Speed Density eManage Ult help

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09-13-2010, 03:54 PM
blindmist

Hmmm. What should I do? What should I do? I just feel really confused now.
09-13-2010, 05:56 PM
B-Man

Quote:

Originally Posted by Monster Stealth

That is one open I guess, I decided against that because I only want one variable for intake temps and fuel, and I want to control it. I am running a fixed temp to the ECU, and then running the GM IAT directly to the EMU. However, I do have a problem with this. At this point in time I do not know the correct pull up resistor (bias resistor), so ambient temps show -3c right now. I am working on it, but so far have no solution other than grabbing a variable resistor and playing with that until it reads ambient, but if I can avoid that and someone already knows the solution I would consider that ideal. I know FRED 62 in France runs it this way, but he has not contacted me back yet with what value resistor he is using.

http://dl.dropbox.com/u/168836/Pic%2.../GMIATBias.png

I've read 2.7K Ohm between IAT input and ground, but that's from the EMU thread on 3stech that I believe you've seen. Have you though about using a potentiometer?

Locking the ECU temp is the best way to go IMO. Think of it this way. If the ECU adjusts .5% duty cycle for temp, expecting 360cc injectors, it's actually going to add .5% duty cycle on whatever injectors you have (680cc in my case)
09-13-2010, 06:01 PM
Monster Stealth

Quote:

Originally Posted by B-Man

I've read 2.7K Ohm between IAT input and ground, but that's from the EMU thread on 3stech that I believe you've seen.

Locking the ECU temp is the best way to go IMO. Think of it this way. If the ECU adjusts .5% duty cycle for temp, expecting 360cc injectors, it's actually going to add .5% duty cycle on whatever injectors you have (680cc in my case)

I do have the ECU IAT's locked. I am thinking that if I match the resistance of the OEM ECU IAT input then I should be able to swap out my current bias resistor and my temps will read correctly. I am just waiting on a local friend of mine with stock MAF and wiring to get me that number.
09-13-2010, 06:06 PM
B-Man

Sorry, I was directing the locking ECU IAT part more to blindmist.

You're just trying to swap resistors to lock your temp to something other than -3*C? Use a potentiometer until you get the resistance you want?
09-13-2010, 06:09 PM
Monster Stealth

Quote:

Originally Posted by B-Man

Sorry, I was directing the locking ECU IAT part more to blindmist.

You're just trying to swap resistors to lock your temp to something other than -3*C? Use a potentiometer until you get the resistance you want?

I am trying to find the correct bias load resistor from my 5v source so that the EMU gets the correct temp. Right now with a 2200 ohm resistor it shows -3c at ambient which obviously for Sept in Indiana is not correct :)
09-13-2010, 06:10 PM
B-Man

Ah, for the EMU. I think I get what you're trying to do now.
09-13-2010, 08:23 PM
blindmist

I am still lost as to what this A/F harness I have for the EMU is for, and where it hooks up.
09-13-2010, 08:29 PM
Monster Stealth

Quote:

Originally Posted by blindmist

I am still lost as to what this A/F harness I have for the EMU is for, and where it hooks up.

It is the harness that integrates your WBO2 into your EMU, it will plug into the option 1 or 2 port along side the Greddy MAP sensor.
09-13-2010, 08:35 PM
blindmist

Quote:

Originally Posted by Monster Stealth

It is the harness that integrates your WBO2 into your EMU, it will plug into the option 1 or 2 port along side the Greddy MAP sensor.

I guess I should get a wideband huh?
09-13-2010, 08:57 PM
Monster Stealth

Quote:

Originally Posted by blindmist

I guess I should get a wideband huh?

Yes sir :cool:

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