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Fuel Efficiency #1645548
27/10/2020 20:50
27/10/2020 20:50
Joined: Dec 2019
Posts: 141
Milton Keynes
KevinW Offline OP
Club Member 1862
KevinW  Offline OP
Club Member 1862
On a journey

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Posts: 141
Milton Keynes
Probably the only reason I don't use the coup for daily driving is the fuel efficiency. Are there any mods that can actually increase this without loss of driveability? Technology has moved on a bit since the 90's. I was thinking mire efficient turbo, improved ecu mapping or spark plugs etc? 20vt 1997.


KevinW
Milton Keynes UK
Re: Fuel Efficiency [Re: KevinW] #1645562
28/10/2020 12:19
28/10/2020 12:19
Joined: Dec 2005
Posts: 12,211
Sandhurst
Begbie Offline
Ex El Presidente
Begbie  Offline
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I AM a Coop

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Posts: 12,211
Sandhurst
Spark plugs doesn't really give you better fuel consumption, so best to leave alone. Turbo's have changed, but if you swapped the turbo, you would one that is more efficient and hold boost better, which then would require a remap to make the most of it for power and fuel consumption purposes, then you are on a slippery slope of modifying the car for even more power laugh


Originally Posted by Jonny - After being taken out at Spa
Your car is Usain Bolt with wellies
Re: Fuel Efficiency [Re: KevinW] #1645563
28/10/2020 12:57
28/10/2020 12:57
Joined: Sep 2010
Posts: 334
The Netherlands
J
jaaps2 Offline
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J

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The Netherlands
Recently the fuel became more expensive for me. Regular petrol in NL changed to E10, so now I need to use Shell V-power. So perhaps a mod so we can use 10% ethanol.

Best option would be to make your car lighter: no airco, carbon bonnet (bad for safety). Or put something under your gas pedal ...

Last edited by jaaps2; 28/10/2020 12:58.

20VT, build in 1997, first used in 1998
https://youtu.be/mI0jZIIBc2w
20VT6 plus, build in 1999
Re: Fuel Efficiency [Re: KevinW] #1645566
28/10/2020 13:25
28/10/2020 13:25
Joined: Dec 2005
Posts: 3,906
Pothole City
GrahamL Offline
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Pothole City
Run base boost by connecting the 2 lower pipes on the EBV together. Nothing else is going to make much difference, other than maybe some weight reduction as jaaps2 mentioned.

Re: Fuel Efficiency [Re: KevinW] #1645583
28/10/2020 19:29
28/10/2020 19:29
Joined: May 2018
Posts: 465
born in Italy I live in German...
carmine Offline
club member 1915
carmine  Offline
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Posts: 465
born in Italy I live in German...
I can tell you that after installing manual boost controller + increased intercooler + gtech phase 1 chip, my consumption has improved, about 600km with a full tank of fuel. mixed route.

Re: Fuel Efficiency [Re: carmine] #1645584
28/10/2020 19:58
28/10/2020 19:58
Joined: Dec 2019
Posts: 141
Milton Keynes
KevinW Offline OP
Club Member 1862
KevinW  Offline OP
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On a journey

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Posts: 141
Milton Keynes
Ok assuming 60l (tank is 63) that's around 28mpg. But I'm getting at least 31 at the moment!

Last edited by KevinW; 28/10/2020 19:59.

KevinW
Milton Keynes UK
Re: Fuel Efficiency [Re: KevinW] #1645586
28/10/2020 21:57
28/10/2020 21:57
Joined: Dec 2005
Posts: 95
Essex
1
1st_things_1st Offline
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Reaping the fruits
1

Joined: Dec 2005
Posts: 95
Essex
If you drive at 60mph average, I've seen 37 MPG. The only reason I did it was because I had to. laugh

I was with my brother, his car had an issue and he was taking it easy to get back.

Maintaining speed you should get better. Least braking or accelerating. Going round corners without braking. Takes some doing / planning I would expect, especially in normal traffic or around town.

Re: Fuel Efficiency [Re: 1st_things_1st] #1645602
29/10/2020 12:22
29/10/2020 12:22
Joined: Dec 2019
Posts: 141
Milton Keynes
KevinW Offline OP
Club Member 1862
KevinW  Offline OP
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Milton Keynes
OK but I was really talking about base fuel efficiency. Of course I can drive like a pensioner. I think the general answer is it cannot be improved significantly without significant compromise. No upgrades necessary then good!


KevinW
Milton Keynes UK
Re: Fuel Efficiency [Re: KevinW] #1645604
29/10/2020 13:08
29/10/2020 13:08
Joined: May 2018
Posts: 465
born in Italy I live in German...
carmine Offline
club member 1915
carmine  Offline
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Enjoying the ride

Joined: May 2018
Posts: 465
born in Italy I live in German...
hi, I can assure you that the driving we do is not as a retiree, let's face it, with a 20v turbo you can't drive like a retiree, but I have lowered consumption from 450km to about 570 km after these changes.

Re: Fuel Efficiency [Re: KevinW] #1645616
29/10/2020 16:19
29/10/2020 16:19
Joined: Dec 2019
Posts: 141
Milton Keynes
KevinW Offline OP
Club Member 1862
KevinW  Offline OP
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Posts: 141
Milton Keynes
Carmine...Ah OK. I have already got the gtec1. The other changes may be an option then thanks.


KevinW
Milton Keynes UK
Re: Fuel Efficiency [Re: KevinW] #1645626
29/10/2020 19:08
29/10/2020 19:08
Joined: Feb 2006
Posts: 197
Czech republic
Honza Offline
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Posts: 197
Czech republic
for better fuel efficiency I would go for higher CR and improved volumetric efficiency to get more power of boost.. no boost no added fuel smile

(= gasflowed head, straightened intake tract wilt lower loss piping/IC, more efficient turbo -even stock size, better intake cam.. on the other hand the same for exhaust - as much as possible freeflow) and properly mapped ECU... but I doubt that it could be improvements in liters per 100km ... but in normal use u can see some improvement.. and of course, u can see power increase.. but if its worth.. these mods arent cheap...


20 years with yellow 2.0 16v NA
22 years with black SEDICIVALVOLE

Re: Fuel Efficiency [Re: KevinW] #1645638
30/10/2020 00:39
30/10/2020 00:39
Joined: May 2018
Posts: 465
born in Italy I live in German...
carmine Offline
club member 1915
carmine  Offline
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Enjoying the ride

Joined: May 2018
Posts: 465
born in Italy I live in German...
Honza you are right, these mods are not cheap, but what do we not do for our coupes, by the way I forgot to add that I also have a 200 cell sports katalyst, I believe that the whole can bring a small difference in consumption, but we must also remember that coupes are always different from each other, even if they are the same they will always have different values ​​in everything, which would mean that even making these changes, maybe you will not consume less but maybe more.

Re: Fuel Efficiency [Re: KevinW] #1645646
30/10/2020 11:41
30/10/2020 11:41
Joined: Dec 2019
Posts: 141
Milton Keynes
KevinW Offline OP
Club Member 1862
KevinW  Offline OP
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Milton Keynes
OK let me just re-mortgage the house and I think I may be able to achieve some additional fuel efficiency smile Sounds fun though if you have these skills!


KevinW
Milton Keynes UK
Re: Fuel Efficiency [Re: KevinW] #1645667
31/10/2020 11:05
31/10/2020 11:05
Joined: Dec 2005
Posts: 3,439
S. Wales. Way beyond my means
Gripped Offline
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S. Wales. Way beyond my means
In terms of one single mod, wouldn't a live remap (to iron out any fuelling blips etc) on existing set up be sufficient to improve economy? So looking at around £250 ish. Will usually improve drivability too. Flea's your man assuming he's still doing it.

Sounds like your mpg is pretty good already, but should be possible to achieve a bit more.

It certainly helped with mine.



Last edited by Gripped; 31/10/2020 11:09.
Re: Fuel Efficiency [Re: KevinW] #1645696
01/11/2020 15:51
01/11/2020 15:51
Joined: Jul 2007
Posts: 497
S Wales
Morrison Offline
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S Wales
Got to agree with Gripped, go to someone who's knows what they're doing to get it live mapped, ask them for better fuel efficiency.

Gtec chip is great as a plug n play upgrade, but getting a live map is the best thing I ever did for all aspects of the drivability of mine, including mpg.

Re: Fuel Efficiency [Re: KevinW] #1645729
02/11/2020 14:33
02/11/2020 14:33
Joined: Dec 2019
Posts: 141
Milton Keynes
KevinW Offline OP
Club Member 1862
KevinW  Offline OP
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Posts: 141
Milton Keynes
Hi Morrison. Thanks - good advice. I was considering this.


KevinW
Milton Keynes UK
Re: Fuel Efficiency [Re: KevinW] #1645787
03/11/2020 21:33
03/11/2020 21:33
Joined: Dec 2005
Posts: 17,310
Staffordshire
Nigel Offline
Club Member 123
Nigel  Offline
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Joined: Dec 2005
Posts: 17,310
Staffordshire
I was faced with a similar dilemma in 2013 - I was doing over 25,000 miles a year in the Coupe and it was hurting the wallet.

TBH, anything above 30mpg is doing well in a 20vt. I once managed 43mpg in my Coupe over 375 miles, but it was painful. I also managed 28mpg fully loaded over 1,000 miles to France and back.

I bought another car for use as a daily driver (Alfa GT diesel) and used the Coupe on sunny weekends

I worked out it was cheaper to own two cars, with one capable of more than 50mpg - less wear and tear on the Coupe too


[Linked Image]
Re: Fuel Efficiency [Re: KevinW] #1645788
03/11/2020 22:44
03/11/2020 22:44
Joined: Dec 2005
Posts: 1,397
Kent
S
Submariner Offline
My job on the forum
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S

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Posts: 1,397
Kent
It is what it is...even with live mapping its not going to make much of a difference. The Coupe is not about frugal mpg motoring.

Re: Fuel Efficiency [Re: KevinW] #1645790
03/11/2020 22:51
03/11/2020 22:51
Joined: Mar 2019
Posts: 180
North Macedonia
386ka Online content
Club Member 1814
386ka  Online Content
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Posts: 180
North Macedonia
Just a question - how often do people get LPG conversions in the UK?

Re: Fuel Efficiency [Re: 386ka] #1645791
03/11/2020 23:19
03/11/2020 23:19
Joined: Feb 2017
Posts: 188
Tasmania
G
Grigio Offline
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Posts: 188
Tasmania
Originally Posted by 386ka
Just a question - how often do people get LPG conversions in the UK?


I don't know about the UK, but in Oz it used to be quite common, all the taxis used to be gas. I converted my 131, with the intention of supercharging it, but bought the coupe instead, and sold the 131. The cost of LPG has increased a lot, it's not a great deal cheaper than petrol here now, so I rarely see an LPG vehicle anymore.


2000 grigio moon 20VT Plus.
Re: Fuel Efficiency [Re: Grigio] #1645809
04/11/2020 18:33
04/11/2020 18:33
Joined: Sep 2010
Posts: 334
The Netherlands
J
jaaps2 Offline
Club Member 1560
jaaps2  Offline
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Making a profit
J

Joined: Sep 2010
Posts: 334
The Netherlands
8
Originally Posted by Grigio
Originally Posted by 386ka
Just a question - how often do people get LPG conversions in the UK?


I don't know about the UK, but in Oz it used to be quite common, all the taxis used to be gas. I converted my 131, with the intention of supercharging it, but bought the coupe instead, and sold the 131. The cost of LPG has increased a lot, it's not a great deal cheaper than petrol here now, so I rarely see an LPG vehicle anymore.


In NL it’s possible for the 1.8 and has been done.


20VT, build in 1997, first used in 1998
https://youtu.be/mI0jZIIBc2w
20VT6 plus, build in 1999
Re: Fuel Efficiency [Re: Gripped] #1646487
25/11/2020 13:03
25/11/2020 13:03
Joined: Sep 2007
Posts: 809
Behind Enemy Lines
Master_Mariner Offline
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Behind Enemy Lines
Originally Posted by Gripped
In terms of one single mod, wouldn't a live remap (to iron out any fuelling blips etc) on existing set up be sufficient to improve economy? So looking at around £250 ish. Will usually improve drivability too. Flea's your man assuming he's still doing it.

Sounds like your mpg is pretty good already, but should be possible to achieve a bit more.

It certainly helped with mine.





I took my stock 20vt6 to Mr Flea a couple of years ago after she had been saved by Countrycruising. He recommended flea-and told me that a good live map makes the coupe come alive. I've always been wary of "remapping" over the years. Read all the horror stories...but my mpg in the coupe with the taps open was quite dismal. So I went to Mr Flea.

He asked me how I wanted the car-and I suggested a "Fast GT Car. Good MPG. With good torque"

Watching a live re-map with someone who really loves the coupe, on a rolling road, with the engine being worked is really something to watch, see and feel!

Around 1.5 hours later I had a transformed coupe. A small up tick in performance at 268ish bhp from a stock motor. No fuel pump/mods.

But in the road...wow. More performance then you could ever deploy. Torque everywhere-so you can drive the car 1st/3rd, 4th/6th etc off boost and not needing to tickle the turbo. Or deploy the turbo and see the countryside start to fly by.

MPG readily improved. With full tank from middle UK -my last eu adventure found me pulling in for a considered fuel stop with a 1/4 of a tank of gas left at the border of Belgium in to Germany. So 3/4 to get through half of UK, across france, and down through the whole of Belgium.

The return-including laps of the 'ring - found the car safely back home in blighty-with jut under 1/4 of a tank.

Sounds too good to be true but I got an uptick in performance that you can feel clearly- AND lower fuel costs.

Would recommend a live tuning session with Mr Flea without any hesitation. Your missing something if you have not done this imho.

Regards

MM

Re: Fuel Efficiency [Re: Master_Mariner] #1646534
26/11/2020 07:00
26/11/2020 07:00
Joined: Sep 2006
Posts: 15,791
FCSS 01684 593187
Countrycruising Offline
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Originally Posted by Master_Mariner


Would recommend a live tuning session with Mr Flea without any hesitation. Your missing something if you have not done this imho.



I agree, having your Coupé live mapped totally transforms how the car drives including increasing fuel efficiency, its the finishing touch and worth the remap costs.

Re: Fuel Efficiency [Re: KevinW] #1646778
02/12/2020 09:59
02/12/2020 09:59
Joined: Dec 2005
Posts: 1,535
Glasgow,Near Florence..If only...
paul Offline
My life on the forum
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Posts: 1,535
Glasgow,Near Florence..If only...
agree with the above comments ,there is not really that much you do do "mechanically' to improve consumption ,losing weight would of course help, the other way as Mariner has shown ,is to basically make sure your coupe is running as healthy as possible,to get the most efficient engine a live re Map is is in my
mind the best bang for buck answer, it gets the most out of every component in the engine and make sure its running at its healthiest .
spending any money on new 'efficiency' mods would take ages to re coup the costs and I doubt you would see any more than 2-3mpg extra anyway .

live re map. lose weight (the coupe is a lardy old girl) ..would be the most efficient way forward in my mind


was Paul S,now just paul...Member since Oct 2000,Coupe may be FATALLY injured - :(oh no it's not smile

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