications wont have any real effect i was just buying them in any order will proberly leave it till last but still once its fitted i need to get it to where ever is maping it and dont want to run it if its going to do any damage...

[Hurdy]

It will not damage the car, the worst it will do is make your car run a little richer and therefore actually safer
The fuel pump only works to deliver fuel pressure requested by the ecu, so on an OEM set-up should behave like a normal pump anyway.

[johnford60]

Mine's mapped, so is it recommend to chnage this pump?

[Hurdy]

Mine's mapped, so is it recommend to chnage this pump?

Not necessarily.

Tuners make different maps for GTI's with fuel pumps and those without. Generally stage 2+ is the map that goes with a fuel pump, intake, exhaust and (sometimes) uprated intercooler. Some people suffer fuel cuts or power hesitation at higher rpm's when accellerating and an uprated fuel pump can help eliminate this. Also a car will make more power with a high pressure fuel pump fitted in conjunction with the right map.

[TrickGTI]

Thanks hurdy id sort of gathered you would be the one to answer this as yours might as well be a rocket on wheels  for now im hopeing to get the uprated intercooler, exhaust, fuel pump, dv and cold feed intake. will there be a set map for this like you have just said like the stage 2+ ill get up to speed with all this tech info eventually ha

[Hurdy]

Yes, there will be a generic map for the mods you mentioned. Some will still do customised codes and others will give you a base code with safe settings that you can alter yourself (only recommended if you know what is a safe setting and what isn't and you have VCDS). It is very much down to personal preference.

[TrickGTI]

aaaa right cool. One other thing is VCDS the Vag com softwear because my boss has just bought it for our workshop.

[Hurdy]

aaaa right cool. One other thing is VCDS the Vag com softwear because my boss has just bought it for our workshop.

Yes. 

If he has bought it for the workshop it maybe a commercial version with extended features