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For those wanting to convert to TPI, here's very detailed article

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by BurbinOR, Dec 8, 2001.

  1. BurbinOR

    BurbinOR 3/4 ton status

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    For those wanting to convert to TPI, here\'s very detailed article

    Got this off sethirdgen.org/tpi1.htm

    Here too is a link to the technical articles on the site that have even more TPI info - '79 ONE TON TPI K5 - See it at---&gt;<a target="_blank" href=http://www.blazzinor.rockcrawler.com>www.blazzinor.rockcrawler.com
     
  2. BurbinOR

    BurbinOR 3/4 ton status

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    Re: For those wanting to convert to TPI, here\'s very detailed article

    By the way, that 'TPI shopper's' article is actually off a sister board to thirdgen - '79 ONE TON TPI K5 - See it at---&gt;<a target="_blank" href=http://www.blazzinor.rockcrawler.com>www.blazzinor.rockcrawler.com
     
  3. Nonesuch

    Nonesuch 1/2 ton status

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    Re: For those wanting to convert to TPI, here\'s very detailed article

    thanks BlazzinOR, Hey did you ever get the part number for that Bosche Fuel Pump? All I am lacking for my conversion is: Fuel pump, fuel pressure regulator and fuel line. Hopefully the factory harness I have can be salvaged as well. If not that will be on my list as well and will delay the project for a while as its about 400 bucks to get a new one.
    Justin
     
  4. BurbinOR

    BurbinOR 3/4 ton status

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  5. Nonesuch

    Nonesuch 1/2 ton status

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    Re: For those wanting to convert to TPI, here\'s very detailed article

    yeah the painless kits are cheap but i have the less desirable 85 F-body TPI system which painless doesnt make a harness for. I am checking into upgrading it to an 86-88 system. the links you give have articles on this. I say 86-88 'cause i want to retain the CSI and the 89 didnt provide this option. It looks like just an ECM and harness upgrade. If so I might give it a try. I do plan on doing my own fuel lines. Im still debating on the return line and how to do it. I will probably just do it the easy way and route it into the fuel filler tube. Did you have to put a new fuel sending unit in your tank? I am thinking about trying to find a TBI fuel tank from a Blazer/Jimmy. This is alot bigger of a project than one thinks. I am sure it goes fast though once you have all the research and parts gathered!
    Justin
     
  6. CaptCrunch

    CaptCrunch 1/2 ton status

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    Re: For those wanting to convert to TPI, here\'s very detailed article

    Hey BlazzinOR...

    Just wondering what you did if anything to the lower maniolfd and runners on your swap? Didn't think they would be up to flowing enough for a 406 in stock form. Also what t-body and how big of injectors you using? thanks

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
    <a target="_blank" href=http://coloradok5.com/gallery/captcrunch>http://coloradok5.com/gallery/captcrunch</a>
     
  7. BurbinOR

    BurbinOR 3/4 ton status

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    Re: For those wanting to convert to TPI, here\'s very detailed article

    You know, its funny.........I've heard that from Vette board folks, thirdgen Camaro/Bird folks and even a TPI local guy that knew what I had in my truck (406 ci motor). It has a 52mm throttle body, 24lb/hr injectors and all stock manifold/plenum/runners. Now, the reality of my situation is this - I have never had the motor over 5K rpm's...........recently had it up to 4500 a couple of times, last trip out to Sand Lake, and it pulled extremely strong up there with no apparent 'lack of breath'. The common thinking is that the TPI runners, etc., which was designed for a 305 motor, runs out of breath at the 4500 rpm level on a 350............and I have 56 more cubes than that. So go figure, I suppose if I had the motor in a car and was racing, trying to rev it out, I might have a problem, but I am dead serious when I say I haven't found it hit its' air flow problem with a 4X4 'typical application'.

    Been doing a lot of research (kinda as I call it reverse learning, my version of reverse engineering) on any and all TPI info I can get my hands on, including 3 new books I found, as well as the thirdgen board, and one on one emails with a moderator on that board who is a TPI guru, who is now doing an LT-1 manifold swap (complete with standard TPI distributor hole in that manifold and no Opti Spark) and it seems the $1000 the guys are spending for the 'big mouth manifold, extrude honed or big tube runners, and a ported plenum' are not all that.............and certainly not worth the $1000 they are spending. So I guess I am saying that I don't know why my motor runs so good. I will say this, climbing the dunes in low lock and revving that mouse to 4500+/- I actually was impressed. It is only now running as it should, even tho the motor has run well since the rebuild/upgrade, it had 'issues' to get worked out. We had many PROM chips to try, different fuel curves, and a couple of 'non-code' type drivability concerns to debug - but other than a sticky EGR valve that I need to dig into and change it runs like a raped ape. The torque you feel is incredible and it pulls at low rpm up unlike any small block I have ever felt. My truck has 35" tires, 4.11 gears and a Detroit rear and it can flat out bark the tires launching off the line, on a dry road. My only problem is wheel hop! [​IMG]

    Maybe someday when the lottery figures out I should win that week I will do a full intake system swap...............but I am in NO way unhappy with TPI on my 406. Ecstatic every day in fact............

    <font color=blue>'79 ONE TON TPI K5 - See it at---&gt;<a target="_blank" href=http://www.blazzinor.rockcrawler.com>www.blazzinor.rockcrawler.com</a>
     
  8. Danno

    Danno 1/2 ton status

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    Re: For those wanting to convert to TPI, here\'s very detailed article

    Thirdgen.org does have a lot of info for F-Bodies, but I don't know about their TPI knowledge.

    A lot of the guys in my old car club have done pretty much every kind of mod to a TPI engine (short of a supercharger), and have a good idea of what works and what doesn't.

    Check out http://fox.vet.purdue.edu/phpBB. I'm sure the guys will be happy to answer any questions you have about the article, or TPI/LT1 style fuel injection systems.

    1984 K5 Blazer 4x4 Silverado
    6.2L diesel, 700R4, 3.42 gears, 31x10.5" tires
     
  9. BurbinOR

    BurbinOR 3/4 ton status

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    Re: For those wanting to convert to TPI, here\'s very detailed article

    Thanks for the great link, and information. This is yet another type of knowledge we need to share and use.

    You're right, the true guru's are NOT on the thirdgen board, I keep hoping to stumble across a board of the caliber of CK5 dealing with FI, but haven't yet. Maybe there isn't but I doubt it....................... Maybe I have with your purdue link. I'll check it out.

    Again, thanks. If you see any more info like this, or any TPI stuff, pass it on.


    <font color=blue>'79 ONE TON TPI K5 - See it at---&gt;<a target="_blank" href=http://www.blazzinor.rockcrawler.com>www.blazzinor.rockcrawler.com</a>
     
  10. CaptCrunch

    CaptCrunch 1/2 ton status

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    Re: For those wanting to convert to TPI, here\'s very detailed article

    I'll have to check out the links and see if it is any help. Basically I know the TPI system is great for torque and does well up to 4500 or so rpm. That is fine for a lot of wheeling, but I do hit some mud pits so would like to churn out up to 6000 or so rpm without a problem.

    I believe the stock or maybe a small upgraded Tbody would be fine and the upper intake should handle my needs, but I think the runners are gonna be my main hassle. The lower manifold I really don't have much of an option on that. The runners themselves kind of seem to be the key to the whole motor. I wouldn't mind a swap to the larger runners even though it would cost me some torque but the cost is pretty harsh at a shade under 5 bills. Anyone had anyluck porting out the runners a bit? It seems like at least getting the flash out and cleaning up any minor imprefections would yeild a pretty decent benifit at higher rpm.

    I know a couple guys who have battled with tpi and have heard various opinions and ideas. Most guys I have been saying just save the money and get an intake manifold drilled and tapped for injectors, then either run a open bolt on type 4bbl throttle body or an elbow setup with a tpi style throttle body.

    I'm still kinda surprised you only have 24 lb injectors. Figured for about 300 hp you would need 28's but suppose it really depends on rpm and what duty cycle the injectors are programed at

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
    <a target="_blank" href=http://coloradok5.com/gallery/captcrunch>http://coloradok5.com/gallery/captcrunch</a>
     
  11. FastEddy

    FastEddy 1/2 ton status

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    Re: For those wanting to convert to TPI, here\'s very detailed article

    Nonesuch.....If you are looking for a Blazer TBI tank with the pump/sender etc I have one here the tank is new....complete with sender/pump and wiring harness with the factory plug....I am not sure about any shipping issues of a fuel tank though so that may be a problem....just thought I would let you know...ED
     
  12. CaptCrunch

    CaptCrunch 1/2 ton status

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    Re: For those wanting to convert to TPI, here\'s very detailed article

    FastEddy... did you ever get a chance to look into that 14B sf? thanks

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
    <a target="_blank" href=http://coloradok5.com/gallery/captcrunch>http://coloradok5.com/gallery/captcrunch</a>
     
  13. Danno

    Danno 1/2 ton status

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    Re: For those wanting to convert to TPI, here\'s very detailed article

    Read that PDF I linked to before deciding anything on your runners!

    1984 K5 Blazer 4x4 Silverado
    6.2L diesel, 700R4, 3.42 gears, 31x10.5" tires
     
  14. HarryH3

    HarryH3 1 ton status Author

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    Re: For those wanting to convert to TPI, here\'s very detailed article

    Capt. you can't port the stock runners. They're made from a VERY thin walled tube. Nothing there to hog out. I did open up the intake base on mine just a bit when it was apart. Using carbide burrs and sanding rolls I managed to slightly enlarge the holes and smoothed them up considerably. I also hogged out the upper plenum according to the directions in the TPIS book "TPI Secrets".

    Then I bought the Accel/Lingenfelter runners, which were VERY disappointing. The instructions mentioned something about the "precision fit and high quality". Took me most of a day to make the damn things fit! Had to keep grinding away bit and pieces that hit various other parts of the system, fuel rails, brackets, etc. I also port matched everything. The runners had ports that were more than 1/8 inch off center. Took a LOT of work with the carbide burrs to get it all straightened up!

    The engine is very strong (it's a 383 with ported '87 'vette heads and TPI). But it's a mother to work on. Nearly any work you do on top of the engine requires taking the upper plenum and runners off so you can get to anything else. GM definitely didn't think about being able to make repairs when they designed that jungle gym of tubes. [​IMG]

    <font color=black>HarryH3 - '75 K5</font color=black>
    <a target="_blank" href=http://www.angelfire.com/super/ThunderTruck>www.angelfire.com/super/ThunderTruck</a>
    It's a great day to be alive...
     
  15. BurbinOR

    BurbinOR 3/4 ton status

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    Re: For those wanting to convert to TPI, here\'s very detailed article

    Well as for the 24 lb injectors, I am not sure what the max HP they will support, but again we built this motor for torque, not to dyno at 6K rpm.

    Your idea of a custom intake drilled for injectors is a good one by the way - if you are interested in HP - one of my builder's Jaguars (has 3, 2 of them TPI, and one a race hybrid motor) has a Victor Jr. manifold drilled as you suggest, with a 1000 cfm throttle body sitting on top............running 13-1 compression. Unbelievable power. Not sure what lb/hr injectors he has on that but it is on a 434 ci motor..........and scared the whee out of me on the joy ride he gave me.

    What a lot of the guys are doing is 'extrude honing' their runners...........don't ask me what it is since I don't know! But as HarryH3 said, there isn't a lot of meat to remove. Some other options are the siamesed runners, etc. But keep reading and make your own conclusions, seems a lot of $$ can be burned through quickly for not much gains. Still and all I wouldn't trade this setup for anything, for most 4X purposes this low end stump pulling torque is the preference.

    <font color=blue>'79 ONE TON TPI K5 - See it at---&gt;<a target="_blank" href=http://www.blazzinor.rockcrawler.com>www.blazzinor.rockcrawler.com</a>
     
  16. CaptCrunch

    CaptCrunch 1/2 ton status

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    Re: For those wanting to convert to TPI, here\'s very detailed article

    Everything Dano's article says is about what I have heard, but it kinda leaves people without big bucks out to dry... Basicall says get an LT1 or buy a $900 intake system [​IMG] I'm classic for telling guys you gotta pay to play, but basically no way my daily driver is worth that much coin LOL. Now my drag car... that would be pocket change LOL.

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
    <a target="_blank" href=http://coloradok5.com/gallery/captcrunch>http://coloradok5.com/gallery/captcrunch</a>
     
  17. CaptCrunch

    CaptCrunch 1/2 ton status

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    Re: For those wanting to convert to TPI, here\'s very detailed article

    I kinda figure that. I have heard about working the upper out a bit and it works well enough. Overall I kinda wonder exactly what kind of power the stock tpi components would be held to? I wouldn't have any fear of running a small 75 shot of nitrous for the pits if after the buildup was done if it didn't fullfill the expectations.

    What setup do you have for an intake HarryH3? Stock lower and upper w/ the accel runners? What size t-body? You still using the stock GM ecm?

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
    <a target="_blank" href=http://coloradok5.com/gallery/captcrunch>http://coloradok5.com/gallery/captcrunch</a>
     
  18. HarryH3

    HarryH3 1 ton status Author

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    Re: For those wanting to convert to TPI, here\'s very detailed article

    I don't know if GM changed the runners in later years, but the '87 tubes were thin enough to bend just by whacking them with a wrench. I don't see how you could enlarge them at all. Perhaps you could flare them a bit right at the ends, but I don't see how that would help.

    I have the stock intake and throttle body with the Accel runners. Did a lot of massaging to the upper plenum and the manifold base. Injectors were upgraded to 26 or 28 lb/hr (it's been 10 years since I built it, so the brain's getting a bit foggy) [​IMG]. The cam is pretty hot, but I figured that I'd have plenty of low end torque, even if the cam did give up a little down there. [​IMG] It uses the Mass Air Flow sensor, so the stock ECM works pretty good with the setup. The MAF "sees" the extra air coming by and squirts the right amount of fuel.

    The guys at <a target="_blank" href=http://www.tpis.com>www.tpis.com</a> sell a book that has lots of "do it yourself" tips on working over the plenum and base. Myron at TPIS was dyno testing, flow bench testing and drag racing TPI engines and figuring out how to make them run better from about the day they first hit the streets. [​IMG]

    <font color=black>HarryH3 - '75 K5</font color=black>
    <a target="_blank" href=http://www.angelfire.com/super/ThunderTruck>www.angelfire.com/super/ThunderTruck</a>
    It's a great day to be alive...
     
  19. CaptCrunch

    CaptCrunch 1/2 ton status

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    Re: For those wanting to convert to TPI, here\'s very detailed article

    Oh yeah I know how all sorts of cash can be shelled out for not much gains... that is why I was looking to keep a stock tpi setup if I go that route. otherwise doing the manifold tap and throttle body wouldn't be bad... I also know the ext. honing and that is expensive as well. Overall I'd probably go like at the end of the article danno posted and go supercahrged if I really wanted top notch. I would really dig a supercharged K5 [​IMG] Thanks for the info BlazzinOR.

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
    <a target="_blank" href=http://coloradok5.com/gallery/captcrunch>http://coloradok5.com/gallery/captcrunch</a>
     
  20. HarryH3

    HarryH3 1 ton status Author

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    Re: For those wanting to convert to TPI, here\'s very detailed article

    I'd supercharge everything I own, if the prices were reasonable. [​IMG] I just don't see how a supercharger should cost as much as a complete, performance small block. [​IMG] The difference that forced induction makes at high altitude is just incredible! [​IMG] But I can't justify forking over $3,000+ for a supercharger.

    <font color=black>HarryH3 - '75 K5</font color=black>
    <a target="_blank" href=http://www.angelfire.com/super/ThunderTruck>www.angelfire.com/super/ThunderTruck</a>
    It's a great day to be alive...
     

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