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Author Topic: mc5 fuel economy - yic  (Read 5935 times)
gus
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« Reply #15 on: January 26, 2009, 01:58:22 PM »

I think you just answered your own question!

DD are known for quick starting.

Your new one doesn't??

Tuneup??
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Len Silva
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« Reply #16 on: January 26, 2009, 02:03:34 PM »

Well, there's a clue.  A good running Detroit will start on the first turn in reasonable weather or even in cold weather with a block heater.  Hard starting indicates a problem.  55 MPH would not be acceptable to most of us.  If the engine is running right and the torque converter is locking up properly then it must be the rear.  
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viento1
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« Reply #17 on: January 26, 2009, 03:28:40 PM »


When you say tune up are we talking about new injectors and 12 hours labor?

Thank you,  by the way...
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viento1
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« Reply #18 on: January 26, 2009, 03:54:18 PM »

I just heard back from the guy I bought it from. He says the coach always had that lousy speed and the loss of power was directly related to the transmission. He also told me the injectors are 55s and the motor was gone over when the tranny was insalled.

I have to say that I am still not happy with the performance, there must be something wrong yet. Rear end? tune up?

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VanTare
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« Reply #19 on: January 26, 2009, 04:03:56 PM »

Viento1    talking with the shop guys they say run from your buddy Al injectors for a non DDEC 8v71 should be about 60 dollars ea and take no more than 8 hrs install and rack adjustments   

David
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John316
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MCI 1995 DL3, DD S60, Allison B500.




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« Reply #20 on: January 26, 2009, 04:42:39 PM »

All I can say is, I love our S60 with a Allison B500. It will do 80 up to 85 easy...It accelerates really well too...

I don't think that helps much. But my point is, I wouldn't like 55mph. It just wouldn't be acceptable for me.

God bless,

John
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MCI 1995 DL3. DD S60 with a Allison B500.
Ed Hackenbruch
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« Reply #21 on: January 26, 2009, 07:57:21 PM »

Do you just let the tranny shift by itself?   I manually upshift mine when i hit 2000 to 2100 rpm and i downshift when it drops to 1500 rpm.  Don't know top speed but would love to find out Grin....know it will do  over 80 with throttle to spare.  55 mph is a real tough speed for me because  it wants to go from 3rd into 4th at 55 to 57 mph.  If i keep it in 3rd at 55 i am running 2000-2100 rpm and if i shift it into 4th and try to stay at 55mph i am lugging it at about 1550 rpm. I have to get it up to about 62-63 mph before i am running at 1650 rpm.  1700-1750 rpm puts me at 70 to 73 mph.
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wvanative
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« Reply #22 on: January 26, 2009, 07:59:23 PM »

All I can say is, I love our S60 with a Allison B500. It will do 80 up to 85 easy...It accelerates really well too...

I don't think that helps much. But my point is, I wouldn't like 55mph. It just wouldn't be acceptable for me.

God bless,

John
  Dang, thats going to leave a red mark right between the eyes Shocked   LOL John thats funny.

WVaNative
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steve5B
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« Reply #23 on: January 26, 2009, 08:38:22 PM »



  I'll add to the post, heading west on HWY 74 out of Cincinnati  last summer I passed two tractor trailers, also East bound a

   Indiana State Trooper.  I thought when I passed the tractor trailers they were running below the posted 70 MPH. Looked back

  and noticed the Trooper was now heading my way with his lights on.  Looked again and the trucks were way behind me, and lo

  and behold I had a visitor.  Long story short.........104 in a 70.  Had no idea a bus , especially mine would run that fast.  As for

  the engine size 8V-92 Spicer 4 spd.  Believe it or not it sips fuel at those speeds.


   Steve 5B....
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viento1
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« Reply #24 on: January 26, 2009, 08:40:00 PM »

Do you just let the tranny shift by itself?   I manually upshift mine when i hit 2000 to 2100 rpm and i downshift when it drops to 1500 rpm.  Don't know top speed but would love to find out Grin....know it will do  over 80 with throttle to spare.  55 mph is a real tough speed for me because  it wants to go from 3rd into 4th at 55 to 57 mph.  If i keep it in 3rd at 55 i am running 2000-2100 rpm and if i shift it into 4th and try to stay at 55mph i am lugging it at about 1550 rpm. I have to get it up to about 62-63 mph before i am running at 1650 rpm.  1700-1750 rpm puts me at 70 to 73 mph.

Mr Hackenbruch I believe we have an understanding. Maybe we could have a bus rally at the track?? you know, spice things up a bit.

by the way, I have been letting the auto do the work, It seems to shift at max rpm so manually shifting would not help much.
« Last Edit: January 26, 2009, 11:00:36 PM by viento1 » Logged

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viento1
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« Reply #25 on: January 26, 2009, 08:45:39 PM »



  I'll add to the post, heading west on HWY 74 out of Cincinnati  last summer I passed two tractor trailers, also East bound a

   Indiana State Trooper.  I thought when I passed the tractor trailers they were running below the posted 70 MPH. Looked back

  and noticed the Trooper was now heading my way with his lights on.  Looked again and the trucks were way behind me, and lo

  and behold I had a visitor.  Long story short.........104 in a 70.  Had no idea a bus , especially mine would run that fast.  As for

  the engine size 8V-92 Spicer 4 spd.  Believe it or not it sips fuel at those speeds.


   Steve 5B....

OK you are not invited to the track!!!

but seriously. Steve just confirmed that I am not loosing my mind. That is some crazy speed but my old bus would just cruise too, I remember before I installed the integral steering I had to keep it at 140km so that it would track

Same questions for you fuel economy? injector size? rear end ratio? shift points?
« Last Edit: January 26, 2009, 08:49:32 PM by viento1 » Logged

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gus
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« Reply #26 on: January 26, 2009, 09:11:28 PM »

No matter what the PO tells you I'm not convinced because you still haven't addressed the hard starting.

DDs start on the first crank. If not something is wrong.
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viento1
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« Reply #27 on: January 26, 2009, 09:22:17 PM »

Gus, I agree with you 100% my list of things to do is now...

set up tach
solve starting, power and poor fuel economy
figure out as much as I can about what to expect from a tune up and do as much as I can myself.
set up my bus similar to my new friends so I can enjoy similar performance
change all my fuel filters
change my air filter
replace light bulb (not that exciting but on the list non the less)

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niles500
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« Reply #28 on: January 26, 2009, 09:54:31 PM »

Viento - you really should have a jake switch - If your jakes are always on your losing some coasting ability there - HTH
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TomC
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« Reply #29 on: January 26, 2009, 10:49:29 PM »

55 injectors are going to give you the best fuel mileage.  With careful driving, you could change to 60 injectors and still get about the same mileage with the added bonus of a bit more horsepower.  Change to 65 injectors, and you'll have more power, but with a definite fuel mileage loss and possible smoking.  55 injectors will give you 257hp and 677lb/ft torque.  60 injectors with give you 280hp and 738lb/ft torque.  65's will give you 304hp and 800lb/ft torque.  70's (with proper timing) will give you 318hp and 860lb/ft torque-and that's about the end of injectors for a none turbo engine.  Turbocharge and aftercool the engine and the same 65's will give you 325hp and 975lb/ft torque, 70's will give you 350hp and 1050lb/ft torque, 75's will give you 375hp and 1125lb/ft torque (this is what my engine in my bus is set at and the performance is quite noticeably better-fuel mileage about the same [5-6]), 80's will give you 400hp and 1200lb/ft torque-and that's the last factory setting that Detroit had with the 8V-71TA.  You can go with 90's that will give you 450hp and 1350lb/ft torque, but I doubt the engine would last much past 200,000 miles (course, that could be a lifetime of driving for some of us).  Good Luck, TomC
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