Hello,
I am about to change injectors. Currently have 460cc injectors and am changing to 550cc purple tops (although look more like red).
My current required fuel setting is6.2 and 6.2 ms. I know I need to change them by the percentage of injector change.
17% i believe. So do I add 6.2 x .17 = 1.054
So do I add or remove 1.054.

What about ms do I change that.
I have the ms2 diypnp.

Also in looking at my ve table at the top in boost I am in the 120-129 range is that ok.

Idle is at 32 ve.

Thanks in advance I tried to figure it out by searching.

 

remove, also I bet your dead time is what 1.2?

 

so 5.2 req fuel do I change the 6.2 ms to 5.2 too.
What is dead time and should I change it.
You are right it is currently at 1.2. Should I change it.

 

In my searches it showed the 550 needed a 7.0 to 7.6 req fule why is mine so low?

Also most ve table I see dont have any # over a hundred but mine does. Can some one please explain.

Also what is dead time?

 

new req_feul should be 5.2. thats all you should change.


/thread.


math, since you messed it up: 460/550 = .84 x 6.2 = 5.2

 

to add to brain's "/thread" comment... here is why:

your engine's VE is not changing. therefore the VE table shouldn't need to change. just the scaling of the fuel and req_fuel addresses that.

 

Ok. I get that I guess my question is what are the acceptable limits/range of ve cells. I see most people dont have anything over 100 in htere map. Mine goes to 129 in boost at high rpm.
Is that anything to be concerned about.

 

nope. you could techincally leave the req_fuel value the same and rescale the entire ve table by 117%


then youd be well above 129%VE

 

VE Table can go 0-255 I believe.

the more you use, the better your fuel resolution. Just dont run out!

VE can be above 100% with boost since you're pushing more air into the cylinder than it can suck in by itself via vacuum.