Why does 1st gear slam into 2nd? 4L80E translplant

[1SlowHoe]

So, do you have a blower on this? Your log shows a MAP value of 104 at part throttle....

Lee

Yep, magnacharger m112. Makes about 9psi, cam, 4.10 gears, 6.0L swap and a 4L80E. Makes about 500 to the wheels

[LS1_Dragster]

What computer do you have? I don't know a lot about all that's out there but I do know that when I replaced the computer in my 3 vehicles to the 0411 computer with custom OS it was a dream come true. If you did you could use a 2 bar MAP sensor and control fuel and timing under boost.

How does it add extra fuel? On my Yukon I had to add a separate fuel management system to deliver the extra fuel but now the computer does it all.

Lee

[1SlowHoe]

What computer do you have? I don't know a lot about all that's out there but I do know that when I replaced the computer in my 3 vehicles to the 0411 computer with custom OS it was a dream come true. If you did you could use a 2 bar MAP sensor and control fuel and timing under boost.

How does it add extra fuel? On my Yukon I had to add a separate fuel management system to deliver the extra fuel but now the computer does it all.

Lee

Im still using the stock computer. The fueling is still controlled through the PCM. I added 42# Ford SVO injectors, an inline walboro 255lph external fuel pump, and a Kenne Bell boost-a-pump on a 2psi hobbs switch then the tuner did his thing. Not sure how it all works but on a loaded dyno he spun it up and added fuel based on the AFR reading from my WB O2 sensor. I only run about 17-19* of timing at WOT.

I only see KR from time to time when I lean into the throttle while in 4th and converter locked but not hard enough to command a down shift. Then I get 70-8* of KR instantly and I either down shift manually or get out of it.
I don’t think you have to go to a custom OS to use a 2 or 3 bar map. I thought the stock PCM could handle that you just had to adjust something on the tables. I've never looked that deep into it.