Discussion in 'Technical' started by gururajanv, Jun 2, 2010.
Fiat should mention it clearly in their website. Why this turbo lag in growing with Fiat global.
My average speed in MID is 19 kmpl, also once in a month I will go highway it's about 600-800 kms on a highway.
Disconnect the battery. Reset the ECU and then check.
perfect. this has become a regular exercise for me know.
i am yet to figure out at what instance the ECU picks up some strange data and after that the car looses the boost in low revvs. after the reset it becomes perfect.
once i get time i will do the investigations on my laptop and let everyone know.
my initial guess is the fuel. i have observed this when i shift from bharat petroleum to HP etc.
my 2nd suspect is the climate and AC parameters.
Here's a few tips on ecu resetting.
Plus, what is still an unknown variable till now is the choking up of the catalyst fitted right after the turbo in the Multijets.
Until and unless it is seeing temperatures high enough to burn the carbon soot deposited in it , it will keep getting blocked . And we will experience a corresponding decrease in performance.
Our daily city commutes do not provide for such high exhaust gas temperatures and pressures.
So , a nice thrashing once in a while will also help. i.e. Keeping the revs ,say 2000+ for atleast 7-10 kms continuously ( I'd personally prefer 3000rpm+ in say 3rd or 4th gear so that car speed stays in a safe limit ) . So that the catalyst sees some high temps and consequently burns off the carbon soot deposited in it. And that frees up the catalyst. And a free flowing catalyst = faster spooling turbo= more performance.
Are these top speeds at 4000 RPM ?
Whats the max RPM you can push the car too ?
@sid_10000: I just realised that you are talking about the TJet, and I am quite surprised. I haven't faced any issue yet on my TJet. When I exit my office basement (or even at malls), I have often stopped and started on the ramp with no stalling issues.
Whe I compare with my Esteem, I find the response of my TJET much better, and it does not vary whether there are 4 ppl in the car or only one (unlike the Esteem). I have had embarrassing episodes with my Esteem stalling in Mumbai when climbing with 5 ppl towards Powai from Ghatkopar side. Will probably get a better idea when I go to Lonavala this weekend.
I had presumed that the issue is with the MJD, as diesels do have an issue with starting torque.
Adding to the above point (Mods: I cant edit the earlier post any more), I often have a problem in close in traffic in the city when I am in 1st/2nd/3rd gear: if my foot is not on the brake, the car begins to accelerate - I think it goes to 15kmph or so on its own without any accelerator input in 2nd gear (~1000rpm), such is the low end torque of the car. So, I often have to shift to neutral and / or use my brakes to ensure I dont bang into the vehicle ahead.
@abk... I think this is because of the anti stall feature . The ECU controls it and the required fuel is automatically supplied so as to prevent stalling.
So is the case with the diesel.
Even the old Palio D has this feature. I once worked through all the 5 gears i.e. 1-5 with my foot off the accelerator pedal. By simply letting go of the clutch smoothly in every gear ; the car computer did the rest.
Technically, the ECU gives a bit of throttle input ; i.e it doesnt merely pump in extra fuel but acts as if we're pressing the pedal.
Separate names with a comma.