why does everyone change the MAP PE enable higher with cam?
07-30-2005, 10:53 PM
#1
why does everyone change the MAP PE enable higher with cam? stock setting is 15 kpa, everyone says to put it to 70-75 with a bigger cam. why?
stock, pe will enable at the % throttle, you will never run under 15 kpa to disable it. so why would you want it any different with a bigger cam? or is it just somethng that would be even better with the stock cam to raise it, save gas?
i dont know but someone explain please
and what are those other settinsg on there for under map enable, in hp tuners
stock, pe will enable at the % throttle, you will never run under 15 kpa to disable it. so why would you want it any different with a bigger cam? or is it just somethng that would be even better with the stock cam to raise it, save gas?
i dont know but someone explain please
and what are those other settinsg on there for under map enable, in hp tuners
07-31-2005, 10:22 AM
#5
also everyone tunes the car in open loop with the olfa table, why not put pe enable settings all to 0 and do it from there?
i still dont understand raising pe enable map, unless its to hit more closed loop cells when tuning and then you set it back to stock.
i still dont understand raising pe enable map, unless its to hit more closed loop cells when tuning and then you set it back to stock.
07-31-2005, 12:21 PM
#6
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If your talking about the P0121 Parameters (min/max MAP)
Its becasue in the automatics, when you go WOT from a stop it will shift into 2nd gear right away, so i moved mine to 75/85
Its becasue in the automatics, when you go WOT from a stop it will shift into 2nd gear right away, so i moved mine to 75/85
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08-01-2005, 12:50 PM
#16
Well, PE should be disabled when you are tuning in Open Loop SD (which you should do for VE tuning, provided you have a wideband). I've been messing with my PE (on a stock cam), and I have it set so that it is WAY more responsive now. Granted, I'm running a closed loop SD tune full time, but I'll probably be posting my findings soon when I can get some more verification that what I did actually worked the way I wanted it to.
08-01-2005, 01:12 PM
#18
I'm only running a TR224 cam, and the data I collected showed no need to raise the MAP threshold for PE.
However, with bigger cams that make less vacuum (higher MAP reading) it's generally necessary to increase the MAP threshold value to keep PE from kicking in prematurely.
However, with bigger cams that make less vacuum (higher MAP reading) it's generally necessary to increase the MAP threshold value to keep PE from kicking in prematurely.
08-01-2005, 01:20 PM
#19
kicking in prematurely? this is what i posted for people say this but the stock setting is 15 kpa, the stock cam idles at 30 kpa, most of the cells i see when cruising are 20's so stock cam or big cam pe will enable the same if its set at 15 kpa.
what is your reason for it "kicking in prematurely" because i disagree with this and this is what everyone says. stock cam and my f13 both see above 15 kpa cruising, so the only setting turning on pe is throttle %, not the pe, since its always over that except on decel. raise the limit and get better fuel economy. lower it and get some more power on part throttle accel. put it up to tune ve easier. those are the 3 things i see with changing it, and thats it
what is your reason for it "kicking in prematurely" because i disagree with this and this is what everyone says. stock cam and my f13 both see above 15 kpa cruising, so the only setting turning on pe is throttle %, not the pe, since its always over that except on decel. raise the limit and get better fuel economy. lower it and get some more power on part throttle accel. put it up to tune ve easier. those are the 3 things i see with changing it, and thats it
08-01-2005, 01:32 PM
#20
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15 kpa means it can be activated pretty much at anytime, setting it to 80 kpa guarantees it comes on when close to or at WOT.
Kicking it in prematurely will supress any knock that may arise from moderate to aggresive aceleration or loads on teh engine. I havent changed mine because i would like for it to come on as needed and if need be before 80kpa. I think people started doing this to kinda turn pe off for SD tuning. 80 kinda turn it off and would need a large throttle movement to hit this map value. When SD we arent trying to move the pedal that much so to speak. 80 still allowed the car to go into PE mode if you local mustang rolled up on you while tuning. This method to me is kinda redundant because we set this to 80 set the olfa table to 1.13 and turned off the pe table (which really isnt turning it off but anyways) and forced the PCM to use the OLFA table for ALL its fueling (PCM selects the richer of the two table values and that is why we set pe vs rpm to 1.0). with all that said I left mine stock (15 kpa) and my OLFA table and PE table both set to 1.13
Here is a description from the EFILive help notes
Kicking it in prematurely will supress any knock that may arise from moderate to aggresive aceleration or loads on teh engine. I havent changed mine because i would like for it to come on as needed and if need be before 80kpa. I think people started doing this to kinda turn pe off for SD tuning. 80 kinda turn it off and would need a large throttle movement to hit this map value. When SD we arent trying to move the pedal that much so to speak. 80 still allowed the car to go into PE mode if you local mustang rolled up on you while tuning. This method to me is kinda redundant because we set this to 80 set the olfa table to 1.13 and turned off the pe table (which really isnt turning it off but anyways) and forced the PCM to use the OLFA table for ALL its fueling (PCM selects the richer of the two table values and that is why we set pe vs rpm to 1.0). with all that said I left mine stock (15 kpa) and my OLFA table and PE table both set to 1.13
Here is a description from the EFILive help notes
When the manifold absolute pressure (MAP) is above this value power enrichment mode can be enabled.
