respond delay on electronic acceleration pedal
Hello & Happy New Year to all
I am not sure this is the right place to put this topic..
I have a G320 built 2006 & for the past year I have been taking part in trail ride races in Greece. I have noticed that the acceleration pedal has about 2 secs delay to respond when going very slow or from stop. I notice this more often when I am about to take a turn. I brake & slow down before the turn & when I hit the accelerator pedal again there is this 2 sec delay.
I read through numerous articles in forums that new cars with electronic accelerator pedals tend to have this delay. I installed a "sprint booster" on the pedal. When trying out it seemed like it was going to "kill" the delay. At the race I was still disappointed.
Does anybody know if there is a cure for this thing? I would suppose that professional racing teams would have a solution or the drivers just learn to drive with this delay (?)
Thank you
Hummmmm.............
The fly by wire accelerator and throttle system can have a slight delay in pick up, a certain amount of torque is reduced from the engine as the drivetrain takes up the power especially on automatic transmissions where the torque converter lock up clutch is controlled by the ecu using engine torque output information to allow the transmission to take up drive in a smooth transition and not to overload the internal components like the clutch packs and torque converter..
You also find that driving with the traction system active will also reduce power at take off, does your G have traction/esp(should have)
The sep/traction sytem when activated for slip control also reduces the engine output by shutting the throttle to reduce engine power.
You may have to erase/reset throtte and sensor adaptation and also torque converter lock up adaptation and re-adapt new values. This can only be done with star diagnose. A remap of the ecu might help.
Professional racing teams would have racing engine management systems and also racing transmissions, so the only way for you to compete with them will be be go race spec on your G! (G55K with 5 peed auto and modified transmission valve body with large throttle valve and modifed charger pulley....just to start with!)
The only thing that you can try at slow speed is to use the manual gear selection method as this will hold the gear and not try to match a gear for you. On take off you can select drive and foot on brake and slight accelerator to precharge the power and get the torque converter working, when the light goes green, just push the accelerater and release the brakes! WARNING: This method is used to test the trannsmission and warm the oil up, prolonged use will cause early wear and tear and damage over time!
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Thanks G Singh for that.
I forgot to mention that because of the esp, which makes this delay even worse I always drive in the races with the middle diff locked, so the esp is not engaged.
The delayed take off is not something that matters for me, but will keep in mind what you said.
For the erase/reset throttle & remap of the ecu I will have to speak with my Mercedes service guy about that.
I will try and use the manual gear selection, my only problem with that is that with this specific car I cannot change the gears correctly. I don't hear the engine at all & don't know when is the right time to shift. I've driven a few automatic cars with serial transmission but I always can drive them with the manual. Even other Mercedes models like the CLS. With the G class I can never hear the engine & therefore understand which gear I should use... but I think in the moment of the turn that i slow down by braking it would be easy to just shift to a lower gear & then press the acceleration & see if this delay continuous.