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Thread: New member

  1. #1
    Carb and Points!
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    New member

    Hi, I'm an Italian mechanic owner of a Corvette c4. My car needs a tune-up injection and I found your forum by thirdgen and other sites.
    I hope to find useful information for me and my car or maybe you can help me. Best regards ItalianCorvette

  2. #2
    Super Moderator dave w's Avatar
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    The C4 was produced from 1984 ~ 1996, what year is yours?

    dave w

  3. #3
    Carb and Points!
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    My C4 was produced in the second half of 1986

  4. #4
    Super Moderator dave w's Avatar
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    Quote Originally Posted by ItalianCorvette View Post
    My C4 was produced in the second half of 1986
    So your engine is the L98 5.7 liter TPI engine with the MAF sensor? Knowing which engine will help figure out which tuning software to use.

    dave w

  5. #5
    Carb and Points!
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    Yes, exactly. But one owner before me has made changes to the whole machine. I'd like to tell you everything that I have discovered and studied in this time.
    Can I?

  6. #6
    Super Moderator dave w's Avatar
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    Quote Originally Posted by ItalianCorvette View Post
    Yes, exactly. But one owner before me has made changes to the whole machine. I'd like to tell you everything that I have discovered and studied in this time.
    Can I?

    Yes, please tell us. Pictures of the changes will also help.

    dave w

  7. #7
    Carb and Points!
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    I haven't pictures but I'll make.

    First of all I want to tell you that my english is not good, please forgive mistakes, thanks.

    ENGINE / INJECTION

    Racing exhaust manifold with empty stock catalytic converter and empty stock mufflers,
    No EGR, no AIR, no Canister purge,
    MSD 6AL, Accell HEI supercoil, Accell Cap and rotor,
    Stock wiring harness was replaced with a harness similar to Painless wiring which mounts 1227730 ECM and Speed density ('90 - '92 F-body),
    Walbro gss340 fuel pump, weber fuel pressure regulator, Ford 24Lb fuel injectors (the color is blue),

    TRANSMISSION / DRIVELINE / TIRE

    Stock TH700r4 but the last owner gave me the TransGo performance shift kit,
    Richmond differentials 3.54 ratio,
    255/45 r18 wheels


    Now I ask myself many questions about the reason for all these changes, in particular for the control unit and the wiring.

    What do you think?

    Later I tell you what I thought

  8. #8
    Super Moderator dave w's Avatar
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    Quote Originally Posted by ItalianCorvette View Post
    I haven't pictures but I'll make.

    First of all I want to tell you that my english is not good, please forgive mistakes, thanks.

    ENGINE / INJECTION

    Racing exhaust manifold with empty stock catalytic converter and empty stock mufflers,
    No EGR, no AIR, no Canister purge,
    MSD 6AL, Accell HEI supercoil, Accell Cap and rotor,
    Stock wiring harness was replaced with a harness similar to Painless wiring which mounts 1227730 ECM and Speed density ('90 - '92 F-body),
    Walbro gss340 fuel pump, weber fuel pressure regulator, Ford 24Lb fuel injectors (the color is blue),

    TRANSMISSION / DRIVELINE / TIRE

    Stock TH700r4 but the last owner gave me the TransGo performance shift kit,
    Richmond differentials 3.54 ratio,
    255/45 r18 wheels


    Now I ask myself many questions about the reason for all these changes, in particular for the control unit and the wiring.

    What do you think?

    Later I tell you what I thought
    I like the Speed Density System (MAP Sensor) TPI system. I think the previous owner also liked the TPI Speed Density System. Maybe parts for the Speed Density System is less money and / or easier to find parts for in Italy?

    Maybe the previous owner did not do a good job converting to Speed Density?

    dave w

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