FJO mini controller with a wet kit on an LS-2. While the kit is pulsing (3200 to 4500) the a/f is between 13 and 16, after the pulsing stops the a/f is 12.5. Any ideas? TODD

 

umm... what is your fuel pressure?

 

You are probably seeing a lean spike ( that all these cars have sort of) but that does seem long on rpm (how much time is that). What is the ramp time you are using. Fianl a/f seems a little lean also. I like a bit lower not much just a bit.
Ricky

 

Ricky, I have it set to RPM mode and 3200rpm on at 0% 4500rpm 100%. as soon as the spray is activated it pops a bit like its lean for a split second. On the motor the a/f is 12.86 and at 4500 rpm (after pulsing) the a/f goes ok again (12.5)

 

Just for referance.. how big of a shot?

 

130rwhp

 

How is it wired up, is there a fpss in the system, the whole pop thing has me wondering a lot.
what the freq. set at.?
pop in the intake or exhaust.?
send me your set up file, would like to take look at how its programed and if there is something I can see right off.
Ricky

 

You have both noids going to the same color wire?

 

Ricky, yes fpss in the fuel rail which I could bypass to see if the initial pressure drop is causing the "poping". Its almost like a mis for a split second. Both solenoids to the blue stage 1 wire and 15hz for lighning sol.

 

you've got lightning noids.? were did you connect that fpss in the wiring.?
Ricky

 

Yes Lightning and the FPSS is in the ground wire at the relay

 

hmmm, for testing only either lower the set point or bypass it.
and how did you come across those, if you do not mind me asking.?
Ricky

 

I will bypass and try it. Oh well lets just say I was at the right place at the right time and between Nitro Dave and yourself I got a set. Thanks a bunch. TODD.

 

hmmmm, hope they are not BLACK.
Ricky

 

How do you have your fuel system? Is the fuel for the wet kit coming off the fuel rail? If so whats the TOTAL HP your are trying to get from the fuel system? Whats the car make NA? What fuel pump?

Definaltey bypass the fpss first and let us know what you get.

 

I'm not saying this is the problem, but I have always wondered this about progressive controllers. If you pulse both a nitrous solenoid (1000psi) and a fuel solenoid (60psi), simple thinking would tell you more nitrous will get by the solenoid every time equaling lean. Just like the small lean spikes seen on initial hits w/ out progression. This small lean spike would just be prolonged because of the on/off/on/off of the progression. Please correct me if i'm wrong. I hope i'm wrong too.

 

What type of system are you using... wet single fogger? Direct Port? MAF?

 

Nitro Dave wet plate with NX solenoids. When I get time today I will do the bypass.

 

Im not sure why the airfuel is leaner on the controller. But I am interested. However as a base line airfuel we need to get that at 11.8
Dave

 

I have seen the with any progressive system......that is you have a sharp lean spike with a normal on/off type system....the lean area will be drawn out over more RPM...but its usually not as sharp.

I would set your ramp time to go from 3200-6200 and 0%-100% at those rpm. If the fuel system is have issues keeping up it always seems to me to take about 1500 rpm which would be a coincidence with your ramp rpm you had set. So if you set it to ramp from 3200-6200 and you then have a lean area from 3200~4700 but then the fuel comes back in like normal from 3700-6200 then its a fuel delivery issue and has nothing to do with noid pulsing. If after you change it to 3200-6200 and it goes lean the entire time then its likely an issue with the setup of the controller.

Also to back this up when testing...try the system in the on/off mode (not ramped) at say...3500 and see what kind of lean spike you have and note the AF. Actually...you should do this test first to see the baseline AF on the kit/jetting. Preferably with a GOOD wideband and not a dynojet wideband. The dynojet seems to smooth the AF line too much and doesnt show sharp spikes and response time is slow.

I used my FJO wideband simultaneously with the dynojet and my FJO would show much greater activity and response time. A lean spike on the fjo would peak out at say 17 to 1 for less than 100 rpm...and it would barely register on the dynojet wideband as say 14 to 1. A very bad lean spike in on/off mode will usually be drawn out a lil with a progressive...but not be as peaky.

Anyways...I would start with bypassing the FPPS...and then do those tests.