Dyno Programs
#1
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Dyno Programs
I have yet to burn my first prom as I am still reading and learning, but I was wondering about the helpfulness of programs like Desktop Dyno. I know they give a really good graph as to what kind of power curve the engine makes based on the cam lobe timing events.
I was thinking this may be a (correct me if I am wrong here) useful tool for the spark tables? I am not entirely sure on any of this yet but I thought if you understood where the engine starts making power you could incororate that into something.
Not that programs like that are 100% accurate but I was thinking it could be a tool for tuning? kind of like on a real dyno?
I was thinking this may be a (correct me if I am wrong here) useful tool for the spark tables? I am not entirely sure on any of this yet but I thought if you understood where the engine starts making power you could incororate that into something.
Not that programs like that are 100% accurate but I was thinking it could be a tool for tuning? kind of like on a real dyno?
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I've used a bunch of simulation packages. My favorite is Virtual 4-stroke by Optimum Power. I don't think you'll be able to afford such software and for personal use you could never justify it's cost. The advantage of the software is that it's within 5% all around if you enter in all of the parameters correctly. I've seen it as close as 1% of actual but it likes to over exemplify the anti-tuning peaks of exhaust. ANYWAYS... Desktop Dyno is okay for figuring out where you're vol eff peaks. Other than that, it's just a toy for wishful thinking. There software is very good with the vol eff curve when using equal length exhaust primaries.
So take the vol eff peak and input that into your starting eprom. It's a big shortcut.
So take the vol eff peak and input that into your starting eprom. It's a big shortcut.
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If you look at the VE tables there is a highest point, peak volumetric filling of the cylinders. Basically where your motor makes peak torque. Stock calibrations peak at lower RPM than say the zz4 or even a stock vette shortblock and a stealthram. The camshaft pretty much determines your peak volumetric efficiency and the rest of the parts resonate to either flatten your torque curve or peak it. With a v8 it's hard to get anything but a relatively flat torque curve. In a race engine you want maximum horsepower in your RPM range, hence the larger cams.... blah blah blah, back on topic.
If you use desktop dyno, use it with a grain of salt but it's useful in it's ability of determining the volumetric "curve" at 100-90kpa manifold pressure.
If you use desktop dyno, use it with a grain of salt but it's useful in it's ability of determining the volumetric "curve" at 100-90kpa manifold pressure.
#5
Programs like Desktop Dyno might be useful for infering WOT VE's as Jon said, but there's a lot more MAP columns on your tables than 100 kPa.
Also the VE's that are in your MAP tables are factored to suit the injector constant- they're not necessarily real VE's, although they could be.
John
Also the VE's that are in your MAP tables are factored to suit the injector constant- they're not necessarily real VE's, although they could be.
John
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Newbie deal here...
Where would one use the peak VE that DD2000 generates? Would it be used to change the VE% constants in the VE1 table? Honestly, how?
Where would one use the peak VE that DD2000 generates? Would it be used to change the VE% constants in the VE1 table? Honestly, how?
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Originally posted by jeepguy553
Newbie deal here...
Where would one use the peak VE that DD2000 generates? Would it be used to change the VE% constants in the VE1 table? Honestly, how?
Newbie deal here...
Where would one use the peak VE that DD2000 generates? Would it be used to change the VE% constants in the VE1 table? Honestly, how?
RBob.
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Ok I am slightly confused. What exactly is represented for MAP in kpa? what is 20 and what is 100? Is it relative pressure? Or actual pressure? And what is the conversion to bar?
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Okay...next question. i understand the concept behind the peak VE. How do I scale it into the BIN?
#10
Originally posted by scooter
Ok I am slightly confused. What exactly is represented for MAP in kpa? what is 20 and what is 100? Is it relative pressure? Or actual pressure? And what is the conversion to bar?
Ok I am slightly confused. What exactly is represented for MAP in kpa? what is 20 and what is 100? Is it relative pressure? Or actual pressure? And what is the conversion to bar?
100 kPa is roughly 1 bar.
Originally posted by jeepguy553
i understand the concept behind the peak VE. How do I scale it into the BIN?
i understand the concept behind the peak VE. How do I scale it into the BIN?
I used to think this was a good idea, but there's more than the 100 kPa column to worry about, as I said above. You might as well guess the numbers in, or try to find VE's from a similar engine's BIN, then go for a careful drive and have Winaldl tell you what the correction factors should be for the entire table.
John
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Engine Analyzer and Dragstrip Analyzer are both good programs.
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