IMAPCalcs is affecting WOT load calc. - EvoXForums.com

UT_EvoX · 01-15-2013, 08:32 PM

I'm posting this up in a public setting for the benefit of other tuners.

I've been chasing down a high RPM break up on my car and after several attempts at debugging my ignition system, I came to the realization that it may have something to do with load calculation, judging from the spikes I saw in my IDC graph.

I investigated further on the dyno and found that I get momentary dips in my load calculation which causes fueling to be disrupted and leads to minor misfires and break up in the upper RPM range (or at least must be contributing).

What I found is that each dip corresponds with a spike in IMAPCalcs up to 270-ish load when my MAP-calculated load is well over 300.

I have MAF calculation disabled above 3 V by having the MAF calibration values maxed out above that voltage in my MAF calibration map (i.e. hybrid speed density).

I've seen datalogs from hybrid or full speed density setups that do not have spiky load graphs at WOT, and was wondering what I've done wrong or what I can rectify to keep the IMAPCalcs (mind you, I have no idea what that value actually *is*) from affecting my MAP calculation.

Rich? Baka? Chet? Dino? Hollywood? Golden? tephra?

chetrickerman · 01-15-2013, 09:08 PM

How much boost are you running?

UT_EvoX · 01-15-2013, 09:14 PM

Quote:

Originally Posted by chetrickerman

How much boost are you running?

Over 9000.

This is happening worst in 4th gear during a quarter mile pull where I'm running 30 psi tapering to 29 on my 6262.

On a full pull, boost tapers from 34 psi to 29 psi.

Load is roughly 330-310.

richardh · 01-16-2013, 06:05 AM

Yeah, I know this. Tephra pointed me at it. I did some experimenting on my own RA... and recently rolled the tweak into the latest Ralliart Base Maps.

What's your ROM ID?

I'll post up the address of "Load multiplier end when TPS decreased by % (hysteresis)" for your ROM. You can change it from 0.4 to 0.8.

That should stop MAPCalcs and IMAPCalcs from bouncing around.

Rich

drkramm · 01-16-2013, 10:17 AM

any love for 56890013 rich ?

richardh · 01-16-2013, 02:57 PM

UT_EvoX, you're on 52680122, aren't you.

Done. GoldenEvo.com is now updated to deliver this new item. It's updated for 52680015, 56890013, plus a bunch of Ralliart ROM IDs.

Once you've updated your XML, change "Load multiplier end when TPS decreased by % (hysteresis)" from 0.4 to 0.8. Let me know how it goes.

Cheers,

Rich

UT_EvoX · 01-16-2013, 03:03 PM

Rich, thank you sir. I'll be trying this out today!

I'll also see if it makes any difference on the dyno and report back. It's hard to get any high-speed pulls when it's 9 degrees F outside, so the dyno is my best friend right now.

black e · 01-16-2013, 08:05 PM

Damn, I got left out

drkramm · 01-16-2013, 09:27 PM

Quote:

Originally Posted by richardh

UT_EvoX, you're on 52680122, aren't you.

Done. GoldenEvo.com is now updated to deliver this new item. It's updated for 52680015, 56890013, plus a bunch of Ralliart ROM IDs.

Once you've updated your XML, change "Load multiplier end when TPS decreased by % (hysteresis)" from 0.4 to 0.8. Let me know how it goes.

Cheers,

Rich

you rock.
thanks

Kooldino · 01-16-2013, 09:39 PM

Quote:

Originally Posted by chetrickerman

How much boost are you running?

Quote:

Originally Posted by UT_EvoX

Over 9000.

Damn, son.

01-15-2013, 08:32 PM	#1
UT_EvoX Forum Lackey Join Date: Jan 2011 iTrader: (100) Location: Utah Posts: 1,792	IMAPCalcs is affecting WOT load calc. I'm posting this up in a public setting for the benefit of other tuners. I've been chasing down a high RPM break up on my car and after several attempts at debugging my ignition system, I came to the realization that it may have something to do with load calculation, judging from the spikes I saw in my IDC graph. I investigated further on the dyno and found that I get momentary dips in my load calculation which causes fueling to be disrupted and leads to minor misfires and break up in the upper RPM range (or at least must be contributing). What I found is that each dip corresponds with a spike in IMAPCalcs up to 270-ish load when my MAP-calculated load is well over 300. I have MAF calculation disabled above 3 V by having the MAF calibration values maxed out above that voltage in my MAF calibration map (i.e. hybrid speed density). I've seen datalogs from hybrid or full speed density setups that do not have spiky load graphs at WOT, and was wondering what I've done wrong or what I can rectify to keep the IMAPCalcs (mind you, I have no idea what that value actually is) from affecting my MAP calculation. Rich? Baka? Chet? Dino? Hollywood? Golden? tephra? __________________ '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

01-15-2013, 09:08 PM	#2
chetrickerman [Music Mod] [FS Mod] [E-Tuner] Join Date: Dec 2008 iTrader: (100) Location: Colorado Springs Posts: 12,253	How much boost are you running? __________________ < 3000 lb Evo 10 w/ full tank Interested in Sakura Performance parts? shoot me a pm RIP mlomker PM me if you are interested in a E-Tune or Road tune

01-16-2013, 06:05 AM	#4
richardh [Gearhead] Join Date: Sep 2010 iTrader: (0) Location: Australia Posts: 564	Yeah, I know this. Tephra pointed me at it. I did some experimenting on my own RA... and recently rolled the tweak into the latest Ralliart Base Maps. What's your ROM ID? I'll post up the address of "Load multiplier end when TPS decreased by % (hysteresis)" for your ROM. You can change it from 0.4 to 0.8. That should stop MAPCalcs and IMAPCalcs from bouncing around. Rich __________________ ________________________________________ Lancer Ralliart. It's a computer game... with wheels! //////////

01-16-2013, 02:57 PM	#6
richardh [Gearhead] Join Date: Sep 2010 iTrader: (0) Location: Australia Posts: 564	UT_EvoX, you're on 52680122, aren't you. Done. GoldenEvo.com is now updated to deliver this new item. It's updated for 52680015, 56890013, plus a bunch of Ralliart ROM IDs. Once you've updated your XML, change "Load multiplier end when TPS decreased by % (hysteresis)" from 0.4 to 0.8. Let me know how it goes. Cheers, Rich __________________ ________________________________________ Lancer Ralliart. It's a computer game... with wheels! //////////

01-16-2013, 03:03 PM	#7
UT_EvoX Forum Lackey Join Date: Jan 2011 iTrader: (100) Location: Utah Posts: 1,792	Rich, thank you sir. I'll be trying this out today! I'll also see if it makes any difference on the dyno and report back. It's hard to get any high-speed pulls when it's 9 degrees F outside, so the dyno is my best friend right now. __________________ '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

01-16-2013, 10:17 AM	#5
drkramm Just Spooling Up Join Date: Apr 2012 iTrader: (0) Location: pa Posts: 531	any love for 56890013 rich ?

01-16-2013, 08:05 PM	#8
black e Just Spooling Up Join Date: Aug 2011 iTrader: (100) Location: Boca Raton FL Posts: 505	Damn, I got left out

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