| Yes, we all know that blindly pulling timing when detonating at high rpm is dangerous because it causes EGTs to skyrocket. Thats not relevant here, because we're talking about detonation that is sensed by the detonation sensor, causing the ECU to go into safety boost (which is not the same as limp mode, as you claim). I'm sure you know that the det. sensor doesn't operate above 3500rpm, and thus pulling timing (as is done in the factory ECU configuration) due to detonation is not due to running the engine at its limits (high boost/high rpm), but rather from either lower than acceptable octane gas, or a poorly maintained/malfunctioning engine.
The point is that your original post is full of conjecture and blatant errors.
You say that limp mode and safety boost are the same thing, which is caused by the sensing of detonation in the engine. I have never heard of an ECU going into limp mode from detonation (or a faulty det. sensor). It will certainly go into safety boost (using the secondary maps), and this is an issue that arises very commonly . It is a good thing for this to happen on modified cars, because even though you're not controlling the boost, you are adding fuel (most important) and going to less agressive timing (less important). You claim that during safety boost, the EPROM is not read at all. If that were the case, anytime safety boost is triggered (det., cold engine), the improper injector size, intake configuration, etc, would not be selected. This obviously incorrect to anyone with a modified car. They run when they're cold. You imply that detonation arising from too much boost will be caught by the ECU, the car will go into limp mode, and you will save your engine: ''So in short, the JWT chip is safe because there is no safe information that is needed to be programmed into it. The safety maps which save the engine due to critical problems are in the the microprocessor." This isn't the case at all. Many people blow engines with the JWT chip because they turn up the boost too far. The detonation sensor/ECU doesn't protect you at all from this. The only thing that can be taken away from your post (other than a basic, vague description of how a microprocessor/EPROM works, and an incorrect description of safety boost/limp mode) is that the JWT chip is richer than some other chips, and thus provides a little more room for error, in running excessive boost and running a poorly maintained car. Your argument is that you shouldn't run an overly lean primary program with a richer secondary program with the hopes of saving your engine. That is obvious to anyone with any concept of how these systems work, and thus we needn't discuss it here.
The argument that you should be addressing is whether a properly tuned main program with a safer secondary program is preferential to a properly tuned main program without (or with an identical) secondary program. I can't see where you can argue that having an extra safe secondary program is bad, unless you're reverting to your "consistent power argument" and abandoning the safety argument for convenience.
*********************************************************
Joe
Sport 530bb/Inconel
AIM: hoyatiger81
510rwhp/520rwtq at 23 psi
"You probably never even got you hands dirty working on a car. Take care toolbox!" --djtz1
|
