TPI is a fuel injection system that uses individual injectors for each cylinder that are mounted in the intake manifold and usually ends up looking much different than a traditional carbureted setup. If it goes well on the first one, I'll likely try to replicate the swap onto my Buick Electra and possibly even my Buick Special. If you know something about wiring and basic EFI bits or can read up and learnthen this is something any person could replicate.

Basically, I am trading my time to think about things and learn how stuff works for the money I could pay someone else to do that work for me. I like to learn about stuff, and I'm always short on cash, so this is a good set of trade-offs for me. If you have more money than common sense, the thought of building your own wiring harness scares the hell out of you, or you don't want to invest the time or energy into thinking about this too much, then go pay someone else for the right parts.

A secondary goal is to avoid cutting and hacking at the vehicle to actually do the swap - particularly in the case of my Buick Electrawhere being able to return the vehicle to "factory stock" for a later restoration help retain the car's value.

This means no cutting or changing of the gas tank or the firewall. This pretty much dictates a weatherproof computer that can be mounted in the engine compartment.

Official Factory Repair Information

As part of an aggressive focus on low-cost, I am attempting to build my own harness out of factory bits. If you do not want to go that route, various sources for custom "EFI swap" harnesses are available, go Google for them. I prefer to wire things myself and want to be able to take a pile of wire stubs and connectors and turn them into a wiring harness for just the cost of the wire and some new terminals to go into the connectors.

This page is focused on the "hardware" for this swap - the computer, sensors, actuators, solenoids, pumps, relays, and the wiring harness to tie it all together. It is not meant to address how to tune the resulting TPI system after you create it. That topic already fills many books and many websites, and is far too much to cover here. TBI mounts much like a carburetor, and can be added using an adaptor plate, so it's simpler to mount.

They both use the same basic sensors, though the computer used to drive each one is a bit different. TPI does allow for finer fuel control in more advanced systems, though TBI does a pretty darned good job on a stock or reasonably-close-to-stock engine.

I prefer TPI for the potential added control, though I fully admit than in my circumstances that may be more of a "looks cooler to me" type of decision and your thoughts may vary. But, since this is my page and my cars, my opinion counts for a lot no matter how biased it may be. In my case, I have chosen a TPI system that uses a computer that is weatherproof and is placed in the engine compartment - see the next section for more details on that.

On an older vehicle where you want to avoid cutting holes in the firewall, this is a very big deal, and to me, this helps make it worth it for the added hassle that TPI brings. Also, mounting a TPI system onto an engine that was never offered with TPI means you have to make up some custom hardware to get it to work. Getting the fuel rails fabricated, the intake manifold modified to accept the fuel rails, and getting a throttle body mounted to the intake manifold are all difficult tasks.

I say "difficult" not because these are insurmountable goals, rather that they are hard for the average DIY-er to do in their garage. That translates into having to spent money to pay someone else to do the work for you, which is at odds with the need to make this as DIY and low-cost as possible.

tpi wiring harness diagram

Welcome to the world of tradeoffs. The good news is that once you get the basic hardware in place, upgrades to larger injectors, sequential injection and other higher-end goodies are as "simple" as swapping out the wiring harness and computer.

And yes, I do realize that using the term "simple" for that will strike many folks as very odd. Remember, wiring doesn't scare me and is something I can do easily.

TPI Engine Swap for Classic Chevy's - Retro-Jection

Machining parts is something I find a lot harder to do. The computer I chose is computer part This computer is electrically identical to one of the most popular GM TPI computers - computer part except that this one is in a weather-proof housing that can be mounted under-hood. The computer was used in both V6 and V8 models - most notably in the Corvette for and This harness takes care of the headaches involved with installing Tuned port injection on most all SBC engines or swapping a TPI engine into your vehicle, and makes for a much easier installation.

Our harnesses are all made with top of the line copper strand wire. Each harness comes complete with the necessary relays and its own fused power source. Each harness comes complete with detailed installation instructions and full technical support by phone or online. Harness comes completely loomed with automotive grade split loom.

1989 Trans Am Wiring Diagram

We use all GM grade connectors. Installation consists of simply laying out the harness on the motor, plugging in the various devices. Each harness has 3 feet of reach from the rear of the engine to the ecm, with an overall length of 5 feet. We have also supplied the correct rubber grommet to install the computer inside the car. Our harnesses remove all the provisions for the unwanted items that modern FI engines come with. This harness is perfect for dropping any TPI engine into any vehicle.

Harness must be used with ecm speed density computer and the correct prom chip with VATS removed. Connections on the engine side.

GM TPI Products

If you would like faster service please call us and place your order. Please see our shipping policy before ordering. Do You need remote coil wiring? See it here. Larrys Electric. Home Shipping policy. Product Policy. Contact Us. Special orders.

Shop Home. Categories Fuel Injection Harnesses. Chassis Harness. Vintage air Products. Universal fan controllers. Tuned Port Intake, and Accessories. Replacement Connectors. Pig Tails and Adaptors. Universal Fuse boxes. View Cart. View Your Cart There are no items in your cart. Universal Tuned Port Injection harness. Choose One R4 No trans provisions.First you need to go to junk yard and pull the engine EFI harness or complete system if you can. There will be a lot of extra things, don't worry about them now grab it all as whole as you can.

Couple things under dashboard are going to be near impossible and get all of, one is wire to VSS sensor if it is in the speedometer. Another is wiring to ALDL port, grab as much as you can and cut, we'll get it all connected later. One wire goes all the way to fuyel tank for EFI fuel pump grab as much as you want. Pin by pin on the harness is listed below but you should really have a set of diagrams.

Lay the harness out on your work bench and have each sensor plugged into the harness, then trace each wire back to the ECM connector, you will be able to separate a lot of uneeded wires, consult wiring diagrams.

Once you have each wire identified and layed out, then you can set it up on the engine and start tailoring it to fit your engine. Placement of the sensors will determine wire length. Most stock harnesses are plenty long and only need to be shortened or wrapped and bundled. Use good wiring practices here, crimp connectors are just going to fail someday, solder or use connector without plastic cover and slightly crimp to hold wire in place but then solder.

Solder and shrink wrap are permanent. Basics to Conversion wiring: I run 2 relays. I use the basic 30 amp aux lighting relays from the parts store.

If the harness came with the factory fuel pump relay than I retain that relay. If not I use the 2nd 30 amp relay for the fuel pump. Since it is only used to turn the relays on there is less draw on the stock 30 year old scout wiring.

I don't run the ign from the switch. Due to voltage drop from the old IH wiring. I run all switched from the key "on" position 12vdc thru the relay. If you use a bosch style relay here are the pins: There are several different versions of the relay out there so look at the pin numbers before you buy one. Using factory relays like fuel pump relays are cheap and easy Did you print them yet?

Pin C is the ground wire. Pin D is your 12V from a fuse. This is normally tied to the org wires B1 and C It is the same that provides the bat 12V to the ECM.My Home. Description Item Number. Email Ron. Can we make a harness for you? The M.

However, newer modified engines can be wired this way also using this sensor with the engine computer. Using the engine, the computer, prom, and knock sensor will have to be changed to components. This system uses a M. You benefit from an easier installation by not having to install the mass air flow sensor which is encased in a big, hard to route, air intake tube.

All necessary computer controlled sensors are utilized as in the original vehicle. The transmission types available were R4, 4L60 and the manual transmissions behind the engine. You can also use the turbo and transmissions. The ECM requires a four thousand pulse per mile speed input. Our harness upgrades the through engines by running them on the Camaro or Firebird computer. TP Chevy 3. This kit allows the radiator cooling fan to be controlled through a relay and to be turned on and off by the GM computer.

The engine idle will also compensate for the load of the air conditioning compressor. Order Status.Wiring Diagram. Collection of tpi tech gauges wiring diagram. A wiring diagram is a simplified conventional pictorial depiction of an electric circuit. It shows the elements of the circuit as streamlined shapes, and also the power and also signal links between the devices. A wiring diagram normally provides info concerning the loved one setting as well as plan of tools as well as terminals on the gadgets, to help in structure or servicing the device.

A photographic representation would reveal extra information of the physical look, whereas a wiring diagram makes use of a more symbolic notation to highlight interconnections over physical appearance. A wiring diagram is usually made use of to fix troubles and also to earn certain that all the links have actually been made which whatever exists.

Variety of tpi tech gauges wiring diagram. Click on the image to enlarge, and then save it to your computer by right clicking on the image.

A first look at a circuit layout could be confusing, but if you can review a train map, you could read schematics. The purpose is the very same: getting from point A to point B. Literally, a circuit is the course that enables power to circulation. Voltage: Gauged in volts Vvoltage is the pressure or force of electricity.

This is normally supplied by a battery such as a 9V battery or mains power, the electrical outlets in your house run at V. Electrical outlets in other countries operate at a various voltage, which is why you require a converter when taking a trip.

Present: Current is the circulation of electrical power, or more particularly, the flow of electrons. It is determined in Amperes Ampsas well as could only move when a voltage supply is attached.

Resistance: Determined in Ohms R or Oresistance defines exactly how quickly electrons could stream with a product. Products such as gold or copper, are called conductors, as they easily enable flow of motion reduced resistance. Plastic, timber, and also air are instances of insulators, preventing the activity of electrons high resistance.

DC Direct Present. DC is a continuous circulation of current in one direction. DC could stream not simply through conductors, but semi-conductors, insulators, as well as a vacuum. Air Conditioner Alternating Present. In Air Conditioning, the circulation of current regularly alternates in between 2 instructions, often forming a sine wave. The frequency of AC is measured in Hertz Hzas well as is normally 60 Hz for electricity in household as well as service objectives. Completing an electric design level and also then obtaining a work in the area means you will certainly see a great deal a great deal a great deal of these schematics.

It s vital to understand precisely just what is going on with these.See all 16 photos. I remember sitting in auto shop listening to Mr. Curtis explain the virtues of fuel injection, circa early '80s. Even then, the term was far from new, and yet fuel injection was all but unobtainable on American V-8s.

There were the mechanical systems of the late '50s and '60s, and Chevrolet was pitching its new Cross-Fire Injection later known as Cease-Fire Injection.

tpi wiring harness diagram

But if you wanted electronically controlled port fuel injection for your V-8, you were pretty much SOL. Curtis was sold on the efficiency and accuracy that EFI promised and sang its praises in detail, going so far as to tell us how he wished he could get a "true" fuel-injection setup for his Corvette, a model with a computer-assisted Quadrajet.

Sure enough, before I was even out of high school, Tuned Port Injection TPI was a reality-and it was like nothing we'd seen: wild runners, front-mounted air inlet, and individual fuel injectors. The Tuned Port Camaros and Corvettes were some of the fastest factory muscle machines the public had seen in quite a while.

The down side was that most people were scared to death of the eight-legged monster straddling that most familiar V How the heck do you tune it? What if it stops working? Where's the choke? The years since the introduction of TPI in have proven the reliability of the system and have provided the opportunity for the general automotive public to get acquainted with it.

Naturally, now that we know that TPI is as trick in function as it is to look at, we, like Mr. Curtis, want it for our classic muscle machines. Don't feel intim-idated; it's not as complicated as you may think. In fact, with the assistance of the aftermarket, it's pretty straightforward. Things to Consider The simplest way to merge TPI with your classic Chevy is to use the engine, harness, and computer from a donor car. Then it's a matter of bolting in the motor, routing the harness, and dealing with any conflicts that may arise with belt-driven accessories, exhaust plumbing, air-cleaner configurations, and so on, but the most labor-intensive work involves plumbing the fuel system.

This approach is certainly easier than merging TPI with your carbureted engine. But since most of us don't want to spend the money for another motor if the one we already have is good, combining the two is inevitable. Your next decision is the source of the TPI componentry. You could piece a system together by scrounging the swap meets, but we advise against it.You should know that live streaming may be geographically restricted and you must have money in your account, or have a bet dating from the preceding 24 hours.

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tpi wiring harness diagram

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tpi wiring harness diagram

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GM Corvette and F-Body Tuned Port Injection Vacuum Circuit Explained

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