G
Guest
·Gentlemen:
I already know this is a sensitive, opinionated, and greatly discussed issue, so if at all possible just the facts please ... I'm not looking to start a bunch of trash talking. And yes I have read many of the previous posts via the search routine and have run many types of plugs, as I am sure y'all here have.
I have a BPU with ~ 120k miles, it starting missing at high boost/revs. My boost level is currently dialed in at 17 psi max. I am running the BCPR7ES-11, which are BPU plugs pre-gapped to 0.034".
Here is my confusion: after reading all threads concerning plugs, gapping, coil packs etc. I was about to go out and buy 6 new coil packs @ $81.00 a piece from the dealership. If I understood the posts (sorry don't remember the individual) he stated the coil packs get weak or go bad over time and once you replace them you'll be able to run at BPU levels at the original hotter plug stock gap of 0.043".
But when I consulted some local performance tuners in town they told me to just re-gap to 0.028", and that they set up their cars like that. They also said the coil packs are strong components and they hardly ever see then needing replacement. And apparently there really isn't a good way to test them based on what I have read on this group. They also said if the plug gap is too large, the spark "blows out" due to the higher cylinder pressures. Needless to say before I drop +$500.00 on coil packs I gave this a try. When the plugs came out the electrodes looked fine with a black soot residue on them (running rich as all Supra's do I assume). Bit of oil residue on 5 and 6 probably another problem like valve cover gaskets. So I gapped them down to 0.028" and now the car runs smooth as can be with no miss at all and pulls strong.
But this raises the question as you gap down the plugs you have a smaller spark hence reduced power ??? So am I losing substantial power because of the reduced gap?
So are there folks out there that already have info from previous testing ??? i.e. post their DYNO charts for the following or similiar set-ups to put this issue to "bed" ?
Examples:
BPU level car running 17 psi with new coil packs and plugs gapped to 0.043"
BPU level car running 17 psi with original coil packs and plugs gap lowered.
I guess my bottom line question is if I drop +$500.00 on all new coil packs how much if any RWHP am I going to see??
Sorry for the long message, but this is the only way I could explain my situation.
Thanks
Ron
I already know this is a sensitive, opinionated, and greatly discussed issue, so if at all possible just the facts please ... I'm not looking to start a bunch of trash talking. And yes I have read many of the previous posts via the search routine and have run many types of plugs, as I am sure y'all here have.
I have a BPU with ~ 120k miles, it starting missing at high boost/revs. My boost level is currently dialed in at 17 psi max. I am running the BCPR7ES-11, which are BPU plugs pre-gapped to 0.034".
Here is my confusion: after reading all threads concerning plugs, gapping, coil packs etc. I was about to go out and buy 6 new coil packs @ $81.00 a piece from the dealership. If I understood the posts (sorry don't remember the individual) he stated the coil packs get weak or go bad over time and once you replace them you'll be able to run at BPU levels at the original hotter plug stock gap of 0.043".
But when I consulted some local performance tuners in town they told me to just re-gap to 0.028", and that they set up their cars like that. They also said the coil packs are strong components and they hardly ever see then needing replacement. And apparently there really isn't a good way to test them based on what I have read on this group. They also said if the plug gap is too large, the spark "blows out" due to the higher cylinder pressures. Needless to say before I drop +$500.00 on coil packs I gave this a try. When the plugs came out the electrodes looked fine with a black soot residue on them (running rich as all Supra's do I assume). Bit of oil residue on 5 and 6 probably another problem like valve cover gaskets. So I gapped them down to 0.028" and now the car runs smooth as can be with no miss at all and pulls strong.
But this raises the question as you gap down the plugs you have a smaller spark hence reduced power ??? So am I losing substantial power because of the reduced gap?
So are there folks out there that already have info from previous testing ??? i.e. post their DYNO charts for the following or similiar set-ups to put this issue to "bed" ?
Examples:
BPU level car running 17 psi with new coil packs and plugs gapped to 0.043"
BPU level car running 17 psi with original coil packs and plugs gap lowered.
I guess my bottom line question is if I drop +$500.00 on all new coil packs how much if any RWHP am I going to see??
Sorry for the long message, but this is the only way I could explain my situation.
Thanks
Ron