DIY tuning

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houtan

Corporal
Nov 2, 2017
183
fuel pump? port injection? meth?
I want to stay 93 with 3 gal of Ethanol (E20 ish) . Which means 19 psi and 9 ish timing max. I'm early N55 with the late N54 HPFP.
Also, I'm road track / Autocross oriented, so straight line tuning doesn't excite me. Meaning, temps will be a concern and available fuel in large quantities.
Same. Early n55. I can run that boost and timing on E30 and the logs look pretty good. I bumped up to e40 a few days go to get a littl more octane and that was enough to crash rail pressure.

I did have charge pipe meth which resolves everything, even on 91. But I removed the system.

I am going to try this stuff called boostane tomorrow. For very cheap, it is supposed to bump my ACN 91 to 97 octane. Will post back my results but I am hoping it works so I’m not at the brink of the fuel system.

what afr are you running on the track? Would love to drive COTA one day.
 

naschine

New Member
May 2, 2019
6
I'm in the same boat! Early N55 DCT E82, M4 flywheel and LM600 turbo about to be installed this winter. Would love to be able to self tune.

How does the public available 98G0B XDF hold up though? Can't imagine (or better: I'm pretty sure) that there wasn't any improvements made in the last two years.

Since most (if not all?) of the XDF development was made by Justin, I'll probably want him to tune my car.
 
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houtan

Corporal
Nov 2, 2017
183
I'm in the same boat! Early N55 DCT E82, M4 flywheel and LM600 turbo about to be installed this winter. Would love to be able to self tune.

How does the public available 98G0B XDF hold up though? Can't imagine (or better: I'm pretty sure) that there wasn't any improvements made in the last two years.

Since most (if not all?) of the XDF development was made by Justin, I'll probably want him to tune my car.
Actually, there has been a lot of development on the Xdf by @Sbrach at wedge performance. He developed the HPFP tables that made it into the MHD ots ethanol maps for early e series. Of course, I don’t think they were added to the public Xdf. Not sure why, we would have to ask MHD. He has also done much more development on the Xdf that only he has, which is why I would use him for a e-tune. You can also find logs of his tunes to see how well cars are running.
 

houtan

Corporal
Nov 2, 2017
183
Looking for input on a weird timing issue i have been seeing post M4 flywheel install as i turn up the boost bit by bit. I have reached out for input separate from this thread, but thought it would be good to post here to get inputs from others as well as so others can learn in case they run into a similar issue.

I started noticing something weird with my timing advance on my 20ish psi tune, where in the mid to upper rev range, my timing suddenly drops significantly or to zero, however, there is no timing corrections. I thought maybe it was too much boost for the octane or plug gap, so I loaded my 17ish psi tune, and the same thing was happening. This was happening on E30 every once in a while, but the log i am going to show you is on 97octane (ACN91 plus Boostane to get to 97 octane). I do think the drop was a little smaller on E30.

Since it was occurring on both tunes, i thought maybe my spark plug gap of .026 was to blame or maybe my coil packs. Taking things one thing at a time, i decided to do the easiest thing first which is reducing the spark plug gap. So i pulled the plugs and gapped them down to .020 (plugs are the one step colder NGK 97506 SILZKBR8D8S). My coil packs are the originals that came with the car, 56,000 miles on them. So this is my log after reducing the spark plug gap, could you please take a look?: https://datazap.me/u/houtan/acn91-rev14d?log=0&data=4-17-21-22-28-29-30-31-32-33-34-35&solo=34-35

The dip in timing advance is still occurring but there are no timing corrections when that happens. Do you know what that means and why it is happening? Is that engine knock? Or am i loosing spark (spark blowout)? Is my octane too low? Would appreciate any inputs from the experts out there.
 

Bnks334

Sergeant
Dec 1, 2016
449
New York
Looking for input on a weird timing issue i have been seeing post M4 flywheel install as i turn up the boost bit by bit. I have reached out for input separate from this thread, but thought it would be good to post here to get inputs from others as well as so others can learn in case they run into a similar issue.

I started noticing something weird with my timing advance on my 20ish psi tune, where in the mid to upper rev range, my timing suddenly drops significantly or to zero, however, there is no timing corrections. I thought maybe it was too much boost for the octane or plug gap, so I loaded my 17ish psi tune, and the same thing was happening. This was happening on E30 every once in a while, but the log i am going to show you is on 97octane (ACN91 plus Boostane to get to 97 octane). I do think the drop was a little smaller on E30.

Since it was occurring on both tunes, i thought maybe my spark plug gap of .026 was to blame or maybe my coil packs. Taking things one thing at a time, i decided to do the easiest thing first which is reducing the spark plug gap. So i pulled the plugs and gapped them down to .020 (plugs are the one step colder NGK 97506 SILZKBR8D8S). My coil packs are the originals that came with the car, 56,000 miles on them. So this is my log after reducing the spark plug gap, could you please take a look?: https://datazap.me/u/houtan/acn91-rev14d?log=0&data=4-17-21-22-28-29-30-31-32-33-34-35&solo=34-35

The dip in timing advance is still occurring but there are no timing corrections when that happens. Do you know what that means and why it is happening? Is that engine knock? Or am i loosing spark (spark blowout)? Is my octane too low? Would appreciate any inputs from the experts out there.
Looks like a torque reduction (limiter) at play? There are two other limiter pids you can try logging.

It's got nothing to do with spark plugs. Knock feedback would be seen as timing corrections. "Spark blowout" would be felt as misfires. Not an ignition related issue. I don't know the logic but looks like a tuning thing. Might even be an intentional part of the tune.
 
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houtan

Corporal
Nov 2, 2017
183
Thanks. I am hoping it's a tuning thing, but i am outside of my knowledge at this point so hopefully someone can point me in the right direction. I have dialed back boost (18psi) and timing (8ish) for now and timing doesn’t dip like that anymore. Also upped the boostane to get to 99 octane.
 

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