Many of our boosted H22's have had bad expirences as a result of detonation. What about that little device called 'Knock Sensor' that honda thoughtfully placed on the H22's, dont they work for you??? In the past I have had my car go into limp mode as a result of timing retard from the KS because it sensed extreme detonation. In order to have the car restore the timing and drive properly again, the ignition switch would have to turned off and then back on, or it would do it on its own if detonation stops and the car is driven for another 5mins or so. This would be a good enough warning for you to stop pushing the car and sort out the detonation prob.
The ecu will retard timing to a limited degree to prevent problems as a result of running gasoline with an octane rating lower than 91. The system is not designed to prevent damage from severe detonation that can occur under boost.
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Last edited by sharkcohen : 04-21-2002 at 11:32 PM.
Won't the "BTM" feature of the MSD 6 BTM help out w/ detonation & knock prevention??
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the stock knock sensor can not hear the knock quick enough before dentonation occurs, it's just designed to be there when you are using lower grade gasoline and when it's knocking it'll retard the timing. It can't save your engine from detonation. as sharkcohen said.
The BTM retards the timing as boost comes up, but you dont make as much power with timing retarded, and you'll have higher EGT.
richen up your fuel a bit, and get your car tuned properly and you should be fine.
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Michael Li
-- 1997 Prelude 5 speed -- My setup
-- 1998 Silvia S14 -- SR20DET
I did splice the J&S into the factory knock sensor- my ? about this is- is the factory knock sensor good enough to interpret the difference in boost induced knock, or is it just that Honda ECU's can't do the job correctly? (Is the problem with honda's retarding timing caused from the ECU or the factory knock sensor?)
Originally posted by Spocko I did splice the J&S into the factory knock sensor- my ? about this is- is the factory knock sensor good enough to interpret the difference in boost induced knock, or is it just that Honda ECU's can't do the job correctly? (Is the problem with honda's retarding timing caused from the ECU or the factory knock sensor?)
My understanding, as I stated above, is that the ECU is not designed to alter the timing very much, just enough to accomodate lower grade fuels. The system is not designed to save you from detonation under boost. If the J&S system can successfully utilize the stock knock sensor, then I would infer that the knock sensor is a good unit.
Originally posted by Spocko I did splice the J&S into the factory knock sensor- my ? about this is- is the factory knock sensor good enough to interpret the difference in boost induced knock, or is it just that Honda ECU's can't do the job correctly? (Is the problem with honda's retarding timing caused from the ECU or the factory knock sensor?)
The knock sensor itself doesn't "interpret" anything.. think of it as a microphone screwed into your block. The J&S has a sensitivity knob that you adjust (usually ends up around 10:30-11:00 o'clock) to determine how "loud" the knock sensor can get before the J&S starts pulling out timing.
I'm surprised that more people don't have one. It's a life-saver.
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Tony S. '03 WRX ... 12.69 @ 108.0 - full interior, stock 16s, street tires
'99 2.5RS '97 Prelude (old car) ... 13.94 @ 100.3 - full interior, empty trunk, 17s, street tires.
So, since I will probably end up with a p28 for my hondata, which does not have the capablility of utilizing the knock sensor, I can use a J&S with the stock knock sensor as an answer to that. That is cool, until this thread I did not realize that. One more part to save up for....
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In the past I have had my car go into limp mode as a result of timing retard from the KS because it sensed extreme detonation. In order to have the car restore the timing and drive properly again, the ignition switch would have to turned off and then back on, or it would do it on its own if detonation stops and the car is driven for another 5mins or so. This would be a good enough warning for you to stop pushing the car and sort out the detonation prob.
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