om603.931 (g-class) - more lowend torque solutions?

om603.931 (g-class) - more lowend torque solutions? - Printable Version

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om603.931 (g-class) - more lowend torque solutions? - kotka - 01-04-2011

hi, i need some kind of advice

i was reading the site over last several days trying to find out any finalised solutions for om603 non-turbo engine upgrade (603.931). unfortunately found no one yet.
the stock engine provides quite "slow old man style" driving on the almost 3 ton truck (113hp, 190nm). especially I face lack of torque in mud or on the highway with 35" tires.
so i need your advice on what could I do provided I need to keep the block original (unchanged). another important point - i would like to keep minimum level of electronics. the hps are not important but lowend torque is the key.

initially i considered putting om606 head (non-turbo) - ie change the setup to 4 valves one and revise the pump to add a bit more fuel. perhaps installing 6-7mm.

I was never thinking of turbo modifications as I simply was not aware of any good lowend torque solutions. probably there are some - that's why i need your advice on.

not sure yet that my block could fit 606 turbo - this is another potential solution but it requires some electronics + turbo and IC to be added....

So the questions are:
- would it ever make any torque wise sense to install 606 non-turbo and increase fueling?
- any ideas of the better minimal electronics lowend torque solutions?

PS my lovely g-wagon is used as a daily car but it is updated to fit my expedition truck requirments

RE: om603.931 (g-class) - more lowend torque solutions? - ForcedInduction - 01-04-2011

A non turbo 606 would only return another 20hp.

RE: om603.931 (g-class) - more lowend torque solutions? - winmutt - 01-04-2011

In Soviet Russia, this thread is worthless without pics. (or create a thread Car Profiles)

RE: om603.931 (g-class) - more lowend torque solutions? - tomnik - 01-05-2011

go for larger elements and delivery valves.
Start with this mod, if this is not enough it gets expensive and you will need larger elements anyway.

Tom

RE: om603.931 (g-class) - more lowend torque solutions? - kotka - 01-05-2011

ok - some photos

this is the engine bay
[Image: 07042009866.jpg]

this is the example of om606 non-turb installed on g-class
[Image: P1050894.jpg]

a couple of pics of my rig Big Grin

thanks - i'm aware that ld add 606 non-turbo will add just 23hp and 20nm through double camshaft and 4 valves per cylinder. I hope your experience could add some new ideas provided I dont want significantly increase fuel consumption.... Tongue

so any other ideas?

RE: om603.931 (g-class) - more lowend torque solutions? - E300TSC - 01-05-2011

Hi Kotka,

Nice truck! My UNIMOG has only 82HP (2.2l) turning 37" tires and weighs 6250 pounds. THAT'S old man! Smile

These small engines need high RPM's to generate any power - especially the non-turbo models. The 606 does virtually nothing below 3500 RPM.

What is your goal? Do you want to go faster in the mud or just have the power to move through the thick stuff? You might consider changing the differential ratios but that will sacrifice top speed.

RE: om603.931 (g-class) - more lowend torque solutions? - ForcedInduction - 01-05-2011

Nitrous. Wink

RE: om603.931 (g-class) - more lowend torque solutions? - kotka - 01-05-2011

that's the issue - i would like to have more torque at low rpms Cool

the initial purpose - is the expedition vehicle. I will send it to Latvia for complete restoration / modification in a couple of month - 20 years old veteran needs some nice care Shy

i use it for daily drive as well. I dont feel too slow on the streets but realy hate high rpms and need more low end torque.

the axles are 37:7 or 5.27:1 - the most powerful axle ratio of g-class. i will get my bolt on portals (5 inch) prduced in March Tongue

. the new axle ratio will be roughly 4.77:1 which will increase top speed but will slower the acceleration and torque on the wheels....

so that's why i need to add more power to engine provided i keep fuel consumption at the reasonable level....as this is an expedition truck Big Grin

RE: om603.931 (g-class) - more lowend torque solutions? - knut olav - 01-05-2011

(01-05-2011, 06:23 AM)kotka that's the issue - i would like to have more torque at low rpms

the initial purpose - is the expedition vehicle. I will send it to Latvia for complete restoration / modification in a couple of month - 20 years old veteran needs some nice care

i use it for daily drive as well. I dont feel too slow on the streets but realy hate high rpms and need more low end torque.

the axles are 37:7 or 5.27:1 - the most powerful axle ratio of g-class. i will get my bolt on portals (5 inch) prduced in March . the new axle ratio will be roughly 4.77:1 which will increase top speed but will slower the acceleration and torque on the wheels....

so that's why i need to add more power to engine provided i keep fuel consumption at the reasonable level....as this is an expedition truck

Hello, i have the same axle gearing as you but i think it is 5.28 it is the same as the military use at G290diesel.
Do you have more information about portal axle , price , manifactor, picture?.
i also drive offroad, i will go to Arctic trophy at Kola peninsuela for the 4 time in september.

RE: om603.931 (g-class) - more lowend torque solutions? - kotka - 01-05-2011

I'll make photos and full desc when I finally get them installed on the truck. This will be the first ever g-wagen on bolt-on portals of such ratio Smile

)))

very high level info so far:
- ratio 4.77 = main axle diff 4.11 (G55, G400, etc) X portal box 1.16
- CTIS installed Smile

- clearance change + 5"
- price indication: axles (~EUR5-7k for a set of used or change main diffs on your own ~EUR2-3k) + portals (~EUR12k) + hutchinson wheels (~EUR3-4K if needed) + installation charge

re axle ratio - u r right - 37/7=5.28+ Smile

bad calc of myself

RE: om603.931 (g-class) - more lowend torque solutions? - Captain America - 01-05-2011

CTIS!!!!!

RE: om603.931 (g-class) - more lowend torque solutions? - Jtn190D - 01-05-2011

Why not a om606 Turbo?

RE: om603.931 (g-class) - more lowend torque solutions? - kotka - 01-06-2011

(01-05-2011, 06:50 PM)Jtn190D Why not a om606 Turbo?

This is the whole question -if:
- om606 turbo could be installed on my om603 block
- any chance to get rid of electronics?
- is there any significant difference in torque between om606 non-turbo with bigger plungers pump and om606 turbo stock one?

RE: om603.931 (g-class) - more lowend torque solutions? - Jtn190D - 01-06-2011

om606 non turbo. 136ps-210nm

om606 turbo. 177ps-330nm

RE: om603.931 (g-class) - more lowend torque solutions? - kotka - 01-06-2011

Thanks - I know that. My question was about "upgraded" pump on om606 non-turbo vs stock om606 turbo.

RE: om603.931 (g-class) - more lowend torque solutions? - Jtn190D - 01-06-2011

If your going to buy a om606 just buy a turbo version, it will have far more potential.

RE: om603.931 (g-class) - more lowend torque solutions? - aaa - 01-06-2011

So why can't you just plop in a whole different engine?

To answer you:
- om606 turbo could be installed on my om603 block
IE putting the 606 head on a 603. I doubt it. They are very similar but the oil channels in the 606 are bigger for example.
- any chance to get rid of electronics?
Yes, the 603 mechanical pump fits fine on the 606 block. So just find a better mechanical pump (easier said than done lol). There is also a mechanical NA 606 pump on the 94-95 cars, that should give a little more fuel than an NA 603 pump.
- is there any significant difference in torque between om606 non-turbo with bigger plungers pump and om606 turbo stock one?
Dunno, I'd imagine yes.

I think you should just put a turbo and pump on your current setup. Unless you're willing to swap out the whole engine.

RE: om603.931 (g-class) - more lowend torque solutions? - Suppatime - 07-30-2013

(01-05-2011, 03:11 AM)kotka a couple of pics of my rig

What front and rear bumpers are those? I'm in love!

RE: om603.931 (g-class) - more lowend torque solutions? - offroaddieselhu - 07-31-2013

hi vgt turbo

http://www.youtube.com/watch?v=zC1uHsuhdSI