Finally got my FXR2 back from Rosa's Cycles on long island, NY. I was expecting this, as the owner asked me what cam I had when I checked on the status. He said it had a "dip" down low. He wasn't kidding. Now I did ride it today, and it does feel like it takes off like a turbo once you break 3krpms, and I can't really say it feels like it lost anything it had before I did the cam and pipe, so I'm not too concerned. but if I can do something to bump up that dip, I may, only because I like to cruise at around 2800.
Like I said, it screams above 3k, so I'm not crying. The AFR looks a little rich down low too, I'm thinking there may be correlation?
correct on the 48 the ratio between the 48 /190 is the go to, the 58 would have dipped the HP and torque on the pull and you would have seen it
Looking at the charts, it does have a pretty big dip. Seems that in conjunction with the seeming too rich AFR in the same RPM range would suggest a smaller slow jet, right?
Too rich is leaving power on the table. Too lean is leaving pistons on the table. It is safer to be too rich than too lean, but yeah, that's what your problem is for the dip.
WTF when running the 89" stroker that was easily a 100/100 engine, it had a 50 and 205 giving a 13.8 down low and 13.2 full throttle. My AFR's would slightly go rich when the accel pump would hit but cleaned up quickly with a live AFR gauge running. That chart is falling off the table pig rich and will cause a torque tip, if you run it up to 3000 rpm getting off the low speed jet it will run great but hitting it low requires cleanup time from over rich condition.
So am I getting this right? Since it’s a WOT dyno pull, the main jet is the problem?
Main jet is the 13.6 and fine for your compression, make sure it is 48 low jet in it like John and everybody else is saying, hope it is a mistake on the paper. A 48 will be rich enough down low to do what you need and the main is good for power right now.
Main jet is the 13.6 and fine for your compression, make sure it is 48 low jet in it like John and everybody else is saying, hope it is a mistake on the paper. A 48 will be rich enough down low to do what you need and the main is good for power right now.
Right, but I'm trying to address that low rpm tq drop and rich AFR, if not the main jet, and if not the slow jet, what if anything is left to adjust to get rid of the overly rich condition?
05-13-2018 | 04:55 PM
Funky Dyno results
