new g wagon
I have just purchased a 463 g wagon to add to my collection
Petrol 3.0 auto
Anyone got some honest fuel figures for general driving. I will know when i get it home but i am trying to compare my om606td converted g wagon to the 3.0 petrol auto which is not fair. Cruising at 70mph what are the engine revs on the petrol 3.0ge
I have done many projects but whats a good petrol engine that is strong and economical and an easy fit
5 speed autos i would also like to know about those. Do i need an electronic controller for a 5 speed auto and which ones are the best
Yes i am sorry for so many questions but i need to know. If anyone in the world could tell me what power feeds and earth wires for my ecu i need to run my 5.5 bi turbo mercedes sls engine i would fit that in it but no one can help. I am getting there slowly after picking through 2 wheelbarrows full of wiring loom
I have a wiring diagram but it does not state 12 volt and 5 volt and earths clearly and i am pretty sure i have most but dont want to damage the ecu. Can anyone help as every other stand alone ecu company or whatever cant help me. Little box ecu and some electronics how hard can it be for someone to tell me what feed is what and i will pay whatever within reason. Bosche were the most helpful at a cost of 6000 for a motorsport ecu plus loom etc
If i get it up and running i will be pleased and im sure i will now its not so cold in my garage and i feel like doing a bit
The engine is fitted in a mercedes 190 and i have modified to manual box and rack instead of steering box. Al it needs is running and i can do the rest
I will post pics of g wagon if it makes it home
I have just purchased a 463 g wagon to add to my collection
Petrol 3.0 auto
Anyone got some honest fuel figures for general driving. I will know when i get it home but i am trying to compare my om606td converted g wagon to the 3.0 petrol auto which is not fair. Cruising at 70mph what are the engine revs on the petrol 3.0ge
If you cruise at <70 mph you can just about get 22 mpg on a 3.0 auto SWB. RPM will be around 3,600, but the M103 is an engine designed for revs and will be happy all day at 6,000 rpm.
Around town, may be 18 mpg at best.
5 speed autos i would also like to know about those. Do i need an electronic controller for a 5 speed auto and which ones are the best
There were two versions of the 5-speed. The latter is all electronic, but is the best one. The earlier one had some reliability issues and was electro-hydraulically controlled.
The 4 speed that you have is not bad, though - very good, in fact, if properly adjusted.
There was a 5 speed version of your autobox fitted to the w124 and the w129 SL with the om104 3 litre 24v engine. Put basically its the same engine block and ke jetronic fueling system as yours but with a double over head cam cylinder head. Rare now though.
My manual version of your truck swb which has a catalyst delete and a k&n, only averages 19/20 mpg in mixed motoring, which make 18 in a lwb quite good
The M103 is one of the most reliable engines as nearly everything is mecahnical and the electronics are mostly used for fine-tuning the fuel injection. The newer 5-speed electronically-controlled transmission is a little cleverer than the 4-speed. For instance,, it can detect inclines and respond accordingly, but in terms of smoothness and shifting, the 4-speed is just as good and is practically indestructible. Change the transmission oil and filter and re-fill with a good synthetic oil (Fuchs SL 6000) and it will be really good. The only weak spot may be the shift modulator, which is a vacuum operated device and it may be a good idea to replace this if you think the shifting is harsh or too sloppy. A revised and uprated version was introduced in 1994. It's about £100 and attaches from the outside.
On the engine, be prepared to change the valve-stem seals if you see high oil consumption. It's an age thing: the rubber dries out, and it's quite a common issue on the M103. The only other possible issue is a coolant leak, typically from the rear corner of the cylinder head and block (exhaust side). If so, a new head gasket (improved) will be required.
You'll get a bit more poke by deleting the cat and removing the final exhaust box, the whole exhaust system is extraordinarily convoluted. If you want to go further there are old style tuners who will build you a big valve head, the price of more power will be worse fuel consumption.
Glad to hear rhat you managed to collect the car without any issues.
The top section of the timing chain cover has a number of seal interfaces and will eventually leak some oil. It's a quick job to fix, but you need to use the type of Loctite RTV silicone (type 5900) for long-term effect.
If you go any faster than 70 mph fuel consumption increases dramatically.
There are quitre a few (around 90) on Autotrader, although many of them are LHD, and surprisingly there are some newer ones (eg 2011, G500, 78k miles, at £29k) ) that are significantly cheaper than some from year 2000. But I suppose you are looking for pre- March 2006 for lower road tax.
A white 1997 G300 caught my eye, if you are looking for another G300. However, that engine works best with SWB.
If you don't mind LHD, and prefer Diesel, there is a LWB, G400:
£28,000: Mercedes-Benz G Wagen G 400 4.0 G 400 9 seat
Well, SWB versions are my favourite. Much more maneuverable around town and easier to park. Sounds like you have a plan, then.
Well, SWB versions are my favourite. Much more maneuverable around town and easier to park. Sounds like you have a plan, then.
Nice colour.
Is that Beryl Blue?
Paint work looks to be in good condition. very different colour from yours, so will be hard to get them mixed-up.
Arnie - is that definite - a SWB 300G should be doing 70mph at 3,600rpm??
Just been out in mine and 3,500rpm is 60mph and very close to 4,000rpm to hit 70mph
Could there be a problem brewing?
G speedo is hopeless for accuracy , suggest you compare with a Sat Nav , also aftermarket wheels have an influence on rpm/mph
Yes, i think if you look at the speedo, it's approx 3,500 revs for 70 mph: about 20mph/ 1,000 rpm. But speedo is a little overoptimistic on mine. That's why I said 3,600, as a guess.for true 70mph
Below are some tables with calculated values, based on published grear ratios for the 300GE, Auto, with standard tyre/wheel sizes and ideal tyre diameters
The figures you get might depend on what tyre size you actually have, if you are going by GPS speed figures, rather than speedo, (and speedos are generally designed to over-read).The 300GE also had a mechanical speedo in the early versions and an electronic one in later versions, so other factors to consider.
Importantly, I think that the 4-speed auto does not have Torque-Converter Lock-up on 4th gear, meaning there will always be some slip. So, depending on load (eg driving up-hill or against strong winds), the engine RPM will be a few % higher than the ideal figures below. You can check by driving at slightly more than the indicated 70 MPH and then taking your foot off the accelerator so that the engine is on over-run and look at the RPM when the speedo needle hits 70. It should give a lower RPM and then you can take the average of the 2 readings (RPM at 70 under power and at 70 on over-run).
If your RPM figures are significantly higher, eg 4,000 rpm at 70 MPH, it may be due to tyre sizing (have seen people use lower profile tyres, eg 265 / 60 R16), or excessive torque-converter slip due to low fluid-level in the transmission (fluid level is checked with engine on.)
Hmmm - my tyres are 265/70/15 which, I think, means that I am actually doing 68 when the speedo is reading 70. So that means I'm using even more rpm to maintain the desired speed.
Mark,
Well, that would go some way to explaining it. The original, factory-fit, 255 / 75 R15 tyres are very hard to find these days.
Is your 70MPH according to the speedo or GPS?
I've not been able to find any typical slip figures for the torque-converter on the MB 722.3 auto box, but if you factor-in some 5% slip and possible speed inaccuracy, you may be about there.
The auto box on these cars is very reliable, but it would not hurt to check the level and to do a fluid change, if it's not had one in a while.
More info on the gearbox (Mercedes 722.3)
https://en.wikipedia.org/wiki/Mercedes-Benz_4G-Tronic_transmission
'....The 722.3 has been used in a plethora of Mercedes-Benz cars. It is considered by enthusiasts to be one of the most reliable transmissions ever built by Mercedes-Benz with some examples exceeding 300,000 miles of service....
Thanks Arnie,
Could be the speedo I guess - I did wonder why I keep going past everyone else on the motorway when I think I'm only doing 70 .
Will check against satnav next time I have someone in the car with me - you really do have to pay attention to the road when driving a G at speed.....................
Hi
Should be converted from steering box to rack and fitted manual 6 speed gearbox