Calling Ben Isle 5 - Please help us find out the 96/97 CLT Bias Resistance.
03-11-2008, 04:19 PM
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Calling Ben Isle 5 - Please help us find out the 96/97 CLT Bias Resistance.
As most of you know the 96/97 cars have a different CLT bias resistance then all the other cars. In a for sale thread, Ben said that with a proper thread and appropriate information he will help us take a direct measurement of the bias resistor inside the factory ECU.(at least thats what I understood from his post).
Right now I am running 1540 which was discovered by Arkmage and while very accurate, withing 5-8* of the MAF, it would be nice to have it even more accurate to prevent the CLT temp from pegging at 215 when the engine is fully warm.
We need to help him locate the appropriate resistor inside the ECU. I dont have a picture, and I dont know how to explain which one it is.
So. Anyone know how to help him find the proper resistor to take a direct measurement?
Right now I am running 1540 which was discovered by Arkmage and while very accurate, withing 5-8* of the MAF, it would be nice to have it even more accurate to prevent the CLT temp from pegging at 215 when the engine is fully warm.
We need to help him locate the appropriate resistor inside the ECU. I dont have a picture, and I dont know how to explain which one it is.
So. Anyone know how to help him find the proper resistor to take a direct measurement?
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03-11-2008, 04:32 PM
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signal goes through like 3 resistor. heck on my 1.6L ecu the AIT signal shares 2 of the resistors from the CLT signal.
if i add the resistors up i get 15000ohm and 10000ohm each. if i take the resistance at the connector i get 3630ohm. The actual bias resistance is really close to 2625 ohm.
you'll never read over 215° with MSI, so if the fans are kicking on at the right spot, you have the right value.
if i add the resistors up i get 15000ohm and 10000ohm each. if i take the resistance at the connector i get 3630ohm. The actual bias resistance is really close to 2625 ohm.
you'll never read over 215° with MSI, so if the fans are kicking on at the right spot, you have the right value.
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03-11-2008, 04:37 PM
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signal goes through like 3 resistor. heck on my 1.6L ecu the AIT signal shares 2 of the resistors from the CLT signal.
if i add the resistors up i get 15000ohm and 10000ohm each. if i take the resistance at the connector i get 3630ohm. The actual bias resistance is really close to 2625 ohm.
you'll never read over 215° with MSI, so if the fans are kicking on at the right spot, you have the right value.
if i add the resistors up i get 15000ohm and 10000ohm each. if i take the resistance at the connector i get 3630ohm. The actual bias resistance is really close to 2625 ohm.
you'll never read over 215° with MSI, so if the fans are kicking on at the right spot, you have the right value.
Do I have to make bias lower or higher to make it read lower?
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03-11-2008, 04:46 PM
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so it seems with the 8-bit resolution...
I'm wondering if we remove some of the -40 to -20 degree CLT temps, we can add 20 more up top....so you can at least see to 235°
interesting read:
http://www.msefi.com/viewtopic.php?t=22517
I'm wondering if we remove some of the -40 to -20 degree CLT temps, we can add 20 more up top....so you can at least see to 235°
What you can't do, especially with the MS1 implementations, is enter values greater than 215 because of the 8-bit variable limitation in the processor. Remember, you have to also allow for values below 0 -- 215 + 40 = 256 distinctive values. However, now that we've got the MS2 with more horsepower, that limitation raised a little higher Smile
interesting read:
http://www.msefi.com/viewtopic.php?t=22517
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03-12-2008, 02:35 AM
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It's not a matter of writing a script, it's just that every function that takes CLT as a parameter, expects the CLT to be (CLT-40)F because of the said design. So, it's not that you will just "Find & Replace" every occurance of CLT with CLT+40 (remember this is assembly, not C).
Anyway, I just got bored and didn't want to overflow the code, the maxmem limit is already reached.
Jim
Anyway, I just got bored and didn't want to overflow the code, the maxmem limit is already reached.
Jim
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03-12-2008, 10:05 AM
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according to the link i posted, it seems some people are modding the thermfactor file to display higher temps based on the resistance curve, just not changing .s19 file burnt in MS....so at least it outputs on your screen and MS is none-the-wiser...
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