Tuning w/ N20 TMAP to see 22+ Boost

Jeffman

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Jan 7, 2017
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Your LPFP is a stage 2 ?
Yes.

Your fuel scalars may need some adjustments ...
Yeah possibly. But can't go any higher as fuel scalars are already 1.50 (Max) in the WOT range. And STFTs not maxing out at 34 so I think I'm good for now.
But I am wondering why my fuel scalars are so high. Even on 93 Octane I need fuel scalars of at least 1.10 - 1.15 to avoid lean codes. This started about 5 years ago after I first tried E85. Now I'm wondering whether I need to replace the O2 sensors (original, 9 years old now at 63K miles) based on recent posts talking about O2 sensors becoming "lazy" at 100K miles (or possibly age-related like mine).
 
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RSL

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Aug 11, 2017
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Yeah possibly. But can't go any higher as scalars are already 1.50 (Max) in the WOT range. And not flatlining at 34 so I think I'm good for now.
But I am wondering why my scalars are so high. Even on 93 Octane I need scalars of at least 1.10 - 1.15 to avoid lean codes. This started about 5 years ago after I first tried E85. Now I'm wondering whether I need to replace the O2 sensors (original, 9 years old now at 63K miles) based on recent posts talking about O2 sensors becoming "lazy" at 100K miles (or possibly age-related like mine).
80% boost request offsets? People use it push boost target and sometimes move load around, but it's actually a VE table. It effects MAF calcs and everything calculated based on it, like fueling.
 

Jeffman

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Jan 7, 2017
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@RSL, I'm sorry but I don't understand your comment in view of mine. Mine may have been unclear so I just edited it to better describe the situation about my fuel scalars.
 

RSL

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Aug 11, 2017
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@Jeffman Sorry, it means if you run low boost request offsets, you'll need to raise scalars (even on 93) to compensate for the change in calcs.
 
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RSL

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Aug 11, 2017
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Not sure if anyone has tried much less than 80%, but I'd only drop enough to achieve what you want/where you want and remember there's a trade-off. It probably only really only matters if it's causing other issues, like running out of scalars to get fuel back in check ;) Your boost/mean look well below target, so if you're running 80%, you have room to increase offsets (lowers boost target, increases load, increases MAF, decreases MAF request, decreases MAF request WGDC) and save yourself some scalar, except in the 3400-4000rpm range. Keep an eye there and make sure target doesn't reduce enough to check boost with your other current settings.

https://datazap.me/u/jeffman/e40-e50-wgdc-30-75f-flat-first-two-wot?log=1&data=2-3-4-16&mark=39-44

This is what 80% does to STFTs. Solid lines are with 80% boost request offset entire table, dashed lines are 98% boost request offset entire table. Other than BRO, maps are identical. EDIT: that's 93 octane.
bro_stft.png
 
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WOT808

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Jake@MHD

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Philly
I noticed my wgdc is a lot better using conventional wgdc logic vs using wgdc X setpoint

Honestly this is just a tuning problem. For stock turbos, the maf x setpoint is fine as it's basically set out of the box. With larger turbos, and ST, the rpm x setpoint is much easier :)
 

Jeffman

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Honestly this is just a tuning problem. For stock turbos, the maf x setpoint is fine as it's basically set out of the box. With larger turbos, and ST, the rpm x setpoint is much easier :)
Yeah. I'm thinking I may go back to maf x setpoint.
 

WOT808

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Aug 7, 2017
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Aside from the fuel, timing, and load req tables, what other tables are you changing when you're using the custom 3 point Tmap scaling?
 

tony@codewerx

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all4bspinnin

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Jun 12, 2017
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Would you make PID less invasive, since wgdc base should be pretty spot on after spool?

If your rpmxsp table is dialed in pretty well then yea, it'll be in the ball park. PID can still cause some oscillation if youre not close. Its one of those things that you'll need to do logs and work at it.
 
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WOT808

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@Jeffman, looks like you're having the PID drop issue with the TMAP scaled in the log posted on this page.
Have you found a way around it?
 

all4bspinnin

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@Jeffman, looks like you're having the PID drop issue with the TMAP scaled in the log posted on this page.
Have you found a way around it?

If PID goes flat to match your WGDC base table then that means PID has been under target for too long and has "timed out". To fix it, you can either lower load request or raise wgdc base