Homebuilt Dynamometer?
Thread Starter
Staging Lane
Joined: May 2008
Posts: 85
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Yeah! We`ve been discussing it but i mean we have to build it more serious with wider ramps, and a platform around the whole thing! It sist on snow now so when it melts the rig will move so we have to wait with making it permanent..
Thread Starter
Staging Lane
Joined: May 2008
Posts: 85
Likes: 0
We are going to post the video! If it works it will be a fairly easy way and cheap to tune your car!
We are "never" going to get a true HP read out of that thing, but we are looking for a way to get a hp curve / torque.. Like a crank angle sensor from my 13b rotary engine mounted on a rotating point of the wheel. Then make a software to calculate the acceleration and make some sort of usable output. Havnt thought so much about how to get it working but if anyone got an ide it would be appriciated!
We are "never" going to get a true HP read out of that thing, but we are looking for a way to get a hp curve / torque.. Like a crank angle sensor from my 13b rotary engine mounted on a rotating point of the wheel. Then make a software to calculate the acceleration and make some sort of usable output. Havnt thought so much about how to get it working but if anyone got an ide it would be appriciated!
Teching In
Joined: Dec 2007
Posts: 41
Likes: 0
From: Spring, Tx
Yea we`re planning to mount a Eddy current brake (electromagnetic brake) on the input shaft. Im not sure what you mean with the torque beeing multiplied but as for the gearing it doesnt really matter as long as the brakes operate in the speed they are design to do they can just hold "soo much" power (watts (Horsepower).. With gearing the torque goes fex up and then the rpms down. The work beeing done is the same =)
This is a cool project!!!
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Staging Lane
Joined: May 2008
Posts: 85
Likes: 0
The diff. should reduce the amount of wheel torque (or speed) by the gear ratio at the input shaft. To simplify if the gear ratio is 2:1 (we know it's not but it make the math easy) then 1 turn of the input shaft = 2 turns of the wheels or in this case 2 turns of the wheels = 1 turn of the input shaft. Meaning the brake force at the input shaft would be multiplied (by the gear ratio) compared to a brake at the wheels. So the input shaft brake will do more work with less effort.
This is a cool project!!!
This is a cool project!!!
The tires are, actually, very close to 2:1, in that case the truck wheels will have half the speed of our cars. Im not affraid of having to high speed on the truck tires as i dont think we need to pass 200km/h (truck tires are rated to 100km/h with VERY high load)
Joined: Aug 2007
Posts: 24,241
Likes: 89
From: Turnin' Wrenches Infractions: 005
The diff. should reduce the amount of wheel torque (or speed) by the gear ratio at the input shaft. To simplify if the gear ratio is 2:1 (we know it's not but it make the math easy) then 1 turn of the input shaft = 2 turns of the wheels or in this case 2 turns of the wheels = 1 turn of the input shaft. Meaning the brake force at the input shaft would be multiplied (by the gear ratio) compared to a brake at the wheels. So the input shaft brake will do more work with less effort.
This is a cool project!!!
This is a cool project!!!
And yes breaking the input would work. You could weld on a brake rotor from a car/truck and actuate a caliper to stop it. It would have a huge advantage bc its breaking before the internal gearing.
Thread Starter
Staging Lane
Joined: May 2008
Posts: 85
Likes: 0
We were supposed to try tuning HerskerHans`s turbo ls1 silvia but the weather stopped us! Besides that we finnished the truck air brake controller. Not very complicated! Fixed airflow regulator into the brake actuators and adjustable leak out of the actuators! I will post a diagram soon!
It does not matter where the brakes are! It is basic physics... actuall the first law of physics that "energy can not appear or disappear". If the output of my car is 350KW.. 350kw is what i need to brake and turn into heat =)
If someone can explain this so everyone understands, please do, as i dont know how to explain it understandable..
Tried to search, didnt find anything..
It does not matter where the brakes are! It is basic physics... actuall the first law of physics that "energy can not appear or disappear". If the output of my car is 350KW.. 350kw is what i need to brake and turn into heat =)
If someone can explain this so everyone understands, please do, as i dont know how to explain it understandable..
Tried to search, didnt find anything..
Thread Starter
Staging Lane
Joined: May 2008
Posts: 85
Likes: 0
I got no idea! We can measure it but it isnt nothing we need to know.. If we need more brakes we`re adding eddy current brakes since the truck the axle came from had a ED brake. Its easy and brakes about 150kw alone
Joined: Aug 2007
Posts: 24,241
Likes: 89
From: Turnin' Wrenches Infractions: 005
We were supposed to try tuning HerskerHans`s turbo ls1 silvia but the weather stopped us! Besides that we finnished the truck air brake controller. Not very complicated! Fixed airflow regulator into the brake actuators and adjustable leak out of the actuators! I will post a diagram soon!
It does not matter where the brakes are! It is basic physics... actuall the first law of physics that "energy can not appear or disappear". If the output of my car is 350KW.. 350kw is what i need to brake and turn into heat =)
If someone can explain this so everyone understands, please do, as i dont know how to explain it understandable..
Tried to search, didnt find anything..
It does not matter where the brakes are! It is basic physics... actuall the first law of physics that "energy can not appear or disappear". If the output of my car is 350KW.. 350kw is what i need to brake and turn into heat =)
If someone can explain this so everyone understands, please do, as i dont know how to explain it understandable..
Tried to search, didnt find anything..
No it isnt. Braking at the wheel and braking the input of the rear axle are two completely different things. That general rule of physics isnt practical in every situation. It just doesnt apply directly all the time like you are trying to make it out. Good luck anyway.
Thread Starter
Staging Lane
Joined: May 2008
Posts: 85
Likes: 0
True! You loose around 10% from the engine to the wheels. I still have to waste alot of watts =)
EDIT: Nice with inputs! We`ve been discussing the energy losses etc with alot of people and nobody seems to agree hehe.. Just one way to find out!
EDIT: Nice with inputs! We`ve been discussing the energy losses etc with alot of people and nobody seems to agree hehe.. Just one way to find out!
Last edited by RexDiablo; Feb 22, 2010 at 03:45 PM.
