C6 Ls3 Vortec 6psi 2.5 Bar Map Os Short Terms -15% For 5 Mins, 0 After 5 Mins

[mrcdyno]

Hi guys and gals,

I have an '08 C6 Vette A6.

Fitted with a Vortech intercooled 6psi kit.

Fitted with 750cc Xspurt injectors.

Fitted with a 2.5 bar map sensor, applied the 2 bar OS.

Conditions:- normal operating temp 205, start vehicle, run on dyno, in closed loop, short term trims are approx -15% in all cells.

After 5-10 mins. Short terms go back down to -2 to 0 everwhere.

I can't find any values that may change over this time period.

Every start this happens.

Any one experienced this before.

I originally tuned the VE map so it had -2 to 0 trims. then after 5 mins it trimmed in +15%.

Making 536 rwhp on a dyno dynamics dyno.

Thanks

[carlrx7]

monitor your FTC (fuel trim cell) my trim go fat when evap kicks in

[DSteck]

Xspurt. Lol.



I see this happen a lot. I wouldn't worry about it. It's possible EVAP is purging at first.