Running rich off of idle
Hell Yeah....
I like that trophy. Glad things are working out. You will be a master technician soon. Taking applications to replace me. Doesn't pay much, but guaranteed to keep you busy.😅😅😅😅
Nice, I'd rather have a flask too.
On the lean issue, what is your fuel pump? Are you using the command center?
Quote from Austin DeHaas on June 28, 2019, 1:22 amYour data is still all over the board. I can't tell what your idle is set at. I can't tell what your IAC steps are set at. I can't help until idle is correct......
Ok....I got IAC step at 20.....cam is big.
All good. Now I need to solve the hyper rich at idle problem. I will take another run log tomorrow and post
Quote from 66GTAconv on October 20, 2019, 1:13 amQuote from Austin DeHaas on June 28, 2019, 1:22 amYour data is still all over the board. I can't tell what your idle is set at. I can't tell what your IAC steps are set at. I can't help until idle is correct......
Ok....I got IAC step at 20.....cam is big.
All good. Now I need to solve the hyper rich at idle problem. I will take another run log tomorrow and post
Really need to lean out idle on a big cam.
OK.....got IAC to 20 and here are three logs Basic/Fuel Calc/Idle control
Ran MUCH MUCH better. IAC was at about 15 or so at idle after driving around. Im not sure the passenger side idle screw is set right and could use help on AFR
https://www.dropbox.com/s/1argtcmmjgw1wp3/Basic%20running.csv?dl=0
https://www.dropbox.com/s/i1eoku5lm76cvbh/Fuel%20Calculation1.csv?dl=0
https://www.dropbox.com/s/tckphys2bcv3jut/Idle%20Control4.csv?dl=0
Under Load 1500-4400 RPM Basic readings:
https://www.dropbox.com/s/weurcv3pnldy7ya/UnderLoad%20Basic%20Reading%201500-4400%20rpm.xlsx?dl=0
What cam setting? Adding a bunch of fuel, but it shows rich and never reaches your target. Something not right. This is what I saw from the first log.
Quote from Crankyolman on July 1, 2019, 7:39 pmNice, I'd rather have a flask too.
On the lean issue, what is your fuel pump? Are you using the command center?
I have the standard inline pump. It seems to starve out the unit for fuel. If I cycle the key a couple times I can actually hear the system charge up again. Then I can drive a short distance until in starves out again.
Is there a known issue with the inline pumps? Should I look at other units? I have checked my supply lines and they are good.
Quote from pjnagel on October 22, 2019, 2:11 pmQuote from Crankyolman on July 1, 2019, 7:39 pmNice, I'd rather have a flask too.
On the lean issue, what is your fuel pump? Are you using the command center?
I have the standard inline pump. It seems to starve out the unit for fuel. If I cycle the key a couple times I can actually hear the system charge up again. Then I can drive a short distance until in starves out again.
Is there a known issue with the inline pumps? Should I look at other units? I have checked my supply lines and they are good.
Which pump do you have? How is your fuel system setup?
Inline pumps are the last resort for EFI. Especially when on street cars. They are not as reliable as intank or the now available Force Fuel from Fitech.
While reading messages on a Chevelle forum I came across a link to the Edelbrock EFI system. Despite the fact that it is a completely different system, the tuning principles are the same and the detail to which they go is much greater than anything I have seen from FiTech, ie. "We are not a tuning school." With respect to idle quality with high overlap cam, Edelbrock goes into great detail as to why idle is unstable. They suggest disabling closed loop operation at idle to avoid the excessive rich lean variation and compensation. In looking through the FiTech options it seems that Fuel Trim RPM Min is where one could address this. Default appears to be 500 rpm. My idle is 830 so I set mine to 1000 RPM. My idle is indeed more consistent.