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JP_Turbo
Trainee


Joined: 27 Jan 2015
Posts: 56
Location: London


PostPosted: Fri Aug 11, 2017 10:11 am    Post subject: Fuel Consumption - 997.1 Turbo Reply with quote

Hi Guys,

I know I will probably get burnt with comments about "oh you bought a turbo why are you worrying about the MPG" But coming from a 6.2 V8 C63 AMG and an A45 AMG I am quiet confused to how poor the economy is around town in the Turbo.

I am (with reseting the trip on the PCM) getting roughly 12.0 MPG around town (central London) on short journeys. Sometimes even less.

I have a Tiptronic S

Is this normal? This is not even reaching mid way on the boost gauge on a sprint?

My tyre pressure is at 34 psi on the front and 37 psi (in cold) on the rears. The car has been serviced in the last 4000 or so miles. No problems with her what so ever...

Thanks in Advance

Last edited by JP_Turbo on Fri Aug 11, 2017 11:35 am; edited 2 times in total
 
  
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Easto
Silverstone


Joined: 18 Jul 2017
Posts: 145



PostPosted: Fri Aug 11, 2017 10:27 am    Post subject: Reply with quote

I've had 3 weeks in mine...
I get around 15-18 round town
28-32 on motorway

My old RS6 was a touch worse and the GTR same round town but only mid 20's on mway

Gen 2 pdk
 
  
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JP_Turbo
Trainee


Joined: 27 Jan 2015
Posts: 56
Location: London


PostPosted: Fri Aug 11, 2017 10:39 am    Post subject: Reply with quote

Easto wrote:
I've had 3 weeks in mine...
I get around 15-18 round town
28-32 on motorway

My old RS6 was a touch worse and the GTR same round town but only mid 20's on mway

Gen 2 pdk


I've had mine 3 weeks. And honestly put around £350 petrol in the tank. Its more of an annoyance than anything.

Mine is Gen 1 though I have read that the PDK box is slightly better on consumption
 
  
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TBE997
Trainee


Joined: 19 Mar 2017
Posts: 81
Location: London


PostPosted: Fri Aug 11, 2017 11:14 am    Post subject: Reply with quote

I have a 997.1 C2S and I get usually around 12-14mpg in central London, and around 23-25 once I am on the motorway, my current average is around 16mpg

I think on shorter trips, particular a lot of stop and go, mpg drops simply because you are not moving a lot while the engine is running (if that makes sense)
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DaveH911
Montreal


Joined: 24 Jan 2014
Posts: 600
Location: Derby

2006 Porsche 997 Turbo

PostPosted: Fri Aug 11, 2017 11:17 am    Post subject: Reply with quote

From memory, I think the pressures should be 2.3 bar front/ 2.7 bar rear. I would say your tyre pressures are a little soft.
My mpg before being mapped was somewhere around the 21mpg mark town driving, with 28mpg motorway.
Since being mapped, I now get 26mpg around town and 32 ish motorway.
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987.2 Cayman Manual
996 Carrera C4S - Arctic Silver - Sold
987 Boxster - Atlas Grey - Sold
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Bikeracer1098
Österreich


Joined: 28 Mar 2015
Posts: 898
Location: Camberley, Surrey


PostPosted: Fri Aug 11, 2017 11:26 am    Post subject: Reply with quote

C63_2_4S wrote:
Easto wrote:
I've had 3 weeks in mine...
I get around 15-18 round town
28-32 on motorway

My old RS6 was a touch worse and the GTR same round town but only mid 20's on mway

Gen 2 pdk


I've had mine 3 weeks. And honestly put around £350 petrol in the tank. Its more of an annoyance than anything.

Mine is Gen 1 though I have read that the PDK box is slightly better on consumption


How many miles have you done in the past 3 weeks? 12MPG does sound low, unless your racing between traffic lights.....lol

997.2 turbos 20% more efficient due to DFI engine
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JP_Turbo
Trainee


Joined: 27 Jan 2015
Posts: 56
Location: London


PostPosted: Fri Aug 11, 2017 11:32 am    Post subject: Reply with quote

Bikeracer1098 wrote:
C63_2_4S wrote:
Easto wrote:
I've had 3 weeks in mine...
I get around 15-18 round town
28-32 on motorway

My old RS6 was a touch worse and the GTR same round town but only mid 20's on mway

Gen 2 pdk


I've had mine 3 weeks. And honestly put around £350 petrol in the tank. Its more of an annoyance than anything.

Mine is Gen 1 though I have read that the PDK box is slightly better on consumption


How many miles have you done in the past 3 weeks? 12MPG does sound low, unless your racing between traffic lights.....lol

997.2 turbos 20% more efficient due to DFI engine


Currently 600 miles.

260 of them were on the motorway drive home when I picked her up...
 
  
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rabbitstew
Nürburgring


Joined: 21 Aug 2015
Posts: 460



PostPosted: Fri Aug 11, 2017 11:40 am    Post subject: Reply with quote

I use mine as a daily. Over 18,000 miles since May 2016 and mine averages 27.5mpg on my daily commute. Thats basically a couple of miles driving out of my town, then a bendy B road for around 20 miles or so where if its clear I can give it some stick. Then its another 10 or 15 miles of cruising at between 30 and 60 depending upon traffic.

I actually drove to Newcastle and back the other day which was a 500 mile round trip and it averaged 30mpg which was pretty much just cruising all the way there at 85/90.

Mines a manual though and I pretty much only ever fill up with Tesco 99.
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2000 Ducati 996
1999 Yamaha R1
1994 Kawasaki ZXR750L2
 
  
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Bikeracer1098
Österreich


Joined: 28 Mar 2015
Posts: 898
Location: Camberley, Surrey


PostPosted: Fri Aug 11, 2017 11:41 am    Post subject: Reply with quote

C63_2_4S wrote:
Bikeracer1098 wrote:
C63_2_4S wrote:
Easto wrote:
I've had 3 weeks in mine...
I get around 15-18 round town
28-32 on motorway

My old RS6 was a touch worse and the GTR same round town but only mid 20's on mway

Gen 2 pdk


I've had mine 3 weeks. And honestly put around £350 petrol in the tank. Its more of an annoyance than anything.

Mine is Gen 1 though I have read that the PDK box is slightly better on consumption


How many miles have you done in the past 3 weeks? 12MPG does sound low, unless your racing between traffic lights.....lol

997.2 turbos 20% more efficient due to DFI engine


Currently 600 miles.

260 of them were on the motorway drive home when I picked her up...


That's roughly £0.58 pence per mile, averaging around 11MPG over the 600miles.

The turbo should be running in fresh air compared with the C63.

Something's nit right, need to get it checked over, it sounds like more than just the tyre pressures.

What MPG were you getting from the C63?

Been pissed off with my new M4 competition pack only averaging 22MPG commuting to work, used to get better economy out of my E46 M3 while being ragged along the some AMG mercs. Managed 27MPG and 32MPG while cruising on the motorway, even though the official figures quote 34MPG
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Last edited by Bikeracer1098 on Fri Aug 11, 2017 11:47 am; edited 1 time in total
 
  
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JP_Turbo
Trainee


Joined: 27 Jan 2015
Posts: 56
Location: London


PostPosted: Fri Aug 11, 2017 11:45 am    Post subject: Reply with quote

Bikeracer1098 wrote:
C63_2_4S wrote:
Bikeracer1098 wrote:
C63_2_4S wrote:
Easto wrote:
I've had 3 weeks in mine...
I get around 15-18 round town
28-32 on motorway

My old RS6 was a touch worse and the GTR same round town but only mid 20's on mway

Gen 2 pdk


I've had mine 3 weeks. And honestly put around £350 petrol in the tank. Its more of an annoyance than anything.

Mine is Gen 1 though I have read that the PDK box is slightly better on consumption


How many miles have you done in the past 3 weeks? 12MPG does sound low, unless your racing between traffic lights.....lol

997.2 turbos 20% more efficient due to DFI engine


Currently 600 miles.

260 of them were on the motorway drive home when I picked her up...


That's roughly £0.58 pence per mile, averaging around 11MPG over the 600miles.

The turbo should be running in fresh air compared with the C63.

Something's nit right, need to get it checked over, it sounds like more than just the tyre pressures.

Is it manual or tip?


Its a Tip. I thought so or I just have a heavy foot... Very Happy

I had the car checled out at Ninemiesters in Warrington before I bought it and nothing was flagged up about anything running rich or hindering the engine/turbo's Confused

I was geting around 9.8MPG with the C63 (IIRC) It was around 2 years ago so I could be wrong...
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Last edited by JP_Turbo on Fri Aug 11, 2017 11:51 am; edited 1 time in total
 
  
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Bikeracer1098
Österreich


Joined: 28 Mar 2015
Posts: 898
Location: Camberley, Surrey


PostPosted: Fri Aug 11, 2017 11:49 am    Post subject: Reply with quote

May be worth calling Ken at 9e for a chat, he's got a wealth of knowledge on these engines and the problematic areas such as boost leaks etc which may have an impact on economy.
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Aprilia RSV4 RF
 
  
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JP_Turbo
Trainee


Joined: 27 Jan 2015
Posts: 56
Location: London


PostPosted: Fri Aug 11, 2017 12:00 pm    Post subject: Reply with quote

Bikeracer1098 wrote:
May be worth calling Ken at 9e for a chat, he's got a wealth of knowledge on these engines and the problematic areas such as boost leaks etc which may have an impact on economy.


Will do. Do you mean Nine Excellence?
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Bikeracer1098
Österreich


Joined: 28 Mar 2015
Posts: 898
Location: Camberley, Surrey


PostPosted: Fri Aug 11, 2017 12:09 pm    Post subject: Reply with quote

C63_2_4S wrote:
Bikeracer1098 wrote:
May be worth calling Ken at 9e for a chat, he's got a wealth of knowledge on these engines and the problematic areas such as boost leaks etc which may have an impact on economy.


Will do. Do you mean Nine Excellence?


Yes Thumb
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Aprilia RSV4 RF
 
  
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lofi
Suzuka


Joined: 08 Jun 2009
Posts: 1248
Location: Surrey/Kent border

2001 Porsche 996 Turbo

PostPosted: Fri Aug 11, 2017 12:10 pm    Post subject: Reply with quote

He does.
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ex 944 2.5 manual
ex 964 C4 manual
 
  
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graemeho
Nürburgring


Joined: 16 Jan 2012
Posts: 393
Location: Lincolnshire


PostPosted: Fri Aug 11, 2017 5:01 pm    Post subject: Reply with quote

Mpg does sound low. When I first got mine it was stubbornly on 19mpg , rising to 22 if driven carefully. At the time I thought this was just how they are. About a month later CEL flashed up, lambda aged fault on no.2 bank. I changed both (post cat) and it's now 27 average, 31 if driven steady. Check your lambdas
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Equivocator
Newbie


Joined: 24 Jun 2017
Posts: 4



PostPosted: Fri Aug 11, 2017 10:54 pm    Post subject: Reply with quote

Had mine a couple of months now- I'm getting 15-18 on short journeys and had a (light footed) 25 last week on a longer trek with some motorway.

It's worse than I thought it was going to be, but the grin makes up for it!
 
  
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RJW1881
Monza


Joined: 10 Aug 2015
Posts: 242
Location: Holbeach

2007 Porsche 997 Turbo

PostPosted: Sat Aug 12, 2017 5:01 am    Post subject: Reply with quote

I get 18mpg out of my 997.1 turbo (tyre pressure 28psi front 32psi rear).. I thought that was pretty good for the performance offered. I used to get similar mpg from my RS4 & GT-R.

I've just done a 3000 mile road trip to Bosnia (and back) in my supercharged VXR8 which averaged 12mpg! The 100 octane fuel in Italy at €2 a litre was a nice treat!

I only get 32mpg out of my daily diesel Discovery!

I wouldn't worry about your mpg, as long as your enjoying the car.
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Buell XB12-carbon/ exhaust/ remap/ lowered
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T8
General
General


Joined: 29 Jun 2010
Posts: 12964
Location: Kent


PostPosted: Sat Aug 12, 2017 6:40 am    Post subject: Re: Fuel Consumption - 997.1 Turbo Reply with quote

C63_2_4S wrote:


I know I will probably get burnt with comments about "oh you bought a turbo why are you worrying about the MPG" ......... I am (with reseting the trip on the PCM) getting roughly 12.0 MPG around town (central London) on short journeys. Sometimes even less.

I have a Tiptronic S

Is this normal? This is not even reaching mid way on the boost gauge on a sprint?



No one should flame you for any queries about fuel consumption if you feel that something is wrong although I'd personally query why you bought a 473 bhp car for so much town usage.

I can't say whether 12 mpg is extraordinarily low for such use but it does seem so given that when I first got my car I spent the first few weeks hooning it as much as possible and never got below 17.

Since then in 15k miles my car has averaged 22.33 mpg and the only time it went below 20 was in the forests of Germany.

Mine is also a Tiptronic S - driven 50/50 in 'M' and 'D' - and has done a lot of motorway/autobahn cruising but even if I used it more on UK B roads I'd be disappointed with less than 20 mpg overall as that is what my 996T achieved over 11k miles.

Most importantly, if your car is only boosting to half the gauge when being driven hard there is definitely something wrong. If you get that sorted out I think you'll be impressed with both the performance improvement and the mpg.

Good Luck.
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ex 2004 Polar Silver 996T Tiptronic
ex 2002 Seal Grey 996.2 C4 Tiptronic
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vlad
Hockenheim


Joined: 16 Aug 2006
Posts: 725



PostPosted: Sat Aug 12, 2017 6:56 am    Post subject: Reply with quote

Had similar issue 14.5mpg not seeing max boost - turned out to be seized turbo acctuator
 
  
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JP_Turbo
Trainee


Joined: 27 Jan 2015
Posts: 56
Location: London


PostPosted: Mon Aug 14, 2017 8:32 am    Post subject: Reply with quote

graemeho wrote:
Mpg does sound low. When I first got mine it was stubbornly on 19mpg , rising to 22 if driven carefully. At the time I thought this was just how they are. About a month later CEL flashed up, lambda aged fault on no.2 bank. I changed both (post cat) and it's now 27 average, 31 if driven steady. Check your lambdas


Thanks will do. This sounds like it could be the case....Will get the car on the diagnostics.
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