Need help with Air/Fuel Ratio

[NCRmtrsprts510]

i think i got the hang of it, i just need to fix the fucking crack on the cheap ass manifold and then tune it with the safc and keep doing pulls and i should be good..cause i just need to find out what correction is the best AFR for what rpms im good, and i know im not maxing the injectors or maf cause it pulls with no hesitation all the way to redline with it being a little on the rich side all the way, so i just need to lower the correction i think

[NCRmtrsprts510]

some more AFR graphs... let me know what you guys think??

 

 

Highlighted part is the pull, 1st run with SAFC mostly at +6% taking off an on ramp 4th gear 1500-7000rpm (or 8k, cause it just completely shut off the injectors when i was WOT, OR it could of been the limiter cause i was doing well over 100mph)

 

cruising around the streets

 

2nd run after correcting SAFC to 0%-2% across, about 1500-6000rpms 4th gear highway speeds WOT.

[Icehouse]

Doesn't the xd-16 have inputs so you can monitor RPMs as well as throttle position?

[Skib]

stoichiometric AFR = 14.7

[ktm]

Seriously, those plots are absolutely worthless without RPM and manifold pressure plotted. For normally aspirated engines, RPM and AFR are all that are needed. However, for forced induction engines it is important to know RPM, MAP and AFR.

 

Now here is how you use Logworks:

 

[NCRmtrsprts510]

I know haha I have the LC-1 which only has AFR, i need to get the SSI-4 interface between the LC-1 and laptop so i can see the RPM, Injector Pulse Width, Throttle Position, Driveshaft/Wheel Speed, or Boost/Vacuum, but only 4 at one time, they have the kit with both LC-1 and SSI-4 but i got the LC-1 pretty cheap. So now i just need to get the SSI-4 so i can see everything on one graph. because it is pretty hard trying to tune by just the AFR.

SSI-4 : http://www.innovatem...42&cat=0&page=1

 

LC-1+SSI-4 : http://www.innovatem...39&cat=0&page=1

[ktm]

I am using an LC-1 and LMA-3 Auxbox. The auxbox has RPM, MAP, EGT (input), accelerometers, and 2 or 3 (can't remember) inputs. The inputs would override the accelerometer channel.

 

That is my log file. I am logging methanol pressure (and at one time I was logging intake air temperature) in addition to MAP, RPM, AFR and accelerometers.

 

Tuning without MAP on a turbo'd car is like having sex without a condom. It only takes 1 time to royally fuck things up. :)

[NCRmtrsprts510]

isnt the SSI-1 the same as the LMA-3 but simplified? and without the accelometers?

[ktm]

Yes. It is a generic LMA-3 without the internal MAP sensor, EGT input, and accelerometers. Between the two, however, I would go with the LMA-3.

[NCRmtrsprts510]

oh so with the LMA-3 has an internal MAP sensor? so u can hook up a vac line to the interface? as to the SSI-4 you would have to hook the signal wire from the motor?

 

what are the accelerometers used for?

 

 

but there is a big difference in price.. SSI-4 $130 -- LMA-3 $250.. haha

[ktm]

Yep, you simply hook up a vacuum line from your manifold to the LMA-3. The accelerometers are basically built-in G-tech's. :)