Mk3 6-Speed Tdci 130 1St/2Nd Gear Performance?
Posted 23 January 2013 - 12:18 PM
Then the snow came.
I'm not used to the car but it feels sluggish.
I dont think clutch is slipping. Revs seem controlled, accelerating up hill in 3rd (dont plan to do this often!)
I checked tyre pressure and it was low all round (3 tyres at 21psi and one at 25psi). I put them up to 36psi (Just a guess!) and it seemed a bit more responsive.
I'm not used to the car or diesel in general, is it right the rpm is a bit lower than petrol for a given acceleration.
I dont plan to abuse the car long term but my 1st and 2nd gear seem to max out around 25mph and , 45mph when accelerating hard. I was expecting a bit more from 2nd? But maybe the revs are playing with my mind.
I just want to understand if the Clutch/DMF has somehow affected performance, or if I'm just not used to how this model performs?
Posted 23 January 2013 - 12:22 PM
Posted 23 January 2013 - 10:27 PM
The RPM is much lower on a diesel than a petrol. You'll notice that your rev counter only goes up to 5k, whereas a petrol equivalent will go to about 7.5k. Another thing to watch out for with diesels if that if you have the clutch all the way off, and take your foot off the gas at low speed, you'll actually accelerate. This is normal, too - I'm only mentioning it because I've known people think it's a fault before.
My Mondeo is the 2nd diesel I've ever had - the first was my last car (Focus). I'd never go back to petrol now.
Posted 24 January 2013 - 03:25 AM
The mk3 diesel engine actually has a narrow powerband - useful power/ torque is mainly between 2k-3.5k / or 1.5k - 4k depending on model euro3 / euro4, pnumatic actuator / electronic actuator etc
the spacing of the gears has to be closer together in the lower gears than a petrol because of the narrow(er) powerband/ shorter "pull" - this "stretches out" in the higher gears at higher speeds eg - it will pull from 60-130mph in top (safely on an autobahn/ on track etc)(approx)(a difference of 70mph) but in 2nd only 15 to 45 iin 1st 0-25 etc
Probably no point in revving it over 3.5k through the gears - if you rev it to 3.5k in each gear, it will probably accelerate quicker
i find for to accelerate "off the line" if i "short shift" in from 1st to 2nd it is better (quickly changing it into 2nd without "flooring" it in 1st off the line) then you can "floor" it in 2nd, then 3rd etc, 45 is quite high for 2nd, i woukd have said 40 is about right
and as bigd has said, it will pull from 2nd from low speed (especially if you are coasting at 5-10mph/ or facing downhill)
Its just a different driving technique from a petrol car - you'r keeping it in a higher gear revving it less and changing earlier - and using the torque
You car will never be very quick off the line/ at lower speeds (so no point in "redlining" it in the lower gears) but is better in the midrange/ at low revs/ high gear on the motorway than a similar spec of petrol engined car
Posted 24 January 2013 - 07:20 AM
Posted 24 January 2013 - 05:05 PM
Posted 24 January 2013 - 06:20 PM
1st and 2nd also have the torque restricted to limit wheelspin. Most remaps simply lift this restriction, so the car feels faster.
switching off the esp will allow the car to wheelspin like mad
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