1-2 Gear Shift Timing pull - JB4tech.com

Motown65 · **1-2 Gear Shift Timing pull -** 10-06-2021, 01:10 AM

Hey guys my 1-2 gear shift is awfully laggy and rough. The rest are crisp. It looks like ign timing falls on its face and boost target drops down.

My car is a 2018 M4C DCT with pi, ps2+, xHP, jb4 w/ mhd bef, bms pi controller and exhaust. Also have plus at .02.

Steve @ BMS/Fuel-It! · 10-06-2021, 10:47 AM

I don't really see an issue with the log. 1st and second gear are typically just a spin fest so that's pretty typical. I'd do a boost reduction for 1st, 2nd, and probably 3rd.

Motown65 · 10-06-2021, 05:23 PM

Quote:

Originally Posted by Steve @ BMS/Fuel-It!

I don't really see an issue with the log. 1st and second gear are typically just a spin fest so that's pretty typical. I'd do a boost reduction for 1st, 2nd, and probably 3rd.

Car actually seems to keep traction even on unprepared asphalt in 1st. This morning I got another log in. I changed my torque reduction in xHP to drop 150nm less and it’s holding calc torque higher on the 1-2 shift. It didn’t seem to loose traction till the top of 2nd at like 56mph. I forgot to mention I have 18in 305 MT ET SS. Is dme bt supposed to drop like that on the 1-2 shift? Also is timing supposed to hit 0 in 2nd?

Steve @ BMS/Fuel-It! · 10-07-2021, 10:01 AM

Is traction control completely off?

Motown65 · 10-07-2021, 05:28 PM

this is all launch control testing

Steve @ BMS/Fuel-It! · 10-11-2021, 10:40 AM

That's going to lead to a lot of intervention from the DME...not really something we have any control over.