de-accelerating??

bingstarr · 09-16-2005, 02:54 AM

my sales man gave me this flyer on decelerating my bmw at around 1200 miles. it states: "find a hilly road. drop into a lower gear and power up the top of the hill, let off the gas peddle and let the engine under load hold the car back going down hill. repeat for a few miles." he told me after i do this it should make my car more responsive and some what faster. has anyone ever heard of this??

wac77 · 09-16-2005, 03:41 AM

Quote:

Originally Posted by bingstarr

my sales man gave me this flyer on deaccelerating my bmw at around 1200 miles. it states: "find a hilly road. drop into a lower gear and power up the top of the hill, let off the gas peddle and let the engine under load hold the car back going down hill. repeat for a few miles." he told me after i do this it should make my car more responsive and some what faster. has anyone ever heard of this??

I say

Instead, find a hilly winding road and take it fast, then repeat a few times, faster each time. I don't think this would make your car more responsive, but should make you happy!

06graphite · 09-16-2005, 06:38 AM

Quote:

Originally Posted by bingstarr

my sales man gave me this flyer on decelerating my bmw at around 1200 miles. it states: "find a hilly road. drop into a lower gear and power up the top of the hill, let off the gas peddle and let the engine under load hold the car back going down hill. repeat for a few miles." he told me after i do this it should make my car more responsive and some what faster. has anyone ever heard of this??

that's just silly

davinet78 · 09-16-2005, 06:49 AM

i dont think there is any sense behind this theory

David328M-Sport · 09-16-2005, 07:31 PM

Quote:

Originally Posted by bingstarr

my sales man gave me this flyer on decelerating my bmw at around 1200 miles. it states: "find a hilly road. drop into a lower gear and power up the top of the hill, let off the gas peddle and let the engine under load hold the car back going down hill. repeat for a few miles." he told me after i do this it should make my car more responsive and some what faster. has anyone ever heard of this??

Sounds like fun to try it out. If it works, great, if it doesn't work, no harm done i suppose.

There are all sorts of ideas and advise as to how to extract as much from the engines as possible. Maybe some may help, while other may falter. As long as we keep those ideas in perspective and not do silly things with the car, we can have some fun trying anyway.

I keep my options open but not expect anything.

visor · 09-16-2005, 08:35 PM

Quote:

Originally Posted by bingstarr

my sales man gave me this flyer on decelerating my bmw at around 1200 miles. it states: "find a hilly road. drop into a lower gear and power up the top of the hill, let off the gas peddle and let the engine under load hold the car back going down hill. repeat for a few miles." he told me after i do this it should make my car more responsive and some what faster. has anyone ever heard of this??

Decelerating the engine under load (ie. in gear) produces pressure that supposedly helps properly seat the piston O rings for better compression and power.

arcrox · 09-17-2005, 07:08 AM

can anyone verify this? and/or possibly expound on it?

nrg09 · 09-17-2005, 09:07 AM

Good luck finding a quality HILLY road here in TX!

fredtoo · 09-17-2005, 11:04 AM

Actually, this is better during break in.

Climbing the hill under power produces more heat and pressure in the combustion chamber, which helps to seat the rings.

The process of seating the rings creates very small pieces of metallic debris.

Coasting down the hill in gear produces higher than normal vacuum in the combustion chamber. This helps to suck oil from the crankcase up into the piston ring area, and flush out the debris created by powering up the hill.

09-16-2005, 02:54 AM	#1
bingstarr Private 15 Rep 97 Posts Drives: alpine 2006 325 Join Date: Sep 2005 Location: norcal iTrader: (0) Garage List 2006 325i [0.00]	de-accelerating?? my sales man gave me this flyer on decelerating my bmw at around 1200 miles. it states: "find a hilly road. drop into a lower gear and power up the top of the hill, let off the gas peddle and let the engine under load hold the car back going down hill. repeat for a few miles." he told me after i do this it should make my car more responsive and some what faster. has anyone ever heard of this?? __________________ 325i alpine white black interior sports package Last edited by bingstarr; 09-16-2005 at 03:46 AM..
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09-16-2005, 06:49 AM	#4
davinet78 Lieutenant Colonel 28 Rep 1,832 Posts Drives: bmw e90 320d Join Date: Jun 2005 Location: gibraltar(europe) iTrader: (0) Garage List 2005 bmw 320d E90 [0.00]	i dont think there is any sense behind this theory __________________ e90 320d,arktis,lumber support, hifi speaker, alarm, dakota beige, 162 18", xenon with washer spray,window chrome trimmings, professional radio, 6 cd changer wood trimmings 6 speed manual.
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09-17-2005, 07:08 AM	#7
arcrox E90post addict 17 Rep 489 Posts Drives: 2024 G20 M340i Join Date: Sep 2005 Location: Scottsdale, AZ iTrader: (0) Garage List 2006 325i [0.00]	can anyone verify this? and/or possibly expound on it?
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09-17-2005, 09:07 AM	#8
nrg09 Private First Class 5 Rep 111 Posts Drives: honda& proud of it Join Date: Sep 2005 Location: Texas iTrader: (0)	Good luck finding a quality HILLY road here in TX!
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09-17-2005, 11:04 AM	#9
fredtoo First Lieutenant 15 Rep 340 Posts Drives: 325 328 350 Join Date: Jun 2005 Location: nj iTrader: (0) Garage List 1986 328 [0.00] 2006 325 [0.00]	Actually, this is better during break in. Climbing the hill under power produces more heat and pressure in the combustion chamber, which helps to seat the rings. The process of seating the rings creates very small pieces of metallic debris. Coasting down the hill in gear produces higher than normal vacuum in the combustion chamber. This helps to suck oil from the crankcase up into the piston ring area, and flush out the debris created by powering up the hill.
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