RPM speed while in highway cruise mode
05-20-2009, 09:44 AM
#11
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My Ride: 2009 535xi, short shifter, no CDV
Technology getting advanced and I can not image diesel can rev. to 5K rpm nowadays.
Diesel require to have more rigid(thick) cylinder body and heavy pistons.... This is due to the much higher compression ratio. ( 22:1 and BMW might be more since it is a BMW .... , I did not check, just image )
If you rev. too high, the engine itself will explode.. (I mean if engine management did not put limiter there)
Diesel require to have more rigid(thick) cylinder body and heavy pistons.... This is due to the much higher compression ratio. ( 22:1 and BMW might be more since it is a BMW .... , I did not check, just image )
If you rev. too high, the engine itself will explode.. (I mean if engine management did not put limiter there)
Originally Posted by BLooD' post='883187' date='May 19 2009, 10:59 AM
nope my desiel redlines at 5000rpm
05-20-2009, 09:55 AM
#12
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My Ride: 2007 530i. Purchased 6/28/07. Titanium Silver Metallic, Black Dakota Leather, Dark Poplar Trim, Steptronic, Premium Package, Cold Weather Package, Bluetooth, Adaptive Control Xenons. 10/30/07 Added OEM 124s with 245/40/18 & 275/35/18 Michelin Pilot Sport A/S tires. Installed red Cal Covers� from BavAuto. 11/21/07 Added OEM all-weather floor mats (for winter, carpet in summer) and coat rack. 6/26/08 installed M5-style rear spoiler. 6/30/08 put on red reflectors. 8/22/08 Euro turn signal stickers applied. 3/20/09 Installed Shadowline Trim. 3/27/09 Added Matte Black Kidney Grilles from Trinity. 4/03/09 Installed Bimmian Shadow Matte Black 530i Badges. 4/04/09 Installed LED license plate lights from Trinity. 5/01/09 Installed Brabus Interior LED Kit and White Angel Eyes. 5/02/09 Put in Brabus 6K Fogs. 5/14/09 Removed charcoal filter. 5/15/09 Installed light smoke LED side marker lamps from Trinity. 5/21/09 Sprint Booster. 6/12/09 Painted exhaust tips flat black. 6/13/09 Pulled red Cal Covers and painted calipers low gloss black. 6/27/09 RPI Ram Air Scoop from Trinity. 8/15/09 Installed Brabus's silver invisibulbs front and rear. 9/24/09 Installed R-Dash license plate LEDs from Brabaus (John).
Gotta be more of a gear ratio issue since I've owned cars from 4 to 8 cylinders in various confgurations (I4, Flat 6, V8, I6, etc.), and the rpm at cruising speed 70-75 did not correlate directly according to displacement.
05-20-2009, 10:21 AM
#13
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My Ride: Volvo V70 D5 Summum
Resently owned a
530D -05 Orentic Blue
Sport Seats and Sport steering wheel.
My 530D -05 runs 2000rpm at 75mph on the sixth gear.
It Seams to be a heigh rpm for a 525 if thats the car you have.
It Seams to be a heigh rpm for a 525 if thats the car you have.
05-21-2009, 12:29 PM
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My Ride: 2005 BMW 545i Sport Package, Jet Black
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Originally Posted by Kzang' post='883287' date='May 19 2009, 03:44 PM
My current car is a 6 speed manual and the Mustang GT was a V8.. not a V6.
I'm wondering if it has to do with a larger engine? Maybe the 550i or 545i had lower RPM range when cruising at 60 - 70 mph?
I'm wondering if it has to do with a larger engine? Maybe the 550i or 545i had lower RPM range when cruising at 60 - 70 mph?
fyi my car's RPM is 3000 at 100 mph. (with v8). Before i used to have 525 and with 3000 rpm's i was going 80 mph. Talking all about cruising speed
05-21-2009, 01:06 PM
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Originally Posted by vlad_b' post='885821' date='May 21 2009, 04:29 PM
yes it is different. with v8 rpm's will be lower then with v6 at the same cruising speed. logicaly thinking: to pruduce same amount of push, 8 people will use less effort then 6 right? same with cylinders.
fyi my car's RPM is 3000 at 100 mph. (with v8). Before i used to have 525 and with 3000 rpm's i was going 80 mph. Talking all about cruising speed
fyi my car's RPM is 3000 at 100 mph. (with v8). Before i used to have 525 and with 3000 rpm's i was going 80 mph. Talking all about cruising speed
Since your old 525i had 3K rpm at 80 I guess mine is normal then.
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