WHO CARES ABOUT HORSE NUMBERS?!

torque is the only thing anyone tuning an engine should be concerned about when it comes to output.

right now you're just running an engine with off timing and a rich mixture. and how about you check your gas bill before saying you're getting better mileage because the only way power would have jumped is if he was tricking the ECU into dumping more gas into the engine.

I'm seriously sick of these tech forums

 

If your sick of the forums, then dont visit them. Theres no reason to be an asshole to people just because your "seriously sick of tech forums", cause its not my fault.

my timings off? Please explain to me how adjusting fuel to air ratio has anything to do with timing. The VAFC tells you everything its doing when its doing it, what its adjusting etc...and its REDUCING the amount of fuel, it never increases it. Last but not least, I have a dyno to prove the smoother, more powerful powerband.

 

a vafc only controls the fuel mixture, it can't compensate anyway else, i was in a horrible mood earlier and it's why i was being such a jerk... but anyway...

air/fuel mixtures of the same concentration burn at the same rate no matter engine speed.

where one cycle may take X seconds at 2000rpm, it's taking one half that time at 4000 rpm... if the A/F mixture at those times were the same then the mixture would take just as long to burn at 4000rpm as at 2000rpm, get me?

so while the VAFC can control the a/f mixture, it cannot adjust the timing to best fit whats going on. adjusting the A/F means you're messing with the timing, thats outright.

now look, i'm not saying you can't tune with it or it's not going to work out ok, but the whole system, and how it works, are far too simple for the job that needs to be done.

and are you telling me that you only leaned out the mixture? i find that hard to believe....

 

when you lean out the engine using a piggy back the byproduct is you also advance the timing. you cant adjust each independantly.

 

Sherwood
I guess I'll take that as a half assed appology. Ok, help me understand one more thing, and thank you for helping instead of just being an asshole, appreciated, why is my car faster, and the dyno curve smoother and more powerful? The mixture is leaned out. Unless the tuner reprogramed the VAFC, and now it says - when its + and + when its -. I guess I dont understand how I could gain anything, you would think if I fucked up the timeing, I would lose power.

Snoopy, does that happen even with a very small amount of fuel trimming, or is it more of a factor when boosting and you adjust your fuel trim A LOT?

 

read the link i posted earlier: http://www.phearable.net/tech/efibeginnerguide.html

 

K, I re-read it. Actaully I have read that before it was posted in this thread, but I read it again in case I missed anything. So yea it did say that if you lean out the fuel, it will advance the timeing, increase fuel, it will retard the timeing. It also said that is why it creates an issue when people boost. I'm not boosting, and dont plan too. So there is still an un answered question. Why does my car run better with the VAFC if my timing is advanced? That just doesnt make sense? My thoughts are that when tuning an N/A build, your not going to lean out the fuel enough to advance the timing, which is why my car runs better. (smoother powerband, stronger vtec, more power) Once again its not like a squirt a nos, but my cars engine performance is better than it was before. Please explain...

 

I bet after driveing the car a few weeks or more put that car back on the dyno it will loose the power it made, it's because OBD2 will detune it back to stock or as clost to it. until you disconnect the battery to erase the memory so your mods work like it should. some have the memory wire disconnected for this reason.