retard the timing by reading the knock sensor
retard the timing by reading the knock sensor
is there any unit retard the timing read from the knock sensor instead of retard the timing vs RPM or higher Boost for the KA24DE. running 8 psi and retard 1 degree, is it good enought?
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WDRacing
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Ahh, I disagree Pedro. If the stock ecu retarded timing efficiently we wouldn't be blowing motors left and right. The stock ecu is only programmed for mild detonation, like a bad tank of gas on a hot day type of thing. What we need is a knock dependent timing master. Fortunatly for us there is one. Its pretty much one of the coolest ECU's I've ever read about.
Here's a must read link for everyone on the boards. http://www.jandssafeguard.com/safeguard.html
WD
Here's a must read link for everyone on the boards. http://www.jandssafeguard.com/safeguard.html
WD
That ecu looks cool. But don't you think it's a bit much for a street driven car? I mean, i know you have ample experience when it comes to blowing up motors 
, but wouldn't it be best to retard timing based on boost and try to avoid knock ever ocurring (at least to some degree).
But if you have a motor that is continually used on the edge of detonation then the SafeGuard ecu would be a great choice.
, but wouldn't it be best to retard timing based on boost and try to avoid knock ever ocurring (at least to some degree).But if you have a motor that is continually used on the edge of detonation then the SafeGuard ecu would be a great choice.
J&S can be really installed on any motor that has some sort of electrically controlled ignition system. It simply intercepts the signal from the ecu to the ignition system, and then actively listens for the pinging with the stock knock sensor, or an added knock sensor. When it hears it, it knows which cylinder the knock came from and then you can decide whether you want to retard one of the cylinders or all of the cylinders.
I was able to get my hands on one of the olders J&S "classics" a little while back and I'm definately going to be putting this in when everything is set and ready. I already have a pressure switch that will allow the J&S to go "hot" when boost threshold is reached.
A bit extreme?
Well not really, the during tuning you can retard the timing a set amount, however you have no idea what this translates into in any other condition of the weather or altitude. Say you tuning the car on a nice day with 70-80 degree whether and low humidity. It's possible to tune this car to make good power and never see the onset of detonation.
Now you take the car out to the track where the temp is 109 degrees and almost 100% humidity. The tuning that you've done is effectively out the window. Or how about a little less extreme scene, you take your car on a trip and have to drive over a mountain, lets add another factor you get a bad tank of gas... Factors can add up quite quickly.
Personally I think that it's a good safe investment, I'm surprised more people aren't using them. Actually it's rumored that there are several drag rotaries and piston runners out there are do use the system, but prefer not to mention it.
Finally if you're worried about the system not working, since there are a couple of versions out there don't be afraid to give John over at J&S a call. He confirmed that the classic I was looking at would work, he even looked up the version number to ensure that if I wanted to I could get it reprogrammed, and finally he helped me figure out the wiring and figure out how to use a pressure switch with the system. He did this knowing that he had already made his money on this unit, and that I probably wasn't going to purchase anything. He personally puts each unit out there together so he knows his systems.
UltimaSE
I was able to get my hands on one of the olders J&S "classics" a little while back and I'm definately going to be putting this in when everything is set and ready. I already have a pressure switch that will allow the J&S to go "hot" when boost threshold is reached.
A bit extreme?
Well not really, the during tuning you can retard the timing a set amount, however you have no idea what this translates into in any other condition of the weather or altitude. Say you tuning the car on a nice day with 70-80 degree whether and low humidity. It's possible to tune this car to make good power and never see the onset of detonation.
Now you take the car out to the track where the temp is 109 degrees and almost 100% humidity. The tuning that you've done is effectively out the window. Or how about a little less extreme scene, you take your car on a trip and have to drive over a mountain, lets add another factor you get a bad tank of gas... Factors can add up quite quickly.
Personally I think that it's a good safe investment, I'm surprised more people aren't using them. Actually it's rumored that there are several drag rotaries and piston runners out there are do use the system, but prefer not to mention it.
Finally if you're worried about the system not working, since there are a couple of versions out there don't be afraid to give John over at J&S a call. He confirmed that the classic I was looking at would work, he even looked up the version number to ensure that if I wanted to I could get it reprogrammed, and finally he helped me figure out the wiring and figure out how to use a pressure switch with the system. He did this knowing that he had already made his money on this unit, and that I probably wasn't going to purchase anything. He personally puts each unit out there together so he knows his systems.
UltimaSE
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