Well, three years to the day since I used the site, but I'm back!
Bit of advice required. Firstly, I didn't want to start a new thread unless completely necessary and secondarily I've Googled the information I'm trying to look for a hundred times and I still haven't come to a conclusive answer.
I'm running a Mk5 Gti with 292bhp and 287lbft. The list of mods is endless, but as of next week I'm having a whole load of work carried out on the old girl.
The list is as follows:
Clutch & DMF
Gearbox Oil Change
Engine Oil Change
Oil Filter
Fuel Filter
Spark Plugs
Cam Follower
ECS Subframe Spacer & Bolts
ITG Maxogen G60 (Upgrade)
4 x Goodyear Eagle F1 Asymmetric
N75 Valve
**RS4 Fuel Return Valve**
It is the last item on the list I'm most quizzical about. I run a KO3 turbo and stock HPFP and am wondering about the gains if any at all to be had by installing this and also whether or not the car would need to be mapped again to accommodate the mod, or whether or not my current map would just learn to adapt? My car has never had a problem coping or delivering the power, but occasionally I feel as though there's a slight flat spot around 5000-5500rpm. It has never shown on any dyno plots, so it could be psychosomatic. I do however, when the car is cold, notice a blip where there is a complete lack of power, it clears straight away, but it's very apparent, I could for instance completely depress the throttle and the car wouldn't go anywhere. So I figures for the sake of a £50 part and 30 mins labour, I thought it would be prudent to give it a bash.
I'd be grateful for any advice.
Many Thanks
Miles