IAT timing tricker for nirtous...
 

Can anyone send me a diagram on how to do this??... Something like a 750ohm resistor or something.... I have a zo6 maf so I have the 5 wire MAF... I need to know what color wires do what on the IAT wiring on the MAF... Here is a diagram I found can someone elaborate on it....

http://ls1tech.com/forums/attachment...chmentid=21043

From what it says put power to point C...ok how's that work a 2 pole switch??? from the batt. to one pole then the other pole to the "point C" on the diagram????

Also wires A & B that come from the pcm... what color wire (meaning POINT B) goes to the relay??



Thanks.....

Anyone.....????:smash: :bigears

Do a search over at tech, this was a resent topic. I can't remember myself, it's been a few years since messing with this.
Robert

I tried, but couldent find which wires on the IAT sensor do what...

Check back in a bit to the diagram over at tech, I will post the info I have on what pinout from the pcm connectors. from there you have to use an ohm meter to verify at the IAT. I only have certain years info, so...
Robert

Where should I look at ls1tech...nitrous section??? could you e-mail it to me?? Pm sent..

Yes, n2o section, the wiring sticky at the top of page, and post #112. I have some other info and diagrams on this type of trick, and think it's on the 2nd page towards the bottom, but post # not sure.
Robert

Robert, when I put the 750ohm resistor in and it tricks the IAT sensor into thinking xxx*f can I go into my efilive table IAT vs. Spark and change the value to pull say 8* of timing insted of it only pulling 3-4* of timing..??

BTW. I have Efilive

Robert, it says put power to point C.... what kind of power, 12v switched source or from the battery.. also what king of switch??? (i.e.)2 pole?? :thumbs:

BTW, the color wires are correct for all years. I just looked at the car (01 z06) and thoes were the ones....

What are you trying to accomplish by doing this?

If you don't want the pcm to pull timing due to high IAT's, just edit your tune or get a 2 pin iat sensor and stick it in the nose of the car where the ambient sensor is, in front of the rad.

Yes just a toggle switch with a 12v supply. It only takes milla amps to activate the relay to switch to the resistor. ya EFI live has a Cos 5 for Nitrous. Check with Beer, he is running it and has a great timing pull set up. As for changing the amount in your program, yes as long as it's a temp you wont see n/a, or n/a you'll pill the amount you enter if ya hiot that temp.
Robert

Pulling timing while spraying only.
Robert

If he wants to pull while spraying, then wouldn't IAT's go down when spraying? He could edit his tune to pull below a certain temp...just a thought.

I sprayed a 175 shot on my silverado and never had to pull any...:willy: (only did that for 2 years though)

Otherwise, if it's the same setup as an 03 Z maf, then wires to iat are purple and tan. purple is ref and tan is iat signal

You could use the same circuit as used to activate the nos. For example, it you are running the ground thru a wot switch at floor, then use that ground to energize the relay. In which case, 'C' would have to be hot already.

Ok, but a 2 pole switch??? Power into the switch, then power comming out of the switch, going to "point C" on the relay???

Thanks, Id rather do it this way (no COS)... I had this on the car years ago, but I didnt wire it, cartek did... It was set to see 130* IAT temps, verifyied by my diablo programmer... Like I said years ago... Only downfall to this as I remember it took a couple of seconds to trick the sensor, once again verifyied by my diablo programmer.. I watched the IAT sensor go to 130* and I was good to go....

So ill do this for my street nitrous kit, and the DP will be strictly in the tune...:thumbs:

No sir, wet kit into the TB

Ok, so if your wires are tan and purple, then according to your diagram of the relay, purple is A and tan is B and goes through the relay.

when relay is NOT on, pcm sees resistance from iat. When relay IS on, pcm sees 750 ohms resistance, which will corrsepond to a certain temp...perhaps 130F.

Thats the idea boss...

EXCEPT..... reverse what you said..

Tan would be "A"
Purple would be "B"

Tan = signal "A"
Purple = ground "B"

You want to use a 1k ohm resister.This will read 140-145 degree's.
2 pole toggle switch or a 2 pole relay which works better. I use the relay to switch from the sensor to the resister only when the Nitrous is armed (or solinoid is spraying) .This way you can tune the IAT table at 140 degree's to pull whatever timing you want. Very reliable and have had cars hooked up for years like that.:)

cool, slowhawk... does the diagram look right to you??? OR could you show me/us youre wiring diagram with a 2 pole relay???

thanks

I think opposite, but it's your nickel..:eek: (why would you run the purple gnd wire through resistor ?)

One small thought....

You have a choice as to how to use the relay to trick the pcm, and the relay should last forever (or almost).

I would personally make it so the relay has to be OFF rather than ON to pull timing.

Why?

Because wiring it as per your diagram could make the engine go KABOOM :eek: :willy: , should the relay or wiring to it ever have a problem while you're on the juice.

Only downfall, is relay may wear out prematurely ..better a burnt relay than a burnt engine.

My 2 cents.

:cheers: