GiulioEX125E

Hi everyone! Sorry if I write in english, but I'm Italian and I don't speak German, hope you can still understand and help me I'm looking for some dyno graphs of the exhaust Bullet M1X from Pipedesign. If anyone got it, I would apreciate if they could share it here. Also try to be precise about the setting of the tested engine, about timings, exhaust width, reed valve type, squish, compression ratio, ignition timing etc. Thank you in advance!

Actually I think he is saying that he wants the app from Sip, not the software from GSF and to be fair, I tried to find the Sip app some months ago but I couldn't find it. I think you can download an ".apk" file from google, but not the app directly from any store (like Google Play). Update: I'm trying to figure out how to use the ASCII file from gsf dyno, into excel to draw the same graph. Not so easy for someone like me, who has 0 experience with Excel eheh

That's something to start from, thank you! I'll have to start playing with Excel since I have no idea how to reproduce a graph from an ascii text file, but I don't think that's hard to learn. GSF Dyno isn't an app, it's a software. Here's the download link: http://atom007.heimat.eu/tmt/gsf_dyno_download.html There's also a SIP app which I think does the same as GSF Dyno, but I've never tried it so I can't tell you anything about it.

I get it, so I'll try to find a real dyno in my area (which seems to be allergic to real dyno's, to be honest haha) and see what I can do. Anyway, any idea about point n. 1 in my first comment?

Ok, I get it. But the road where I do my test runs is pretty much smooth, just like any "good" road. Sure, your argument is valid, but I don't think it makes SUCH a difference. As long as the road is "ok", the difference can't higher than 0.5-1 hp. Just like doing the runs while standing erect, or leaning towards the front for aerodynamics. If this makes SUCH a difference, then you also have to consider fuel quality for instance. Sure, it DOES make a difference, but it is so small that it's not relevant. I make my test on a nice smooth road, with basically 0% uphill/downhill (I also run both ways of course to reduce the variables), always in a regular riding position, without crouching, giving full throttle from around 3k rpm. Basically the only real way to make GSF Dyno more precise, is going to a real dyno and testing my vespa, then do a run on gsf with the same exact setup, and change the weight so that real dyno and GSF Dyno both show the same curve. I guess weight is the best parameter to "play" with, since it doesn't change the curves of the graphs, it just moves them up or down (same curve but 18 hp or 20 hp, for example). Sorry for the bad wording :) Any suggestion or tips about how to make the tests, in order to make GSF Dyno more reliable and precise, is welcome!

Road conditions is not a factor that determiens the vehicle power. My vespa has 20cv, it does not have 18cv if I ride it offroad where my wheel doesn't grip. Everything else about wheels is taken into consideration since GSF Dyno needs the tyre circumference, which is determined by wheel size, pressure, and the weight that it is holding. So if you measure your rear wheel while you sit on the Vespa, with the wheel at the pressure that you normally use, there should be no error. Exactly, if you take a Vespa and you do 3 dyno runs on 3 different "real" dyno's, the power will be 20cv, 21cv, 18cv for example. Like 1-1.5cv tolerance. This is exactly the same for GSF Dyno if it is setup properly, so I think that it CAN show the actual power, with the usual 1-1.5cv tolerance that EVERY dyno has.

Hi everyone! This is my first post so if it's not the right section, I would like the admins to move it where it belongs I'm Giulio from Italy, and I've been playing with GSF Dyno for some months to test varius things on my Vespa PX (177 VMC at the moment). I would like to ask you all for some help about this great software: 1) when comparing 2 setups (let's say, 2 exhausts), I usually do around 4 runs for each setup, then use the "mean" button to show the "average" graph. Now, if the setups to compare are more than 2, let's say like 3 or 4, this becomes very messy, because the lines on the left panel become too thin and impossible to read. Is there a way to avoid this? For example, being able to keep the "averages" graph only from the left panel, and delete everything else, this would be great. 2) I have this setup right now: VMC 177 alluminum (standard 114-171°), ported engine cases, si24, mazzucchelli crankshaft, intake timings are 120-70°, Megadella v5cl3. I'm trying different setups, but it runs around 18-19cv based on the setup I'm using, which looked like a normal average power, compared to similar setups tested on "real" dynos. But I never took the time to actually measure the weight of my Vespa, I just left the standard "200kg" value from GSF Dyno. Today I googled for it, it says 98kg. I also tried to measure the weight with a common weight scale, first I placed the front tyre on it, then the rear tyre, then I added the 2 weight. Its 35 + 60kg = 95kg, which is ok considering I don't have the spare wheel equipped. But GSF Dyno asks for "total weight" (in the guide it says Total weight [kg]: that's the weight of the vehicle plus everything what was loaded on (driver, petrol...)". So that should be 95kg + 74kg (my weight) = 169kg. So drawing the graphs again with the new 169kg (instead of the default 200kg), the software shows a power of around 16cv, which is kinda low in my honest opinion, since that's what a good old Polini 177 cast iron makes. What do you think? I think my current setup is in fact around 18-19cv, not 16. But the REAL weight of the Vespa + driver is 169kg. Any help will be greatly apreciated, thanks in advance (Also, please if you can, write in a "regular/official" German language, so I can use google translate to actually read the text, since I only know 2-3 words in German )