Discovery 1 3.9L V8i Fuel Consumption

Land Rover Discovery 1, 2 and 3

Moderator: pretdave

Discovery 1 3.9L V8i Fuel Consumption

Postby Quintin » 23 Apr 2010 10:38

Hi All

I am quite new to the Landrover family and have just bought a 1996 3.9L V8i Discovery.
I am finding the fuel consumption on the very heavy side.

Is there anything I can do to improve the consumption?

:o
Quintin
 
Posts: 1
Joined: 23 Apr 2010 10:17

 

Re: Discovery 1 3.9L V8i Fuel Consumption

Postby colinwpa » 23 Apr 2010 11:55

Hi Quintin,

Elsewhere in this forum is a lot of debate about what to expect for the V8 (refer the thread viewtopic.php?f=6&t=2352&start=0&st=0&sk=t&sd=a), but it seems you should expect around 5km/l worst case normal driving, and up to about 8km/l best. Offroad expect worse!
1990 Defender 110 V8 Hard Top
'06 D3 TdV6 SE - For Sale - PM me!
'02 Disco II Td5 XS - Sold Aug 2013
Yamaha TMAX 500 Scooter - Sadly sold
-----------------------------------
colinwpa
 
Posts: 320
Joined: 06 Jan 2010 14:17
Location: Diep River, Cape Town

Re: Discovery 1 3.9L V8i Fuel Consumption

Postby koosjr » 24 Apr 2010 06:26

Don't let this be a surprise for you.

Petrol 4x4 vehicles are always heavy on fuel and 5 km/l with a little better and a a little worse is about the norm. Most diesels again, runs a t about 8 km/l with a little better or a little worse.

What always amazes me, is that guys buys petrols and then tries to tune it for better consumption.

On the other hand, guys buys diesels and then tries to get more power from it.

Both scenarios often leads to motor failing prematurely.

Why can't poeple just accept the pros and cons of each motor and choose the best one for their application?

Which, IMO should normally be a diesel. :twisted:
User avatar
koosjr
 
Posts: 258
Joined: 17 Apr 2010 18:56

Re: Discovery 1 3.9L V8i Fuel Consumption

Postby hgb-560sel » 29 Apr 2010 18:33

Hi Quintin

there are a few well tried "tricks" to improve both power delivery and fuel consumption on V8's. I have some 34 years experience in this. There will be no earth shattering difference, but you will end up with a more responsive car and have more fun from it.

I assume, that your V8 is a Manual, here it goes:

1. Make sure that the suppressor plugs (the one that fits on to the spark plug) are in good condition. Measure these for resistance hot and cold

2. Fit NGK plugs with the "ET" suffix, the "T" stands for three mass electrodes. They will give better flame propagation and perform better especially under heavy load. On my MB 560SEL I get some 0.7lt better consumption just from these plugs.

3. Treat engine, transfer case and diffs with Poly-TFE "Engine" and the manual gearbox with Poly-TFE "Hydraulic". This will add some 10% more power delivery at the rear wheels. It takes some 4000km for this to work properly and has to be repeated after 80'000km.

4. Use 93 Petrol at the Reef and 95 Petrol at the coast. There is no benefit to use 95 petrol at Reef altitude.

Poly-TFE is available from Seydlitz Werkstatt in Constantia Park and also from Dirk van der Westhuizen of Forktruck Solutions in Bellville.

I trust that I have been able to assist you. The above tricks have been well proven and are currently used in all our vehicles locally and in Switzerland.
with kind regards
George Bosch
________________________
1998 LR Disco1 ES Tdi
2005 LR Disco3 TDV6 S
1955 MB 300SL W198/I
1988 MB 500SL R107
1991 MB 500SL R129
1958 Porsche 356A Coupé
1979 VW Beetle Cabrio (Karmann)

And some more serious stuff ;)
hgb-560sel
 
Posts: 457
Joined: 10 Feb 2010 05:57
Location: Pretoria, South Africa

Re: Discovery 1 3.9L V8i Fuel Consumption

Postby hgb-560sel » 01 May 2010 06:19

hgb-560sel wrote:Hi Quintin

there are a few well tried "tricks" to improve both power delivery and fuel consumption on V8's. I have some 34 years experience in this. There will be no earth shattering difference, but you will end up with a more responsive car and have more fun from it.

I assume, that your V8 is a Manual, here it goes:

1. Make sure that the suppressor plugs (the one that fits on to the spark plug) are in good condition. Measure these for resistance hot and cold

2. Fit NGK plugs with the "ET" suffix, the "T" stands for three mass electrodes. They will give better flame propagation and perform better especially under heavy load. On my MB 560SEL I get some 0.7lt better consumption just from these plugs.

3. Treat engine, transfer case and diffs with Poly-TFE "Engine" and the manual gearbox with Poly-TFE "Hydraulic". This will add some 10% more power delivery at the rear wheels. It takes some 4000km for this to work properly and has to be repeated after 80'000km.

4. Use 93 Petrol at the Reef and 95 Petrol at the coast. There is no benefit to use 95 petrol at Reef altitude.

Poly-TFE is available from Seydlitz Werkstatt in Constantia Park and also from Dirk van der Westhuizen of Forktruck Solutions in Bellville.

I trust that I have been able to assist you. The above tricks have been well proven and are currently used in all our vehicles locally and in Switzerland.


Just to add: We have been using the Poly-TFE products since 1991 with tremendous success. Apart from the elimination of cold start wear and tear on the engine, it is the only product on the market to effectively prevent glazing on diesel engines under heavy use. :D
with kind regards
George Bosch
________________________
1998 LR Disco1 ES Tdi
2005 LR Disco3 TDV6 S
1955 MB 300SL W198/I
1988 MB 500SL R107
1991 MB 500SL R129
1958 Porsche 356A Coupé
1979 VW Beetle Cabrio (Karmann)

And some more serious stuff ;)
hgb-560sel
 
Posts: 457
Joined: 10 Feb 2010 05:57
Location: Pretoria, South Africa

Re: Discovery 3.9L V8i Fuel Consumption

Postby J du Toit » 06 Aug 2013 10:34

Hi all

I bought a 1996 Discovery 3.9L V8i one year ago and the absolutely best fuel consumption that I could get on the open road was 5.5 km/l at a steady 100 km/hr and trying my best to lower consumption. Driving in town it was 4 km/l or worse!

I tried the following simultaneously:

*Poly TFE in engine, gearbox and transfer box

*New exhaust system with bigger pipes( +- 80 mm diam)

This past holiday we went to the Kgagaligadi National park and my average consumption improved to 6.6 km/l for the 6 day trip which included 4 days of stop go game viewing in the park. The four times I filled up in the park the consumption was always better than 6 km/l.

On the open road I got 7.6 km/l while driving 120 km/hr and not really trying to conserve fuel.

I am not sure which of the two things I tried( Poly TFE or bigger exhaust) made the big difference , but I am very happy with the end result !

Regards

Johan du Toit
J du Toit
 
Posts: 1
Joined: 06 Aug 2013 09:56


Return to Discovery

Who is online

Users browsing this forum: No registered users and 1 guest

cron