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Post by Mike’S-a-loon on Sept 21, 2020 15:13:57 GMT
Hello folks,
Quick question: what kind of mileage do you get from your P5b?
I used to get around 190 miles from a full tank around town, a bit better on a run. It always seemed like a terrible return for 55 litres of petrol...
I’ve since had a heap of engine/carb work done, to original spec, but haven’t had much opportunity to use the car as I’m currently living in a different country.
Any brilliant suggestions to improve things a bit?
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Post by Eric R on Sept 21, 2020 19:23:55 GMT
prnt.sc/ulcepzmuch depends if you have a heavy right foot! Both my Rovers exceed these figures.
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Post by lagain on Sept 21, 2020 19:40:29 GMT
Just had a week in Scotland and I was probably getting about 21 MPG. If the tank was brimmed I could get about 230 before filling up with the needle not far from empty. But with the gallon and a half reserve a tank could possibly do 260.
After a good run have a look at the spark plugs, they should be a mushroom colour. If they are sooty the mixture is too rich.
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Post by enigmas on Sept 22, 2020 2:23:17 GMT
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Post by Phil Nottingham on Sept 22, 2020 5:52:34 GMT
We get 23-24 on our annual tours of Ireland. 21 locally commuting all year round. This was all last year as we have been nowhere far in any of our classics since March
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Post by Mike’S-a-loon on Sept 22, 2020 6:58:32 GMT
Thanks Enigmas!
So what kind of mileage are you getting with your big P76 engine?
Good suggestion on the transmission upgrade. It’s on my long term wish list! Any idea if there’s a company in Melbourne who would take the job on?
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Post by enigmas on Sept 22, 2020 11:09:02 GMT
Hi Mike...Well I don't know about a big P76 engine...4.4 litres ain't that big!  There's a benefit though, the longer stroke means a torquier engine...it'll pull a taller diff ratio. Years ago I fitted a 2.9:1 differential to the car (the original P5 diff was modified by a specialist company) and this helps a lot at cruising speeds. The coupe sits easily at legal highway speeds at 2500 - 2600 rpm. That's still too high by modern standards but equivalent to most Aussie (family) V8s of the 60s and 70s. Leyland P76 V8s run this gearing. My coupe is full time LPG car but has provision for petrol (I've not bothered to hook it up yet) as it runs a fully programmable electronic ignition setup. (2 ignition MAPs, LPG & Petrol at the flick of a switch) Petrol was only ever intended as a backup fuel if I couldn't find a LPG outlet. I do have a couple of ZF (4HP22) transmissions and have virtually finished adapting a Jaguar version to a spare P76 engine. Here's the link to some useful ZF trans info. roverp5.proboards.com/thread/10666/zf4hp22-tech-miscellanyAnd here's a link to the Programmable Ignition module. The non kit version at the end of the page is an easier option. Aldon Amethyst (UK) make a programmable ignition module with a very easy to use USB laptop interface for programming. roverp5.proboards.com/thread/9873/silicon-chip-programmable-ignition-module |
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Post by Brendan69 on Sept 25, 2020 6:49:29 GMT
I don't care what i get, i just enjoy the drive. Same as in my Rolls Royce. If you have to worry about MPG figures then its time to sell unless of course you are using it as a daily driver car in which case a decent return would be good to know.
Regards,
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Post by Phil Nottingham on Sept 25, 2020 9:11:36 GMT
I don't care what i get, i just enjoy the drive. Same as in my Rolls Royce. If you have to worry about MPG figures then its time to sell unless of course you are using it as a daily driver car in which case a decent return would be good to know. Regards, My view entirely and I used them all regularly - the S2 LR only does 15mpg! We used to spend more on car fuel than food. |
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Post by lagain on Sept 25, 2020 15:25:17 GMT
I don't care what i get, i just enjoy the drive. Same as in my Rolls Royce. If you have to worry about MPG figures then its time to sell unless of course you are using it as a daily driver car in which case a decent return would be good to know. Regards, Quite agree, although I nearly choked on a Werther's original when filling up on the motorway and the super unleaded was nearly £1.50 per litre |
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Post by Sam Bee on Sept 25, 2020 19:03:25 GMT
That is why I have gone out to 3.9 litre with 9.35 CR so that standard (premium) fuel can be used. Getting extra torque and about 30 extra gee-gees at the same time. Will be most interesting to see what MPG that results in.
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Post by ray on Sept 26, 2020 6:50:52 GMT
I often check mine, it helps to know how well the motor is running. I get about 21mpg fairly regularly for an average tank full. You have to consider the type of journey as if stuck in town traffic for longer parts of any journey it would get less.
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Post by Deleted on Sept 27, 2020 9:28:18 GMT
I had one of the very first XJS V12s,it seldom got into double figures. Flat out it could burn money much faster than I could earn it.
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Post by Brendan69 on Sept 28, 2020 17:42:42 GMT
I often check mine, it helps to know how well the motor is running. I get about 21mpg fairly regularly for an average tank full. You have to consider the type of journey as if stuck in town traffic for longer parts of any journey it would get less. You have a fuel guage, a temp guage and an oil pressure guage to tell you buddy. Thats enough i think and if the tail pipes are clean ish then she is running fine. |
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Post by Warwick on Oct 4, 2020 11:58:47 GMT
About 10 years ago I was contemplating updating my trusty 1987 EFI Range Rover 5-speed to a good 2nd-hand Range Rover P38. It was an automatic. I asked someone locally who had one, what the fuel consumption was like. His answer? "If you need to ask, better not buy one."
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Post by Brendan69 on Oct 4, 2020 15:35:58 GMT
About 10 years ago I was contemplating updating my trusty 1987 EFI Range Rover 5-speed to a good 2nd-hand Range Rover P38. It was an automatic. I asked someone locally who had one, what the fuel consumption was like. His answer? "If you need to ask, better not buy one." I bought a P38 Rangie 1 week ago and already i am beginning to regret it. Always wanted to add one to my collection. Its a 2002 Westminster 2.5 TD model. 1 of only 50 TD Westminster's ever made so very rare indeed. Sadly after just 1 week of ownership and only travelling 100 miles home from the dealer she has broken. Suspect Turbo failure. lack of power and smoke out the back. No warning lights on and all guages as they should be. She starts and idles perfectly but as soon as you start to drive her she is gutless and juddery. Oh well, its of to the Rangie doctors this week and the dealer will be getting 50% of the bill which after a few words on the phone this morning he has agreed to. So if you are thinking of changing up from a classic rangie to a P38, look long and hard and buy carefully. Putting this aside they are indeed a lovely vehicle to own and the seating position is great too with a commanding presence as you drive it. I chose the BMW M51 2.5 TD option simply because i already have to petrol V8 monsters in my collection ( P5B and Rolls Royce Silver Shadow ) so the TD option for me was the best option for what i intended to use it for which was long runs. Lets hope i will get to enjoy those long runs once more soon. |
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Post by Phil Nottingham on Oct 6, 2020 8:09:51 GMT
Bad luck - perhaps warning lights have been disconnected? Surely dealer should pay for all repair costs or reject the vehicle
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Post by Sam Bee on Oct 6, 2020 9:28:14 GMT
Phil ios correct. As it is obviously a "bad u'n' would advise rejecting the sale. If they will not take back, nor pay rectification in full, then next stop is your local Trading Standards people. You have consumer rights.
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Post by dhb5610 on Oct 9, 2020 20:11:49 GMT
21 on 11gallons distance travelled 230 miles not bad I don't think
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Post by Jens Munk on Oct 27, 2020 22:54:08 GMT
About 7.5 km/l = 21 MPG (Imp). Not too bad all things considered.
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Post by Warwick on Oct 30, 2020 13:50:08 GMT
That's about what I used to get with my old 1976 2-door Range Rover. (Wish I still had it)
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Post by Deleted on Nov 12, 2020 10:28:41 GMT
I bought a P38 a few years back. In lots of ways the most infuriating vehicle I have ever owned. Some small jobs turn into nightmares with access almost impossible and crazy spares prices. The jobs I was warned about being difficult (mainly anything to do with the air suspension) proved simple. The electrics are a pain,parasitic drain,and never,ever disconnect or reconnect the battery without leaving a door open.
But,on a long journey,comfortable and fast and relatively quiet so you can forgive it most things,I've even seen 28mpg on a run.
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There's a benefit though, the longer stroke means a torquier engine...it'll pull a taller diff ratio. Years ago I fitted a 2.9:1 differential to the car (the original P5 diff was modified by a specialist company) and this helps a lot at cruising speeds. The coupe sits easily at legal highway speeds at 2500 - 2600 rpm. That's still too high by modern standards but equivalent to most Aussie (family) V8s of the 60s and 70s. Leyland P76 V8s run this gearing. 
