| From | Message |
crow318
Dodge Dakota
JOIN HERE
8/31/2005
09:24:17
|
 Subject: Drive Train Loss
IP: Logged
Message:
Yesterday I took my truck to the dyno for a little tuning. What I am looking for now is an accuate driev train loss % so I can get a decent idea of my engine HP. I have the 44RE tranny and the NV231 HD transfer case.
And I hate to be rude, but please don't answer if you are just guessing.
|
Mikes99Dakota
GenIII
8/31/2005
11:53:35
| RE: Drive Train Loss
IP: Logged
Message:
I believe in mine I have the auto 44re tranny and it was like 22% loss.
1999 RC Auto 5.2L
Mopar PPH, Magnaflow 3"/Cut-out, K&N FIPK, Viper Electric Fan Kit, 3.90s/Suregrip
Track Times: 60' - 2.163
1/8 - 9.53 @72.19 mph
1/4 -14.89 @91.24 mph
|
ticats
Dodge Dakota
JOIN HERE
8/31/2005
16:40:35
| RE: Drive Train Loss
IP: Logged
Message:
22.5% when I did a dyno quite awhile ago.
ticats, ontario, canada
97 Dak CC Sport, 5.2L, 44RE, pb 13.76 @ 99.65
|
Guesses
Dodge Dakota
JOIN HERE
9/01/2005
15:02:02
|  RE: Drive Train Loss
IP: Logged
Message:
How did you guys come up with those specific #s ? I've heard most autos around 25%, most manuals around 15%, the more efficient 45RFE around 20%.
|
ticats
Dodge Dakota
JOIN HERE
9/01/2005
15:55:01
| RE: Drive Train Loss
IP: Logged
Message:
Software used by most dyno. shops calculate it out based on the results of your dyno. run.
|
Kowalski
GenIII
9/01/2005
18:50:23
| RE: Drive Train Loss
IP: Logged
Message:
That's interesting - how would they be able to calculate it out when the dyno only measures power after the drive train loss ? Or do you mean the info is in the software from someone who previously dynoed an engine with and without the specific transmissions attached ?
Lead, follow, or get out of the way
|
crow318
Dodge Dakota
JOIN HERE
9/02/2005
15:45:37
| RE: Drive Train Loss
IP: Logged
Message:
There is something called a negative dyno run, I'm not sure how it works, but thats supposed to give you your drivedrain loss. If I had heard about that before I went, I would have asked.
I would imagine its similar to when we balance movable bridges. We measure the resistance in both directions to determine the rolling resitance of it.
|
Kowalski
GenIII
9/02/2005
16:51:57
| RE: Drive Train Loss
IP: Logged
Message:
Thanks, hadn't heard of that before.
Lead, follow, or get out of the way
|
ticats
Dodge Dakota
JOIN HERE
9/03/2005
06:54:42
| RE: Drive Train Loss
IP: Logged
Message:
> ... a negative dyno run ...
Drivetrain loss is calculated by the operator doing a normal dyno. run then getting off the gas, not touching the brake pedal and letting the motor bring everything to a stop. The info. gathered is used to calc. the loss.
|
sicminds
GenIII
9/05/2005
21:05:18
| RE: Drive Train Loss
IP: Logged
Message:
does a transgo shift kit help out on the drivetrain loss or does it just help in the shift.
|
Eye_Trip
Dodge Dakota
JOIN HERE
9/05/2005
23:08:03
| RE: Drive Train Loss
IP: Logged
Message:
When a shift is made, 2 gears are engaged at the same time momentarily. The amount of duration is how it makes it smooth. A shift kit will shorten the duration, there for less power is lost in the shift and more is put to the ground. coincidently it also helps lowers the trans temps.
The result is small in HP gains but big on less friction.
|
| | P 1 |
|
Post a reply to this message:
Username Registration: Optional
All visitors are allowed to post messages
|
