IMAPCalcs is affecting WOT load calc. - Page 3 - EvoXForums.com

jyamona · 01-17-2013, 01:24 PM

hey Rich, can you find this table for 55570006 too?

richardh · 01-17-2013, 02:18 PM

Done. I've also done a load more - all the RAX Patch supported ROMs, as far as I can see.

Rich

jyamona · 01-17-2013, 03:03 PM

Quote:

Originally Posted by richardh

Done. I've also done a load more - all the RAX Patch supported ROMs, as far as I can see.

Rich

you're the man!

UT_EvoX · 01-17-2013, 04:57 PM

Quote:

Originally Posted by richardh

Guys, if you change that hysteresis value from 0.4 to 0.8 and still get IMAPCalcs spikes at WOT, feel free to try 1.2.

Rich

I got a very small IMAPCalcs spike to 25 this morning, but only 1 and it didn't seem to affect my actual fueling.

Thanks again for helping with this.

sstevojr · 01-17-2013, 07:05 PM

Great info Rich!
Question,
It seems to me with a spot-on MAP calc (which all of us "extremist" types do) that IMAP serves no purpose but to bungle a well sorted fuel/timing Load map?
And 2, if I understand the hystersis table it allows for .4% TPS variation before applying an IMAP value (so we want to allow for 0.8 or 1.2% deviation to make it less sensitive)?

Murlo26 · 01-17-2013, 08:31 PM

Very interesting. Finally some stimulating posts.

Maybe I'll check this out in spring when I work on the fast logging stuff.

Kooldino · 01-18-2013, 03:00 PM

Quote:

Originally Posted by sstevojr

Great info Rich!
Question,
It seems to me with a spot-on MAP calc (which all of us "extremist" types do) that IMAP serves no purpose but to bungle a well sorted fuel/timing Load map?
And 2, if I understand the hystersis table it allows for .04% TPS variation before applying an IMAP value (so we want to allow for 0.8 or 1.2% deviation to make it less sensitive)?

If that's the case, then would there be any real disadvantage to increasing it to .8% by default?

jyamona · 01-18-2013, 03:21 PM

Quote:

Originally Posted by Kooldino

If that's the case, then would there be any real disadvantage to increasing it to .8% by default?

I don't think so, no.

UT_EvoX · 01-18-2013, 04:25 PM

After logging for a day now, I would never recommend setting this value to anything but > 0.8%

I have no idea why it was set to 0.4% from the factory.

sstevojr · 01-18-2013, 04:50 PM

I would "guess" that the factory setting was so sensitive because of the gap between MAP and MAF. It's probably used to prevent what they would consider as "extreme" load calc swings.
Since most of us remove/narrow the load gap, it sounds like an unneeded safety feature at this point (much like the SST's " overboost exceedance" table); making it less sensitive would "seem" like a good idea for those who have a well sorted MAP/MAF relationship.

01-17-2013, 01:24 PM	#21
jyamona Forum Lackey Join Date: Jun 2010 iTrader: (100) Location: Northeast PA Posts: 2,444	hey Rich, can you find this table for 55570006 too? __________________ 2010 WW Evo X GSR w/ SSS BAKA tuned - 422/347 (retune pending), MAP EF3 ported / antisurge, Full-race manifold, ID1000's, DW65C, MAP O2/DP, ARK testpipe, ARK N-II v2 catback, 3" intake, ETS 3.5" FMIC and IC pipes, Grimmspeed 3-port, Tial QR, Swift Spec-R's, Whiteline RCA Kit

01-17-2013, 02:18 PM	#22
richardh [Gearhead] Join Date: Sep 2010 iTrader: (0) Location: Australia Posts: 564	Done. I've also done a load more - all the RAX Patch supported ROMs, as far as I can see. Rich __________________ ________________________________________ Lancer Ralliart. It's a computer game... with wheels! //////////

01-17-2013, 07:05 PM	#25
sstevojr X-phile Join Date: Nov 2011 iTrader: (100) Location: 805-Conejo Valley Posts: 1,028	Great info Rich! Question, It seems to me with a spot-on MAP calc (which all of us "extremist" types do) that IMAP serves no purpose but to bungle a well sorted fuel/timing Load map? And 2, if I understand the hystersis table it allows for .4% TPS variation before applying an IMAP value (so we want to allow for 0.8 or 1.2% deviation to make it less sensitive)? __________________ X-Swap Ralliart Sportback For the best game in So-Cal, it comes down to one name R /// R /// E The greatest gift to an engine: Continuously Variable Valving Next level sh!t: Continuously Variable Geometry (we all need dreams) Last edited by sstevojr; 01-18-2013 at 04:44 PM.

01-17-2013, 08:31 PM	#26
Murlo26 Forum Addict Join Date: Jun 2009 iTrader: (100) Location: Minnesota Posts: 8,783	Very interesting. Finally some stimulating posts. Maybe I'll check this out in spring when I work on the fast logging stuff. __________________ MAP T4 TS 6266/ERL 2.2L 10:1 CR/E85 BakaUnchi Tuned

01-18-2013, 04:25 PM	#29
UT_EvoX Forum Lackey Join Date: Jan 2011 iTrader: (100) Location: Utah Posts: 1,783	After logging for a day now, I would never recommend setting this value to anything but > 0.8% I have no idea why it was set to 0.4% from the factory. __________________ '08 Evo X GSR - self-built, self-tuned MAP block - X-beam rods, Wiseco slugs, stock sleeves \| Cossy MX1, BC springs AGP turbo kit - PTE 6262 \| Snow meth inj. \| ETS IC + piping Jack's upgraded trans + center diff \| CM FX400 clutch E85 VD: 700 WHP / 525 lb-ft \| 608 WHP Mustang Dyno, 91 + meth Build Thread - complete list of my build components and tuning experience and advice Lead Calibrator - Ziptie Dynowerks, Utah

01-18-2013, 04:50 PM	#30
sstevojr X-phile Join Date: Nov 2011 iTrader: (100) Location: 805-Conejo Valley Posts: 1,028	I would "guess" that the factory setting was so sensitive because of the gap between MAP and MAF. It's probably used to prevent what they would consider as "extreme" load calc swings. Since most of us remove/narrow the load gap, it sounds like an unneeded safety feature at this point (much like the SST's " overboost exceedance" table); making it less sensitive would "seem" like a good idea for those who have a well sorted MAP/MAF relationship. __________________ X-Swap Ralliart Sportback For the best game in So-Cal, it comes down to one name R /// R /// E The greatest gift to an engine: Continuously Variable Valving Next level sh!t: Continuously Variable Geometry (we all need dreams)

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