Quote:
Originally Posted by Ultra RB
2008 Ultra, stock ECM, SE air filter, V&H Oval slip-ons, 61009 FuelPak, FP-1717 map.
Problem one was the lag in the throttle when starting off. V&H rep suggested changing mode 1 to 7 and mode 5 to 25 .... this has not eliminated the problem but helped a lot.
Problem two is popping on deceleration. V&H rep suggested changing mode 23 to 15 ... this helped but the amount of popping is still excessive. On another call to V&H they suggested that they could not adjust mode 23 any further down as it would result in engine stall on longer hill decelerations. The suggested that open exhaust systems tend to pop ... I suggested that this was not the case on my 95" build on my previous Ultra with a similar setup. Bottom line was there was nothing further they could adjust and to live with it.
Any suggestions on the decel popping issue?
Thanks,
RB
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Hi.
Well, V&H have been on the ball here, and I see they have done some fine tuning to the program.
I would suggest you try a couple things.
1) Check the exhaust for ANY leaks, even a small air leak can draw in air to the system, and they will cause popping.
2) Take your bike to a shop and have a dyno base line run done, make sure the tech does a WOT and part throttle and record the temps.
With this print out, Vance and Hines engineers can make a more detailed adjustment for your bike.
3) You must understand, there is a big difference between your last bikes FI system and your new bike. The old system was an open loop system that you could adjust far easier to run rich enough to tame down the popping, your new system not only has O2 control, it has an electric throttle, the ECM knows how rich or lean it is, and will try to bring it back to center (14.7:1).
Also, how you ride will have some control over popping as well, do you downshift to stop the bike or do you pull in the clutch and use the brakes?
Try using the brakes instead of the engine to stop, and I think the popping will go away.
