The neverending march of progress

[Alex L]

How low does your pulse-width on those monsters have to be to get it to idle?

i dont have my logs in front of me (shut the tablet off before i left this morning); i wanna say its around 1.5ms @ 1krpm. the dead time on these are huge, my base offset is something like .8ms. if i have base idle under 900rpm, it starts to hunt.

[Alex L]

wonderful day out today, and took 'er up to the store for beer a few minutes ago. starting to reach into 3/4 throttle without things going *BOOM*. this cam is wonderful, just pulls and pulls and pulls. the manual rack makes the front wheels feel like an extension of your hands.

metering with the 90mm maf is rock solid, now that i put the airflow straighteners in. need to plumb in the BPV soon. need to get the backflow fix merged into my .bin, sometimes it stalls out when comming to a stop sign after a good pull.

still got some rattles around the gearbox to find. and it sounds like the input shaft bearing on the gearbox is starting to howl.. louder. time to go tranny hunting again..

PW @ idle is 1.2~1.5ms. the kicker is, so far it still fires on the first crank, hot or cold. <3 technology.

when i get a chance, its time to take the last pair of dinged up SVO wheels to the wheel repair shop, then its time for some serious track rubber...

[Raven855]

I have been asleep, what is your setup. Any pics yet?

[Alex L]

from intake to exhaust:
90mm lightning MAF
holset HY-35
stinger FMIC
stock TB
stock 84 intake
83pph injectors
backyard ported head
boport 1.9 cam
e6
3" downpipe, 2 chamber flowmaster

ill pull some pics later today, been to busy wrenching to stop and take pictures

[Alex L]

some pictures.

[Raven855]

Nice pictures and interesting project.

[Alex L]

thanks raven!

took the 84 for a drive for mother's day. got some serious back flow issues when coming to a stop after thrashing it. which sucks, cause caroth's bins dont have the airmass clip fix and i dont have a clue how to patch hex in be2010.

so tonight i get to play with the stock LA3_MAF.bin. last time i tried it, the fuel pump wouldn't shut down. hopefully the MAF airflow clip function doesnt overlay the extended MAF transfer function. i really really want my 50 point MAF transfers back

[Alex L]

backflow issue resolved. think i also have enough room to run out the MAF to 50 pts once the next build of binary editor is released.

of course, the new bin is slightly different then the one i was using from caroth. still have some tweaking to do in the IAC functions, and the fuel scalars, but its getting pretty close.

but now, its supposed to rain for the next few days. might give me a chance to flush the fluids in the drive train and see if i can get it to quiet down a bit...

[Alex L]

added half a quart to the rear end, quieted things down a bit. after crunching the data logs, the adjusted maf curve is REAL close to the stock 90mm transfer curve so i dropped the stock curve in, flipped on 'force open loop at idle', and viola! purrs like a kitten. trimmed down the injector offset to get idle -> pt transfer steady.

WOT pulls with the stock MAF transfer hit 11.5 right out of the gate @ 12psi.. but i still have an oil control issue from what im presuming to the valve cover and rear main... hits the cat when it drips and causes all sorts of smoke. gonna get a http://www.summitracing.com/parts/SUM-120108/ and run dedicated lines from the crank and valve cover to get some positive evac. if that dont fix it, guess its getting pulled and new seals going in. if that dont fix it... well, ill cross that bridge when i get to it.

bumped the idle up to 1100, 1000 would sometimes die while comming to a stop and i couldn't get it trimmed out using backflow clip. had to muck with it to keep it from flooding on decel, but this seems to work well with my combo

16384	7.0
4000	4.0
2500	2.5
2000	1.8
1500	1.2
1000	1.0
0	0.8

im sure that will get changed once i get the BPV plumbed back in. also tweaking on 'IAC - Desired Idle Airflow in Neurtal' and 'IAC - Desired Idle Airflow in Drive' to be

16383.0	3.94
2500.00	3.94
2000.00	4.40
1500.00	3.00
1200.00	1.60
700.00	1.30
0.00	0.00

now the 1.9 softly glides to idle, rather then falling to idle, missing by 500 rpm, stumbling for a few moments, and then hunting between 1500 and 800 for a few seconds... still bucks a bit at 1500 when idling down, so still need to futz with IAC - Desired in Drive a bit

[Erics SVO]

Nice! Sounds like your getting there!

[Raven855]

Good info Alex. You are getting this tuning thing down pretty well it sounds like.

[Alex L]

Eric, Raven, thanks! its a bit of a learning curve, but i think im making a bit of progress. there is so much information out there in different places that its hard to track down things.

tuning changes today:
AFR hunts a bit at idle, expected with a lumpy cam, but increased # MAF samples to avg at idle from 3 to 7, and it seems to have smoothed a bit.

now my issue is that i appear to be hitting a airmass clip at 32lb/min. load was only 2.5, so its not a load clip. all my airmass clip bypass flags are set. *shrugs* time to start digging through the archives.. already hitting 3.8v on the maf, and i still haven't put the boost controller back in.

[Alex L]

la3. was using roth's bin, but then switched to johnk's (i think, it was from the binary editor site) for the backflow fix.

i couldn't find where things were being doubled in this bin, the injector size is set to have 112max, so im presuming its in the logic somewhere...

had some initiative and installed the exhaust evac system; now my dipstick is blowing out.. AGAIN. time to break out the leak down kit and see where the bores are, and if its even worth dicking around with...

[Alex L]

fixed the crankcase pressure issue. just required a slight modification to the PCV system (aka: gutting it)

also, seems like that fall-on-its-face-at-32lb-airflow was a non issue. closed loop at cruse was trimming the fuel richer, causing WOT to go hard fat < 10:1. my 2.7-3.0 load bins are targeting 11:1 already, so its a short jaunt from 'slightly richer then RBT' to 'wadda trying to do, hydrolock the engine?'. just happened that it freaked out right at 32lb/min. datalogs up to 35LB airflow show rock soild 11:1 now.

[Alex L]

Is that white thing at the front with all the hoses where the 'shine comes out??

no, that's what the coke bottle behind it is for!