quote:
Originally posted by John K:
Ok, Chris142, you asked for it. Now explain to a non truck driver what a brownie is. And why would you pick 2nd! And how hard is that to do the shifting you describe? Is it just a switch on the shifter or are you manipulating two shifters? I figure it must be a switch in order to actually beat out the two cars? Just curious.... Whatever it is, on a Peterbilt I bet it is expensive!
Ok the truck is a 62. Back in those days they had 2 transmissions. Mine has a 5 speed "main" and a 3 speed "brownie" or Auxilary trans.
The engine is governed @ 2200 rpm. Shifting from 2nd to 3rd in the main drops the engine 900 rpm.
There are 300 rpm difference between the 3 gears in the brownie.
Following this so far? The engine makes good power between 1500 and 2200 rpm.
So shifting the main brought my rpm's down to 1300rpm which is below the engines power curve.
Once in 3rd in the main I put the brownie in neutral, floored the "gas" pedal and slipped the brownie into 2nd which is "direct". Raising my rpm's up 600 rpm which put me @ 1900 rpm............Right where the turbo sings.
Run it up to 2200 and put the brownie in 3rd (OD)which brought the rpm's back down to 1900 and stomp on it again.
Shifting the brownie from 1 to 2 or 2 to 3 can be done as fast as you can move the shifter.
No need for 1st in the main w/o a trailer. i'd shift 8 times before I got across an intersection. 2nd and 2nd is about perfect, 2nd(main) and 3rd in the brownie is a little "high" but it'l really scoot once the clutch is out.
It's not as hard as it sounds. I've only got about 3 hrs shifting the thing and managed to figure it out.
Luckily I didn't have to go through any more gears since the parked cars were not far past the other side of the intersection.
The new trucks have lots of computer stuff which helps control emissions. They feel "lazy" untill the computer lets the fuel flow. My truck is mechanical. I stomp on it and it goes! Plus I was not pulling a trailer.
Here's the shifters. The main is near the seat and the brownie towards the pass seat.
[ March 14, 2006, 10:42 PM: Message edited by: Chris142 ]