NickcZ28

iTrader: (9)

Does anyone Know the resistor it takes to make the computer think it is really hot?? I need Alot less timing..any input??

Debian Dog

I will tell you if you can tell me how to wire it

Debian Dog

From a pevious thread.

BMN

I can get ya both. It is a 750 Ohm resistor. I will draw up a wire diagram of it in AutoCad too.

NickcZ28

iTrader: (9)

Thanx for the help..=)

BMN

As promised.

Poik

I'm a little confused. Just to clarify, on the subject of relays, do all relays have those same numbered pinouts? Is this a specific relay, or a generic auto relay?

Also, is it a fact as stated earlier in this thread that exactly 4 degrees of timing will be pulled with it rigged like this? Is there any way to adjust this? Thanks.

Debian Dog

Thanks.. Where do we get this relay????

BMN

All relays use this pinout reference, unless it is some realy realy realy off brand. You can get a relay at almost any parts store or radio shack. It does not have to be a real high current one. You will only be switching real small signals. Should be $5 and under.

I remembor reading that you can pull a max of 4 deg out this way.

Tiger2o69

iTrader: (16)

Thats cool. I saw this a while back and have been meaning to look it up. Basically can you run as much timing as you want untill you get knock?

Debian Dog

Well you wan the most timing NA (with no knock) that you can achieve then pull 2 for every 50 shot over 50. ie 150 shot = pull 4*

What did you all hear?

BMN

I think most agree on 2 handles most stock LS1's with a 150, BUT, 4 won't hurt, maybe your time a little.

The only problem I see with this setup: If it is 68 F outside you could use this to pull 4 deg of timing no prob, but if you are in TX or AZ and it is a 110 deg day out, the most you might get is 1 or 2 from where your car normaly runs at this temp. But hey, if it's 110 out, then I ain't leavin from in front of the AC vent at my house! Blk/Blk/Blk leather is not fun to sit on in those temps with the sun beatin on it.

Poik

That's when you hope you didn't originally tune the car in 110º weather .

SStolen

iTrader: (22)

Just to clarify. Is it definitely a 750ohm resistor?

And as far as the computer pulling timing, it would seem that the timing would be pulled based on the intake temps using the tune as a standard.
So whether you tune it in 50 or 110 degree weather, it shouldn't make a difference. The timing is what the timing is set for and any temp change will change according to the temp and timing on which it was tuned.

The real question would be, is the resistor lowering the timing because 750ohms is a set temp in the computer, or is the resistor simply telling the computer it is so many degrees hotter than it already is?

Anotherwards, does a 750 ohm resistor equal 130 degree temps always, or does 750 ohms raise the temperature up x amount based on what it already is; for example: Say 750 ohms raises the temp 40 degrees so if it is 50 it tricks it into 90, if it is 90 it tricks it into thinking it is 130. Hopefully it is the latter. Anyone know for sure? If not I will be the test mule. I am going to use autotap and record it now while it is around 40 and then again in a few months when it is around 80 to 90. Timing will either drop 4 degrees now and then or will drop to the same timing.

For example: my car is set to run at 29* of timing vs. a stock car runs at 24 (I think). the resistor will either drop 4 degrees for both of us from 29 to 25 and 24 to 20, OR both cars will drop to 20 since 750 ohms = 20 degrees.

I personally don't think the computer is meant to run with 750 being a certain timing. I think 750 will just lower the timing so much from where it is already running regardless of outside temp.

SStolen

iTrader: (22)

Where's Harlen

GPowrie

The PCM will pull a set amount of timing out by air temp. I belive it is right around 140 degrees that will pull the max amount of timing. When you activate that resistor the pcm will always think it is the same air temp. The actual degree is determined by what ohm resistor you use.

Poik

So would it be possible then to wire a resistor in series with the IAT instead of just replacing it? I guess someone should measure the resistance of the IAT at different temperatures and see what would have to be done to pull timing based on the outside temperature?

1sweetta

I think the 750 ohm res should raise temp by X amount. most home and industrial digital thermostats and hvac sensors use a 1000ohm res to tell temp (res=temp) there should be a chart of ohms=temp baised on a 1000 ohm res. then you can cross ref. that to the res. of a 750 res. agenst a known temp. to get X maby if I have time tomm. I can switch res. out on a tstat and see how much of a temp rise I get.