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[Liu]

Alright, had a couple days with clear streets and higher temps coming out of winter.

I'm currently at 130whp over stock on 93 octane at 19psi and some conservative timing. The car feels great but there is more to go. I'm having a little issue with something bringing down my load/torque targets that I am currently investigating. Really excited to get this thing back on the track soon!

I also brought down the throttle mapping as I found it WAYYYY too touchy with the oem values. It's so much better now, feels more linear. Much easier throttle control now.

View attachment 91069

Hi, I’d like to get your opinion on something I noticed.

With the same tank of fuel, same tune, same day, and similar intake air temps, I saw about a 20 Nm difference in torque between two logs taken just 10+ km apart. The load values were also different.

I’ve attached the two log screenshots below—what do you think could be causing this?

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[ColonelAdama]

Hi, I’d like to get your opinion on something I noticed.

With the same tank of fuel, same tune, same day, and similar intake air temps, I saw about a 20 Nm difference in torque between two logs taken just 10+ km apart. The load values were also different.

I’ve attached the two log screenshots below—what do you think could be causing this?

probably DA, the MAF is reading higher on one than the other.

 

[razorlab]

Hi, I’d like to get your opinion on something I noticed.

With the same tank of fuel, same tune, same day, and similar intake air temps, I saw about a 20 Nm difference in torque between two logs taken just 10+ km apart. The load values were also different.

I’ve attached the two log screenshots below—what do you think could be causing this?

Do you have links to the actual logs? At that RPM it could be just the difference between when you went WOT.

 

[razorlab]

Wanted to add these screenshots as I am going to do a little a write up around strategies that can be used when tuning for ethanol on a 100% stock fuel system B58TU.

This log is from a 6 port B58TU with a Pure800, 100% stock fuel system, E33 fuel. The tuning isn't finished yet, but it should give some hints of the tuning strategy.

I want to share the write up because I have been seeing a lot of false information about ethanol and stock fuel systems.

Stay tuned...

 

[Liu]

probably DA, the MAF is reading higher on one than the other.

Yeah, that could be a possibility. DA might have played a role here.

 

[Liu]

Do you have links to the actual logs? At that RPM it could be just the difference between when you went WOT.

Hi, thanks a lot for your reply. Here are the logs:
• Log1: https://www.bootmod3.net/log?id=68a146dabefad1374c0063ff
• Log2: https://www.bootmod3.net/log?id=68a3a4093a5c3a1d3e70e1bd
• Log3: https://www.bootmod3.net/log?id=68a4fa15eebaaf122a5c5f7f

About Log1 vs Log2:
Both are with the same tune. In Log1 (right after flashing) there was no overshoot. In Log2 (after ~300 km driving), once the boost reached the target it overshot by about 0.1 bar, sometimes controlled by throttle closure. Do you think this is mainly due to environmental changes, or could it be that the PID has some kind of “memory” and started to apply pre-correction?

About Log2 vs Log3:
Both were done on the same road, with very similar ambient temps. In Log3 the peak torque is about 20 Nm higher. The only change was that I increased some values slightly in the Compressor Map With Required Compressor / Turbine Output [kW] table. Do you think this adjustment could be the reason for the torque difference?

And one more question:
From these logs, do you see anything else that should be addressed? I feel my boost control is still not dialed in. Is it acceptable to allow a bit of overshoot and rely on the ECU’s throttle intervention to control it, or is it better to tune it out completely?

Thanks a lot for your time and any insights — your advice will be really helpful to me.

 

[razorlab]

The MHD XDF's didn't have WGDC I-Gain defined so I defined it in my BIN and shared on the MHD DIY Tuning FB group. Then a bunch of S58 guys asked if I could do it for their BINS so I ended up defining it for all S58 BINs and a bunch of B58 bins.

- To the angry self loathing dudes that like to throw around that I don't contribute, here is another GFY. Love you, smooches.

 

[razorlab]

Adding Engine Speed tables to the spreadsheet. Idle, Max RPM, etc. Currently on S58 and doing B58 next. I even made a little video walkthrough explaining the tables. You can listen to my sexy and captivating voice here:

Also been tuning some S58's and they really are cheat codes like everyone has been stating.

This particular M2 is tuned for track use. Only performance mods on this is a midpipe and a drop in air filter. Still has two OEM cats. With no fuel mods this has zero issue running E50 and a good amount of boost, 28psi out the top of the rev range. HPFP angle doesn't even hit over 100* (max of 126*) and IDC are around 85% only. Really impressive engine.

 

[ColonelAdama]

Also been tuning some S58's and they really are cheat codes like everyone has been stating.

S58 absolutely a cheat code lol, even on JB4
https://datazap.me/u/coloneladama/log-1759327768?log=0&data=1-4-11-14-18-25-26-27-28-29&zoom=114-148

Just midpipe and E30 on an otherwise stock car. >600whp easily

 

[razorlab]

S58 absolutely a cheat code lol, even on JB4
https://datazap.me/u/coloneladama/log-1759327768?log=0&data=1-4-11-14-18-25-26-27-28-29&zoom=114-148

I mean, other than missing about 8* of timing and lean AF AFR, sure.

I swear if I see another JB4 log with absolutely ass timing, lean AFR and people saying "LoOkS gOoD", I am going to not do anything and be a bigger man...

 

[ColonelAdama]

I mean, other than missing about 8* of timing and lean AF AFR, sure.

I swear if I see another JB4 log with absolutely ass timing, lean AFR and people saying "LoOkS gOoD", I am going to not do anything and be a bigger man...

I mean, theres no corrections lol. You know damn well I got everything I could out of that setup

 

[razorlab]

I mean, theres no corrections lol.

How can you share that log and then make that statement? JB4 gaslighting.

 

[ColonelAdama]

How can you share that log and then make that statement? JB4 gaslighting.

No need to attack me over a platform (which is used in far more S58s than MHD/BM3 btw). There's simply more demand for it. Topic was S58 tuning and I contributed.

I like this thread, so lets not tarnish it.

Its clean timing, not "no corrections", but rather "no corrections that actually lose power" to your point. Unnecessarily nitpicking over 1.5 deg

+ it only corrected because cyl fill dropped below target there and base timing changed.

 

[razorlab]

Dunno how that was attacking you. It was correcting you. Speaking of corrections.

The fact you added that is clean timing is all I need to know.

Yes, this is a self tuning thread, not a JB4 thread.

THIS is clean timing, 10 laps in...

Clean timing comes from actually being able to control timing and not just hopes and prayers.

 

[ColonelAdama]

Yes, this is a self tuning thread, not a JB4 thread.

Fair point, I will add S58 tuning info to my own then. Will be useful to about 100x more people than this thread.

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