I'm having a little bit of a issue with my base tune in my set up my af gauge is pegged lean at over 18 and the BS3 reads maxed out at showing that it's lean, but it keeps taking out the plugs, but the plugs are black as coal showing rich. I've been messing with the fuel,timing,af tables but doesn't seam to be helping, now I'm probably being real careful as just learning this stuff. Fuel pressure is set at 50psi, timing is around 18, af table is programmed at 14.5. What am I doing wrong
Matt

 

Does a/f move from that value at all?

 

On the gauges it's reading 17.9+ lean the bs3 af gauge says 15.9, my turbo piping is not compleat yet I need the 2 pipes to finish off the air to water intercooler. With not having the air from the turbo going into the motor could this be causing my reading to be messed up cuz it's needing the air to help with the af for the amount of fuel it's currently getting?

 

Pretty sure your going to want to finish the system and then tune the car

 

I figured that is a lot of the problem, haven't really started it up anymore waiting till I get the pipes and the driveshaft back lol

 

Where is your air temp sensor located? How much 02 correction?? Have you run the car above 140 degrees like this?? If you wanna send me a datalog I can try and see whats going on?? If the air temp sensor is in the plenum, you should be ok with the charge pipe off to run at idle. It would be like tuning a n/a car with a slightly restrictive exhaust. lol

 

I have the Air temp sensor is in the plenum, the positive o2 is 4.7 at -6.8-4.9 then goes to 11.7 at -2.5 13.3 at -0.2 then 15.6 at 4.3.
What's your email I'll take a log and send it to you. It runs like poop with a low temp and high temp lol

 

Get your piping finished then start with tuning.

How is your oxygen sensor setup anyways? Does the BS3 have its own WB02? Do you have another oxygen sensor with a gauge?

 

The o2 are after the turbo one goes to the BS3 other goes to the AEM wideband, yeah I haven't messed with it much it goes up to get the intercooler piping finished then be ready to Dyno hopefully lol

 

Not that all these things matter, but lets just run through a short checklist.

What ignition are you running?
Plug Gap?
Is the car running poorly?
Is the A/F richer with new plugs and goes out after running for awhile?

What bothers me is that you have 2 widebands reading different things. I would love to see a 3rd one like at the dyno to see which one it agrees with. Have you done recalibrations according to the manufacturer?

 

I have LS coils on it
the plug gap is .20
The car runs poorly at times and them I mess with the timing and fuel table it will run ok and have good throttle response then right back to running poorly.
Not sure if getting 2 different readings on the o2's just think the AEM wideband goes to a higher value before it no longer reads 18:9 on the gauge but the BS3 only reads to 15:9 so they could be reading the same but the bs3 doesn't read as high?
Idk I'm still trying to figure this stuff out lol

 

I personally wouldnt run a plug gap that tight, especially with a decent ignition. I would set those to .026-.028.

While youre at it, are you cleaning the plugs or replacing?

 

I replaced the first 2 sets of plugs cleaned the 3rd set and out them back in, the gap was recommended by someone as a reference point on where to start they said .20-.25 so started at the lowest lol

 

I also don't recommend running that tight of gap unless absolutely necessary to control spark blow out..
Your just trying to get car to start and run so a much wider gap will help..

Does the a/f values change when running?

When is starts a/f should move quite a bit from the time it starts to when it's trying to idle.

 

Ok I'll open up the gap, yes the gauge will move when I get on the gas but sometimes it's so lazy take a few sec to get it to run rev up

 

send me that datalog...I'll get that car running!! lol

 

Yeah I haven't messed with it in the last few days lol, is their a certain way to send the logs?

 

When you log it creates a file...just email that file over to me. It'll be in your bigcomm folder

 

Any time you get a misfire regardless if it is a rich misfire, it will show lean on the wideband due to the unburnt oxygen in the exhaust. Its possible it is adding fuel on the misfire if you have ego correction on.

 

Well I think I'm going to pull the front cover off and check my timing left side or motor has 50 psi of compression and right side has over 100 psi of compression so I'm hoping the timing is just off and it's not the rings. The motor was put together about 2 years ago and now is getting the first starts on it. When I changed the oil their seamed to be a lot of gas in with the oil also