If your bike is Lambda-based you can run closed-loop when AFR is set to .981-1.02. In the case of older bikes like mine that are AFR-based, only 14.6 will allow closed-loop, but we have an additional Closed-Loop Bias table that will allow some deviation from 14.6. Not much, though.

 

I just order my PV and AT, can't wait until tuesday when they are supposed to arrive in the mail.. Looking forward to how well my 12 Fat Bob will be running with it.

 

Question for the PV guys. I'm considering the PV, but can't get myself to pull the trigger on it just yet. I only have pipes (2-2), and soon to be K&N intake kit and AC and want to adjust the lean issues.

Torn between just doing XIEDs (VIED) and this... (I know, one extreme to the other).

My question, will I notice a significant difference with the PV over the XIEDs since these are the only mods I have, and all I really need is to richen it up?

I definitely like all I've read on the PV, jsut trying to decide if it will be worth it for me. I like the idea of just plugging and flashing and removing it. Thanks in advance. Kevin

 

I should have mentioned it's a 2011 Street Glide. Thank you for the info!

 

The xied's cool the engine somewhat. No biggie however. Once I installed the PV, the engine lived up, definately more power and much smoother running. With the right tune, you'll never run the xied's again.

 

Any ideas yet, as I am having the same concerns....

 

cancelled

 

I'm well-known for my opinions on IED's and variants thereof, and I always try very hard to mitigate my responses to not come across as totally negative. It's just that these devices are nothing more than inexpensive resistors and do nothing but alter the signal from the O2 sensors to fool the ECM into thinking it needs to add more fuel. What none of the exponents of IED's will tell you is that they richen so much that the change goes beyond the physical capabilities of the O2 sensors and trips an ECM fault code. On most HD calibrations they are historical codes and won't cause the check-engine light to illuminate constantly, just as running a PCV will do when O2 sensors are unplugged (late-model calibrations only), but in the case of the IED the code represents an O2-sensor out-of-range condition. The O2 sensors become very inaccurate beyond a very narrow operating range, which goes down to about 14.4:1 and little more. When you force them to work at a lower AFR the voltage changes induce more AFR change, and the inherent precision of the devices is lost. The ECM isn't designed to run at 14.2, much less 13.8, in closed-loop mode.

Furthermore, IED's won't affect the open-loop area at all--i.e., above about 50% TP or 80-85 KPA. The benefit they may provide is a slight decrease in radiated engine heat from richer AFRs and a slight increase in part-throttle response, all at the expense of lower gas mileage. Going richer in the cruise range is not the panacea for reducing internal engine heat that some think it is. My own tests show that it affects ET and OT only very slightly, even when AFR changes are fairly radical. I run near-stoich (14.5-14.6) in the cruise range at all times and have no heat problems, other than those inherent to an air-cooled engine regardless of the tune. I will concede that there may be some benefit in radiated engine heat, i.e. the baked-leg effect, since EGT's are higher with leaner AFR's. So, IMO the cooling argument is weak, which leaves better part-throttle response as another benefit. I can run a very rich, performance-inducing AFR (13.0:1) in the cruise range and I can't tell the difference between that and my normal tune (14.5). So, how much of difference will they make? I say none, but certainly the benefit would be small, and if there was any at all would that be worth lower gas mileage?

All that said, IED's may have a small market justification for those with stock bikes, but once you go beyond a muffler change (e.g. Stage 1 AC) you'll need help with AFRs in the open-loop area.

The PV is a full-featured tuner but obviously costs more ($500 vs. ~$125). If you think the price disparity is too much, consider the PCV--as for $300 it does a very good job when a good map is installed. Just my 2˘.

 

any ideas on this yet, I am having similar concerns...

 

Hi: I have heard of a guy in the brazis bend area . fm 1462, that is suppose to be good with a dyno.
If interested let me know and ill find a business card.
Bryan