Chassis dyno results
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From: IOWA
Chassis dyno results
I had the opportunity to chassis dyno my truck at a local diesel service provider. It was my first time doing this so I was a little nervous, but it was definitely a lot of fun. They crew running the show actually did everything for you, so I was able to stand back and watch. My mods are listed in my gallery, I was hoping for 300rwhp, but didn't quite make it.
278.77rwhp @ ~2750rpm
559.07 lb-ft @ ~2450rpm
Maybe it's just me, but the torque numbers seem to be kinda high on the rpm range, I would have thought the max torque would have been a little lower, more around 2000, but maybe it's because it's a V8. I know I6 (tractors and such) peak between 1700-1900rpm.
It was definitely worth it though, proved to me that all the mods I have been doing are paying off and I'm getting my money's worth for what I've put into it.
I just wish I was there earlier to watch a '98 Dodge turn out 525rwhp, that would have been a nice smoke show.
278.77rwhp @ ~2750rpm
559.07 lb-ft @ ~2450rpm
Maybe it's just me, but the torque numbers seem to be kinda high on the rpm range, I would have thought the max torque would have been a little lower, more around 2000, but maybe it's because it's a V8. I know I6 (tractors and such) peak between 1700-1900rpm.
It was definitely worth it though, proved to me that all the mods I have been doing are paying off and I'm getting my money's worth for what I've put into it.
I just wish I was there earlier to watch a '98 Dodge turn out 525rwhp, that would have been a nice smoke show.
Post Fiend
Joined: Feb 2006
Posts: 11,892
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From: Middle Tennessee
Where's the dyno sheet? Those are good #s at the rear wheels. Imagine what it would look like stock. Just curious about your hp and torque curve. My dyno sheet is in my gallery if you would like to compare the curves.
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Joined: Jun 2006
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From: Fulltime RVer
Originally Posted by farmb0y
I had the opportunity to chassis dyno my truck...
278.77rwhp @ ~2750rpm
559.07 lb-ft @ ~2450rpm
Maybe it's just me, but the torque numbers seem to be kinda high on the rpm range, I would have thought the max torque would have been a little lower, more around 2000, but maybe it's because it's a V8....
278.77rwhp @ ~2750rpm
559.07 lb-ft @ ~2450rpm
Maybe it's just me, but the torque numbers seem to be kinda high on the rpm range, I would have thought the max torque would have been a little lower, more around 2000, but maybe it's because it's a V8....
BTW, your 278.77 HP=532.4 ft-lb of torque, and the 559 ft-lb of torque=260.8 HP. Did you happen to watch the boost and EGT gauges and get those #'s? In general, HP=T*RPM/5252.
Post Fiend
Joined: Feb 2006
Posts: 11,892
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From: Middle Tennessee
Originally Posted by farmb0y
I have to scan it yet and then I'll post it. I wish your's was graphed off RPM instead of speed, it's hard to compare them otherwise.
Postmaster
Joined: Jun 2006
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From: Fulltime RVer
Originally Posted by Tenn01PSD350
Gene could figure that out. I have a 373 gear and 285s. Get busy Gene.
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Post Fiend
Joined: Feb 2006
Posts: 11,892
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From: Middle Tennessee
Originally Posted by ernesteugene
Can do, but I need the diameter of the 285's on the truck and aired up. For example, my stock 265's at 83 psi measure 31.6". The most accurate way is to measure the circumference, and divide by Pi=3.1416 to get the diameter. I'll use 3.73 as the diff ratio, and I'm assuming a direct 1:1 gear for the dyno run. I can run the spread sheet, and post a pic here, after I get the needed input on tire dia.
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Postmaster
Joined: Jun 2006
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From: Fulltime RVer
Originally Posted by Tenn01PSD350
So, go with 31 1/2 Gene.
The following 3 pics are the RPM vs MPH table for a 3.73 diff, 3rd gear (1:1), and 31.6 diameter tires. You can also calculate exact #'s using RPM=(39.6525)(MPH).