VRP 80mm TB & driveability issues
#26
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mine does the exact same thing with my RT stage 1. I thought it was software at first, but I think its mechanical. If I ease into the throttle holding it in 1st, it will jerk madly at 3500 or so RPM. If I get into it from a stop, it doesnt happen.
Also, my dyno's curves are all weird at the same point, so hopefully its the clutch causing it. Mine is a 2006 with 15K miles in it.
Also, my dyno's curves are all weird at the same point, so hopefully its the clutch causing it. Mine is a 2006 with 15K miles in it.
#27
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2015 S212
Now that is new. I have not had ANY of thos symptoms during decel. I was confused. If on decel, look into tranny as well. Good thing for me, Vadim looks into all that stuff. During the ECU tune, they did a bunch of work on shift points, etc. and it made a huge difference in the overal driveability of the car.
#28
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06 EuroElites E55
I never had this durring decel. If this is happining durring decel I will then take back what I said its not the SC clutch its something else. But I dont remember anyone sayin decel?
#29
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keep in mind that i'm talking about very low speeds where the transition between on/off throttle is minimal at best...like in crawling traffic. so this is not decel as much as it is simply going off throttle.
#30
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06 EuroElites E55
I will have to try that and see what my car does. as of right now I have the same exact symptoms as the OP. and I know for a fact that it is my clutch kickin in.
#31
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Here is a star read on the CEL i got
This is a response i got
If I read the report correct, the OBD2 codes stored are:
P2007 Intake Manifold Runner Control Stuck Closed
P2008 Intake Manifold Runner Control Circuit/Open
This is a response i got
If I read the report correct, the OBD2 codes stored are:
P2007 Intake Manifold Runner Control Stuck Closed
P2008 Intake Manifold Runner Control Circuit/Open
#32
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'01 Audi S4,'04 E55 AMG,'05 Audi A4
Just out of curiosity, can you run the throttle body through an adaption process on these cars? This type of behavior seems very reminiscent of issues that would crop up with modded DBW Audi's - and I believe they're running similar TBs, and I believe a similar Bosch Motronic unit. You can do it on an Audi by just turning the key to the on position for 30-40 seconds, or using a VAG-COM to run it through a throttle adaption process - not sure if theres an equiv. for these?
In my experience, when the TB needed to be "adapted" frequently, it usually had to do with the wire brushes in the actuator compartment getting oxidized - nothing a little rubbing alcohol/contact cleaner wouldn't fix. (I am however not advocating this for your TBs, as I do not have experience with issues on this car
)
In my experience, when the TB needed to be "adapted" frequently, it usually had to do with the wire brushes in the actuator compartment getting oxidized - nothing a little rubbing alcohol/contact cleaner wouldn't fix. (I am however not advocating this for your TBs, as I do not have experience with issues on this car
![Wink](https://mbworld.org/forums/images/smilies/wink.gif)
#33
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Thread Starter
Victor,
I will get some video of it asap. It happened about 5 times today all within a 2 mile drive. It definitely feels like the car falls flat on its face like the fuel was cut or TB slammed shut...nothing remotely like the jerky s/c engagement.
I will get some video of it asap. It happened about 5 times today all within a 2 mile drive. It definitely feels like the car falls flat on its face like the fuel was cut or TB slammed shut...nothing remotely like the jerky s/c engagement.
#34
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W211 E55
#35
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I never got it on video (yet). The car still hits a wall but its gone from like a 1 second gap to a 0.2 second gap - lame but not absolutely terrible like it was before.
I am battling with 150F IATs and need to work that kink out first.
I am battling with 150F IATs and need to work that kink out first.
#36
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W211 E55
I know it's a longshot, but have you checked your charging system?
If the ECU sees a low-voltage condition, it will turn off accessories, including the pump...
If the ECU sees a low-voltage condition, it will turn off accessories, including the pump...
#37
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The bucking for the most part has gone away. I have new issues to solve now... throttle position sensor perhaps (my 0-10mph is about 5 seconds! and 0-60 in 25 seconds) and my IATs go haywire to 150 F about 75% of the time.
#39
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E55 (for sale if the right offer comes along)...too many others to list
[QUOTE=Jakpro1;2714622]I had one of the first VRP 80mm TB's and have run K2 even longer without a lick of trouble.
+1
I still love that damn mod!
+1
I still love that damn mod!
#42
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I noticed this also with the 82mm tb,the s/c kicks in alot harder with less throttle input.You just have to learn how to drive the car different.I can make it engage without any one noticing if you really slowly give it throttle and once the s/c is on you mash it.
If I nail it I get the same jerk you guys are talking about.
If I nail it I get the same jerk you guys are talking about.