HOW-TO: Oxygen Sensor Voltage Clamp

[Alejo_NIN]

Here's a little diagram to make your own Voltage Clamp found at miataturbo.net

This resembles the Voltage Clamp made by Flying Miata...

i no way i'm posting this to replace a quality product made by FlyingMiata.com and sold by Protegegarage.com and Speedcircuit.com

Here is the diagram:

parts could be bought from RadioShack.

The hardest part to find is the Pressure sensor.
I was given a part number by the author of this how-to, who actually sells them for 60$ shipped, but the part is only sold in big quantities forcing me to source other parts. The person i contacted at World Magnetic suggested i tried a different part for my purposes from DigiKey and he was kind enough to provide me with a part number.

Parts List:
LED (any color you'd like) LED itself without resistor included
1K Ohm Resistor
7K Ohm Resistor
470 Ohm Resistor
5K Ohm Potentiometer with multiple turns for fine tuning.
Pressure Switch:
Digi-Key Part Number 384-1012-ND
Unit Price: $14.36
Manufacturer Part Number: 9011-904
Description SENSOR ADJ PRESS SW 1.0-4.0 PSI

everything else you should be able to find at radioshack or soemthing

enjoy...



(used by google: 02 voltage cmalp oxygen sensor voltage clamp mazdaspeed protege voltage clamp protege voltage clamp miata voltage clamp diy DIY do-it-yourself voltage clamp)
in no way i will be responsible if you blow up your car into tiny pieces that not even my grandma, who can do a 1000 piece puzzle of a clear blue sky in one hour would be able to put it back together. If you aint' got the ball, walk away!

 

[kamon8404]

What exactly would this help? Dimming lights and dash panels?

 

[Alejo_NIN]

ooh sorry

it helps people running piggy backs

basically, if you don't know what a voltage clamp is, chances are you don't need one...so your cool

 

[bazooka joe]

just ordered my pressure sw...off to the "tandy" store tonight...gonna put my mad electrical skilz to work!(flash)

 

[Alejo_NIN]

i actually assembled one, just haven't been able to test it
i think i got an exra resistor installed that i got to remove tho

 

[bazooka joe]

cool, i won't be able to test my for a week or so...waiting on the begi rrfpr

 

[bazooka joe]

should have the begi next week some time, wiring up the voltage clamp tonight...can i install that in the cab of the car i wonder?

 

[KrayzieFox]

Bazooka Joe .. if could post detailed instructions on this install I would be in your debt forever. As you already know, I'll be doing this shortly and I'd love to have some instructions so I don't mess it up.

 

[bazooka joe]

Bazooka Joe .. if could post detailed instructions on this install I would be in your debt forever. As you already know, I'll be doing this shortly and I'd love to have some instructions so I don't mess it up.

sure, but i haven't got to it yet...was away all last week and going away again for a long weekend the next 2 weeks....

 

[Speed3.5]

what's the power-(W) on those resistors ???

 

[Alejo_NIN]

1/4

 

[asmo 03 mp5]

What should power output be? .32v or 3.2v

 

[Alejo_NIN]

.4v

 

[Nightmare]

Could this theorticaly work as an FCD?

 

[Alejo_NIN]

theorically, it works as an FCD

 

[Nightmare]

i will assume that ill have to get a trim pot for 4.8 or 4.9v


Have you looked at the hobbs pressure switches? ive been told the switch we require is sold at napa for $20 or so.

 

[Alejo_NIN]

is not 4.8 or 4.9 V

is 0.4

ZERO POINT FOUR

otherwise, you'll blow your O2 and your ECU

voltages are too high at 4v

 

[Nightmare]

I'm still talking about an fcd here.


i was under the impression that the maf sensor reached fuel cut at 5v, requiring me to cap it at 4.9v.


I'm already aware of the 02 voltages.

 

[Alejo_NIN]

sorry, i don;t know nyting about FCD

 

[Nightmare]

Well, the best it has been explained to me, is alot like what you've drawn out there, less the resistances.

A really nice fellow by the name of Genius once disected a joeP unit, and had told me how it worked. But since then i have lost the instructions to create one of these again.

Though i am suprised the no one has posted a how to on making one of these units. I do understand that they open the doors to people potentialy harming thier motors, but hey, Darwins law.