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Thread: 5.7 tbi - larger cam tune advice needed

  1. #1
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    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

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









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    what type tunning gear you got?

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    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

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

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    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 !!!!

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    Do you have a wideband?

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    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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    Quote Originally Posted by stew86MCSS396 View Post
    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.
    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.
    Last edited by Fast355; 1 Week Ago at 08:19 PM.

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

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    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 ,,,

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

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

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    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 anlu-2cd mod.BIN

  15. #15
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    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?

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