Any Guesses to HP Loss With Emission Control?

   #1  

K5lwq

Elite Member
Joined
Aug 6, 2017
Messages
2,696
Location
Mineola, TX
Tractor
Kioti LK2554, Branson 4815C, Satoh Beaver, Speedex
I thought this might be interesting to see what others think.

Tractor is a Branson 4815C with a claimed 48HP engine and 40HP at the PTO.

I had it put on a PTO dyno and it was producing 35HP at PTO.

I replaced DPF with a turbopack style performance muffler. Today I am having it tested again.

Any Guesses on the HP change?
 
  
  • Thread Starter
#4  
OP
K5lwq

K5lwq

Elite Member
Joined
Aug 6, 2017
Messages
2,696
Location
Mineola, TX
Tractor
Kioti LK2554, Branson 4815C, Satoh Beaver, Speedex
Coby, lunch on me next time I see you!

Stan, Branson does not have a computer. It uses a data logger that you simply unplug.
 
   #5  

Thunder chicken

Silver Member
Joined
Apr 4, 2019
Messages
186
Location
NW Ontario, Canada
Tractor
Kubota m7060
if it sounds louder, it ought to have at least 5 more hp and go 10mph faster!..... at least that's what the local kids think on their snow mobiles.

on a side note, i removes all the emissions (dpf and egr) from my VW tdi, with a computer retune have +40hp, +80ft/lbs torque, 10-15% better fuel mileage and am doing 20,000km oil changes vs 15,000 as the oil stays cleaner without that pesky EGR.
i think you're lucky to have that passive DPF on the branson rather than an afterburner like a lot of other vehicles. you can take yours apart and clean it too if you ever need to.
 
   #6  

CobyRupert

Super Member
Joined
Oct 30, 2012
Messages
5,159
Location
Washington County, NY
Tractor
JD 5075E
if it sounds louder, it ought to have at least 5 more hp and go 10mph faster!..... at least that's what the local kids think on their snow mobiles.

...but did he put a Flowmaster or Magnaflow (or whoever made muffler) sticker on the tractor? It's a well known fact in car & truck modifications that "Each sticker adds 5 hp, so you do the math"
 
  
  • Thread Starter
#7  
OP
K5lwq

K5lwq

Elite Member
Joined
Aug 6, 2017
Messages
2,696
Location
Mineola, TX
Tractor
Kioti LK2554, Branson 4815C, Satoh Beaver, Speedex
The answer is 1HP gain. But there is more to the story as torque increased by 70 ft lbs. That makes zero sense to me. But that is the results from the dyno tests.
 
   #9  

jaydee325

Veteran Member
Joined
May 21, 2013
Messages
1,014
Location
Casco, Mi
Tractor
John Deere X584 Garden Tractor & LS R3039H
Unless the tractor was dyno'd before and after mod, the results are meaningless. Original torque values were not provided in the original post, only HP values. We have no way of knowing how much torque changed.

A 1 HP change is within the margin of error. You could dyno it again on a different day with different atmospheric conditions and have less HP.
 
   #10  

RickB

Super Star Member
Joined
Sep 18, 2000
Messages
14,602
Location
Up the road from Dollar General WNC
Tractor
Just a Scag
Unless the tractor was dyno'd before and after mod, the results are meaningless. Original torque values were not provided in the original post, only HP values. We have no way of knowing how much torque changed.

A 1 HP change is within the margin of error. You could dyno it again on a different day with different atmospheric conditions and have less HP.

And if the shaft speed isn’t monitored and exactly the same when the hp value is recorded, all bets are off. We know nothing about the dynamometer’s capabilities. There are a lot of dynos at dealerships with a 4” analog gauge for output and a smaller gauge for shaft speed.
 
 
Top