MK5 Golf GTI

All Things Mk5 => Modifications & Technical Area => Performance Modifications => Topic started by: seanieb on October 23, 2017, 08:50:18 pm

Title: Decat to standard system?
Post by: seanieb on October 23, 2017, 08:50:18 pm
Is a full system really needed or would just the highflow downpipe fitted to standard system get the same results after remap?
Title: Re: Decat to standard system?
Post by: rich83 on October 23, 2017, 09:26:35 pm
It depends on what results you are after.
Title: Re: Decat to standard system?
Post by: seanieb on October 24, 2017, 06:32:03 am
I know standard stage 1s tend to make around 240-250hp so would a downpipe and cai make 15-20 more?
Title: Re: Decat to standard system?
Post by: rich83 on October 24, 2017, 07:31:54 am
It has the potential too but you’ll run out of fuel between 250-260 so you would probably need an upgraded fuel pump (and upgraded intercooler and intake) if 270bhp is your target
Title: Re: Decat to standard system?
Post by: Paradox1 on October 24, 2017, 10:08:11 am
It has the potential too but you’ll run out of fuel between 250-260 so you would probably need an upgraded fuel pump (and upgraded intercooler and intake) if 270bhp is your target

off topic, what calipers are those in your sig?
Title: Re: Decat to standard system?
Post by: rich83 on October 25, 2017, 01:29:44 pm
DB9. Same as TTRS
Title: Re: Decat to standard system?
Post by: AJP on October 25, 2017, 03:29:09 pm
It has the potential too but you’ll run out of fuel between 250-260 so you would probably need an upgraded fuel pump (and upgraded intercooler and intake) if 270bhp is your target
X2

Mine made 270 on the R-Tech rollers, just with a full BCS exhaust and Pipercross panel filter. But it put the standard fuel pump right on the limit - fuel cuts were just round the corner. Loba pump sorted that and also made it a much nicer car in terms of power delivery.

Bottom line - if you want a strong and reliable 270bhp from a k03 TFSI, get an uprated pump.
Title: Re: Decat to standard system?
Post by: pudding on October 25, 2017, 03:47:00 pm
Same applies to the K04 engines.  The crazy midrange torque the TFSI engines are capable of is only possible with an uprated HPFP.