Welcome to EFI Connection - Latest News

Drive-by-Wire for TPI and LT1 Engines
No more cables! - Updated 4/17/09

The first of its kind! EFI Connection now offers electronic throttle bodies for the TPI and LT1 type intake manifolds. The use of one of our electronic throttle bodies requires the LS1 PCM and Corvette Throttle Actuator Control module. And to use the LS1 PCM with Corvette calibration, you must equip the the engine to use 24x crank and 1x cam signals. We designed and developed a 24x system for equipping early Small-Block Chevy engines and LT1/LT4 engines with the necessary signals required by the LS1 PCM. Electronic throttle on your TPI or LT1 type intake manifold means no throttle or cruise control cables in the engine bay, integrated cruise control with 3 wire hook up, a responsive cruise control system (no more vacuum lag), and even a smoother idle for engines with aggressive camshafts! Throttle body prices start at $500.00 plus an LS1/LS6 Corvette throttle body core or core charge. We would like to talk with you before ordering. Please email or call us at 814-566-0946 to discuss your project.

Click on image for a larger view...

Why Should the LS1 Have All the Fun?
We illustrate the core components of our 24x LT1/LT4 System - Updated 2/26/09

In mid 2008 we set out to bring the LS1 PCM to the LT1 and LT4 engines. The LT1 has been overlooked by many engine swappers due to the ever popular Optispark ignition problems. We decided that the Optispark had to go and be replaced with an LS1 coil per cylinder system. To accomplish the task, we have developed and are now offering a 24x crankshaft reluctor and a 1x camshaft reluctor to satisify the LS1 PCM's required signals from the engine. The crank and cam reluctors install within the 96-97 LT1 timing cover and the cam sensor housing is installed in place of the Optispark distributor. The sensors are all serviceable through your local GM parts department and the components specific to EFI Connection will never wear out. Installation requires the LS1 PCM, new plug-and-play 24x LT1 engine harness or rework of the original LT1 engine harness using our DIY harness components. Anyone who can tune an LS1 PCM can now tune the LT1/LT4 engines using their preferred LS1 PCM calibration software. LS1 PCM control, RoadRunner real-time tuning with EFILive, forced induction support, nitrous control, 4L60E/4L80E transmissions, electronic drive-by-wire throttle, and more are now possible on any LT1 or LT4 engine! Read more, see one of our test vehicles, watch a video, or call us at 814-566-0946 for more details.

Click on image for a larger view...

About EFI Connection

EFI Connection offers replacement GM harness connector pigtails, benchtop programming harnesses for many GM engine and transmission controllers, and other fuel injection related parts. Please contact us with any questions you may have about our work or to discuss your custom project.

Unassembled Connector Pigtails

We assemble all of the connector pigtails we offer, so we do stock all connectors, terminals, cable seals, etc. While we are willing to offer these connector pigtails unassembled, it is very important that you understand there is a specific crimp tool or die for each terminal. A generic crimp tool will not provide a quality crimp. We do offer several crimp tools for these terminals. Buyers of unassembled pigtails will assume their own risk in crimping terminals to their wire harness. Please contact us to discuss ordering unassembled connector pigtails. We will provide a quote and availability.

International Orders

We frequently ship internationally! At this time our paypal shopping cart does not allow for international shipping rates, so if we can not get your package to your address with the shipping calculated by paypal's shopping cart, we will send an additional paypal payment request for the remaining shipping costs. While most items are shipped First Class International Mail, we prefer to ship internationally using USPS Express Mail International. This service provides quick delivery and tracking information, First Class International Mail does not.

Large Quantities

Do you have a need for a large quantity of something on our website or some other GM related connector pigtail or extension harness? Please contact us to discuss such an order. We will provide a quote and estimated time to build.

Payment and Shipping

Custom wiring harnesses will be invoiced by email. All other items on this website may be purchased through the PayPal shopping cart by clicking the "Add to Cart" buttons. In most cases, all items are shipped the following business day using First Class USPS mail. When items are shipped First Class mail, you will receive a delivery confirmation number by email. USPS calls this a tracking number, but it is actually only a delivery confirmation number and will only show online status when your package is delivered.

Frequently Asked Questions

I'm looking for a replacement connector pigtail for a [non-GM vehicle]...
We do not offer replacement connectors for Ford, Lexus, Jaguar, Chrysler, Honda, or any other non-GM vehicle. Please see your local dealership or your local auto wrecking yard for non-GM connectors.

I'm looking for a GM replacement connector pigtail that I do not see on this website...
We stock many different replacement connectors for GM applications. Please contact us with any special requests.