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Thread: Need a decent tune to get me started 1995 chevy silverado k1500 manual trans

  1. #1
    Electronic Ignition!
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    Need a decent tune to get me started 1995 chevy silverado k1500 manual trans

    I have a 1995 chevy silverado k1500 with manual transmission I pulled the stock junk 350 out built a 355 with a 3970010 block flat top pistons edelbrock aluminum performer rpm heads comp cam .447 int .462 exhaust lift aluminum edelbrock rpm air gap intake bored out tbi from cfm tech tbi spacer stock injectors have higher flowing fuel pump after market fuel pressure regulater spring running around 20 psi fuel pressure I'm using an after market tune I paid for before I rebuilt engine it idles decent I can't tell it's running super rich.... when under a load or when stomping accelerator it fires back through intake or sputters bad.... I set base timing at 0 degrees and made sure it matched with the data dash with timing advance wire disconnected.... re connected and everything seemed to be matching up... so to try to pin point problem I disconnected timing advance wire advanced base timing to about 25 degrees left the timing advance wire disconnected and the problem went away... that being said truck had more bottom end power didn't sputter but could still tell it disn't have the power it should... I've been studying and playing with the tune and have gotten no where... if anyone could send me a tune that could get me closer to where I need to be I would greatly appreciate it..... my e mail is drslayer7mm@gmail.com incase I don't get a notification thanks for any help

  2. #2
    Super Moderator dave w's Avatar
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    I'm thinking a Wide Band O2 (WBO2) tune would be a good option for an engine like you have.

    If you want to know more about WBO2 tuning, here is a thread I started: http://www.gearhead-efi.com/Fuel-Inj...29-Spreadsheet

    dave w

  3. #3
    Electronic Ignition!
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    Yeah I have standard o2.... looked for a wide band but haven't found any wide band o2 for my truck.....

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    Super Moderator dave w's Avatar
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    WBO2's are not factory parts. It would be nice if the factory used WBO2 for your vehicle.

    A WBO2 is a measurement instrument that is added to the exhaust system for the sole purpose of tuning a modified engine like yours.

    dave w

  5. #5
    Electronic Ignition!
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    So your saying one of the wbo2 with the lead and afr gauge

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    Super Moderator dave w's Avatar
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    Quote Originally Posted by drslayer7mm@gmail.com View Post
    So your saying one of the wbo2 with the lead and afr gauge
    I use the AEM 30-4110 for WBO2 tuning: http://www.aemelectronics.com/produc...uego-afr-gauge

    dave w

  7. #7
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    Wish I could find a close tune that would run it pretty decent until I have the extra cash to get the afr gauge...

  8. #8
    Electronic Ignition!
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    There are tons of tunes on here but I have no clue how to tell what tune is for what...

  9. #9
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    I've decided I'm probably just gonna put an hei distributor in it and drop a carb on it... this tuning just isn't working out for me...

  10. #10
    Quote Originally Posted by drslayer7mm@gmail.com View Post
    Wish I could find a close tune that would run it pretty decent until I have the extra cash to get the afr gauge...
    No self respective tuner will want their name associated with "good enough for now". That's usually how cylinders get washed or holes get burned. Yeah, you could use it as a start tune to start tuning but that's about it. You have a very specific set of mods that will command a tune specific to them.

    You could use fuel trims to create a safe moderated load tune to be able to drive around. Then once you can get a wideband, tune WOT, enrichment..... Majority of the data can be made safe with a narrow band and proper logging.

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