rsmatti

I purchased a used Ems with a tune similar to mine already on it. I would like to drive the car to my tune and feel this tune on the computer is safer then a base map.

The only difference is the tune is set up for dual walbros and ID 1000CC injectors.
My setup has ID 725cc injectors and one walbro.
any ems gurus out there that can insight me on how to adjust this setting so I can start the car safely, and drive it to the tuner.

D1sclaimer

I would save the tune to your laptop that is on it now just in case.

You will need to correct the battery offset table table and scale your fuel map. That is assuming you are also running the same fuel pressure as the guy who ran that EMS before you.

To correct the battery offset table go here.

Fuel -> Advanced Fuel -> Fuel Trims -> Battery Offset Primary Table -> Graph

Use this table and the fuel pressure that you are using to fill in that graph. If you are using a stock fuel pressure regulator, use 43.5psi on the chart. Smooth the graph out on the parts where it doesn't give you values.



To correct the fuel, you are switching the EMS from 1015cc injectors to 715cc injectors. Thats right about a 30% difference. Go to your fuel table, highlight all of the values, right click on the fuel table and click on "percent change." Type in 130 and hit okay.

Try starting her up and see how it runs. It will need to be fine tuned more, but that should get it started.

Dan1987

Surely he'll need to INCREASE the fuel table by 30% if he's changing the map from 1000cc to 715cc..the 715's flow less fuel so will need a 30% longer pulse width.

Dan.

D1sclaimer

F me, you're right. I wonder what kinda drugs I was on this morning.

rsmatti

Alright will do to sart her up