Which CAS for 1g in a 2g?

[herostar]

Which CAS is the best to use when swapping a 1g motor into a 2g? Why? Which ones work better for which years? Why?

 

[My96AWD]

black lid out of 93 94 are the best but any will work. this is not extreme.

 

[Red 2g GSX]

you can use any 1g if you build that circut board. I might start building them and selling them. Would you be interested?

 

[Tevenor]

you can use any 1g if you build that circut board. I might start building them and selling them. Would you be interested?

You can use any 1g without the circuit board.

Thread moved.

 

[Awdboost]

Everything you need to know about CAS.

http://www.roadraceengineering.com/1gcasin2g.htm

Remember that you are a 95 So it's different then the 97-99

 

[Red 2g GSX]

The problem with the Magnus idea is your car will get random missfire codes to the ECU. So your check engine light will come on. I am not sure if you even notice it or not as far as the motor not running right. But the circut board takes care of that problem

Vic.

 

[Awdboost]

Do you have any proof that it works.. I don't think it would help. RRE doesn't say anything about helping with missfires.

 

[Tevenor]

The problem with the Magnus idea is your car will get random missfire codes to the ECU. So your check engine light will come on. I am not sure if you even notice it or not as far as the motor not running right. But the circut board takes care of that problem

Vic.

Bullshit. I never got one. Ever. Many people don't. And the people who do get it, its a problem with the sensitivity of the CAS, or rather the inaccuracy of the 1G CAS, that causes it.

Look at my name and then look at the Magnus 1G ina 2G page. I know what I am talking about.

 

[Red 2g GSX]

Bullshit. I never got one. Ever. Many people don't. And the people who do get it, its a problem with the sensitivity of the CAS, or rather the inaccuracy of the 1G CAS, that causes it.

Look at my name and then look at the Magnus 1G ina 2G page. I know what I am talking about.

Well in the magnus page they talk about how you get the code. If you do get the code from the CAS not being accurate how do you know if you CAS is accurete or not?

BTW have you ever looked at the comparison of the out put of the 1g and 2g CAS on a graph. They are not EXACTLY the same they are close but they are not. I do understand what you mean when you say that the sensitivity of the CAS makes the diffrence, but what i dont understand is how one can be diffrent than the other one.

Vic

 

[ADrewzki]

Tevenor-What year CAS do you have? I'm constantly getting the random misfire code and if getting a different year CAS will fix/help the situation, I'm all for trying it. And what the heck is this circuit board thing? I've never heard of it.

 

[Red 2g GSX]

Tevenor-What year CAS do you have? I'm constantly getting the random misfire code and if getting a different year CAS will fix/help the situation, I'm all for trying it. And what the heck is this circuit board thing? I've never heard of it.

The circut board serves as an inverter for the CAS it just gets the 1g CAS singnal closer to the 2g CAS signal. wich it makes it prevent the random miss fire codes. Do you notice the engine acting weird of not performing right or is it simply a random miss fire code

http://www.roadraceengineering.com/1gcasin2g-waveforms.htm

Look at that and try and make heads or tails out of it but you should be able to tell that the signals are opposite of each other, and the circut board makes them the same.

Thanks

Vic

 

[Tevenor]

Well in the magnus page they talk about how you get the code. If you do get the code from the CAS not being accurate how do you know if you CAS is accurete or not?

This comment leads me to believe you know practically nothing. It's a matter of accuracy of the signal wave. The 2G style magnetic pickups are MUCH MORE ACCURATE than either the Hall affect or Optical 1G CAS's. The Hall affect tend to be much more accurate than the opticals.

BTW have you ever looked at the comparison of the out put of the 1g and 2g CAS on a graph. They are not EXACTLY the same they are close but they are not. I do understand what you mean when you say that the sensitivity of the CAS makes the diffrence, but what i dont understand is how one can be diffrent than the other one.

Vic

Ugh.

Yes I have looked at the wave forms of the signals from all 3. They are NOT the same. In fact, for 95 and 96 cars, they are 90 degrees out of phase AND inverted. Where the 2G is expecting trailing edge, it gets a leading edge, and so on and so forth. This makes the injectors fire 90 degress to soon. And this is just the CAM signal. The crank signal is completely inverted. This is why the Spark Plug wires need to be swapped at the coil to fire on the right compression stroke. This is also why 95 and 96 cars SHOULD swap the injectore fire order to account for the 90 degree phase shift at idle where the injector firing order is sequential. Or get a DSMLink and let it swap the injector fire order for you.

What I mean by accuracy is this. The 2G ECU checks the crank signal for a timing differential between cycles. If it sees a slowdown, X number of cycles, then it compares the cam signal to verify where the firing stroke is at and flags a random misfire and guesses at the cylinder. In severe cases, it goes into limp mode and shuts that cylinder down.


The reason for this is because the 2G OBDII is expecting (I don't remember the numbers off the top of my head but the estimate is good for scale) no more than a 5 ms delay between crank signal lead edges. The 1G OBDI is LESS SENSITIVE in that it is only looking for more than a 50ms change in leading edge signals. So a 25ms variation in expected trigger signal will trigger a Random Misfire event in a 2G but not in a 1G.

This becomes an issue is because the 2G magnetic sensors have a wave line like this (exc use the ascii art and ignore the periods):

..............._________
..............|.............|
..............|.............|
..............|.............|
-----------..............----------------

1G signals due to being a "less accurate" sensor does this.

..............._______
............../............\
............./..............\
............/................\
---------..................------------


The ramp-up causes a error in random misfire calculation and hence why teh RM problem varies from car to car, and CAS to CAS.

Have any more questions? Go research the 1Gina2G yahoo group.

 

[dave99gst]

ive used the 91-92 green top cas and 92-94 black top hall effect cas
got a CEL from each - insulated the $hit out of my wireing. still got the CEL

got a dsmlink.. no CEL


fyi - the magnus pot-mod is dangerouse and didnt change anything on my car.

 

[Red 2g GSX]

This comment leads me to believe you know practically nothing. It's a matter of accuracy of the signal wave. The 2G style magnetic pickups are MUCH MORE ACCURATE than either the Hall affect or Optical 1G CAS's. The Hall affect tend to be much more accurate than the opticals.



Ugh.

Yes I have looked at the wave forms of the signals from all 3. They are NOT the same. In fact, for 95 and 96 cars, they are 90 degrees out of phase AND inverted. Where the 2G is expecting trailing edge, it gets a leading edge, and so on and so forth. This makes the injectors fire 90 degress to soon. And this is just the CAM signal. The crank signal is completely inverted. This is why the Spark Plug wires need to be swapped at the coil to fire on the right compression stroke. This is also why 95 and 96 cars SHOULD swap the injectore fire order to account for the 90 degree phase shift at idle where the injector firing order is sequential. Or get a DSMLink and let it swap the injector fire order for you.

What I mean by accuracy is this. The 2G ECU checks the crank signal for a timing differential between cycles. If it sees a slowdown, X number of cycles, then it compares the cam signal to verify where the firing stroke is at and flags a random misfire and guesses at the cylinder. In severe cases, it goes into limp mode and shuts that cylinder down.


The reason for this is because the 2G OBDII is expecting (I don't remember the numbers off the top of my head but the estimate is good for scale) no more than a 5 ms delay between crank signal lead edges. The 1G OBDI is LESS SENSITIVE in that it is only looking for more than a 50ms change in leading edge signals. So a 25ms variation in expected trigger signal will trigger a Random Misfire event in a 2G but not in a 1G.

This becomes an issue is because the 2G magnetic sensors have a wave line like this (exc use the ascii art and ignore the periods):

..............._________
..............|.............|
..............|.............|
..............|.............|
-----------..............----------------

1G signals due to being a "less accurate" sensor does this.

..............._______
............../............\
............./..............\
............/................\
---------..................------------


The ramp-up causes a error in random misfire calculation and hence why teh RM problem varies from car to car, and CAS to CAS.

Have any more questions? Go research the 1Gina2G yahoo group.

So what year CAS would be the best?

BTW I am impressed with how much you know its rare to find someone who knows that much. I understand what you mean but I didnt know about how the diffrent CAS are accurate or less accurate.... Interesting Well Thanks For the Help man...

Vic