Is the IAT's function to advance or retard timing in relation to manifold air temp? If so would it help control detonation on a turbo bike when air temp rises under boost?
Thanks,
Actually it doesn't do either. It works with fuel, not ignition. Also there is nothing on a bike that advances inginition, only retards it. You can only bring ignition to what it is mechanically set at and retard from there, you can never advance beyond that point. The reason for this is the tigger mechanism hasn't been tripped yet, so there is nothing to advance until the crank trigger sences that it's time to fire the plug. That's why all ignitions work off of retarding the ignition back from factory set timing.
As for the IAT sensor. Just think of a DRY Nitrous KIT, with these kits you point the incoming Nitrous at the sensor. Why do we do this you may ask??? Because when the frezzing Nitrous hits the sensor, the IAT sences the drop in temp and increases fuel so the bike doesn't lean out. I don't believe it works on timing at all, as a stock motor would never need it too function this way. But I am sure about it raising the amount of fuel. So the IAT actually works against a Turbo bike, as the temp increases the IAT will lean the bike out, not richen it up. This is why you don't put the IAT close to the turbo discharge and try to get it to the coolest point in the manifold. On MANY turbo kits we leave the IAT out of the plenum all together, because it works to LEAN out the motor a Turbo bike, as it lean when HOT and Richens when COLD. This is opposite to what a Turbo Motor needs. But it helps on an Nitrous motor!!!!
But you could buy a Schnitz Timing Retard or a NLR TIC-1000, both of these products retard timing under boost. I run the Schnitz unit on my Turbo GSX-R 1000 and the TIC-1000 on my Turbo BUSA. The big bike has a MoTec M400 and does everything....LOL Hope this helps....
