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Author Topic: decreased fuel economy with apr HPFP?  (Read 3588 times)

Offline chopper

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decreased fuel economy with apr HPFP?
« on: March 27, 2012, 09:34:50 pm »
has anyone with APR HPFP noticed decreased fuel economy issues?
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Offline vRS Carl

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Re: decreased fuel economy with apr HPFP?
« Reply #1 on: March 27, 2012, 09:35:23 pm »
I never when i had mine.
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Offline Hedge

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Re: decreased fuel economy with apr HPFP?
« Reply #2 on: March 27, 2012, 09:36:17 pm »
No.
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Offline chopper

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Re: decreased fuel economy with apr HPFP?
« Reply #3 on: March 27, 2012, 09:37:36 pm »
could it be a mapping issue? currently stage 2 superchips bluefin, but looking to change at weekend to remap by local company called torquetronix
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Offline Top Cat

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Re: decreased fuel economy with apr HPFP?
« Reply #4 on: March 27, 2012, 09:39:45 pm »
Mine dropped after fitting HPFP.  :happy2: car ran perfect still.
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Offline Hedge

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Re: decreased fuel economy with apr HPFP?
« Reply #5 on: March 27, 2012, 09:41:24 pm »
Quote from: chopper on March 27, 2012, 09:37:36 pm
could it be a mapping issue? currently stage 2 superchips bluefin, but looking to change at weekend to remap by local company called torquetronix

Keep us posted.  :happy2:
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Offline 56OctyVRS

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Re: decreased fuel economy with apr HPFP?
« Reply #6 on: March 28, 2012, 02:15:39 pm »
My mpg dropped very slightly when i fitted an uprated hpfp. I simply put it down to the pump now being able to meet the requested rail pressure and pumping through more fuel.
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Offline rich83

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Re: decreased fuel economy with apr HPFP?
« Reply #7 on: March 28, 2012, 03:24:27 pm »
You fitted an APR HPFP.... And you are concerned about MPG???

LOL
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Offline Thor

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Re: decreased fuel economy with apr HPFP?
« Reply #8 on: March 28, 2012, 03:37:44 pm »
Quote from: richwig83 on March 28, 2012, 03:24:27 pm
You fitted an APR HPFP.... And you are concerned about MPG???

LOL

I just brimmed the tank with V power as it was on vapours and and £1.50 a litre i guess you need to enjoy every drop  :driver:   :grin:
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Offline Hedge

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Re: decreased fuel economy with apr HPFP?
« Reply #9 on: March 28, 2012, 05:18:26 pm »
It shouldn't affect mpg as the map will only ever request 110bar at most. The fact the pump can supply more doesn't mean it has to.

Has the level on your dipstick risen and does your oil stink of petrol?  :scared:
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Offline dan930

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Re: decreased fuel economy with apr HPFP?
« Reply #10 on: March 28, 2012, 05:20:59 pm »
Quote from: Hedge on March 28, 2012, 05:18:26 pm
It shouldn't affect mpg as the map will only ever request 110bar at most. The fact the pump can supply more doesn't mean it has to.

Has the level on your dipstick risen and does your oil stink of petrol?  :scared:

+2 on this
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Offline Kregiel

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Re: decreased fuel economy with apr HPFP?
« Reply #11 on: March 28, 2012, 05:21:55 pm »
Apparently for me after going K04 the car is most economical comapred to stage 1, stage 2 and stage 2+....

Don't really know how to explain it

 :surprised:
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Red 2008 GTI, H&R ARB, b12 suspension, walk, milltek non-res full exhaust, forge IC, tarox 10 pot big brake kit, RS4 valve, Forge SSK, Autotech HPFP, Xenons, K04 Turbo, Quaife LSD, South Bend stage 3 Daily with SMF clutch, XB and UB Unibraces

Offline Hedge

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Re: decreased fuel economy with apr HPFP?
« Reply #12 on: March 28, 2012, 05:24:20 pm »
Probably because you spend more time off boost as the K04 spools later.
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Offline Kregiel

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Re: decreased fuel economy with apr HPFP?
« Reply #13 on: March 28, 2012, 09:56:26 pm »
that's must be it! My morning drive to work is 15 miles on motorway and always take it easy as engine cold and plenty of traffic... Keep it at 100-120 km/h and today saw a average figure I haven't seen since gti ownership 6.6l/100km which is 42 mpg, usually with K03 was lucky to see anything below 8l, best 7.8l/100 km.

However K04 compared to K03 seems laggy.... For example when cruising on 6th gear at 90 km/h at ca 2k revs I could step on it and the car smoothly accelerated. With K04 the car is not as smooth and kinda begs for downshift....

However up from 3.5 revs it's animal!
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Red 2008 GTI, H&R ARB, b12 suspension, walk, milltek non-res full exhaust, forge IC, tarox 10 pot big brake kit, RS4 valve, Forge SSK, Autotech HPFP, Xenons, K04 Turbo, Quaife LSD, South Bend stage 3 Daily with SMF clutch, XB and UB Unibraces

Offline chopper

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Re: decreased fuel economy with apr HPFP?
« Reply #14 on: March 28, 2012, 09:57:18 pm »
the hpfp only fitted 2 days ago. im wondering is the superchips remap asking for more fuel than is necessary, and now the pump can supply it, its burning up more fuel. i did have problems with black smoke on the superchips remap and guessed it was chucking unburnt fuel out.
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