Thread: K Const for nistune

I was wondering if anyone has any info on the K const/inj multiplier for some 60lb mototrons. When I used the conversion feature on nistune, from stock 259cc to 630cc, im getting a value of 218. Which is causing the car to run way too rich. Based on bins I have found here a 72lb msd injector has a value of around 212, 525cc around 350? Right now I am using a value between 400 and 500 to allow it to idle. What in the world is going on? These values are higher than stock 259cc values.

Your gonna have to adjust latency also and tp max and tp min which is injector cranking or something.

Set the latency too. This step will help with setting up the new injectors. Set the flagged part of the 02 sensor feed back all the way to 0. Then open up the injector multiplier screen and check the auto button. Start the car and start sliding the bar back and watch your A/F ratio. When it hit's 14.7 save the Knumber and then turn put the numbers back up to normal in the flagged area. Don't forget to knock copy before and after.

The injector adjuster does the tp max and min but not latency. The Kvalue it gives is just a close enough to get it running number.

sounds good man, ill give it a try thanks

The MAF your running has something to do with th K constant also
making u have to add so much to ur K value to get it to idle.