5.7 tbi - larger cam tune advice needed

looking for any input on tuning info to make this thing not run rich and stall at idle---
car was a 5.0 tbi firebird---
installed a 350 with minor head work, 10-1 compression and a decent cam
.470 lift - 275/285 and 110 lobe separation..

I have antt bins and axkt bins -- is there a few small changes I can do to these bins to help the idle--- its way rich --
and I noticed these bins have base timing at zero ???? I usually run at 10*--
any advice appreciated-- or does anyone have a bin I could start with and modify ??? thanks- steve:rockon:

.470/.470 275° 285° 221° 231° 110° .000 .000

what type tunning gear you got?

moates -all in one - tunerpro - 27sf512 chips,,, everything burns fine and reads fine,,,
I saved the bins from my chips and have been trying to alter them a little at a time,,,
just this thing runs so rich it stalls--- if I could clear that up it would be helpful- thanks

try a search at the top left tunning with a bigger cam and see if something shows.
:innocent:

been searching thru here- and at thirdgen --seems no small steps are gunna help me !!! I'm trying to dial in a 355 with a 305 tbi ,,, it aint going so good !!!
about 10 changes at the track today test and tune--- no good results !!!!! has anyone changed enough with a 305 tbi to make it run good on a 350 ??????? am I wasting my time with this set up ???? should I try to locate a 350 tbi ???? haven't seen any bins for a 350 tbi in a f body yet either !!!!! man this is a rough one !!!!! thanks for any help - steve !!!!

Do you have a wideband?

4.3, 5.0 and 5.7 all share the same throttle bore size. Some may beg to differ but you’re probably good on the air side but if you’re using the 5.0 injectors, you might want to jack up the pressure or go as far as running bbc 80# injectors. I believe ANLU is a 5.7 bin that uses an L98 cam and cop car injectors. Need to work the VE1 and VE2 to get the BLMs dialed in. Your cam is going to idle in the 50 kpa range whereas a stock cam will idle at 30 so your stock tune is gonna feed the engine using the 50 kpa range making it rich. Can you emulate? I would emulate, open a history table most recent and take fuel out of the VE in the cells it idles in. From there datalog and clean up the rest of the VE.

Quote:

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Originally Posted by stew86MCSS396

4.3, 5.0 and 5.7 all share the same throttle bore size. Some may beg to differ but you’re probably good on the air side but if you’re using the 5.0 injectors, you might want to jack up the pressure or go as far as running bbc 80# injectors. I believe ANLU is a 5.7 bin that uses an L98 cam and cop car injectors. Need to work the VE1 and VE2 to get the BLMs dialed in. Your cam is going to idle in the 50 kpa range whereas a stock cam will idle at 30 so your stock tune is gonna feed the engine using the 50 kpa range making it rich. Can you emulate? I would emulate, open a history table most recent and take fuel out of the VE in the cells it idles in. From there datalog and clean up the rest of the VE.

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That cam probably idles in the 60-70 KPA range. Probably not much more than 12-14 in/hg of vacuum compared to the stock 305s 20-22 in/hg. Stock 305 HO cam idled about 50 kpa in the 305 in my old 1983 G20. 10:1 355 with a Hotcam I recently tuned idled at about 60-65 kpa in or out of gear with a 3,000 stall in the TH400.

@ fast355 hey thanx for your insight as I’m still getting my feet wet. One day I get to wear my big boy pants!

thanx for the help everyone,,,

I was using my snap on scanner also to see as much info while it was running---

so no- I don't have a wideband o2 -- but was reading with the scanner---

also I was trying to pull some fuel out at idle--- just didn't get it good enough yet--- idle did seem to have about 14 in/hg of vacuum ,,,

much thanks--- that anlu bin got me close enough for it to run,, its the best starting point I have had yet !!!!

how much do you suggest taking out ???? or is there a percentage to try ????

Try see if this helps... http://www.gearhead-efi.com/Fuel-Inj...-data-Tutorial!

I got it to idle good and revs to 3500 then breaks up -- sometime pops thru the tbi--- I have the base timing set at 8 btdc ,,, could someone please look at this bin and see if something looks out of place to cause this ???? thanks-- steve Attachment 12898

If you’re using the L03 injectors with stock fuel pressure, you’re probably going lean. Do you know which injectors you’re using and what your fuel pressure is?

stock injector-stock pump- will check pressure later today--- this seems to just happen at wide open throttle-- if I open it up easy part throttle it revs right up to 5000

Sound like you are leaning out at top, try and go rich on all the top VE area 20% at a time, if you still lean your maxing out the injector.

thanks for all the help ,,, it does act like that,, lean on top ----
yet the spark concerns me ---
some times it acts like its sparking too advanced,,, sometimes it acts like its wot- popping in the exhaust ????
ive been making too little adjustments-- or too big !!!!--- gotta be a better starting point.... I will try to hook up data logging and see if I can get that working !!!!---

Should've mentioned this before you started to mess with your VE...

Your injector size as stated here: http://www.gearhead-efi.com/Fuel-Inj...ident%2A+color

BPW calculated here:http://www.gearhead-efi.com/Fuel-Inj...BPW-Calculator

Set your BPW accordingly in the scalars...however I have a feeling your 305 injectors will not be up to the task.

cool-thanks,,, I'm going to track down some larger injectors--- and start fresh !!!

just got some 5.7 truck injectors--- the 35206 #s 61 pph -- and gave the regulator a few spins tighter--- about half way down on the adjuster --- has anyone seen any other 5.7 bins besides the anlu ?? thanks-- steve

For your ECM, ANLU is probably the most mild "wild" tune you're gonna get compared to the stock L03/L05. Scroll all the way to the bottom of this page, smallest being L03/L05 cam specs, with the other 3 being LB9/L98 and not sure which one the ANLU uses. Spark tables usually dictated by the heads you're using, with that said what heads are you using. You can copy and paste spark tables from other bins that you know uses the same heads you have. Make sure you're using correct xdf for the bin you're looking at and pay attention to the tables being the same when you cut and paste.

much thanks---I started fresh again,,, with the bigger injectors-----
i've been workin' this bin over like a mad man !!!!
actually have the spark and fuel smoothed out a bit-- seems tons better--- but back to rich at idle---
so I think I'm close !!!--- this engine is a temp engine until my other is rebuilt,,,
its an old school .030 over 350,,,10.5 to 1---forged pistons---
with the good 1969 1.94 iron heads that have had some work ( cant remember the #'s)
had to add accessory mount holes------ z28 springs to match the cam I used,,,,
used the stock tbi intake-- elongated the center mounting holes--- (because my tbi adapter for old school intakes didn't show up-frkkin ebay ))
so its a Frankenstein to say the least--- just has to run for the beginning of drag season--- which is now here !!!!!
looks like rainout this weekend so hopefully I have more time on this !!!!!
rock-on and thanks for all the help !!!!!

Quote:

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Originally Posted by bdads

stock injector-stock pump- will check pressure later today

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My stock pump would only put a few psi more than stock operating pressure when dead headed, so I upgraded to a big block pump. I think the tbi stickies recommend an upgraded pump and fuel pressure gauge to verify, before you even start tuning. Its to keep you from chasing your tail tuning wise.

fuel tables on the anlu bin seemed to be way out of whack--- I smoothed everything,, and leaned out the low rpm ranges---fed it some more around 2500 on up to 5500--- feels good so far,,, now will start trying to log when im at the track--- rock-on !!!