11 replies to this topic

[Ninjabread]

So, I bought an acura legend resistor box. Wired it up like this diagram:



But obviously I have 7 wires instead of 4 since I'm using a 2jz pfc.

Anyway, my question is:

That diagram states that you can ground out the 7th (output on the resistor box) wire on the chassis as opposed to connecting it back to the 6 cut injector grounds.

Will this work? If not, gotta pull my harness back out. Rather check before I fry something.

[cianide]

So, the 1jz ecu supplies 12v to the injectors, and the injectors have a constant connection to ground (from the factory)?

That is weird...

[aphxero]

People are retarded. You dont have to ground resistors. They have in/out. And yes the ecu colses them with a ground.

Those black/orange wires are constant 12v supply. The resistor is for current limiting not voltage limiting. I wonder if people know how an injector actually works.

So you have some 7 wire resistor from some honda?

[Ninjabread]

Yea, it's off a v6 legend.

So, fuck, I was pretty sure that the black/orange were the grounds.

I guess I'm gonna have to redo this...

So how exactly should I be hooking it up?!

Just hook all those 12v constants to the red wire, correct?

[Guy Smiley]

Get extra injector plugs. Put proper resistor on 12v side of injector plug and solder that shit on. That will make it painfully obvious and simple. It may be kind of ugly though with how big some of the ceramic resistors are.

think like this.

It's a light bulb. 12v+ on one side, and you touching the other side to a ground source (you are the ECU) when you are supposed to. You touch it to ground every time Mark hits you in the head for following that diagram (calculated timing reference to fire injectors).


I think everyone should read Ugly's electrical theory book before they even connect their battery, because, YES you can fuck that up too.

[bosshogg]

Also be sure the legend's resistor pack puts out the same resistance as the Supra's ???

I'm scared to even use the 7M just incase the duty cycle is affected or delayed by the off-resistance

[Ninjabread]

Drove my car for over 1000km's so far with 0 issues.

Most OEM's are close enough that it's really not a big deal.

The acura resistor did work when wired up correctly, obviously.

[bosshogg]

Killer,

So it was just the power (black/orange) from under the timing cover straight to the resistor pack, and then resistor pack to each injector I assume?

I think the 7m, its 4 wires. One for power and the rest are split up amongst the injector grounding wires? Right?

-Spence

[Ninjabread]

Yea, you cut the black/oranges and hook them up to the 6 black wires on the resistor box, then take the 6 black/orange leads coming from the ECU and hook them all up into the red wire.

This works for me since I'm using a 2jz power FC, which means my injectors all figure individually, as opposed to batched like a stock 1jz (2 are on the same pin). If thats the case, you do the same thing, but you only have to worry about 3 wires since they aren't split.

And no, its not the grounds. You are actually interupting the 12v source. The ECU grounds out the injectors to fire them.

[aphxero]

Think of the resistor like a ball valve with hot water running through it. Doesn't change the temp just the flow. They need the temp, can't take the flow.

Get it? Make any more sense? Thinking about plumbing always helped me visualize current.

And don't touch the fucking wires going to the ecu.

[mcfizzle]

^ Thaaaat.

Using plumbing as a metaphor for electrical systems is how everybody teaches it, autotech programs, MECP training, etc. With a few exceptions, it's a great way to visualize things.

[Guy Smiley]

http://www.google.com/products/catalog?q=u...ed=0CDUQ8wIwAw#


Buy this before you touch anything