Using the "M" button during runin period

Jet Mech · 08-18-2011, 08:50 PM

Drive it like you stole it and shift after 5500 rpm...foot to the floor for the first 1200 miles.

andrews · 08-18-2011, 11:32 PM

What's the reasoning behind varying the throttle?

Picking up the car for PCD and then driving across the country will mean lots of boring highway driving where I expect to be doing the same speed and same RPMs.

Mid Life · 08-19-2011, 12:22 AM

Quote:

Originally Posted by andrews

What's the reasoning behind varying the throttle?

I Have heard that before. Apparently its better for an engine during the runin period to have varying loads and revs as much as possible. I just change down a couple of cogs every so often then work back up through the gears when I'm on the freeway.

Redlyne_mr2 · 08-19-2011, 01:28 AM

Hard break in is what it's all about. I've never been a fan of soft break ins. I don't bag on the car day in day out but it gets driven past 5500 on occasion. The sooner the rings can seat the better the car will be.

as7920 · 08-19-2011, 01:41 AM

Quote:

Originally Posted by Jet Mech

Drive it like you stole it and shift after 5500 rpm...foot to the floor for the first 1200 miles.

Don't you mean drive it like an unscrupulous service technician?

Dackelone · 08-19-2011, 03:05 AM

Quote:

Originally Posted by andrews

What's the reasoning behind varying the throttle?

Picking up the car for PCD and then driving across the country will mean lots of boring highway driving where I expect to be doing the same speed and same RPMs.

You want to generate some vacuum while in gear. Doing so at say 4K or so - is goood for the rings and valves to "seat" properly.

The worse thing you could possibly do is hit the highway and set the cruise control! EVEN if you must drive the highway... IF you could be in a lower gear 4th or 5th and varry your rpms AND load (vacuum) that would be good. Try to varru your speed too. Or... just take some back roads for the first few hundred miles.

as7920 · 08-19-2011, 06:24 AM

Quote:

Originally Posted by Dackelone

The worse thing you could possibly do is hit the highway and set the cruise control! EVEN if you must drive the highway... IF you could be in a lower gear 4th or 5th and varry your rpms AND load (vacuum) that would be good. Try to varru your speed too. Or... just take some back roads for the first few hundred miles.

Oh dear. Is it too late to go an thrash mine now after 2500 miles?

08-18-2011, 08:50 PM	#23
Jet Mech First Lieutenant 66 Rep 306 Posts Drives: 2011 1M Coupe VO Join Date: Mar 2011 Location: Nowhereville iTrader: (1)	Drive it like you stole it and shift after 5500 rpm...foot to the floor for the first 1200 miles.
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08-18-2011, 11:32 PM	#24
andrews Private 12 Rep 96 Posts Drives: VO 1M Join Date: Jul 2011 Location: Redmond, WA iTrader: (0) Garage List 2011 BMW 1M [0.00]	What's the reasoning behind varying the throttle? Picking up the car for PCD and then driving across the country will mean lots of boring highway driving where I expect to be doing the same speed and same RPMs. __________________ -Andrew S.
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08-19-2011, 01:28 AM	#26
Redlyne_mr2 Private 12 Rep 68 Posts Drives: 1m, mr2 turbo, Land Rover Join Date: Aug 2011 Location: Calgary iTrader: (0)	Hard break in is what it's all about. I've never been a fan of soft break ins. I don't bag on the car day in day out but it gets driven past 5500 on occasion. The sooner the rings can seat the better the car will be.
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