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Thread: K1500 4.3 to 7.4 swap

  1. 02-09-2014 #46
    EagleMark
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    Quote Originally Posted by K1500ss4x4 View Post
    The one thing I came upon while browsing sites was the year of the bin files might matter the bin I used was for a 1994 4l60e but I have a 1995 will that make a difference?
    Read man read! Post 6 on first page of this thread!

    http://www.gearhead-efi.com/Fuel-Inj...ll=1#post34977

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  2. 02-09-2014 #47
    K1500ss4x4
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    Quote Originally Posted by EagleMark View Post
    Read man read! Post 6 on first page of this thread!

    http://www.gearhead-efi.com/Fuel-Inj...ll=1#post34977
    OK OK I deserved that! so where can I find a bin file for a 1995 4l60e that I can add my own 7.4 files to?
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  3. 02-09-2014 #48
    EagleMark
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    Read man read!

    Post 21 of this thread you started!

    http://www.gearhead-efi.com/Fuel-Inj...ll=1#post34996

    The change between 94 and 95 is the TCC changed to a PWM version which had much heavier Kevlar IIRC clutches for more slippage and smoother operation and of course programming in the PCM bin file.

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  4. 02-09-2014 #49
    K1500ss4x4
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    Quote Originally Posted by EagleMark View Post
    Read man read!

    Post 21 of this thread you started!

    http://www.gearhead-efi.com/Fuel-Inj...ll=1#post34996


    The change between 94 and 95 is the TCC changed to a PWM version which had much heavier Kevlar IIRC clutches for more slippage and smoother operation and of course programming in the PCM bin file.

    Hey EagleMark

    How do I find out the rear/front ratio of a bin file if it isn't in the description? my truck has 3.73 gear ratios

    After several hours of combing through my current 1994 bin file I came upon this "TCC PWM 1995 Only" and checked the SET box so now I won't need to rewrite my bin to accomodate my 1995 4L60E right?
    Last edited by K1500ss4x4; 02-09-2014 at 08:43 AM.
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  5. 02-09-2014 #50
    EagleMark
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    Gear ratios in descriptions are just notes someone has added in. There's nothing in this particular PCM that has anything to do with axle ratios. I've found very little to no difference in how the tune is changed because of axle ratios... so don't worry...

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  6. 02-10-2014 #51
    K1500ss4x4
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    Quote Originally Posted by EagleMark View Post
    Gear ratios in descriptions are just notes someone has added in. There's nothing in this particular PCM that has anything to do with axle ratios. I've found very little to no difference in how the tune is changed because of axle ratios... so don't worry...
    Cool thanks for that I was worried about using the wrong ratio.

    Well i"ve used the idle tables to really bring down the idle in park I'm at 700 in D I'm at 600 awesome!!

    Now how do I get my Tach in the dash to read the same as the tach in TunerPro? it's about 500 rpm to fast since i switched from v6 to v8.
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  7. 02-10-2014 #52
    EagleMark
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    Quote Originally Posted by K1500ss4x4 View Post
    Now how do I get my Tach in the dash to read the same as the tach in TunerPro? it's about 500 rpm to fast since i switched from v6 to v8.


    The signal to tach comes from wire off coil. So now that it is running correctly I would suspect it to be correct... but maybe there is a differnce in the tach?

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  8. 02-10-2014 #53
    K1500ss4x4
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    Quote Originally Posted by EagleMark View Post


    The signal to tach comes from wire off coil. So now that it is running correctly I would suspect it to be correct... but maybe there is a differnce in the tach?
    Yeah it might be a electro-mechanical thing (like a resistor change) because the tach is definitely still off by at least 500 rpm the redline goes OVER 5000 rpm and the shift points don't seem right unless I'm completely nursing it and when TunerPro says I'm at 600 rpm my tach says more like 1100 rpm
    Last edited by K1500ss4x4; 02-10-2014 at 03:59 AM.
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  9. 02-10-2014 #54
    K1500ss4x4
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    Oh no! another question!!!

    I put in a 180 deg thermostat stock is 195 deg I don't want it running that hot are there any changes I'll need to make in the software to compensate?
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  10. 02-10-2014 #55
    JeepsAndGuns
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    All the aftermarket tachs I have seen have a switch on the back for 4, 6, or 8 cyl engines. They simply count the number of times the coil discharges in a set ammount of time and use that to display rpm.
    Not knowing how the factory chevy tach is set up, I do not know if the curent one could be modded to work, or if it would need swapped out for a V8 one. I'm sure a little google searching could find you the answer.
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  11. 02-10-2014 #56
    brian617
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    Quote Originally Posted by K1500ss4x4 View Post
    Now how do I get my Tach in the dash to read the same as the tach in TunerPro? it's about 500 rpm to fast since i switched from v6 to v8.
    You'll need to change the instrument cluster to one out of a V8 truck.
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  12. 02-10-2014 #57
    Woods
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    Quote Originally Posted by K1500ss4x4 View Post
    Now how do I get my Tach in the dash to read the same as the tach in TunerPro? it's about 500 rpm to fast since i switched from v6 to v8.
    Dakota Digital
    SGI-8 Tachometer Interface
    http://www.dakotadigital.com/index.c...rod/prd127.htm

    Do-it yourself articles, the problem is, different years use different capacitor values.

    http://www.s10forum.com/forum/f62/ho...-heavy-481326/

    http://www.chevytalk.org/fusionbb/pr...php?tid/56905/
    Last edited by Woods; 02-10-2014 at 06:07 PM. Reason: added links
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