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It’s making within 2-3hp peak of what the best 4-barrel carb I tested did (Holley 600) and this is with a 480cfm 2barrel TBI. To be honest, most of you won’t really need this, the base map that comes on the MS2 fired my car up with minimal configuration as I showed in the video above, but I wanted to share this as it may help some of you or inspire a bit of confidence or whatever. Works like a champ ;). The reason for this is this will allow you to start with the base settings that are in the ECU as it ships to you, instead of a completely blank slate, and it will make your job of configuration simpler. For fans of the classic ’55-’87* Toyota Land Cruiser, replacing the troublesome carburetion system with state of the art electronic fuel injection required a custom build that could end with questionable results. In most cases it’s wise to configure your ECU while connected to it and with it powered up. The result is a Plug and play system that will completely replace the factory carburetion system and includes a GM computer “tuned” specifically for this application. As with all Howell EFI systems, the wiring harness is wrapped in weather tight encasement to avoid any weather or heat damage. I first determined where I wanted to place the pump based on easy inlet and outlet as well as mounting considerations, and then I marked the stock hardline to cut a section out of it where I’d be patching the fuel pump in. I tested both 3″ and 4″ tall filters on the dyno and saw no HP difference, though neither would fit under my hood without surgery. Here are a couple of ideas for installing an IAT sensor in a GM TBI system: First option> In the stock GM TBI collar with the stock GM TBI Air cleaner/snorkel. This is the route I ended up choosing. You can see though that at peak WHP it’s a 22.5whp difference in the readings from the old dyno to the new. The air just can’t enter the stock GM throttle body at a right angle like that fast enough to keep up and it severely hinders the flow of the TBI unit without this collar in place. Make your vehicle faster and more powerful with premium-quality performance fuel system parts stocked on our website. Besides that, it’s venting your fuel tank, and that’s a good thing. This is not a complete list of every little bit part you’ll need, but rather what we offer as well as the major TBI components. Support Articles » Technical Articles » Installation Articles » Chevrolet / GM » MegaSquirt Carb to EFI Conversion: One Step at a Time » MegaSquirt Carb to EFI Conversion – Part 1: TBI Fuel Only. Again, if you choose black for one of the wires, it just makes sense to use that on the return side. I then unbolted and removed the factory hardline from the fuel tank leading up towards the engine bay, drained the fuel out of it, cleaned it off/out and cut it where I had it marked. This serves more purpose than just raising the filter up, but it also straightens out the path of the airflow as it enters the throttle body. Designed with big speed fans in mind, this mind-blowing fuel system upgrade will help you maximize engine performance and fuel efficiency. Before you start, on the ‘Fuel Set-up>General’ screen set ECU Type to ‘1’ and click the Burn to ECU button. Multiport should go far to correct this, and I should also mention my heads are a pretty nasty casting with the ports being pretty horribly mismatched to the intake, many of them about 10% blocked due to the poor casting. I had also installed a couple of Innovate TC-4’s in this car for individual cylinder (all 8) EGT monitoring. If you can’t see the throttle readings on one of the front gauges you can select ‘Realtime Display’ from the Tuning menu at the top of the screen. The 12v Switched position for the relay board’s power is run a switched 12v source that’s hot in accessory, crank and run positions of the key. The relay board was wired to the main fuse block’s ground and 12v switched supply. Make your vehicle faster and more powerful with premium-quality performance fuel system parts stocked on their website. Make your vehicle faster and more powerful with premium-quality performance fuel system parts stocked on our website. Idles itself up when cold and down when warm. Again, if you choose black for one of the wires, it just makes sense to use that on the return side. It really doesn’t take that long. Crimp a spade terminal on the center conductor of the shielded wire. Then you can set it directly on top of the TBI without the collar, BUT, you will likely loose some top end power without the collar in there. Note, this was built on a Small Block 350 Chevy motor from a 76 Monte Carlo (swapped into this Nova). The only difference between these two plots is the dyno used to take them and the day they were taken on. Manufactured using the highest grade materials and the... EZ-EFI Self-Tuning Engine Management System by Fast®. Smell for fuel. All kits are now upgraded to a heated O2 sensor to achieve faster closed loop operation. On this 77 Nova we have been running the MS2 Standard Firmware. If you find a problem with a sensor reading you should find the source of the problem, the EMS will need the sensors reading properly in order to properly run your engine…, Junkyard TBI unit from 1992 GMC 2500 Van with 350 Motor, Included injectors, several inches of all attached wiring, and fuel hard lines, TBI Adapter Plate, Summit Racing Part# TRD-2210. I did this by connecting it together with the Main power input to the 70A Relay as can be seen in the above picture of the relay. Skip down to the ‘Setting the General Parameters’ section. Here’s an easy way to add an MAT/IAT sensor to your stock carb-style air cleaner:   (note:  the terms MAT and IAT are used interchangeably, meaning Manifold Air Temp, or Intake Air Temp). First things first. Go to Amazon and search for ‘EFI Tuning’ for example. Inline fuel pumps are easier to install than in-tank fuel pumps because the fuel tank does not have to be removed. Third Option>  So I’ve found I need the collar there. Intake manifolds should be closely matched with your cam and valvetrain to build peak horsepower. Here’s a little video showing how to pass the relay cable through the firewall. Results will be documented. I have had a generous offer from someone to borrow a 900cfm Holley TBI to test. Next I wired up the tach signal to Relay board from the distributor’s ‘TACH’ terminal. Back to the original focus of this section, the IAT. It’s amazing the difference it makes if you pull this puppy out, and it’s a difference most won’t like. We chose a 1977 Chevy Nova with a 350 small block as our subject, but the principles laid out here can be used just the same on a big block Chevy, or a Ford, Dodge small or big block engine, inline engine, a foreign motor…  a motor is a motor is a motor. Shipping is included in the purchase price. Then I installed a second ‘after pump’ 40 Micron fuel filter on the fuel feed line at a factory break in the hard line where there was a worn out rubber line that needed to be replaced anyways (as it wasn’t designed for EFI pressure), just under the passenger side door. You can also see the Injector 12v wire run back to the relay board here. As far as enjoyability and driveability– it’s vastly improved. You can actually crimp these together to a single larger gauge (14-16ga) wire and run that back to one of the ‘Injector 12v’ Terminals on the Relay Board. The following diagram I could have put in many places in this article, but I’ll go ahead and put it here where I’m discussing the first of the wiring that would need to go back to the relay board from the engine (tach signal). Black wire goes to TPS RET terminal on the Relay Board. If you’re not installing a wideband yet, that’s it, you’re done with your power wiring. Inline fuel pumps are easier to install than in-tank fuel pumps because the fuel tank does not have to be removed. Make sure you get the mounting bolts. That’s the dotted lines. Now, you can either get a steel fitting and weld in a nipple, carefully making sure the entire apparatus/lines are fuel free first. The best I was able to do with this GM TBI, which is a 480cfm 2-barrel by the way, was 184.3whp at peak and 311ft/lbs of tq at 2300rpm. There just isn’t a great location in front of the fuel tank and clear of the exhaust that I can see. I connected this to the MegaSquirt and made sure I had enough loose vacuum line in the engine compartment to reach the TBI’s vacuum port I’d be using. So now I’ve got my the TBI bolted up to the manifold, I’ll go ahead and work out my throttle/kickdown linkage before I wire it up. This is what we did to support the additional goodies in this car, the two TC4 EGT amplifiers, the LC-1, and allowing a bit of room to grow. Taking what we’ve got here, a good thing, and showing how, in baby steps, we can make it better. Manufactured using the highest grade materials and the... EFI Single Nozzle Nitrous Systems by Nitrous Express®. $1,053.14. Resist temptation and don’t repurpose this as a return line. We promise not to spam you to death and you can unsubscribe at any time. Best of all, each harness kit is backed by a money back guarantee so you know it’s a quality parts that will deliver years of service. A 60-100 micron stainless filter just outside the tank and before the pump will do a fine job. I DO NOT recommend you drop this file on your car and go any more than I would with the base map. Search for: Search. Here’s a copy of my .msq file, the full configuration of my dyno-tuned map from the above project. Edlebrock Performer Intake. If you’re running a fuel only TBI setup fairly similar to what I’ve outlined in this article and it’s wired up right, you’ve got fuel pressure and the ignition system is still functioning properly (independently of the EMS at this point), then firing the car up should not be a problem at all. Make your vehicle faster and more powerful with premium-quality performance fuel system parts stocked on their website. A bigger TBI though would take that advantage away. Keep in mind heat soak from glaring sun if the car is exposed to the sun. The last option, removing the collar from the TBI and sitting an air cleaner all the way down on the TBI looks fairly carb-like stock, and around town, under 4000rpm will perform very good, but above 4000rpm it’s going to hinder performance significantly. I didn’t see anything obvious so next you can either jumper the fuel pump relay on, or what may be easier than that is to just have someone turn the key on/off several times letting it the pump prime for 2 seconds each time while you check for leaks everywhere. Next, power and ground were wired up to the relay board. MS2 Extra Manual – This is the latest ‘greatest’ firmware on the newest hardware. All rights reserved. This will add cost, we’ll find out if it’s worth it and let you know. So since I didn’t want to go to a raised cowl hood, my final solution was a low profile aftermarket foam filter. Tune it for less. On our 77 Nova I was about 1/2″ short on hood clearance to fit the GM TBI air cleaner sitting on top of this collar. As the air/fuel mixture isn’t as even as I’d like to see I can’t lean it out when cruising where it needs to be to get the mileage, so I’m not seeing a big improvement in gas mileage. Some circuits may be powered in one or the other but not both, you need both. Install and wire in the CLT sensor. If a sensor is completely disconnected it will typically read -40*F. Make sure the throttle opens and closes with your application of the pedal. It’s almost too easy ;). At this point, you can still drive the car around on the carb, but you can connect to your MegaSquirt with the tuning software and see your RPM and manifold pressure. Check out your tank and how much space you have to add a new return line, it doesn’t take much. Easy enough right? I used some of our shielded wiring for this as there will be a ton of high voltage/current induced noise around the distributor and wires and I wanted to avoid that if possible. Back under the hood to finish the fuel system up–   For the fuel feed I used stainless braided 3/8″ fuel line and slipped one end on the factory hardline and the other on the feed hardline on the back of the TBI.

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