Brettus Turbo install thread
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Boosted Kiwi
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From: Y-cat-o NZ
I'm thinking
make all the other changes but run with the Mazsport coils being very carefull about backing off at the first sign of a misfire . If the problem is still there - then replace the coils and retry . That way I'll know for sure
make all the other changes but run with the Mazsport coils being very carefull about backing off at the first sign of a misfire . If the problem is still there - then replace the coils and retry . That way I'll know for sure
Doppelgänger
Joined: Feb 2008
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From: Florida
all I can say is that my car ran fine before these coils. Once I installed them the car ran lean and something wasn't right. I brought the car to mazsport, they checked the connections then retuned it. I had detonation on the drive home. If Scott can't get it working, I have no faith in them.
Ultimately I don't think it was the coils, rather, I think it was the tune. Something wasn't right, but this is all speculation. I'd rather err on the side of safety than risk a second engine. Your money though.
We had this exact same discussion just before you went turbo, and this was my recommendation back then too.
Ultimately I don't think it was the coils, rather, I think it was the tune. Something wasn't right, but this is all speculation. I'd rather err on the side of safety than risk a second engine. Your money though.
We had this exact same discussion just before you went turbo, and this was my recommendation back then too.
Doppelgänger
Joined: Feb 2008
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From: Florida
BTW, with the advances with tuning on the rx-8, I would recommend FI to anyone that asks. Just make sure you have the accessport, a good tune on it, and a proper flowing intake so the MAF is happy. There's no more reason for engines to blow anymore unless you're playing with fire (too close to the edge).
I couldn't make that connection either - what has bum coils got to do with either pre-ignition or detonation?
Unless the allegation is that bad coils produce sparks at the wrong time, I don't see the connection - the worst that could happen is no spark, right?
S
Unless the allegation is that bad coils produce sparks at the wrong time, I don't see the connection - the worst that could happen is no spark, right?
S
One more time for the nose-bleed seats:
If you have a LEADING coil failure or misfire, such that only the TRAILING produces an ignition event, you can - and probably WILL - have a massive detonation event, especially at or around the torque peak.
In other words - trailing ignition only = snap, crackle, pop.
I don't mean to beat a dead horse, but "tested and proven" apparently has a different meaning depending on who the vendor is.
If you have a LEADING coil failure or misfire, such that only the TRAILING produces an ignition event, you can - and probably WILL - have a massive detonation event, especially at or around the torque peak.
In other words - trailing ignition only = snap, crackle, pop.
I don't mean to beat a dead horse, but "tested and proven" apparently has a different meaning depending on who the vendor is.
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Boosted Kiwi
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From: Y-cat-o NZ
One more time for the nose-bleed seats:
If you have a LEADING coil failure or misfire, such that only the TRAILING produces an ignition event, you can - and probably WILL - have a massive detonation event, especially at or around the torque peak.
In other words - trailing ignition only = snap, crackle, pop.
I don't mean to beat a dead horse, but "tested and proven" apparently has a different meaning depending on who the vendor is.
If you have a LEADING coil failure or misfire, such that only the TRAILING produces an ignition event, you can - and probably WILL - have a massive detonation event, especially at or around the torque peak.
In other words - trailing ignition only = snap, crackle, pop.
I don't mean to beat a dead horse, but "tested and proven" apparently has a different meaning depending on who the vendor is.
ouch - the front of my teeshirt is looking gruesome now.
Just a thought from a nose bleeder :
If your leading did not fire - wouldn't your trailing going off 15 degrees later just be a little retarded . Just trying to understand .
I always thought over advanced ignition was more dangerous .....
The trailing is following the leading by 15° of crank rotation, but think about where it is located physically in the housing relative to the forward motion of the rotor and the charge pocket.
Now, imagine if the whole charge is lit from back there instead of on the leading edge of rotor motion.
Now, imagine if the whole charge is lit from back there instead of on the leading edge of rotor motion.
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Boosted Kiwi
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From: Y-cat-o NZ
cool - good luck with it .
On the positive side - the rest of the motor is in great condition .
The builder says I dont even need bearings ....
He is also pretty sure that detonation caused the failure
On the positive side - the rest of the motor is in great condition .
The builder says I dont even need bearings ....
He is also pretty sure that detonation caused the failure
Last edited by Brettus; Dec 8, 2008 at 12:01 AM.
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From: Eastern Ontario
The trailing is following the leading by 15° of crank rotation, but think about where it is located physically in the housing relative to the forward motion of the rotor and the charge pocket.
Now, imagine if the whole charge is lit from back there instead of on the leading edge of rotor motion.
Now, imagine if the whole charge is lit from back there instead of on the leading edge of rotor motion.
The whole charge is not uniform; there is a higher concentration of fuel and air by the trailing plug (richer mixture) due to the sweeping motion of the rotor; then as the flame propagates out toward the leading plug - this takes a long time in our chamber - heat and pressure are pushing out to this leaner mixture (faster hotter burn); it will not be a smooth flame front consuming everything. Most likely the heat and pressure will cause the mixture in the leading area to explode uncontrollably = detonation.
The whole charge is not uniform; there is a higher concentration of fuel and air by the trailing plug (richer mixture) due to the sweeping motion of the rotor; then as the flame propagates out toward the leading plug - this takes a long time in our chamber - heat and pressure are pushing out to this leaner mixture (faster hotter burn); it will not be a smooth flame front consuming everything. Most likely the heat and pressure will cause the mixture in the leading area to explode uncontrollably = detonation.
