Now this is interesting...

Took my Xfire in to Wullenweber for the first oil change/service @ 4,000 miles. When I get it back...it is faster. Not at the low end but above 3,000 rpm hits a "strong spot" and then pulls real hard right up to red-line.

I'm banging up against the rev limiter whereas before I hardly ever did.

Do these cars have a "break-in" mode for the first 3-4 thousand miles ?

I've been following the LX forums and the owners of 300C/Magnum/Chargers report a noticeable power increase after a few thousand miles. Could this be a Benz/Bosch ECU programmed thing ? Perhaps activated after "X" many miles or the first service visit ? I know there is a "crossover" valve which opens in the intake to change the tuning at about 3000 rpm. Is this what I'm feeling ? Perhaps this valve is programmed to open late or not at all the first few thousand miles during the break-in or maybe the top end timing is slightly retarded to limit peak Hp/torque ?

I know I'm not imagining this...there is an obvious difference now !

I've read about Magnum owners picking up .3 - .5 seconds in the quarter and a long-term test of a BMW Z4 in Road&Track reported an almost half second e.t. improvement from brand new. This is my first German car, could this be some Bosch Kraut Komputer Kontroller thing ?

Cincinnati Slim

 

yes there is a break in mode, check the owners manual for more details.

 

All engines tend to "loosen up" as the moving parts get to know each other better. I most German machinery I have encountered, this happens at around 30,000 miles. My guess is that the dealer reset your throttle calibration and it switched from Granny mode to aggressive mode. Do a search on this forum for the procedure. It literally takes two minutes to do.

 

Downloaded the '06 manual.

All it says regards the break-in is basically "no special treatment is needed ...no full throttle starts ...or max speed runs for the first 1,000 miles".

But I know this is not in my head. This car feels about two tenths (quarter mile e.t.) faster. And I know about resetting the "drive-by-wire" system.

I do it every time I fill-up.

Hey, not complaining. It's just when I hear statements like "the Crossfire is not really fast", hey, I've had a bunch of muscle cars and hotrods over the years...MY Crossfire is pretty darn fast. I guess these is a fair amount of car-to-car variation. We've had a number of 4.0 Jeep Cherokees over the years and for some reason the Black '96 sitting in my garage now is a bunch faster than the others were. It'll run mid fifteens in 80 degree heat even with 152K miles on the clock. Yep, that ones a KEEPER !

Slim

 

Once I hit about 10k in mine man it really woke up for some reason. It's got a little more growl to it too. I used to granny it cause it was a pooch and now it's a speed demon and I can barely keep it from spinning the tires pulling out from intersections sometimes lol. I don't know what's up with it but I like it!

 

time to bring this thread alive again. =p

bobs I did a search and all I came up with is: this.
Is this what your talking about? Edit: it seems like something only a technician can do at a dealership, and nobody really knows what it is, correct?

 

bump bump bump.

 

I noticed a more aggressive but slightly inconsistent and jerky throttle response when I reset the adaptation values in the ECU after fitting a new MAF. It all settled down again after couple of days after it had readapted. Perhaps the dealer reset the values for some reason.