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View Full Version : DIY Fuel injector resistor pack for the 3SGTE



Carolina91GT-S
03-28-2009, 05:13 PM
When I got my swap delivered it was missing the Fuel injector resistor pack. Toyota charges $130 for one of these at the dealership so I decided to DIY one these. I searched around and found that the guys over on mr2oc have been doing this for years. Got all of the parts at radioshack or had them laying around.The BGB says to measure the resistors at 4-6 ohms but everyone has been the 8 ohm resistors without trouble. Here are the basics:

~ 8 Ohm 20 watt non inductive resistors, $2.49 each, you'll need 4
~ small project enclosure to house them
~ small project circuit board to hold them in place
~ small terminal block

I installed the resistors on to the circuit board and wired it up exactly like the BGB describes the actual fuel injector resistor pack. Essentially the power wire comes in and gets distributed equally to all the resistors which then travel to their respective injector. I soldered a terminal block to the board using the through holes to give a good connection point for the wiring harness. There are 5 wires total on this resistor pack. I cut off the plug and installed ring lugs so I could attach the wires to the terminal block. Put the whole thing in the project box and installed the box under the MAF. I have been using this in my swap for about a year with no issues. Hopefully this helps someone.

I know this isn't the most detailed writeup but there really isn't anything to this. Here are some pictures for clarity

The box with it all together from the top
http://i176.photobucket.com/albums/w198/Afishianado/DSCN1179.jpg

The underside of the board showing the connections, not the prettiest thing but it works and will hold together in an engine bay.
http://i176.photobucket.com/albums/w198/Afishianado/DSCN1180.jpg

Installed in the car, located just below the entrance to the MAF sensor
http://i176.photobucket.com/albums/w198/Afishianado/DSCN1183.jpg

wiring diagram from the BGB to illustrate how it is wired
http://i176.photobucket.com/albums/w198/Afishianado/3sgtefueinjectorresistorpackcircuit.jpg

Sang
03-28-2009, 05:22 PM
^ Neat-o. You can also use a honda pack as well, they are plentiful in any junkyard.

joe's gt
03-28-2009, 06:03 PM
Nice diy setup. Never seen under your hood before, I absolutely love the painted intake. What did you use to paint the rubber?

Carolina91GT-S
03-28-2009, 06:15 PM
the paint is a spray on rubber paint called "plasti dip" you can get it at lowes or home depot. and if you don't like it, it peels off.

Shadowlife25
03-28-2009, 10:38 PM
Very nice job. :)

Naemion
03-30-2009, 06:39 PM
What does this do for your car performance wise?

Sang
03-30-2009, 07:04 PM
It lets you run Low-impedance injectors on a high impedance driver.

The stock 3SGTE ecu is meant to drive high-impedance injectors, however they use a resistor pack in conjunction with low-impedance injectors instead.

Naemion
03-30-2009, 07:59 PM
Why can't you just take out the resistor pack and put in high-impedance injectors?

Sang
03-30-2009, 08:04 PM
Why can't you just take out the resistor pack and put in high-impedance injectors?

No one said you can't.

Carolina91GT-S
03-30-2009, 08:21 PM
resistors = $11.00
new injectors = $x00.00

Naemion
03-30-2009, 10:50 PM
Oh, lol that would be why most people don't do that then.

Lagos
04-03-2009, 03:10 PM
Nice work. I love DIY projects like this.

ChrisD
04-03-2009, 09:02 PM
:bigthumbu

This has sticky material written all over it. errr I mean....

Good job, great write-up and great way to save some money for those inclined to tackle a DIY solution.