my resistor setup also works fine. i have driven it for 6 hrs straight without a problem.

 

what is your setup?

edit i just re-read the whole thread - you're essentially running the same as the rest of us. 2 100/10W in parallel for good heat dissipation.
didn't find anyone in this thread that has a 10 or 12K working.

 

SOB the 2x 50ohm 10W resitors works for the CEL fix but damn it gets hot! Is it even safe to keep in the car?I wanna tuck it under the carpet under the passenger seat, but I don't need a fried evo!

 

you can always try and use just one of the 50s... it will make less heat than 2.

 

Or add another 50 ohm resistor in series with the 2 you already have installed and it will have 1/3 of the total heat, now that we know the ECU will allow up to an 80 ohm load without tripping the CEL (thanks to MrFred ).

I have been running the dual resistors at a 25 ohm load in a metal project box which I keep in my glove box and it gets very warm, even with vented holes. I will be adding another 50 ohm resistor is series this weekend to create a 75 ohm load. This should be cool enough to keep in a plastic project box without radiating much heat. The 2 resistors in parallel would only dissipate less than 0.5 watt each and the 50 ohm resistor you'd be adding in series would only dissipate around 2.7 watts. This is compared to your resistors now which are dissipating around 4.1 watts EACH.

 

well, i think i failed to make myself clear in the original post...

with periphery0 = 56D8 my ecu keeps throwing p0125 error code under same circumstances as cat efficiency error. i guess that's specific to EUDM version, cause i have never seen this behavior in the US models.

my guess is that periphery bits have different effects in different market ecus, so it can't be completely disabled with periphery value on EUDM... and probably there should be some sort of subroutine patch to address the issue. can anyone advice if tephra rom fixes the problem, please?

 

For all who are interested. I found a single 5 watt 75 ohm resistor, +/-5% tolerance for $0.70 HERE. I just ordered one myself and the shipping costs are usually nothing at all so I'd expect for it to be less than $2.00 shipped.

 

I guess I dont get the corrlstion between heat and number of resistors and total resistance. Will this 75 ohm one be less hot than the 2x 50o/10w setup?

 

in general, power is directly correlated to heat, so its a good assumption that the more power, the more heat.

Ohms Law: E=IR --> I = E/R
Watts Law: P=IE --> P=EE/R (P is inversely proportional to R)

The larger R is the smaller P is, so -

R = 50 || 50 = 25 Ohms

vs

R = 75 Ohms

clearly the 75 will generate less heat.

but! that doesn't account for heat sinking and power capability.

the 75 is only rated for 5W. whereas the 50s are 10W a piece.
Total power is much less for the single 75 then it is for 50||50 so i'm gonna go ahead and say yes the 75 should be cooler, especially if the 2 50s are right on top of each other, or wrapped together.

is a 75/5W cooler then a single 50/10W ? theoretically the 50 should generate more heat, but i honestly couldn't tell you because the 75 is at 52% of its limit. you'll need to wire both up to a power supply and use a heat gun to get a definitive answer.

I can tell you however that the 50 should last longer than the 75, but practically it shouldn't matter. the 75 is probably the best answer.

 

I have the answer to all your resistor heat problems http://www.youtube.com/watch?v=drxOs1ieK-Y

 

Quite the contraption for such a simple thing,lol. We just need these disassembly guys to figure out how to bypass the heater circuit in the code!

I just got in my 75 ohm resistor and bench tested it at 14.00 volts for 30 minutes and it holds steady at 250*F. A single 50 ohm 10 watt ceramic resistor from radio shack topped out a 220*F on the bench which is cooler but it has 4 times the footprint as the 75 ohm resistor which means it will radiate a larger area of heat.

 

Any news on how close they are?You guys have already answered my Mitsu prayers with that damn cel,im going in for inspection this week lets see if it passes.Can i check to see if the readiness check is working with Scantech?

 

scantech does tell you what readiness tests pass. they pass no problem with the resistor, or o2 sensor in, as long as you haven't unset the periphery bits.

 

Radioshack didn't have much to work with so I purchased a 10ohm 10W ceramic pair. Plugged one in and it still threw the CEL. Then tried running them in parallel and still failed. I suck at this.

 

10 Ohms / 10W ?

hmmm lets see...

P = E*E/R = 14 * 14 / 10 = 19.6W


so you're putting 20W through a 10W resistor. thats a great way to burn it out, or start a fire.

and then you're putting 2 in parallel, which i said previously doubles your heat output, and current draw.
you should really leave the experiments to someone who knows the basics. or use one of the setups that have already been verified to work.