the "dbsharp is gonna learn how to tune" thread

[d112crzy]

The eld is in the fuse box.

I always disable it and I've never had the problems you are having.

[MRX]

oh wait, i was thinking PA sensor

[dbsharp]

I am going to try it because I wanna see what happens, but I do plan on trying to find a properly functioning one in a junkyard and using it. In the mean time, I'm going to hook up a dc ammeter and find out how the ecu manages the alt with eld disabled. I think I'm getting a fairly large voltage drop over the ignition switch, and I have noticed that things dim and what not when I use lots of switched power, I will know for sure tonight when test it, I will be replacing that if it is the source of the drop.

I have decided that until I have the injector offset problem figured out I will be tuning in open loop only while the current draw is low, (I like to eliminate as many variables as possible), and using the o2 sensor while using the map. Using the o2 sensor keeps afr's good under high current draw. *This is not a permanent solution, and I plan on fixing this situation as soon as possible.*
disabling eld does not seem to help fix the leaning out issue.

[d112crzy]

any further advances?

[dbsharp]

i'm waiting on my new fuse box to come in. the ignition switch is not bad. cams have been ground and are on the way here. My afr's are getting pretty decent. one thing that has me confused is when my car is in closed loop operation, when I first start it up it idles way lean untill I drive it a little way's then after that it is 14.7, I do not understand how I can be idling at 16.5 afr in closed loop at idle. is this a fault of crome or is this just more evidence that something my be wrong with my car? also once while logging, my low load/rpm area of the map was a lot leaner than it had been with just very small changes to the map. I'm wondering if maybe I have another problem besides eld. I'm going to the track tomorrow, I hope to get some decent times.

[MRX]

could be the differences in changes in air temperature, coolant temps, and the amount of 02 feedback you have going in.

[d112crzy]

Adjust the ECT vs IAT tables to get cold idle afr down.

[dbsharp]

it does this while at normal ect and constant iat too. A friend of mine said to check the fuel pressure regulator. It only does it right after I start it up, and then when I drive it, even after 1 block it acts normal. I just don't understand the one instance where It went from 14.7 to 15.5+ in the low fuel consumption area of the map with nothing changing except for very minor tweaks in the fuel map. radiator fans were off, this was in open loop, same day, temp, etc....
I think Im going to try advancing wot timing just a bit for a few passes while at the track to see if it improves my trap speed. I would think that I could get close to finding mbt this way. And of course I would be using my det can while doing this.

[dbsharp]

also my motor doesn't like the timing it is set at right now below 2k. I have just been avoiding this area while driving. it just bucks a little, I will address this situation when I have time, right now I focused on getting afr's solid as a rock.

[MRX]

also my motor doesn't like the timing it is set at right now below 2k. I have just been avoiding this area while driving. it just bucks a little, I will address this situation when I have time, right now I focused on getting afr's solid as a rock.

bad plan, timing adjustments can effect afr's

[d112crzy]

Yup. Even at idle. Going from 18* down to 15.5* made a difference of about .6 afr.

Maybe it's less with lower compression engines. Just got done tuning a turbo gsr a few minutes ago and that's how it was with this particular engine.

[dbsharp]

bad plan, timing adjustments can effect afr's

yes I know this. I am not too worried about this because the area of the map that I am most focused on is not the area the need timing work. I will be messing around with the timing below 2k a bit, but afr's are good there now and I don't think that retuning that would take long at all. To be perfectly honest I'm too terribly worried about the tune I have right now because it is pretty decent and In less than 2 weeks Ill have a 272 regrind and I will have to retune then anyways. right now is sortta just practice for me. I am excited about getting to go to the track tomorrow. I wanna see what this thing can do now before the delta cams so I can see how much I gain.

[dbsharp]

DAMMMIT!!!!! Im not going to get to go to the track today. My alternator kicked the bucket today. It pulls on the motor and as a result gives me a little back massage. This could explain some of the weird problems that I have been having. I have the alternator that came on my f22b2 and it tested good at work, my old alt put out 20 amps and failed the lamp/diode test. so I'm gonna switch em out. My fuse box will be in on monday so I hope to have the electrical problem fixed soon. My ELD kept the alternator charging constantly before and never let it go into low charge mode, so I can see how that might cause a premature death.

[dbsharp]

I keep on blowing exhaust gaskets! It did not do this on the stock jdm p39 ecu. since I cannot find a replacement gasket, I am using this mr gasket exhaust gasket material that comes in a white sheet to make a gasket. I have been using this material for a long time, on the stock ecu I never had to replace it untill I started tuning with crome. I blew a gasket tonight right after doing continuous wot runs, I made this gasket 2 days ago. Should I be worried about my egts possibly? Or is this gasket material just crap? I might just take this header to my welding class next friday and weld it up tight.

[dbsharp]

I got some good quality gasket material now and It should hold up now. The problem with my car leaning out when under a heavy electrical load seems to be gone. I have changed the alternator since I last paid attention to this so I think that fixed it. I got my fuse box and cams today so those will be installed very soon. I'm getting a decent amount back on taxes, so suspension mods might also come soon.