Power Vision users
Seasoned HDF Member
Joined: Jan 2007
Posts: 20,616
Likes: 4,440
From: anacoco, la
when you autotune, it doesn't matter what afr you have in any cell in your map, it sees your afr's as 14.6. once you've completed your autotune run and applied your changes, then your ecm will be making fuel changes based on the afr in the map and your o2 sensors (if in closed loop) or if your afr values are out of the range of the o2 sensors, you'll be in open loop.
i realize the above is greatly simplified and the pv can do so much more. but to put it in simple terms, it's as complicated as you make it. if you want it to be simple, flash and go, it can do that. it can also open up a rabbit hole that you can get lost in for days..... all depends on how much effort you want to put into it. i'm in the 'keep it simple' camp, so my knowledge barely scratches the surface.....
Last edited by skratch; Jul 23, 2015 at 10:32 AM.
Road Master
Joined: Jul 2010
Posts: 1,042
Likes: 86
From: Centeral Coast, California
yes, it's going to be hot during at. when you look at your map, the smaller the number, the richer the afr is. when you are autotuning, the pv is learning the specific characteristics of your bike and adjusting the ve tables accordingly. autotune does not make any timing changes.
when you autotune, it doesn't matter what afr you have in any cell in your map, it sees your afr's as 14.6. once you've completed your autotune run and applied your changes, then your ecm will be making fuel changes based on the afr in the map and your o2 sensors (if in closed loop) or if your afr values are out of the range of the o2 sensors, you'll be in open loop.
i realize the above is greatly simplified and the pv can do so much more. but to put it in simple terms, it's as complicated as you make it. if you want it to be simple, flash and go, it can do that. it can also open up a rabbit hole that you can get lost in for days..... all depends on how much effort you want to put into it. i'm in the 'keep it simple' camp, so my knowledge barely scratches the surface.....
when you autotune, it doesn't matter what afr you have in any cell in your map, it sees your afr's as 14.6. once you've completed your autotune run and applied your changes, then your ecm will be making fuel changes based on the afr in the map and your o2 sensors (if in closed loop) or if your afr values are out of the range of the o2 sensors, you'll be in open loop.
i realize the above is greatly simplified and the pv can do so much more. but to put it in simple terms, it's as complicated as you make it. if you want it to be simple, flash and go, it can do that. it can also open up a rabbit hole that you can get lost in for days..... all depends on how much effort you want to put into it. i'm in the 'keep it simple' camp, so my knowledge barely scratches the surface.....
Thread Starter
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Road Warrior
Joined: Jun 2014
Posts: 1,297
Likes: 57
From: N. IL
Thanks skratch!
In base form, The PV and auto tuning are not rocket science. Just trying to understand how riding style and temps are in my best interest when tuning?
Cliff takes a more conservative approach to things, most likely he is spending time on others projects and winding them up is not in his best interest.
You guys have helped so much, thou I feel there are some differences in opinion. Trying to accomplish the task at hand. 44mpg and temps under 250 during highway cruising. I make a bet I'm pretty close to those goals. When comfortable with this, I'd like to figure out how to get more power during the times I sweep the tach needle far to the right.lol!
In base form, The PV and auto tuning are not rocket science. Just trying to understand how riding style and temps are in my best interest when tuning?
Cliff takes a more conservative approach to things, most likely he is spending time on others projects and winding them up is not in his best interest.
You guys have helped so much, thou I feel there are some differences in opinion. Trying to accomplish the task at hand. 44mpg and temps under 250 during highway cruising. I make a bet I'm pretty close to those goals. When comfortable with this, I'd like to figure out how to get more power during the times I sweep the tach needle far to the right.lol!
Last edited by jt metal; Jul 23, 2015 at 11:13 AM.
Stellar HDF Member
Joined: Jan 2013
Posts: 2,747
Likes: 419
From: Vermont
Had my first glitch last night during a AT. THE RADIO shut down and said in diagnostic mode. Screen just went to not connected on PV Which it was. Did it again. Hope after 2 weeks the thing didn't go bad. Lol. My luck. Have to get out tonight
Cruiser
Joined: Oct 2010
Posts: 182
Likes: 13
From: Ohio
JT, I simply don't pay the bills with HD stuff, more or less we just take in a job here and there. Most of what we get are things that everyone else has taken a stab at, and been unsuccessful at it (because my labor rates are expensive most likely).
The bulk of what we do here is Quadrajet carburetors.
http://www.cliffshighperformance.com/
We surpassed 4000 units a few months back (been at if full time for the last 12 years), most full restorations, custom tuning for specific applications, and a good bit of Pure Stock, FAST Class, and SS and SA Drag racing. I venture outside that work here and there, not too many weeks go by someone doesn't bring a HD CV carb up here to tune, most of that is after drastic engine changes and nobody in their camp could nail down a decent result from it.
I write books as well, and work for the County when they need me (Chief CSI for the Coroner's Office). So my plate is full, and spare time limited, but I like it that way!......Cliff
The bulk of what we do here is Quadrajet carburetors.
http://www.cliffshighperformance.com/
We surpassed 4000 units a few months back (been at if full time for the last 12 years), most full restorations, custom tuning for specific applications, and a good bit of Pure Stock, FAST Class, and SS and SA Drag racing. I venture outside that work here and there, not too many weeks go by someone doesn't bring a HD CV carb up here to tune, most of that is after drastic engine changes and nobody in their camp could nail down a decent result from it.
I write books as well, and work for the County when they need me (Chief CSI for the Coroner's Office). So my plate is full, and spare time limited, but I like it that way!......Cliff
Road Master
Joined: Jul 2010
Posts: 1,042
Likes: 86
From: Centeral Coast, California
Bumpandrun: That's what the ECM does while doing an AT. Nothing going wrong there.
Thread Starter
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Road Warrior
Joined: Jun 2014
Posts: 1,297
Likes: 57
From: N. IL
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Cruiser
Joined: Nov 2014
Posts: 171
Likes: 7
From: Royal Oak, Michigan
Shortly after I got my PV2 (along with FM a/c, RC exhaust and external breather mod), I decided to take one long 2 hour AT session rather than a series of shorter ones...not sure why...some of it was impatience I guess, but I also felt that short runs would cause me to keep thinking that I'm auto tuning and therefore cause me not to ride the way I normally would. I did it in conjunction with a typical Saturday ride route to a favorite lunch stop. Got the bike warmed up to operating temperature and then loaded the FM custom map..."set it and forget it." I rode around town for the first 20-30 minutes, and then for the next 90 minutes I took my usual route to my lunch stop...interstate, 2-lane, another interstate and another 2 lane. I pulled into the restaurant parking lot, accepted the changes and rode for the rest of the day. When I checked mpg at the end of the day I was at 44 mpg and haven't touched the PV since. Not that I won't...I may add a FM Jackpot header in the next few weeks to help dissipate the right side heat. I thought about a cam...pre-Rushmore I had a SE 204 in my 11 SG...have read most of the cam threads here, but I think I'm happy with the Rushmore cam as it is.
A 2 hour long AT session may be unorthodox compared to what others have done, but I talked with Jamie about it and he thought I came out with a very good tune. My goal with the mods all along was a smoother running, freer breathing, less restricted engine optimized for fuel economy from stock (~37-39), not chasing horsepower and torque (took whatever I got in the process), so I'm happy with it.
Ron
A 2 hour long AT session may be unorthodox compared to what others have done, but I talked with Jamie about it and he thought I came out with a very good tune. My goal with the mods all along was a smoother running, freer breathing, less restricted engine optimized for fuel economy from stock (~37-39), not chasing horsepower and torque (took whatever I got in the process), so I'm happy with it.
Ron