Lawrence, I used a 1/4 watt 1200 ohm resistor. If you cant find any, I will send you one.

Jason

 

Lawrence, I used a 1/4 watt 1200 ohm resistor. If you cant find any, I will send you one.

Jason

Do you offer me one too? I can't find a 1200 at Radioshack.

 

Do you offer me one too? I can't find a 1200 at Radioshack.

Sure, PM me your addy and I will get some at work tomorrow and send them out.

Jason

 

 

I was wondering if anyone has had any luck wiring a 1000ohm and a 220ohm resistor in parallel to get 1200 ohms with the vpc? Also if not what wattage 1200 ohm resistor is needed? I can only find a 2 watt 1200ohm.

Thanks
Lawrence

You can use two resistors, but they need to be wired in series, not in parallel. IE: left leg of resistor #1 in pin 3--->right leg of resistor #1--->left leg of resistor #2---> right leg of resistor #2 into pin 4. Resistance in series is additive. I used a pair of 800 ohm resistors recently.

Ryan

 

You can use two resistors, but they need to be wired in series, not in parallel. IE: left leg of resistor #1 in pin 3--->right leg of resistor #1--->left leg of resistor #2---> right leg of resistor #2 into pin 4. Resistance in series is additive. I used a pair of 800 ohm resistors recently.

Ryan

Are you sure? Cause I remember a while back someone said if we can't find a 1200ohm, we should run 2 parallel ones.

Your way makes sense, and then it don't. Let's say resistor #1 is 220ohm, and resistor #2 is 1000ohm. If I run left-leg of resistor #1 to pin3 and then right-leg to the resistor #2, wouldn't the current be 220ohm anyways (so the 1000ohm is then turned into a 220ohm because it only receives 220ohm). If that makes sense.

In a nutshell, if you run it in series, won't the current be limited to the weakest link (lowest ohm)?

 

If you ran two 1200 ohm resistors in parallel, it would be 600 ohms total, so wiring them in series is the correct way.

 

Do you offer me one too? I can't find a 1200 at Radioshack.

I got my 1200 1/4 watt at radioshack, but I had to buy an assortment of something like 100. It was $7 or $8.

 

Is it necessary to use the resistor with the VPC? I checked my MAF harness, and there's not one in there.

Thanks

Scott

peace

 

My bad I ment Parallel. I soderd them together and used a ohm meter and verified 1195 ohms. I fixed the problem, i connected the white wire to the one next to the one it was supposed to be. Car is fine now. Thanks guys for the help. Now time to put on the Gt42r. :bigthumb:

Lawrence

 

My local Radio Shack had the 2.2k ohm resistors, 5 for 99 cents.

 

is a 2.2k resistor okay to use? that's what i have been using for about 2 years now and have had no problems.

AC

 

Yes.

 

Yes.

Then why do they specify a 1200ohm? What exactly is the diff then (like how does the ohm change the car's performance)?

 

Then why do they specify a 1200ohm? What exactly is the diff then (like how does the ohm change the car's performance)?

The article specifies 1200 ohm to make people's lives difficult The whole point to this exercise is to lock down the IAT trim within the stock ECU and prevent it from tripping a code.

If I had to guess (too lazy to look through my books), 1200 ohm probably equates to around 75 degrees ambient (ostensibly, zero IAT trim). Running a lower or higher ohm rating, within the sensors actual range , will lock it down as well but give the ECU the impression intake air is maybe 85 degrees vice the 75 (or so) that a 1200 ohm resistor gives.

A different value resistor may artificially apply a fuel trim, based on the different air temperature your new resistor represents, but it's nothing that the ECU won't sort out through it's STFT's and LTFT's after an ECU reset. WOT is overrided by the fuel controller in either case.

In the end, IAT is now handled by the VPC (as poor as that may be) and it applies a fuel trim to offset for different IA temperatures (if heat soak doesn't get to it first).

Ryan

 

Is it necessary to use the resistor with the VPC? I checked my MAF harness, and there's not one in there.

Thanks

Scott

peace

Bump...this question for me has nothing to do with the IAT. My VPC has a harness, it's not hardwired.

 

bump

 

bump

If you have the vpc harness, it's plug and play, you don't need a resistor.