I have searched and found nothing regarding this...
H22 swap into EG running P13.
Is it not possible to do without the resistor box. The resistance doesnt matter to the ECU. Could you not switch out the low impediance injectors for high impediance RCs like 310s, or even some from a b16b or b18b, and be done with it?
Basically from what I understand is that the reisistor box raises the impediance on the low impediance injectors. It is geting power from main relay. The wires going to the ECU have nothing to do with the impediance of the injectors. just firing order.
Please correct me if I am wrong and let me know your inputs.
Thanks allot.

 

the resistor box is simply resistors that sit inline with the each low imedance resistor to raise teh effective resistance of injector, since the ECU is expecting the high impedence units. If you switched to aftermarket (RC or other) high impedence injectors you would not need the resistor box.

 

What do you mean that the ECU is expecting the high impedence units. could you be clearer about that. From what I understand is that the impediance has nothing to do with the ECU.
All of it sounds good in theory, I just want to make sure I understand all of it correctly.
Thank you.

 

Modified by H22ek4 at 7:43 PM 5/27/2003

 

????????
anybody

 

How about this: Would you go out to your battery and throw a wrench across the two terminals? No, you wouldn't, but WHY? Its because the total resistance of the circuit (a wrench has quite a low ohmic value ) will draw a lot of current.

Same principle applies to the ECU. Low impedance injectors need the extra resistance from the resistor box so that the ECU effectively 'sees' a higher total circuit resistance.

Here is a formula to chew on: I (current) = V (voltage) / R (resistance)

As you can see from this relationship, as resistance goes up, current goes down.

 

yes, the ECU doesn't care what resitance it gets, but it is setup for a specific resistance and so it needs the right injectors (or resistor box with low impedence injectors) to run the engine correctly.

 

think of it this way. a stereo amplifier that is 4 ohm stable....say you put speakers that produce a 1 ohm load on it....that leads to excess heat and either the amp shuts down if it has thermal overlaod circuitry....or it burns out. same thing for your ecu, wrong resistances are not good things...you just need to make sure your injector circuits are the right resistance for the design of the ecu.

 

well i have rc 370 high imped. in my h22 hatch and it runs perfect....

 

nos_b16, What ECU are you running for your 22

 

the ECU has nothing to do with the impediance , its just giving out "NEGATIVE" output for the firing order. the resistor box is inline on the postive side of the injector, where it is link to the main relay and then battery.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by CvexH22 &raquo;</TD></TR><TR><TD CLASS="quote">the ECU has nothing to do with the impediance , its just giving out "NEGATIVE" output for the firing order. the resistor box is inline on the postive side of the injector, where it is link to the main relay and then battery.</TD></TR></TABLE>

This is correct, just a little more to the story.

However, the injectors grounding wires are to the ECU.

The Yel/Blk wires go from the injectors, to a power junction harness which is located near the Brake Master cylinder, then all leads to 1 wire at A25 (with B1 also spliced with it) which is the sensor power wire at the ECU, THEN leads to the battery

Wasn't correcting ya, just adding a little more for information

peace.