Om606 4l80 105

[garbo]

G'day

My first post in a long time. I have installed an om606 with a manualized 4l80 into my 105. The 606 has dpuk elements and a holset he221 turbo. When taking off in first gear it is extremely doughy. Especially uphill or on grass. Once boost kicks in it hammers. Today I double checked timing and it seemed correct. Any ideas where I should look next? Possible issue with torq converter?

Cheers

 

[suppjoe]

I would bet incorrect stall speed torque converter. Seems like you would want something with a little higher stall speed for a 300-ish hp om606. I think stock 4L80 stall speed is lower than 2000. Really interesting sounding project!