Gas vs PSD
Thread Starter
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Modular motor junkie
Joined: May 2009
Posts: 6,190
Likes: 8
From: Texas
Yea, thats one other nice thing about the V10. It has a very wide RPM range. It can pull anywhere from 1000 RPMs where its making 80% of its peak torque, all the way to the 4,600 RPM upshift. It will run to the 5,300 RPM limiter if I move the shifter to 2.
Postmaster
Joined: Apr 2006
Posts: 3,524
Likes: 2
From: CA Bay Area
Or he will not start at all. Just like already said several times, at certain load the engine will rev, but the truck will not move.
Cargo Master
Joined: Jan 2005
Posts: 2,413
Likes: 11
My psd pulls in it whole range to. That's something else I don't really understand. Is how more rpms=better towing. Well I could if the situation was that my power was in a rpm range that I could obtain, but my power is in my range. Oh well I guess somethings aren't meant for me to understand
Cargo Master
Joined: Jan 2005
Posts: 2,413
Likes: 11
Hey Bill let me if you can start out in 2nd gear.
For that matter I can start out in 3rd. I do it a lot when I'm loaded in loose or slick ground. I can put enough power to the ground to get moving but enough to break traction.
Thread Starter
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Modular motor junkie
Joined: May 2009
Posts: 6,190
Likes: 8
From: Texas
I know.
Ok, this is why your numbers are coming up wrong.
My first gear is 2.70.
Second on the 4R100 is 1.54
third 1
forth 0.71 OD
Its hard on the tranny to start off in a higher gear like that, but going down the road at speed with the TC locked it should not make any more heat than in third.
I will see if I can get a vid from a stop until it winds out, locked in second.
With 3.73s and 31" tires, its not too wound out at 65.
I've used a few calculators and plugged almost every possible combo into it. What I get w/ a gear of 2.20-2.82:1. That should cover your 2nd gear ratio. 27" -33" tire highth 3:73-4:30 rearend with 4600-5200 rpm I have speed range of 35-48mph. It just puzzles me how you can get 65 mph out of 2nd gear. I bet you won't drive in 2nd all day or pull for very long. I just tried to do it again and I noticed my transmission temp shot up to 190•. I think you burn your tranny up with to much of that going on.
My first gear is 2.70.
Second on the 4R100 is 1.54
third 1
forth 0.71 OD
Its hard on the tranny to start off in a higher gear like that, but going down the road at speed with the TC locked it should not make any more heat than in third.
I will see if I can get a vid from a stop until it winds out, locked in second.
With 3.73s and 31" tires, its not too wound out at 65.
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Lead Driver
Joined: Jul 2007
Posts: 7,868
Likes: 9
From: Rhode Island
Again as it turns out my truck is clearly different. I can start my truck in 2nd and get up to 40mph. I would think he could do the same, but then again he can drive 65 in 2nd so I don't know.
Hey Bill let me if you can start out in 2nd gear.
For that matter I can start out in 3rd. I do it a lot when I'm loaded in loose or slick ground. I can put enough power to the ground to get moving but enough to break traction.
Hey Bill let me if you can start out in 2nd gear.
For that matter I can start out in 3rd. I do it a lot when I'm loaded in loose or slick ground. I can put enough power to the ground to get moving but enough to break traction.
1.51:1 2nd with 4.10:1 rear gears and 31" tall tires with a redline of 5300 yields a top speed of 77. It will probably shift at 4500-4700 RPM - around 65 MPH.
Hmm indeed. How exactly are you managing to maintain the exact same rpm in the exact same gear at the exact same road speed, using two different rear end ratios?
In your V10 4.10 scenario you're either doing 68 mph or about 5100 rpm. Take your pick. The V10 "might" still pull 3rd gear with 4.10s at 75mph, but I don't know how long I'd want to stay there. How about you? Especially since it falls flat on it's face right about there.
And assuming your numbers are correct, which is suspect. I'm looking at independent dyno charts of both engines that tell a different story.
V10 - 4700 rpm HP- 240 RW TQ-260 RW
6.4 - 3100 rpm HP- 250 RW TQ- 420 RW
And assuming your numbers are correct, which is suspect. I'm looking at independent dyno charts of both engines that tell a different story.
V10 - 4700 rpm HP- 240 RW TQ-260 RW
6.4 - 3100 rpm HP- 250 RW TQ- 420 RW
Different dyno brands produce different results, and even the same dynos from the same company can produce different results depending on the fudge-factor the dyno operator puts in. I personally think both those dyno results are a bit suspect, when you consider the average 09+ RAM 1500 Hemi (Rated at 407 lb-ft) typically dynos at around 300 RWTQ, I find it hard to believe a 457 lb-ft V10 only dynos at 260 RWTQ
Postmaster
Joined: Apr 2006
Posts: 3,524
Likes: 2
From: CA Bay Area
Again as it turns out my truck is clearly different. I can start my truck in 2nd and get up to 40mph. I would think he could do the same, but then again he can drive 65 in 2nd so I don't know.
Hey Bill let me if you can start out in 2nd gear.
For that matter I can start out in 3rd. I do it a lot when I'm loaded in loose or slick ground. I can put enough power to the ground to get moving but enough to break traction.
Hey Bill let me if you can start out in 2nd gear.
For that matter I can start out in 3rd. I do it a lot when I'm loaded in loose or slick ground. I can put enough power to the ground to get moving but enough to break traction.
When I bought the truck, took me a while to get the feeling of lousy transmission shifter. So several times I started on 4th gear. The engine clunked loud for couple of seconds but moved with no other problems.
Cargo Master
Joined: Jan 2005
Posts: 2,413
Likes: 11
I know.
Ok, this is why your numbers are coming up wrong.
My first gear is 2.70.
Second on the 4R100 is 1.54
third 1
forth 0.71 OD
Its hard on the tranny to start off in a higher gear like that, but going down the road at speed with the TC locked it should not make any more heat than in third.
Ok, this is why your numbers are coming up wrong.
My first gear is 2.70.
Second on the 4R100 is 1.54
third 1
forth 0.71 OD
Its hard on the tranny to start off in a higher gear like that, but going down the road at speed with the TC locked it should not make any more heat than in third.
Looking closer I see why them trucks are fast. I don't see the pulling power with those gears. Again something else for me to dig into. Lol.
Now I don't see the v10s with the TS tranny doing 65 mph in 2nd cause it has the same gearing as mine.
Cargo Master
Joined: Jan 2005
Posts: 2,413
Likes: 11
When I run the numbers I come up with 66 mph top speed.
Lead Driver
Joined: Jul 2007
Posts: 7,868
Likes: 9
From: Rhode Island
1.51 x 4.1 = 6.191 Reduction ratio
5300 RPM / 6.191 = 856 revolutions per minute of the tire.
31" diameter. 31 x Pi = 97.34" Circumference
856 revolutions/minute x 97.34 = 83323 inches/min. Divide by 12 = 6943 feet/min. Multiply by 60 minutes = 416615 feet/hr. Divide by 5280 = ~78 MPH.
5300 RPM / 6.191 = 856 revolutions per minute of the tire.
31" diameter. 31 x Pi = 97.34" Circumference
856 revolutions/minute x 97.34 = 83323 inches/min. Divide by 12 = 6943 feet/min. Multiply by 60 minutes = 416615 feet/hr. Divide by 5280 = ~78 MPH.