Thread: K Value (Calculation)

How to calculate the K value for different setups? I have problem with 259cc's @ 3 bar and N60 maf on a B13.

Thanks!

Search buddy, actually you don't even have to do that, just look at one of the stickies...

http://www.sr20-forum.com/tuning/15775-noob-tuning-his-own-car-calum-rt.html#post206603

If only it was that easy.

N60 maf de everything else - SR20 Forum

can someone please post up the k value correction though.

like how your supposed to multiply the k value when intalling a larger inj.

im running the ve base map, tuned. and i want to run the 333inj @ 4bar.

yep! a little hot to...

This calculation is based on a simple ratio of old vs new for both injectors and airflow meter. For example if the stock K value is 34,275 and injector size was changed from 370cc to 550cc then the new value will be 21,475 x (370/550) = 14,447. Obviously if we have bigger injectors then we need a smaller K value.
Same deal with airflow meters except we use maximum horsepower figures to do the calculation. For example it is taken that a standard SR20 airflow meter gives its maximum reading at around 290hp. If we fit a Z32 airflow meter, which has a max HP rating of 550hp then the calculation is 21,475 (standard K value) x (550/290) = 40,728.
If you change both injectors AND airflow meter you need to do both of the above calculations: 21,475 x (370/550) x (550/290) = 27,400.
This is only a rough calculation to get things “in the ball park”.

That's just a copy and paste from this.

http://www.plmsdevelopments.com/files/nissan_ecu_tuning_basics.pdf