lynnriderm6
Member
Are they good with the ms6's or no any issues???
I have a wotbox laying around if any1 is interested...
...Continue.
Fuel cut and ignition cut both have downsides so the only reason the AP is better is becaause the tune. Not the no lift shift and 2 step function.
Fuel cut heats the cylinders
Ignition cut bypasses the fuel to the exhaust
Replace cat due to possible fuuel in it...or replace a motor because the piston got hot due the fuel cut.
Id replace the cat. Most people performance oriented have test pipes anyway so the fuel is a mot point. And the wot box doesnt cut the same cylinder over and over again. It alternates each cycle so the fuel is burned mostly on the next cycle.
Fuel cut reduces the fuel at the injector consistantly every cycle.
again....if the AP was only for 2step and no lift shift...niether would be better.
While I agree with you that holding at the fuel-cutting rev limit for prolonged times would heat cylinders, in practical application the cylinder temperature change would be negligable. Because of the fuel cut, an inferior combustion event would occur in comparison to a combustion cycle without fuel cut. There is less fuel to initiate and carry out the reaction.
As far as replacing an engine because a piston got too hot, I don't agree that this would be the cause of that unless you deliberately intended to blow an engine using this. In that event, it can be argued that you would arrive at the same outcome if you were pegging off of any rev limiter.
The raw fuel is not a moot point for the Mazdaspeed folks. The MS3 and MS6 both have two catalytic converters. The second cat is removed via the test pipe, but there is still another in the downpipe. Most users of the MZR DISI 2.3T platform, although they would like to, will not ever install a catless downpipe. Most go with a high-flow catted downpipe, which is still affected by the raw fuel. It should also be noted that the droplets of fuel that are exhausted have the potential for critical damage of the turbine wheel when the turbine is at high revolutions (i.e. wide-open throttle).