dustin

any long term ill effects on the ecu? (twice the resistance)

and yes, I mean saturated.

Sonny

Why?? Just remove the resistor box and connect each of the 4 output wires to the one input wire. That should work, no? That's like a 10 min job at most.

Sonny

dustin

yeah I'm lazy and I don't want to fool with the wiring.

therealnapster

I dont even think your car will run with saturated injectors and the resistor box. Your injectors will not work right and I think it can damage your ecu, not positive on this but I could have sworn I heard if you do this it will fry out the ecu, could have been with peak'n hold injectors and no resistor box though. Just take out the resistor box.
.ad.

dustin

You're thinking backwards... too much resistance shouldn't really hurt anything... other than perhaps limiting current flow across the injectors... And that's my question... will extra resistance affect injector performance (it won't hurt the ecu)

Dustin

Sonny

Well, according to RC, a peak-and-hold injector system is designed to fire the injector with an initial current of 4 to 6 amps and then fold back to 1-2 amps for the duration of the injection event. The saturated injector is fired with a constant .75 to 1 amp blast of current.

If you assume that doubling the resistance will half the amperage, it looks as if you may still have plenty of current to initially open the injector, but once the amperage folds back, you may not have enough current to keep it open.

It might work...let us know.

Sonny

dustin

Well, that's how peak & hold injectors can work, but all honda ecus drive saturated (read: high impedence injectors).

Some of them (88-91 crx, etc) had resistor boxes that added resistance so that honda could use low impedence injectors in their cars.

Either way, the drivers in honda ecus don't do any "peak & hold"ing as the term was originally intended. Saturated injectors run on much lower current anyways.

I was just wondering if anyone knew whether the extra resistance would, in fact, affect anything.

Dustin

Xerxes

there's only one way to fine out!

-Xerxes

DLB1994

with my accord i got peak&hold on a stock ecu and it works just fine

but accords have a resistor box

b18c1-ek

Dustin,

Did you ever find out whether the resistor box can work with saturated injectors? I am about to swap back to stock injectors to do some testing, and I don't want to fiddle with the wiring more than I need to.

Thanks

TurbodCX

the injectors will work, but the life of the injector is greatly shortened......

b18c1-ek

I'm just going to use the stockers to diagnose my idling problem. I guess what I am wondering is if the car will run. The car will not be driven long-term with the stock injectors in place.

HXMan

I am wiring in some quick connectors with my PH injector wiring so I can go back to stock quickly for emission testing!

Jason kiDD

Well let me explain my setup and the issues I have had with this very same question for the longest. I have a 98 Type S engine that was swapped into my 91 Accord with resistor box using the saturated injectors since last year August. Now the car would run fine, however there were times when the it would just die when just being started, and other strange stuff.

When I asked my shop they said that they had to wire it up that way in order for it to work, however no one I asked ever had any detailed information on the pros or cons of having it setup that way..

I now am about to install the engine into a HB Civic and will probably use the set up DSM injectors that I got along with the AFC so see if there are any real differences. But the car ran %90 of the time with no issues..

I guess I will keep the board posted on my findings later on in the month..

b18c1-ek

I just installed the stock injectors with the resistor box in place... the car fired right up... doesn't seem to have any problems whatsoever......

Full-Race Geoff

I have put high impedance injectors on 2 cars now that used low impedance injectors. Never had a problem

the other guys who say they had a problem, i dont think it was injector impedance related... theres a lot of other stuff involved in a swap like that that could have been wrong

b18c1-ek

Geoff... check PM please

CivicEK.PDX

where do I get info on resistor box for using OBD2 injectors on and OBD1 vehicle? Thanks

dustin

In general, OBD1 and OBD2 injectors are all saturated, so you don't need the a resistor box.

But the OBD level of the ecu on the car does not necessarily correlate to the type of injectos used in the car (i.e. peak & hold prelude injectors)