Maxing out PE table
11-13-2006 | 12:09 AM
#31
Registered User
Joined: Sep 1999
Posts: 393
From: NASHVILLE, TN
I don't think larger injectors are going to help since you are only 75% duty cycle. Try playing around with the coolant/PE table some more. It gets frustrating but, once the MAF maxes out we are just trying to trick the computer into giving more fuel than what the computer and MAF thinks it needs.
11-13-2006 | 05:30 PM
#34
Registered User
Joined: Jan 2003
Posts: 799
From: Breese, IL
with the right pump setup, enough for 750rwhp or better... it's not the lines or the injectors if the duty cycle is at 75%.
xxsaint69x: you'll still run into the same odd limitation if you turn up the boost and want to get more out of the 95lb'ers... If that limit is somehow a factor of injector size and duty cycle, you still might experience it by setting the injector size to 95 and hitting some odd duty cycle limitation near 60% (assuming it's like a 16 bit numeric calculation limit or something similar). Your fix may not clear up the limitation at all...
You really didn't need bigger injectors. The cheap solution would have been to shrink the injector size and pull fuel out down low. You would have essentially tricked the computer into flowing more by thinking it was flowing less... MAF tables are easy to tune and you'll have to re-do it for the bigger injectors anyway.
xxsaint69x: you'll still run into the same odd limitation if you turn up the boost and want to get more out of the 95lb'ers... If that limit is somehow a factor of injector size and duty cycle, you still might experience it by setting the injector size to 95 and hitting some odd duty cycle limitation near 60% (assuming it's like a 16 bit numeric calculation limit or something similar). Your fix may not clear up the limitation at all...
You really didn't need bigger injectors. The cheap solution would have been to shrink the injector size and pull fuel out down low. You would have essentially tricked the computer into flowing more by thinking it was flowing less... MAF tables are easy to tune and you'll have to re-do it for the bigger injectors anyway.
11-13-2006 | 08:07 PM
#35
Thread Starter
Registered User
Joined: May 2000
Posts: 2,889
From: Peachtree City, GA
with the right pump setup, enough for 750rwhp or better... it's not the lines or the injectors if the duty cycle is at 75%.
xxsaint69x: you'll still run into the same odd limitation if you turn up the boost and want to get more out of the 95lb'ers... If that limit is somehow a factor of injector size and duty cycle, you still might experience it by setting the injector size to 95 and hitting some odd duty cycle limitation near 60% (assuming it's like a 16 bit numeric calculation limit or something similar). Your fix may not clear up the limitation at all...
You really didn't need bigger injectors. The cheap solution would have been to shrink the injector size and pull fuel out down low. You would have essentially tricked the computer into flowing more by thinking it was flowing less... MAF tables are easy to tune and you'll have to re-do it for the bigger injectors anyway.
xxsaint69x: you'll still run into the same odd limitation if you turn up the boost and want to get more out of the 95lb'ers... If that limit is somehow a factor of injector size and duty cycle, you still might experience it by setting the injector size to 95 and hitting some odd duty cycle limitation near 60% (assuming it's like a 16 bit numeric calculation limit or something similar). Your fix may not clear up the limitation at all...
You really didn't need bigger injectors. The cheap solution would have been to shrink the injector size and pull fuel out down low. You would have essentially tricked the computer into flowing more by thinking it was flowing less... MAF tables are easy to tune and you'll have to re-do it for the bigger injectors anyway.
Ill post updates once they get here 
11-14-2006 | 11:41 AM
#36
Registered User
Joined: Nov 1999
Posts: 310
From: frederick MD.
I was seeing duty cycles around 125% with my 75# injectors now with my
95s I see around 80%. There are a bunch of tables to tweak to get the big injectors to work with the stock computer. Don't ask me what they are CAM tunes my car. I have taken it way beyond my ability to tune it myself.
95s I see around 80%. There are a bunch of tables to tweak to get the big injectors to work with the stock computer. Don't ask me what they are CAM tunes my car. I have taken it way beyond my ability to tune it myself.
11-18-2006 | 10:31 PM
#37
Thread Starter
Registered User
Joined: May 2000
Posts: 2,889
From: Peachtree City, GA
with the right pump setup, enough for 750rwhp or better... it's not the lines or the injectors if the duty cycle is at 75%.
xxsaint69x: you'll still run into the same odd limitation if you turn up the boost and want to get more out of the 95lb'ers... If that limit is somehow a factor of injector size and duty cycle, you still might experience it by setting the injector size to 95 and hitting some odd duty cycle limitation near 60% (assuming it's like a 16 bit numeric calculation limit or something similar). Your fix may not clear up the limitation at all...
You really didn't need bigger injectors. The cheap solution would have been to shrink the injector size and pull fuel out down low. You would have essentially tricked the computer into flowing more by thinking it was flowing less... MAF tables are easy to tune and you'll have to re-do it for the bigger injectors anyway.
xxsaint69x: you'll still run into the same odd limitation if you turn up the boost and want to get more out of the 95lb'ers... If that limit is somehow a factor of injector size and duty cycle, you still might experience it by setting the injector size to 95 and hitting some odd duty cycle limitation near 60% (assuming it's like a 16 bit numeric calculation limit or something similar). Your fix may not clear up the limitation at all...
You really didn't need bigger injectors. The cheap solution would have been to shrink the injector size and pull fuel out down low. You would have essentially tricked the computer into flowing more by thinking it was flowing less... MAF tables are easy to tune and you'll have to re-do it for the bigger injectors anyway.
YOU WERE RIGHT...now i am gettin around 60% Duty cycle !!! ITS WORSE...Someone please tell me waht i need to edit in the PCM to fix this problem...obviously there is somethign that needs to be changed as Jeff is runing a stock PCM with no problems
11-19-2006 | 09:43 AM
#39
Thread Starter
Registered User
Joined: May 2000
Posts: 2,889
From: Peachtree City, GA
why would i tune my idle and start all over if i cant figure out how to add the fuel in the upper RPMs???
i dont want to trick the pcm into thinkin it has 60lb injctors.....Jeff, or Rich didnt have to do it, and i am sure there a plenty of others that put the right constant in the PCM
11-19-2006 | 11:00 AM
#40
Registered User
Joined: Sep 2002
Posts: 1,942
From: kitchener/Ontario
why would i tune my idle and start all over if i cant figure out how to add the fuel in the upper RPMs???
i dont want to trick the pcm into thinkin it has 60lb injctors.....Jeff, or Rich didnt have to do it, and i am sure there a plenty of others that put the right constant in the PCM
i dont want to trick the pcm into thinkin it has 60lb injctors.....Jeff, or Rich didnt have to do it, and i am sure there a plenty of others that put the right constant in the PCM
You went from 75lbs to 96lbs that is adding 20% of fuel....but your tune is so out of wack......you are not seeing what you want....
START!!!!!! from step 1.......
11-19-2006 | 11:06 AM
#41
Thread Starter
Registered User
Joined: May 2000
Posts: 2,889
From: Peachtree City, GA
figured it out...increased the PE vs Coolant Temp in the cells from 56C-92C, to 75% change and now i am gettin the damn fuel finally...now i can adjust the PE vs RPM table to get everything nice and smooth 
11-19-2006 | 05:40 PM
#42
Thread Starter
Registered User
Joined: May 2000
Posts: 2,889
From: Peachtree City, GA
and now it runs so damn rich i cant clean up the lower rpms....i have -50 and i am still at 10.5
11-20-2006 | 10:32 AM
#43
Registered User
Joined: Mar 2000
Posts: 186
Curious, is your FPR boost sensitive? If it is not, you are actually dropping fuel pressure (equivalent to boost) as the RPMs increase.
As for you being rich at lower RPMs with the 85% setting, maybe you have to strike a balance with your PE vs coolant table and your PE WOT table.
-Alex
As for you being rich at lower RPMs with the 85% setting, maybe you have to strike a balance with your PE vs coolant table and your PE WOT table.
-Alex
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