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Engine "bogging" down under hard acceleration when shifting
Posted: Wed Apr 13, 2011 3:29 am
by richieg888
My RS4's engine "bogs" down under full throttle when shifting from 2nd -3rd or 3rd to 4th gears....
If you give a second or a little breather before shifting it does not "bog" down and shifts perfectly... Is this normal?
I have tried researching and some people say it may be a defective or dirty MAF... Some people say its the traction control "kicking-in" protecting the tranny.... I have tried turning off the traction control and it seems to work but I still have doubts since the RS4 is a high performance car... Wasn't it made to be driven hard ?
Has anyone encountered this problem? Is this a possible early signs of carbon build up? hope you guys can shed some light ...
Richie
Re: Engine "bogging" down under hard acceleration when shift
Posted: Wed Apr 13, 2011 7:21 am
by P_G
You have suggested the answer, it is ESP limiting tyre slip and protecting the transmission coupled with throttle / torque limiter which is apparent in 1st/ 2nd/3rd. Switch ESP off and it will improve.
Re: Engine "bogging" down under hard acceleration when shift
Posted: Wed Apr 13, 2011 9:20 am
by Steve_C
P_G wrote:You have suggested the answer, it is ESP limiting tyre slip and protecting the transmission coupled with throttle / torque limiter which is apparent in 1st/ 2nd/3rd. Switch ESP off and it will improve.
+1, there was a thread on this a couple of weeks ago.
Re: Engine "bogging" down under hard acceleration when shift
Posted: Wed Apr 13, 2011 9:54 am
by richieg888
Steve_C wrote:P_G wrote:You have suggested the answer, it is ESP limiting tyre slip and protecting the transmission coupled with throttle / torque limiter which is apparent in 1st/ 2nd/3rd. Switch ESP off and it will improve.
+1, there was a thread on this a couple of weeks ago.
Thanks will review the thread of last week. Is it normal that when ESP is triggered that no ESP lights blink?
Re: Engine "bogging" down under hard acceleration when shift
Posted: Wed Apr 13, 2011 10:11 am
by P_G
If you press the ESP button then it will flash on and off, that is stage one disabled. If you press and hold the button for 5 seconds it is permanently illuminated which is stage two off. In the scenario you are describing only when the wheels actually lose traction will you see the light flashing, the system is proactively stopping this happening which is why you probably won't see it flash on a dry road.
Re: Engine "bogging" down under hard acceleration when shift
Posted: Wed Apr 13, 2011 10:23 am
by richieg888
P_G wrote:If you press the ESP button then it will flash on and off, that is stage one disabled. If you press and hold the button for 5 seconds it is permanently illuminated which is stage II off. In the secnario you are describing only when the wheels actually lose traction will you see the light flashing, the system is proactively stopping this happening which is why you probably won't see it flash on a dry road.
Cheers! for this
Re: Engine "bogging" down under hard acceleration when shift
Posted: Wed Apr 13, 2011 10:28 am
by richieg888
Steve_C wrote:P_G wrote:You have suggested the answer, it is ESP limiting tyre slip and protecting the transmission coupled with throttle / torque limiter which is apparent in 1st/ 2nd/3rd. Switch ESP off and it will improve.
+1, there was a thread on this a couple of weeks ago.
Tried looking for the thread acn't seem to find it. Would you happen to remember the tittle of the thread? or sahre the link?
Chers in advance !
Re: Engine "bogging" down under hard acceleration when shift
Posted: Wed Apr 13, 2011 10:31 am
by Steve_C
Re: Engine "bogging" down under hard acceleration when shift
Posted: Thu Apr 14, 2011 9:12 am
by Doug_S2
if you are too quick back on full throttle when the clutch switch is still engaged you can get a throttle cut. You also get this with a brake switch adjusted too close and the movement of the mounting points when your are using the clutch can make the brake switch operate.
