The MegaSquirt Project has experienced explosive growth other the years, with hundreds of new MS installations occurring every week - a phenomenal success! MegaSquirt has been successfully used in all aspects of Internal Combustion engine applications including R&D, Industry, Race, and Research. The MS project has transformed itself from a simple R&D project into a full-featured mature engine control system. To reflect this the support structure has also changed to meet the needs of MegaSquirt Users.
Moving forward, the R&D forums for MegaSquirt project are in a read-only mode - no new forum posts are accepted.
However the forums will remain available for view, they still contain a wealth of information on how MegaSquirt works, how it is installed and used. Feel free to search the forums for information, facts, and overview.While the R&D forum traffic has slowed in recent years, this is not at all a reflection of Megasquirt users, which continue to grow year after year. What has changed is that the method of MegaSquirt support today has rapidly moved to Facebook, this is where the vast majority of interaction is happening now. For those not on Facebook the msextra forums is another place for product support. Finally, for product selection assistance, all of the MegaSquirt vendors are there to help you select a system, along with all of the required pieces to make it complete.
Forum for discussing Tuner StudioMS tuning & datalogging software.
Forum rules
Read the manual to see if your question is answered there before posting. If you have questions about MS1/Extra or MS2/Extra or other non-B&G code configuration or tuning, please post them at http://www.msextra.com The full forum rules are here: Forum Rules, be sure to read them all regularly.
S.Bretz wrote:Your point of spinning tires and getting on over estimated out put is errelivant as that case would fall under the guides of "not using the tool properly."
Most cars where the owner cares about power will spin the wheels in second when you put your foot flat to the floor, even from a rolling start. If your foot isn't flat to the floor you aren't measuring maximum power.
You could do the run in 3rd or 4th, but then you've just introduced a far larger wind resistance (wind resistance is proportianal to V^2) and so will undershoot actual horsepower.
This isnt a way that will get you HP numbers, but the way i used to get my tune right on my honda was to make a pull in 3rd from 4k rpms till it hit the chip, then i'd see how long it took in the datalog to see if i was making a hp improvement.
Im sure theirs a way to calculate horsepower based on a rate of acceleration, combined with gear ratios and wind resistance and vehicle weight. I just dont know how.
This isnt a way that will get you HP numbers, but the way i used to get my tune right on my honda was to make a pull in 3rd from 4k rpms till it hit the chip, then i'd see how long it took in the datalog to see if i was making a hp improvement.
Im sure theirs a way to calculate horsepower based on a rate of acceleration, combined with gear ratios and wind resistance. I just dont know how.
This isnt a way that will get you HP numbers, but the way i used to get my tune right on my honda was to make a pull in 3rd from 4k rpms till it hit the chip, then i'd see how long it took in the datalog to see if i was making a hp improvement.
Im sure theirs a way to calculate horsepower based on a rate of acceleration, combined with gear ratios and wind resistance. I just dont know how.
S.Bretz wrote:Your point of spinning tires and getting on over estimated out put is errelivant as that case would fall under the guides of "not using the tool properly."
Most cars where the owner cares about power will spin the wheels in second when you put your foot flat to the floor, even from a rolling start. If your foot isn't flat to the floor you aren't measuring maximum power.
You could do the run in 3rd or 4th, but then you've just introduced a far larger wind resistance (wind resistance is proportianal to V^2) and so will undershoot actual horsepower.
YOu would want to do it in 3rd or 4th gear..its better for datalog to pick up more accurate numbers as the rat of the acceleration of the rpms it less....and yes, there is wind resistance, but you can also calculates that based on the crossestional ares of the front of the car.
If its accuracy that you are loking for, then this is not for you....what it is a decent means of creating something that it pretty consistant. ALl you need to do is find a safe stretch of road and o a couple pulls after modification have been made....what you are looking for really is more a change in the shape of the power curve, not you peak numbers genrated.....but agian that would fall under the guides of know how to use a tool, or not to.
Your point of spinning tires and getting on over estimated out put is errelivant as that case would fall under the guides of "not using the tool properly."
Most cars where the owner cares about power will spin the wheels in second when you put your foot flat to the floor, even from a rolling start. If your foot isn't flat to the floor you aren't measuring maximum power.
You could do the run in 3rd or 4th, but then you've just introduced a far larger wind resistance (wind resistance is proportianal to V^2) and so will undershoot actual horsepower.
YOu would want to do it in 3rd or 4th gear..its better for datalog to pick up more accurate numbers as the rat of the acceleration of the rpms it less....and yes, there is wind resistance, but you can also calculates that based on the crossestional ares of the front of the car.
there was a piece of software called "streetdyno" i believe that did all of this already, it just needed a couple of inputs. Both myself and ian (http://www.qksltwo.com) ran this and it proved to be pretty accurate.
there was a piece of software called "streetdyno" i believe that did all of this already, it just needed a couple of inputs. Both myself and ian (http://www.qksltwo.com) ran this and it proved to be pretty accurate.