> Given the weigh and size, that's certainly not bad.
you are very kind!
> their overall diameter is a lot smaller
i'm precisely aware of that
Euromod, Pivoslaw [i think the pronounciacion could be this way
]
OF COURSE motor pumping is not needed.
i suspect that you think the smaller diameter tyres are by chance.. or worse - by wrong reasoning.
I engineered it due to the long gear changes [my gearbox is manual].
With bigger [brand numbers'] tyres I couldn't change to the next gear earlier:
3rd could propel the car only from 50km/h upward
4th could propel the car only from 70 km/h upward
so I had to ride the vechicle with 2nd gear in curved streets
and ride 3rd in long lines..
very reeeving.. not pleasant.
Big torque - yes, but what it was for in easy driving?
so.. the the solution was not m'em bigger, but smaller
to make next gear go earlier.
tyre calculator was my friend and workshop guys were
openly distrustful and unwilling to confide what am doing [and cooperate also
].
And now:
3rd can propel the car from 40km/h
4th can propel the car from 60 km/h
Have I modified the gearbox?
in functionnal manner - yes i have modified the transmission factor.
I have not increased the revs, i've leaped them down.
i am a electrical engineer with phd in economic optimization [that's a fact]. hihi
so tuning things is close to my interests.
I haven't checked GPS, but it is a good idea.
>>I thought MB 190 sedan can also easily have such roof extender.
>The results on a sedan are less than on a car with a rear hatch like Piwoslaws 206SW.
i see..
I thought how to make the extender, how to glue it
- there is an opening along the window rubber - it could help.
Does the front windshield side fence make the additional drag?
It is a pocket -like one [very stylish but very draggy..?].
I think it can.
From other mods:
- i have changed oil in gearbox and transmission to leaner one [as lean as in automatic gearbox - nearly water] and add super-antifriction additive [not ptfe, not fat, glutty oil type].
- the same oil additive to the engine - less friction and a lot cleaner oil now.
- have changed motor oil from 10W40 to 5W30 - leaner one. These days the oils have so high grades: "SJ" "SL"
Works well.
Thank you for your posts! hope my is also of interest.