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#1
03-11-2012, 05:51 PM
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are you as obsessed as I am?
so i have a question has anyone has ever done this or watch this:
I have been watching and mapping my rpms to boost psi to speed in 4th gear... so at 2500 rpm - 4psi boost = 58mph flat level ground at about 900ft elevation, light to no wind. I started doing this on a quest for MPG and first noticed when i got a new caliper my boot levels dropped and my speed increased (waiting on mpg results). I was a little surprised at the all the changes ... so here is what i am talking about: hanging caliper: 3000 rpm -9psi = 65mph hanging caliper: 2500 rpm -7psi = 55mph hanging caliper: 2000 rpm -5psi = 42mph new caliper: 3000 rpm -7psi = 69mph new caliper: 2500 rpm - 4psi = 57mph new caliper: 2400 rpm - 3.5psi = 55mph new caliper: 2000 rpm - 2psi = 45mph now as for wind i am finding in head on winds at 25-30mph the boost levels increase by about 1.75 but speeds lower by 1-2, tail winds lower boost levels by about the same 1.75 and increase speeds by about 2-3.. also to put this into summery at 55mph with a hanging caliper i was getting 26-27mpg no matter wind or not, i have since fixed it and i am hoping for an increase in mileage as well. also I drive 90-95% on the highway with only 3 slowdowns in 35 miles of almost completely straight flat roads. my best to date MPG in this car was my last 10.5 gal fill-up at 325 miles or 31mpg... that was on a 75%wmo to 25%d2 black diesel.... i don't think this next tank is going to get the same with the 10.5 gal of d2 added... but we will see I have fresh filters installed as well so its a fair game...
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85 mercedes 300D-T 258k miles 
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#2
03-11-2012, 08:33 PM
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You give us all this bull and then don't have the good sense to list make and model and transmission of the car.
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Junqueyardjim Christianity, if false, is of no importance, and if true, of infinite importance. The only thing it cannot be is moderately important. C.S. Lewis 1983 Mercedes W123 240D 4 Speed 285,000 on the road with a 617 turbo, beautiful butter yellow, license plate # 83 240D INDIANA 2003 Jaguar Type X, AWD. beautiful, good mileage, Mom's car, but I won't let her drive it!
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#3
03-11-2012, 10:21 PM
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Well you asked so NO!
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1987 300TD 309, xxx 2.8.2014 10,000 mile OCI Be careful of the toes you step on today, as they may be connected to the ass you have to kiss tomorrow. anonymous “Be who you are and say what you feel, because those who mind don’t matter, and those who matter won’t mind.” Dr. Seuss
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#4
03-12-2012, 01:30 PM
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Makes sense...boost is pretty well correlated to engine load. Do you have time to watch for traffic while you're making all these notes?
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1981 Mercedes 300TD, 1994 Honda Civic Del Sol http://mefi.us/images/fuelly/smallsig-us/67195.pnghttp://mefi.us/images/fuelly/smallsig-us/103885.png
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#5
03-13-2012, 08:55 AM
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well my sig has my car listed as a 85 300d automatic
 ... as for watching traffic, i do have time as there are very few cars on the roads i drive on  ... and the more i watch, i am wondering why there is not a lockup torque converter installed? it seems to me it would help the MPG by lowering the RPMs in 4th gear...
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85 mercedes 300D-T 258k miles
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