I have been confused as to what my fic 1000s deadtime is with a stock 2000 miata fuel system. In megasquirt it has a setting to put in required fuel by putting your size of injectors but someone told me the nb miata flows at a higher pressure so what would my injectors flow at? I really don't know where to begin but I did get help from someone at FIC and would like to ask you all if this sounds right

"Okay I understand, you’re working with MS2 and that is a little bit more simplified.For flow rate at 58 psi, you’ll enter 1190 cc/min.Deadtime at 13.2 Volts and 58 psi is 1.178 ms , and for the average ms/V, you’ll enter 0.180."

I thought the nb pressure was 60psi at idle

Here is some data for reference. If someone can confirm if what i was told to put in to be correct i would appreciate very much.

 

It’s actually 4 bar, or 58.01XXX…, most people round up to 60psi

 

Yes from what I read in various threads the nb is somewhere in the 60psi under perfect conditions. Now if I can just find what data to input for my mspnp2. I'll admit I do not know how to do the math to figure this out. I had the guy at fic tell me the info at 4 bar 58psi but when I start the car its extremely lean. I will have to investigate in the morning and maybe upload a log here.

 

Enter the injector size as 1190, dead time of 1.178, and ms/V of .180. Those numbers are all in the ball park. Tune the rest.

 

Curly thanks man. Hey if you see this in time I did get the numbers adjusted for idle at 60psi. It increased required fuel and deadtime a little but the voltage correction stayed the same. Only thing is I think I should get a gauge to figure out what exactly my idle pressure is. It should be 60 or whatever is normal since it's a new pump. I think I'll change my filter just so I know it was all done by me. Thank you for the help 🙏

 

What VE are you idling at when total correction is around 100%? If it's 30-50 when idling at 14.7, you're in the ball park for fuel pressures and you should just tune the car. I've only ever seen fuel pressure issues at idle causing a no-start condition. Failing fuel pumps are generally seen with increasing VE numbers at high RPM/boost, verified with a pressure gauge.

 

Curly I'll have to get back to you on that Because I have not been able to mess with it since Sunday. I took a small log when it was idling really lean just after the first startup with new injectors. I could not get it to idle anywhere near 14.7 and as it got warmer it eventually stalled on me. I think my ve needs to be brought up but I'm only guessing from what I read and what others have said. If I get a chance tonight I'll post that little log of when I was lean.

Ps. I'm still learning tuning but I do remember in the log when watching the afr table it was hovering at stoich but the actual gauge in my car read differently. I'm not sure if this is an issue with the communication or if the graph was showing that it was attempting to get to stoich. I'm away from my computer but will update this thread by tomorrow morning the latest.

 

Another thing I will add is that I'm pretty positive that my afr gauge and tunerstudio gauge is close to accurate maybe a .1 off. I ended up having to use the linear wideband settings and finding the correct voltage settings. When I used the saved presets on tunerstudio then the wideband would be at least 1 whole point off more like 1.1 off.

 

i am new to sharing i think this is how?

 

or this?

 

i apologize i need to learn how to share logs. it is late and i am tired. will report tomorrow

 

Ok so curly I was able to bring the afr down to about 15 and thr idle is a lot more consistent by me adding to the ve table. All I did was bring up the idle cells about double from what they were. I'm at work but iirc they used to be at around 35 and I just highlighted them and brought them up to about 70-75.