1993 Mercedes w124 diesel modifications

[SkauneJohan]

Originally Posted by GreenTDI

Do you notice more soot emissions now the EGR is disabled? Off course, it triggers internal pollution, but EGR also helps warming up the engine faster and it's needed for the regeneration of the particulate filter. But I recon your car doens't have such a thing .

only notice a lot better running, if i had more time i would clean the intake from EGR goop aswell, gonna change it later anyway...

soot is invisible in rear mirror just like before, only notice a little gray haze during startup(like before) if weather conditions and lighting are right

she gets warm just like before after about 3km(2 miles) for pretty warm and fully warm at 5-6km (3.5-4 miles) only notice cooler running when fully warm in traffic, no more seeing temperature needle rise a lot during idle wich probably is because of the removed throttle plate(more air)

EGR function is to lower combustion temperature to reduce NOx--make the burning cooler, how this is supposed to help warming up engine is a riddle to me

and yes no such thing on this car

Originally Posted by jakobnev

Are you planning aero mods?

no plans for this at the moment atleast, bit did change wheels to more aerodynamic

[GreenTDI]

Originally Posted by SkauneJohan

EGR function is to lower combustion temperature to reduce NOx--make the burning cooler, how this is supposed to help warming up engine is a riddle to me

When the hot exhaust fumes are recirculated at a cold start/cold engine, it will help warming up slightly. Not with every car, sometimes the EGR is deactivated untill operation temperature is reached, to improve smooth running.

[cRiPpLe_rOoStEr]

Originally Posted by GreenTDI

When the hot exhaust fumes are recirculated at a cold start/cold engine, it will help warming up slightly.

Not only the heat reintroduced to the intake stream, it's also worth to notice the lower density of the recirculated gases compared to fresh air makes it lighter for the engine to compress.

[SkauneJohan]

I am actually thinking of making rear wheel skirts, think they look cool

here is picture of how she looked like when i got her with 16 inch wheels



and how she looks like right now with 15 inch wheels



still trying to get time to change the springs, lots of rain now so the helpful dude has no lust to change them untill the weather gets better LOL

[cRiPpLe_rOoStEr]

I'm not a fan of rear wheel skirts, but anyway, seems like those hubcaps were already somewhat of an improvement regarding aerodynamics too.

[SkauneJohan]

I have been noticing how she constantly runs better since removal of the throttleplate

there are two hills on my way to work wich before this mod i had to give full throttle else i could not make it to the top, well not anymore : now i can back of the throttle before reaching the top

And I am also noticing more free revving engine, on the stretch of motorway while keeping throttle steady at 85km/h, the slight downhill going north resulted in my speed reaching 105km/h

[cRiPpLe_rOoStEr]

Originally Posted by SkauneJohan

I have been noticing how she constantly runs better since removal of the throttleplate

The only time something analogue to a throttle plate in a Diesel engine would be desirable is the "emergency flap" fitted to some stationary and marine engines in order to choke them in case of a sudden engine runaway.

[SkauneJohan]

Originally Posted by cRiPpLe_rOoStEr

The only time something analogue to a throttle plate in a Diesel engine would be desirable is the "emergency flap" fitted to some stationary and marine engines in order to choke them in case of a sudden engine runaway.

Exactly

[cRiPpLe_rOoStEr]

On a sidenote, some newer engines have been fitted with an electronically-controlled throttle plate due to emissions compliance, in order to allow a higher rate of warm EGR flow. Seems to make more sense than the mechanical-link throttle plate you had, even though it might enable a somewhat similar effect with fewer precision.

https://www.youtube.com/watch?v=GXQPsAW-iZA

[SkauneJohan]

so now with four fuel fillups, 80 liters(21 US gallon) and 1290km(802 miles) since the removal of throttle plate my avarage consumption has been 6,16liter/100km or 38.2 US MPG

seems like a trend on friday it is time for the next fillup, exciting to see what it will be by then