Yeah. Dont forget, in additon to mass-calcs, its also often used in timing adjustment Thaddo... usually pre-emptively reducing timing a bit.
That's a homebrew hackers (and many pros) favorite trick. Stick the IAT in some ice cold location way up in the front bumper. Bottom line is it tricks the ECU into keeping timing where it would normally pull it. It's a sorta-way to add timing without (bothering to / learning how to) actually adding timing to the tune.
To be fair, sensor heat-soak IS a real thing and IS a fair enough reason to re-lo the IAT somewhat, but in my highly scientific GG statistical research studies (using our patented rectoextraction calculation techniques) most of what guys are getting excited about is the fake-o effect, and because you've thrust it into some place way out of the actual intake plenum temperatures... and not because of it fixing the 20-30%-whatever% of the time its true heatsoak.
Ideally the IAT is actually IN the manifold, but is invincible to heatsoak, and you then tune aggressively to those temps, knowing they are reliable. But since heatsoak invincible sensors seem to be not practically realistic... and because IAT re-lo feels good to the buttyno... we have the frenzy for IAT re-lo...
2003 M3CicM6 TiAg
2002 540iT Sport Vortech S/C 6MT LSD TiAg
2008 Audi A3 2.0T DSG (the daily beater)
2014 BMW X1 xDrive28i (wifemobile)
Former:
1985 MB Euro graymarket 300SL
1995.5 Audi S6 Avant (utility/winter billetturbobattlewagen)
Yeah, I can see that at least should be part of the strategy. For the M5.2 I never really found anything done with the IAT other than offsetting the output of the MAF, so that led me to conclude I should just place it in a location where it would be registering a temp very similar to what the MAF would be seeing.
Which actually does bring up an interesting point related to the timing issue. Timing values are derived from load and RPM, and load is derived from airmass and RPM... Anyway, if the IAT isn't giving the DME a signal that correctly offsets the MAF signal according to temp, then it's timing that would be effected in addition to the pulsewidth, but not necessarily in the direct "hotter IATs deserve reduced ignition advance" sort of a way.
It's too late in the day for my brain to be capable of pondering just which direction these considerations would lean, especially without opening up WinOLS and finding that MAF temp offset table. Ugh! This really made my brain hurt.
I finally get to drive my car, I've put about 1000 miles on it so far, and then I get a 90 mile ride on a flatbed,
I was passing a truck, screaming down the road, then p1357 pops up, dead #8 cylinder, about 10 seconds later complete ignition failure.
IMG_1033.jpg
I had a set of coils in my shopping cart the day before and decided not to buy them, today I ordered a set of bosch coils,
IMG_1034.jpg
IMG_1035.jpg
E85 fueled, Eaton m112 supercharged 4.5L M62TU, TTV racing flywheel, Spec stage 2+ clutch, 88c thermostat, eibach sway bars, wavetrac 3.15 lsd, m5 steering box, Quantum 340lph fuel pump, Dinan camber plates, some powerflex bushings, Supersprint headers, M5 cats, 2001 gas pedal upgrade and many other things done. all diy by me
Never saw a coil melt like that! Nasty nasty. Glad to hear it was running good! Up to that point....
98 540i 6, 525 whp, 120 mph 1/4, V3 Si S/C'er @16 psi, W/A I/C, Water/Meth, Supersprint Headers, HJS Cats, 3" Custom Exhaust, UUC Twin Disc, Wavetrac LSD, GC Coil Overs, Monoball TA, AEM FP, Aeromotive FPR, AEM Failsafe AFR/Boost, Style 65's w/275's, M5 Steering Box, Eibach Sways, M3 Shifter, Evans Coolant, 85 Deg Stat, PWM Fan, 10" Subs, B.A. speakers, Grom Aux/BT, Still Rolling as my DD!
Looks like an alien space creature.
Wow!!!
It will be interesting to see if a fault in the DME caused that by over-dwelling that coil, or if that coil going bad somehow caused the shut down of the ignitions system...
Last edited by tptrsn; 11-29-2017 at 06:02 PM.
E85 fueled, Eaton m112 supercharged 4.5L M62TU, TTV racing flywheel, Spec stage 2+ clutch, 88c thermostat, eibach sway bars, wavetrac 3.15 lsd, m5 steering box, Quantum 340lph fuel pump, Dinan camber plates, some powerflex bushings, Supersprint headers, M5 cats, 2001 gas pedal upgrade and many other things done. all diy by me
Might want to pull the cover off the DME and look at the coil drivers.
DME7.2c.JPG
E85 fueled, Eaton m112 supercharged 4.5L M62TU, TTV racing flywheel, Spec stage 2+ clutch, 88c thermostat, eibach sway bars, wavetrac 3.15 lsd, m5 steering box, Quantum 340lph fuel pump, Dinan camber plates, some powerflex bushings, Supersprint headers, M5 cats, 2001 gas pedal upgrade and many other things done. all diy by me
I would love to see a shot of the top of your engine now Jim. Do you have some in a thread or something?
There's a thread of it, not sure if the pics are still posted as Comcast decided to dump free hosting a few years ago.
Sorry to hijack your thread 540i M.
The start of the rewiring to bank 2 and relocating the wires that run down the front of the engine from bank 1.
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2014_78.JPG
After painting the intake Ti Silver, too much black under the hood. Silver never looks dirty.
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Eng2.JPG
Thanks Jim, that looks amazing!
I think I would like to get rid of the wiring boxes at some point. They are kind of a pain... (as much as I change injectors and whatnot)
I know right? Hate those boxes!
That silver intake is really sharp Jim
98 540i 6, 525 whp, 120 mph 1/4, V3 Si S/C'er @16 psi, W/A I/C, Water/Meth, Supersprint Headers, HJS Cats, 3" Custom Exhaust, UUC Twin Disc, Wavetrac LSD, GC Coil Overs, Monoball TA, AEM FP, Aeromotive FPR, AEM Failsafe AFR/Boost, Style 65's w/275's, M5 Steering Box, Eibach Sways, M3 Shifter, Evans Coolant, 85 Deg Stat, PWM Fan, 10" Subs, B.A. speakers, Grom Aux/BT, Still Rolling as my DD!
I'd also love to dump the wiring boxes too. Thought about it a lot when I was rewiring the engine.
Just need injector and coil wires. The wiring at the front of the engine could go under the manifold.
Got my new coils today, made a major difference in idle smoothness! and much smoother at 2500 rpm, even seems to rev quicker
I checked the DME for heat damage, all looks good
IMG_1037.jpg
The spark plug looks good to me, What do you experts think?
IMG_1041.jpg
E85 fueled, Eaton m112 supercharged 4.5L M62TU, TTV racing flywheel, Spec stage 2+ clutch, 88c thermostat, eibach sway bars, wavetrac 3.15 lsd, m5 steering box, Quantum 340lph fuel pump, Dinan camber plates, some powerflex bushings, Supersprint headers, M5 cats, 2001 gas pedal upgrade and many other things done. all diy by me
I personally don't see anything obviously wrong with that plug, but a lot of what you'd be looking for will only be seen with careful focus, lighting, and magnification:
vlcsnap-2017-11-25-19h24m13s717.jpg
For example, and even this one doesn't properly show down in the plug along the side of the porcelain.
E85 fueled, Eaton m112 supercharged 4.5L M62TU, TTV racing flywheel, Spec stage 2+ clutch, 88c thermostat, eibach sway bars, wavetrac 3.15 lsd, m5 steering box, Quantum 340lph fuel pump, Dinan camber plates, some powerflex bushings, Supersprint headers, M5 cats, 2001 gas pedal upgrade and many other things done. all diy by me
That gap looks too big, I use 0,5-0,6mmOriginally Posted by 1999 540i m;29896889
The spark plug looks good to me, What do you experts think?
[ATTACH=CONFIG
E85 fueled, Eaton m112 supercharged 4.5L M62TU, TTV racing flywheel, Spec stage 2+ clutch, 88c thermostat, eibach sway bars, wavetrac 3.15 lsd, m5 steering box, Quantum 340lph fuel pump, Dinan camber plates, some powerflex bushings, Supersprint headers, M5 cats, 2001 gas pedal upgrade and many other things done. all diy by me
He's saying the gap looks big in general I think. As in it might have been set to normal specs for an N/A use? Around .035"-.040" maybe?
.5mm-.6mm is in that .020"-.025" range that I like to use for turbo setups, but the one I posted in the picture above was actually set at about .015" (.38mm).
Last edited by 1999 540i m; 12-02-2017 at 02:18 PM.
E85 fueled, Eaton m112 supercharged 4.5L M62TU, TTV racing flywheel, Spec stage 2+ clutch, 88c thermostat, eibach sway bars, wavetrac 3.15 lsd, m5 steering box, Quantum 340lph fuel pump, Dinan camber plates, some powerflex bushings, Supersprint headers, M5 cats, 2001 gas pedal upgrade and many other things done. all diy by me
I use 0.026" on my iridiums.
98 540i 6, 525 whp, 120 mph 1/4, V3 Si S/C'er @16 psi, W/A I/C, Water/Meth, Supersprint Headers, HJS Cats, 3" Custom Exhaust, UUC Twin Disc, Wavetrac LSD, GC Coil Overs, Monoball TA, AEM FP, Aeromotive FPR, AEM Failsafe AFR/Boost, Style 65's w/275's, M5 Steering Box, Eibach Sways, M3 Shifter, Evans Coolant, 85 Deg Stat, PWM Fan, 10" Subs, B.A. speakers, Grom Aux/BT, Still Rolling as my DD!
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