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Swapping in a TPI

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by KrebsATM02, Dec 6, 2000.

  1. KrebsATM02

    KrebsATM02 1/2 ton status

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    Ok, i have decided that i want to swap a TPI into the blazer this summer. How hard is the splicing of the wiring harness to make it work right? Anyone have a write up on this? I'm not scared to do anything like this i just want to research and figure out what problems i might encounter. Thanks - Doug

    Doug Krebs
     
  2. KrebsATM02

    KrebsATM02 1/2 ton status

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    Oh yeah, i have an 88 with TBI in it right now with a new 700R4 just to let ya'll know. Later - Doug

    Doug Krebs
     
  3. shum1

    shum1 1/2 ton status

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    You need to talk to blazzinOR on this board. Type in a search for TPI and you will see a bunch of TPI swap stuff.
     
  4. BurbinOR

    BurbinOR 3/4 ton status

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    Doug, it is basically a straightforward project, made even easier by your already having TBI. Still think you should get a Painless Wiring kit, makes it much easier to do, has all the wires labeled and a pretty comprehensive instruction kit. I did not do all the work myself, but can say without a doubt it is easier than most people think. Most of us get intimidated, when it is really a matter of having the hardware and a good wiring kit. I think your existing heads will work with it, but since you have a lot of time before you do it (smart) check on the web with a few of the TPI gurus/TPI swap specialists. A couple that come to mind are http://www.tpis.com and Arizona Speed and Marine (not sure of their URL. There are many others.........http://www.jagsthatrun.com is another.........do a search and the other guys on this board will help you.

    Couple of other key points -

    1. Need a high pressure fuel pump - the one for your existing TBI is not adequate. Probably can just install an IROC or Corvette one (meant for a TPI year) in your rig, either in the tank or up against the frame rails. Summit also sells one (thinking it is around $180.
    2. Computer - get the computer from a newer TPI donor.......one that used Speed Density rather than an earlier MAF unit. Make sure if and when you order the Painless kit that you specify it for a Speed Density unit.
    3. Chip - the above mentioned TPI folks can either burn you a chip or you can do word of mouth searching locally or on the web for a custom chip burner. Should only cost you $100-150 in any case. A good chip burner will ask you what displacement, cam, heads, etc. before he burns a chip. Big point - a stock Hypertech chip is probably OK for a "normal" motor, in my case we upgraded everything from the injectors (19 lb/hr to 24 lb/hr) and throttle body (from 48mm to 52mm) so all this stuff is important to decide up front. If you are going to put a stock TPI on your basically stock 350, fine. Not a problem. Probably will work fine with the stock chip. Mine even did on my original install on an RV cam equipped 400, so you might not need to get too crazy. All depends on your motor and specs.

    You are doing this right, up front info. These can be simple conversions when you know 1 - what you have now and 2 - what hardware you have and the specs on it. Make sure you know what the donor vehicle was.

    Mine went in almost without a hitch - only problem was the VATS was not disabled on the first custom chip - not a big deal. Other than that, it fired right off, changed the knock sensor (was bad) and off it went. Went through emissions like you wouldn't believe - the dude running the sniffer thought his system was screwed up. And this is not a mild motor.

    Sorry for the book, lots more I will probably think of later........in the meantime, get a couple of books. TPI Swappers Guide by John Baechtel is one decent one, there are others that the guys on this board will probably recommend. Keep asking questions, and let me know if you have any more questions............I will as always try to help you out any way I can. It is a great improvement that you will love when it is set up right. And it isn't difficult to get right. Either email me (addy in my profile) or post here. I will respond. You can see the pics of mine at the link below. Just click on the link.



    <font color=black>'79 - 406 TPI -<font color=orange> K5#5 - <font color=blue>See it at---&gt;http://www.blazzinor.coloradok5.com
     

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