| Author |
Message |
Woody48348 (66.208.219.185)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, September 26, 2003 - 9:57 am: | |
I had Williams reprogram my 6V92T DDEC II horsepower from 300hp @ 1950rpm, to 350hp @ 2100rpm, and I can not notice any difference other than more speed, 6mph. I have been told the injectors have to be changed also. Is this true? I don't know what injectors I have now, the bus is an NJT Eagle.
Bob. |
two dogs (67.30.23.44)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, September 26, 2003 - 10:13 am: | |
sounds like they just increased your r.p.m.'s
easy for them,hope you didn't pay them a bunch |
woody48348 (66.208.219.185)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, September 26, 2003 - 10:34 am: | |
Two Dogs,
I only paid them $89.00, but I watched them download the program into my DDEC and the computer took the program.
Bob. |
woody48348 (66.208.219.185)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, September 26, 2003 - 10:45 am: | |
My only charge was $89.00 due to the compassion of the service manager in charge, however, I watched the technician as he uploaded the new program into my DDEC, and the computer accepted the program. Another Eagle owner suggested the throttle limiter needs to be turned off, and this may solve my issue.
Bob. |
Peter Broadribb (Madbrit) (65.37.90.139)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, September 26, 2003 - 11:27 am: | |
Check your tach and see if you are getting the 2100 rpms. If you are, then all has been done correctly. The throttle limiter is probably what I was told is a speed limiter and if your max speed went up then it appears it is not on.
Becareful what settings the put in as some will increase HP but decrease Torque. On my Series 60 DDEC II, I was told there are no injector options without major tuning by aftermarket companies, the computer does everything.
The throttle stop is a simple adjustment which is normally a Free service by Williams Detroit dealers and takes a few minutes with a Pro-Link 9000 with the correct card for the DDEC II.
Peter. |
madbrit (65.37.90.139)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, September 26, 2003 - 11:33 am: | |
Anyway, it would probably take that 50 extra HP and those 150 rpms to get the bus to go that extra 6 mph faster.
Peter. |
BrianMCI96A3 (65.41.249.60)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, September 26, 2003 - 4:01 pm: | |
I think madbrit has it nailed, as speed increases the penalty drag imposes increases dramatically, past a certain point you need to significantly increase HP and torque to show negligible increases in speed. I think a 6 mph increase from the 50hp 150
rpm boost sounds substantial.
Brian |
Henry R. Bergman, Jr. (Henryofcj) (63.224.197.10)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, September 27, 2003 - 2:56 pm: | |
I also wonder if they just reset your governor. Bet if you got the entire 50 hp increase, you would really feel the difference.
My Crown will go 85 mph with only 250 hp. Your MCI should run quickly up to 2100 rpm, then run out of rpm, not power to pull it.
My brother the fire captain once tried to get the local DD dealership to reset his fire engine's Detroit 60 from 500 hp to 650 hp.
The computer guy said he could retrieve/install the "military settings" (?) but would have to kill himself first before he reset...
...the engine because it would be highly illegal for a smog vehicle in California to run at such high settings.
Now I am wondering if there may be some sort of East Coast smog regulations that would prevent a DD dealership from upgrading older Detroits?
Anyway, with 350 hp, your MCI should feel much more peppy, particularly if you are familiar with the coach before and after. Good luck. |
Jayjay (198.81.26.104)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, September 27, 2003 - 10:13 pm: | |
You need to remember that an Eagle has the aerodynamics of a barn door, and that aerodynamic drag goes up by the square. i.e. with an aerodynamic shape it takes four times the HP to go twice as fast! (all else being equal) A barndoor on wheels reaally has a terrible drag penalty, and the faster you go the more critical drag becomes. I'll bet the Eagle outweighs the Crown by at least 10K lbs. too. I imagine final drive ratio is a contributing factor as well. If the rear end is fairly high,(numerically) then all of the HP in the world won't get much of a speed increase. Lots of factors involved in going faster, so good luck. I'd love to pick up 30% on my torque, and still keep my fuel burn. Wouldn't give a hoot about the HP. Cheers...JJ |
Tom Caffrey (Pvcces) (65.74.65.3)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, September 27, 2003 - 10:33 pm: | |
Jayjay, I think that the wind resistance climbs as the square of the speed factor. This would mean that doubling the speed would quadruple the wind resistance.
If that is true, then HP required would be 8 times at double the speed. These are the numbers that I have been using, and they are also how we know that the two stroke is inefficient on light loads. Mileage does not climb when we slow down much below 65 mph, but the drag drops a lot.
This is where I think that four stroke engines get the jump on the DDs; I think that on light loads the four stroke fuel consumption drops off much faster.
For what it's worth.
Tom Caffrey PD4106-2576
Suncatcher |
madbrit (65.37.88.114)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, September 28, 2003 - 10:04 am: | |
Also, you have to take into account that a Series 60 11.1 like mine has 350hp and 1350 ft/lbs of torque. Whereas most 2 strokes I have seen, that have 350hp, only have around 750 ft/lbs.
That extra 600 ft/lbs, sure does a lot of grunt work.
Peter. |
Gary Carter (68.24.218.112)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, September 28, 2003 - 1:02 pm: | |
My 8V92TA DDEC has 500HP and 1470 ft/lbs of torque and yet gets close to 7 mpg pushing 45,000 pounds down the road.
BTW changing the HP should not effect top speed unless you did not have enough power to reach it before. Once you reach the govenor's max RPM extra HP/torque will buy you nothing except the ability to level out the hills. |
Johnny (67.241.166.182)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, September 28, 2003 - 9:18 pm: | |
"My brother the fire captain once tried to get the local DD dealership to reset his fire engine's Detroit 60 from 500 hp to 650 hp."
*jaw hits floor* |
FAST FRED (67.75.113.122)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, September 29, 2003 - 5:39 am: | |
For those that desire the least service life and best defuling ability the marine engine specs are avilable.
Usually much higher than truck , engines seldom last 1000 hours after this (if used at full tilt) , but what a ride!
The 500hp DD series 60 can be bumped to 750 HP !
For a while,
FAST FRED |
Geoff (Geoff) (66.238.120.186)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, September 29, 2003 - 9:56 am: | |
A 6V92TA at 350HP has 1020 ft lbs of torque, and an 8V92TA set at 350HP would have 1250 ft lbs of torque. But those readings are at 1200 rpm, does anyone know the peak torque rpm of the Series 60? |
Neo/Russ (66.119.33.171)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, October 04, 2003 - 11:29 am: | |
Geoff,
My '96 spec book shows the peak torque always at 1200, however the charts show that on some settings that it lays flat to 1280 rpm and yet others holds 1450 ft. lbs to 1800 rpm. Just depends on programming. |