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Title: rotax e85 tuning Post by: k0mpresd on July 19, 2015, 08:50:02 PM so i am very virgin when it comes to e85, as in, i didnt even know it was available where i live until a few days ago.
attempted an e85 tune on the seadoo today. 900cc, 3cyl. 11:1 CR ratio. i reference this post: http://nefariousmotorsports.com/forum/index.php?topic=7913.msg72544#msg72544 which i didnt find out until later, should actually be 9.76 stoich for e85, and was told SG is 0.79. anyways, that lowers the calculation by 5% to 1.36 or 36% increase. i ended up with a file that has 41% added to krkte and fkkvs. this made for easy starting, good idle, and good power. though, power only seemed to be about what the pump gas file would make, even with several additional degrees of ignition added. there is no o2 sensor. only map, iat, and egt. yes, i will be adding a wideband as the next thing i do but for current testing, there is no WB available. attached ignition and lambda maps. any suggestions are more than welcome. my main wonder was what most people run for lambda and ignition on higher CR motors. Title: Re: rotax e85 tuning Post by: vwaudiguy on July 20, 2015, 10:51:55 AM power. though, power only seemed to be about what the pump gas file would make Curious as to how you measure results? GPS maybe? Title: Re: rotax e85 tuning Post by: k0mpresd on July 20, 2015, 11:35:32 AM rpms. more power = more and faster rpm spool up.
Title: Re: rotax e85 tuning Post by: k0mpresd on July 20, 2015, 01:55:08 PM added 12.5% to KFFWL, seemed to help with cold start.
before would stumble a bit. now it seems to be as smooth (which is still a wee bit shaky) as a cold gasoline start. Title: Re: rotax e85 tuning Post by: Gonzo on July 20, 2015, 04:08:42 PM Torque limiter maybe?
And cold start on E85 always requires a bunch of extra fuel Title: Re: rotax e85 tuning Post by: Divune on July 21, 2015, 11:38:04 PM This is interesting, what year and any mods to run e85? I have an 04 rxp with small add ons, thing rips.
Title: Re: rotax e85 tuning Post by: k0mpresd on July 22, 2015, 07:59:20 AM Torque limiter maybe? And cold start on E85 always requires a bunch of extra fuel all the torque limiters at this point should basically all be off. and yes, i added a bit more fuel to warm up, cold cold start had just a small stumble when it first started. Title: Re: rotax e85 tuning Post by: k0mpresd on July 23, 2015, 11:51:20 AM cold start is still a little meh.
raised some parts of kfzwop and seemed to get a bit more torque out of the motor. |