NefMoto

I am trying to make a B6 A4 1.8t with a 3071 run correctly. Its just on spring pressure, 18 psi at the moment.

I was able to record one cleanish pull, but ever since it will get to 36-3700 rpm and break up so bad it will not accelerate. Even if driven gently.

The file I made is relatively simple with a swap to the 225 TT IRL IOP maps and matching LDRXN to allow for the base spring pressure. I pulled 3-4 degrees timing and deleted some emissions( CAT, SAI, N249 and N80). Fueling is siemens 60lb dekas and a B5 S4 bosch maf. I also did a returnless to return conversion to allow for fuel pressure rise with boost.

I basically snagged this car for a steal with rods and grabbed a big turbo to complete the project. I started with the .bin included because I got the car still running an APR Stg1+ and a blown K03.

Is there something I am missing that would limit rpm? Timing, AFR and maf look normal to the break up point, then maf takes wild swings and all hell breaks loose. I have not tried a new maf yet, but I have tried running without it. No change. Just looking for some insight or BTDT before I start swapping back to stock parts. My gut keeps pointing me to a crank vs cam timing issue, but even turning off the cam adjustment map, setting all to 18, made no difference.

Thanks for any/all opinions.

I attached the ori, modded bin, the "full pull" log 3 and the latest log from today.

You're way off the end of the MAP sensor, good luck debugging this w/o 5120 hack or a independent boost sensor. No way of knowing if your MAF is screwed up, or you have a failing BPV or some other boost leak.

Also, your accel pedal is <95% so ecuxplot filter doesn't work.

Oh, also, this is a perfect example of why you have to zero DSLOFS if you want to run off the end of the MAP sensor. Notice that lde will ALWAYS be positive, since max req boost can be higher than max map sensor reading.

If you don't know why this is bad, stop tuning :P

Thanks for the reply Nyet.

Im not using the N75 at all. The "good" pull was with a gate spring that is way too stiff. Since it has been swapped for an 18psi unit to stay below the map limit for the time being. On the bad log, i was just trying to get it gently past 4k. Still went crazy.

no point in doing any tuning until you get the wg setup properly.

Also, no matter what you do you have to keep the PID happy or you will throw codes *even if you are ignoring the PID output*.

It was a bad throttle body, changed default map for throttle failure rpm limiter from 3600 to 7200. Then it would pull properly. Not is doing much better, can finally dial in fueling and timing.