smokeyco75
Member
Anyone have an online dyno that you like to use? I have never played with one before.
virtual dyno
- Thread starter smokeyco75
- Start date
smokeyco75
Member
Ok. I figured they would have that software figured out by now.
Oh yea, well you know that's right then.
choppedtop
Well-Known Member
When I had my cycle shop, I had software for a computer dyno. It allowed you to change cams, compression ratios, venture sizes on carbs, gearing etc. It kind of got you in the ballpark, but not really close to what a real dyno would tell. The good part of it was that you could make changes, such as cams, carbs, exhaust, comp/ratios, and see what differences each made. It would at least let you know which way to go for what you were wanting.
On my m/c, it showed about 8 to 10 hp more than the bike was making on a real dyno. I was more concerned with torque than hp. It did help me in making my cam choice on the first attempt, along with the pistons, and valve sizes.
Lee
On my m/c, it showed about 8 to 10 hp more than the bike was making on a real dyno. I was more concerned with torque than hp. It did help me in making my cam choice on the first attempt, along with the pistons, and valve sizes.
Lee
I have one but it's not online. I used it when I was building my Mopar 440 and I think it was pretty close to real world (within 25-30 hp/tq). There will always be variations and the numbers are never absolute. There can even be large differences between real dynos depending on how they are set up...
Mike
Well-Known Member
There is a lot more that comes into play than just the software, itself. And that is where the problems begin. Variables like carb inlet temperature, humidity, barometric pressure, specific gravity of the fuel being used, brake specific fuel consumption and exhaust gas temperatures are just some of the variables a piece of software cannot take into account. And all of these things come into play when tests are being conducted. Dyno software can show you relative changes, but it is never going to deliver accurate numbers.
And believe me, I've seen dyno sheets where the operator has used some, or all of those variables to tweak low numbers into something that really wasn't there. I've seen dyno sheets where the tests were apparently being run in the eye of a Category 5 hurricane, and nothing is an easier way to 'make' power than to pull the hat temperature sensor and let it drape down near the headers, to run inlet temperatures way up. I actually read a dyno sheet from what was then one of the biggest names out there, and the barometric pressure that had been input before the pulls was 26.80.
Aye.
Right.
ellis8500
Member
Performance Trends has a free trial of their software which is used by all of the NASCAR engine builders and many of the teams to simulate engine design changes. It is very detailed and the results are within a few percent of what the real engine will do. It's expensive to buy but can be used in it's full version for a 10 day trial. Once you start playing with it, the hours will fly by as you investigate the affects that various changes have on the engine performance characteristics.
http://performancetrends.com/Engine-Analyzer.htm
http://performancetrends.com/Engine-Analyzer.htm
Similar threads
