back up my math/ confirm some numbers

[Blknight.aus]

Im in the middle of test and tuning on the new landy. 3.5l v8 with the twin 175cd strommies and points in a series landy pushing an lt95 with what Im assuming is 3.54:1 diffs and 7.50R16 rubber

my test track was 30Km (29.97 on the gps track log) all city cycle

on refuel after the test run I burnt 4ish (3.9something) liters of fuel (paint marked the servos floor and filled up to the brim of the filler before and after)

lets call that 4l/30KM

I crank that out to be 7.5k/l and 13.3l/100Km


Now unless my maths is wrong, the GPS is lying, the pumps under reading or my memory is a lot worse than I suspect.

isn't 13.something l/100 ment to be about as good as the 3.5l does on highway cycle ?

[PhilipA]

I think you have a bubble in the tank.
Stand on bumper , jump up and down 20 times and try again.

Regards Philip A

[Blknight.aus]

did that, I've refuelled the station wagon rear tank before today.

[Debacle]

Must have a Hi Clone fitted

[Bigbjorn]

20 mpg. Don't complain. You will never get better from one of these. 15-16 mpg is the norm, less if you are pushing hard or towing.

Edit 21.2mpg. 62.15 miles/ 2.93 gallons.

Don't touch anything. Keep self-appointed experts away from the CD carbs. Use physical violence or firearms if necessary.

[spudboy]

That's actually 21.2MPG by my calculations (2.82 / 13.33 * 100), so pretty amazing.

My old 3.9 was lucky to get better than 16 - 18 MPG even in the best conditions. Around town I couldn't bring myself to calculate the consumption as I'd probably end up crying :(

[djam1]

Dave I have a Stage 1 V8 so very similar setup
The figures you quote are the same as the best I have ever had
Must admit I had to drive pretty steady to do that I usually expect less than that.

[Mick_Marsh]

I'm getting similar fuel usage on my recently rebuilt Series 3 Stage 1.

Same motor, same tyres.

[scrambler]

dreamers. I'd say 18l/100 around town would be more usual, and you MIGHT get under 15 if you really tried hard, but 13 ... dreaming.

Unless ... SWB or LWB? and how much stopping? Iff swb with constant running, that would be right.

EDIT - and also depending on the LT95. What was it out of? 70's Rangie at 1:1? Stage 1 at 1:67:1?

[nzlandies]

Those figures seem brilliant. I have never been able to get that put of my 110 V8 flatdeck. It has the same carbs but its five speed. You must be much better at setting them up than me as the best I can do is 16-18 around town but I have had the same results as you on a long run.

One thing I have noticed is that often when I fill up after a short trip and calculate the consumption it seems to be economical up around 18-20. If I run the tank low before a fill up and calculate the consumption it is almost always exactly same at 16-18 to the gallon. So is keeping the tank brimmed all the time doing something like helpful like keeping the fuel cooler maybe. probably in my head.

[51jay]

Are the series vehicles lighter than the RR and Disco?.......
or were you just driving like an old lady?? :D:D

[Mick_Marsh]

Mine's a tray, fairly light and unloaded, and yes, I do drive like an old lady. Lead foots drink heavily.


Seen on a Tasmanian speed restriction sign - "It' a limit, not a challenge."

[Blknight.aus]

Are the series vehicles lighter than the RR and Disco?.......
or were you just driving like an old lady?? :D:D

ahhh.....

the penny drops...

yes buy about 3-400KG if memory serves..

most of my running wasnt hard pushing as I was doing the timing the lights thing..

as for setting them up all Ive done to it so far is jigg the dizzy timing a little and connect the 2 carbs throttle levers together which was why it was down on power only one carb was running with about a 9 inch of mercury diffference between the 2 carbs before I started.

[Rangier Rover]

If you are willing to stuff around on a dyno, change needle and seats and tune the dizzy advance curve it is possible to get up to 25 MPG out of a 9.2:1 3.5V8.I have done it.;)
Stuffed if I can get an EFI to do it though:(

[rovercare]

Your figures are practically useless, you did 30km's and refuelled, way to many margins are fine lined there, you need to use tankfulls to retrieve accurate figures:)

[Blknight.aus]

Im using the same test run for each run while I dial in some minor changes as Im trying to tune it Im after the big number changes.

even the 200Ks worth of running that I did before I started playing with tightening up the linkages only burnt up 28L

[Tank]

Dave all you need now is some High Speed gears for the Transfer Case and you'll be set, Regards Frank.

[Blknight.aus]

no I think I have it sussed.

one of the carbies isnt playing the game....

wont make 100 and I cant even hold 80 on a hill and after the tip run with me alex and SWMBO its 2t with a full tank.

Think its time to take it to a carby specialist.

[Dougal]

Does this setup return warm fuel to the tank?
On EFI vehicles you can get enough heat into the fuel to skew the volume by a measurable amount.
The way around it is pretty easy, let the tank cool before refilling it. Overnight is good.

Or just keep doing laps and burn enough fuel to minimise the fillup error.:cool:

[Blknight.aus]

8 laps today, from the rough numbers ATM id be pretty happy to call it 14ish l/100 but I've got bugger all power the fuel heat issue Im aware of which is why I was only doing short runs and then topping the tank off

the cars alright for town cruising ATM but Id hate to be doing a trip in it.

I have a bad feeling that one (and therefore both) strommies are in want of a major overhaul, I got the timing stable but still cant get it to do a stable warm idle or restart without a little choke....

Its been way too long since I setup carbies.

[87County]

8 laps today, from the rough numbers ATM id be pretty happy to call it 14ish l/100 but I've got bugger all power the fuel heat issue Im aware of which is why I was only doing short runs and then topping the tank off

the cars alright for town cruising ATM but Id hate to be doing a trip in it.

I have a bad feeling that one (and therefore both) strommies are in want of a major overhaul, I got the timing stable but still cant get it to do a stable warm idle or restart without a little choke....

Its been way too long since I setup carbies.

have you fitted new diaphragms to them Dave?... even the smallest pinhole leak will affect performance (I used to play with 175s on the 6 cyls)

[Blknight.aus]

since its been bloody ages since I played with carbies all I have on shelf carby wise is a couple of kits for the 36IV and my small engined stuff like the mowers, snipper and saws.

Theres a carby specialist in the switch hes gunna get a call.

[dobbo]

So where are the piccies of the new toy?

[Blknight.aus]

on the camera...

the camera doesnt want to talk to the XP box and the vista laptops wont read the memory card unless I format the card. Stupid bloody windows.

theres one pic in the skullers thread that I convinced the vista laptop to read off of the card after I left it in overnight while it tried to recognise the card.

[dobbo]

I'm having similar problems with SD HC cards, normal SD cards work fine, SD HC no chance without an external card reader.

The Wii reads everything fine.

[Blknight.aus]

it IS a normal SD 1Gb card I know the HC ones gie problems that why I dont use them in camera.

[dobbo]

Looks alright, you keeping the rangie axles? I still think it's a better setup on emergency isolation of the front diff, and a lot easier to cart spare CV's

[Blknight.aus]

Let me get it running right first.....

still have to put a radio in for swmbo.

she likes it more than big red to ride in as theres more room seating wise (which was one of the mods slated for big red.

This afternoon will see the linux box hooked up to the camera to get the photos off ot a USB stick to get the photos into photodbucket and a write up will be done.

then I'll do a write up on selling big red.

[Captain_Rightfoot]

You have to be careful with GPS distances as they don't account for hills very well. :)

That might not be the case with navigators that have the road network onboard.

[Blknight.aus]

yep they usually run the distance short on the hills.

but Its the same track that I do on a semi regular basis and it shows up as near as damnit to 30 Ks on big reds speedo, the GPS;s route calculator, googlemaps and following the route with GPSDASH 2.

As Im only using it at this stage for comparitive numbers while Im doing Test and tunes Im not too stressed if the numbers not accurate to the Nth decimal place so long as it indicates a big sudden change that means one side is basicaly dumping.

Its still not idling and its flat from idle and my current worry is overhauling them.

[StuRR80]

since its been bloody ages since I played with carbies all I have on shelf carby wise is a couple of kits for the 36IV and my small engined stuff like the mowers, snipper and saws.

Theres a carby specialist in the switch hes gunna get a call.

Dave, I would be interested to know who it is and what you think of their work. I'm sure my RRC needs a good tune before I start driving it daily.

[Mick_Marsh]

I'd like to thank all involved for this discussion.
I've been thinking since my motor rebuild, I've been getting very good fuel consumption for a V8 4wd. Since following this thread I think I might have a carby/ tune problem also. I'll get someone with more nouse than me to look at them.
I'll ask in a new post for people's recommendations of a carby magician in western Vic.

This is a great forum.

[nzlandies]

Have you got the mixture tool for the strombergs and a balancer, like an old crypton. Sounds like its just running lean. Is there any holes in the diaphragms and are there any wear marks on the seats?

[Blknight.aus]

this 28KM route (http://maps.google.com/maps?f=d&source=s_d&saddr=64+Chubb+St,+One+Mile+QLD+4305&daddr=ebbw+vale+to:Warrego+Hwy+to:-27.583763,152.766438+to:64+Chubb+St,+One+Mile+QLD+ 4305&hl=en&geocode=FZtMWv4d0aYaCSm5HSd627WWazFgOYeZykBj3g%3BF arQWv4dkukbCSkvyKXDsrSWazGJC7BDfXO0Dw%3BFaUBW_4dkv gbCQ%3B%3BFZtMWv4d0aYaCSm5HSd627WWazFgOYeZykBj3g&mra=dme&mrcr=1,2&mrsp=3&sz=13&via=2&sll=-27.591523,152.787895&sspn=0.108931,0.154324&ie=UTF8&z=13) for about 4

And after a guestimation balance

This 200KM route (http://maps.google.com/maps?f=d&source=s_d&saddr=64+Chubb+St,+One+Mile+QLD+4305&daddr=RAAF+Base+Amberley+to:Western+Fwy+to:182+Anz ac+Ave,+Kippa-Ring+QLD+4021,+Australia+to:-27.393717,153.112507+to:Junction+Rd+to:Centenary+H wy+to:Eleazar+Drive+blacksoil+to:64+Chubb+St,+One+ Mile+QLD+4305&hl=en&geocode=FZtMWv4d0aYaCSm5HSd627WWazFgOYeZykBj3g%3BF UA_Wv4d8zEaCSkd1o20FbaWazH2Mv9yRa3Nzw%3BFdaSXP4d7B QeCQ%3BFWSJYP4dHhAgCSm3HQ4R8OWTazGqS1VN24a1Qg%3B%3 BFTqrXf4dlHUfCQ%3BFRYSXP4d9tAdCQ%3BFYNBW_4dNyEaCSn 3LFk-yraWazH2zF8G9CyaHQ%3BFZtMWv4d0aYaCSm5HSd627WWazFgO YeZykBj3g&mra=dpe&mrcr=2&mrsp=4&sz=13&via=2,4,5,6&sll=-27.392498,153.098087&sspn=0.109128,0.154324&ie=UTF8&z=13http://maps.google.com/maps?f=d&source=s_d&saddr=64+Chubb+St,+One+Mile+QLD+4305&daddr=RAAF+Base+Amberley+to:Western+Fwy+to:182+Anz ac+Ave,+Kippa-Ring+QLD+4021,+Australia+to:-27.393717,153.112507+to:Junction+Rd+to:Centenary+H wy+to:Eleazar+Drive+blacksoil+to:64+Chubb+St,+One+ Mile+QLD+4305&hl=en&geocode=FZtMWv4d0aYaCSm5HSd627WWazFgOYeZykBj3g%3BF UA_Wv4d8zEaCSkd1o20FbaWazH2Mv9yRa3Nzw%3BFdaSXP4d7B QeCQ%3BFWSJYP4dHhAgCSm3HQ4R8OWTazGqS1VN24a1Qg%3B%3 BFTqrXf4dlHUfCQ%3BFRYSXP4d9tAdCQ%3BFYNBW_4dNyEaCSn 3LFk-yraWazH2zF8G9CyaHQ%3BFZtMWv4d0aYaCSm5HSd627WWazFgO YeZykBj3g&mra=dpe&mrcr=2&mrsp=4&sz=13&via=2,4,5,6&sll=-27.392498,153.098087&sspn=0.109128,0.154324&ie=UTF8&z=13) For 24L of unleaded


Atm I havent gone to any great lengths to get them perfect and I havent pulled them apart. Its low on power but getting better the carbs are now within an inch of mercury as opposed to the 9 that I started out at but I suspect that its not pulling enough vacuum Im out of time to do any in depth diagnosis, the plug I pulled to check its mix looked good but Ive only had it running for about 600K while Ive been playing with it setting the timing, idle stops, linkages and choke stop.

[nzlandies]

If it wont idle without choke then isn't it just running lean. If you have the mixture tool then its just a mater of screwing them anti-clockwise to richen them, then re-topping the dash pots with oil and test until sweet.

[Blknight.aus]

yes, assuming everything else is ok.

sometimes it idles like a swiss watch other it struggles even with about 1/4 choke on.

Im thinking its a combination of junk fuel, a diaphragm leak and dodgy cables.

whoever did the last work on it got it to idle by winding up the idle on the drivers side carby removing the throttle arm linkage and winding in the choke stop on the passangers side carby.


I have noticed that the pickup and flat spots are starting to go away as I get fresher fuel into the tank

[nzlandies]

Thats amazing. I just bought a 110 which they had done the exact same thing. I screwed them back and it had no power, but it did idle. It would only go if I pulled the choke out. So I set about with leads, cap, rotor, coil, plugs, fuel filters, new diaphragms. All these thing made little improvements especially the coil which was getting very hot, but still wouldn't run under load without choke. When the choke was pulled correctly depending on revs and load it would go very well. So I got out the mixture tool and adjusted the mixture, better but still no go under load.

It was the simplest thing in the end. I noticed a split in the breather hose. Pulled them off and blew down them. Blocked. Test drive with clear Carb breathers and after a re-tune and its nicest running V8 I have ever driven.