The Official Overboosted Overlords Club
10-25-2009, 12:08 AM
#1476
Life begins @ 30 psi
Join Date: Mar 2008
Location: Columbia, MD
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The Synapse Syncronic I've heard nothing but good things about... I'm seriously considering getting one. I noticed a pretty significant difference between recirc and VTA with the GReddy RS BOV. Throttle response suffered, and I had boost lag compared to recirc. Thats in addition to the huge explosions every time I took my foot off the throttle.
10-30-2009, 05:25 PM
#1477
I'm still running the std leading and trailing plugs but with summer heating up I think it is probably wise to run a cooler plugs.
what are the pros on cons of the various spark plug configurations?
I could just run all trailing plugs as I have a spare set. this seems like there
is a risk of having the trailing plugs fire out of sequence since mazda thought a cooler trailing plug is necessary.
or I can run FD plugs for leading and trailing. this set-up needs spacers but I have no idea of how to find and setup the spacers?
the other problem I may have is poor compression on the rear rotar that makes my car hard to start. I have read that cooler plugs may make the car harder to start.
anyone like to give some advise?
what are the pros on cons of the various spark plug configurations?
I could just run all trailing plugs as I have a spare set. this seems like there
is a risk of having the trailing plugs fire out of sequence since mazda thought a cooler trailing plug is necessary.
or I can run FD plugs for leading and trailing. this set-up needs spacers but I have no idea of how to find and setup the spacers?
the other problem I may have is poor compression on the rear rotar that makes my car hard to start. I have read that cooler plugs may make the car harder to start.
anyone like to give some advise?
10-30-2009, 05:56 PM
#1478
/\ yeah - my car takes about an extra 0.5sec to start with the colder plugs in .
FWIW the spacers (on the trailing) are just precautionary as there is not actually any interferance without them - contrary to popular belief . If you can get the crush washer off another plug somehow - that would be sufficient to allow plenty of clearance .
FWIW the spacers (on the trailing) are just precautionary as there is not actually any interferance without them - contrary to popular belief . If you can get the crush washer off another plug somehow - that would be sufficient to allow plenty of clearance .
10-30-2009, 06:09 PM
#1481
Here we go, again.......
If you're gonna use colder plugs use the BUR9EQPs on the leading side and the RE9B-Ts on the trailing side. Simple as that and MM has been doing it for a long time.... sans "spacers".
It is when one uses the BUR9s on the trailing side where spacers become necessary, which is pointless as the OEM Iridium plugs are already 9s.
If you have a set of "H.O." ignition coils use nothing less than Platinum plugs as the coppers will quickly be destroyed by LS, Yukon, and MSD coils.
If you're gonna use colder plugs use the BUR9EQPs on the leading side and the RE9B-Ts on the trailing side. Simple as that and MM has been doing it for a long time.... sans "spacers".
It is when one uses the BUR9s on the trailing side where spacers become necessary, which is pointless as the OEM Iridium plugs are already 9s.
If you have a set of "H.O." ignition coils use nothing less than Platinum plugs as the coppers will quickly be destroyed by LS, Yukon, and MSD coils.
10-30-2009, 06:21 PM
#1482
Hole depth to shoulder = 21.2
plug thread length to crush washer ,when crushed = 20.5 (21.5 to shoulder)
0.7mm clearance - bit close for comfort so an extra crush washer is all that is required .
When you learn how to use your vernier calipers get back to me .
Last edited by Brettus; 10-30-2009 at 06:42 PM.
10-30-2009, 06:24 PM
#1483
thanks Charles
excuse my ignorance, what's "H.O." ignition coils? in another thread of yours If I remember correctly BUR9EQPs are platinum so there doesn't seem like anything to worry about?
excuse my ignorance, what's "H.O." ignition coils? in another thread of yours If I remember correctly BUR9EQPs are platinum so there doesn't seem like anything to worry about?
10-30-2009, 06:33 PM
#1484
H.O.= "high output".
The "P" in "BUR9EQP" means Platinum. NGK also offers a "BUR9EQ". Big difference so check the box before you buy 'em.
10-30-2009, 08:22 PM
#1487
When you do the same, you will be quite dismayed.
The "hole" isn't the issue.
The curvature is.
The "mating" surface (which shouldn't be mating) is comprised of two different shapes.
I already posted the borescope pics to explain the proper caliper technique.
With Yukon coils and copper plugs at 9+ PSI, you will only get 5k - 7k of useful, full performance miles.
I've actually destroyed a new set of copper plugs in one track weekend. (Not detonation.)
The "hole" isn't the issue.
The curvature is.
The "mating" surface (which shouldn't be mating) is comprised of two different shapes.
I already posted the borescope pics to explain the proper caliper technique.
I've actually destroyed a new set of copper plugs in one track weekend. (Not detonation.)
10-30-2009, 09:23 PM
#1488
The plug is very easy to measure however and the fact that you could not do that right leaves me pondering about your effort .
BTW ayone who has a plug and thinks they know how to measure stuff should do it and then chime in here - cuz MM can't seem to get it right .
The final test of course is to get an old housing . Look in the hole with a torch and you should see a dark carbon stain at the bottom .
Then screw in a plug , tighten it up good , then remove it . If there was interferance you should see a bright 'witness' mark at the bottom of the hole . Such a mark was absent when I did this proving ,to me anyway, that there is no interferance.
Last edited by Brettus; 10-30-2009 at 09:37 PM.
10-30-2009, 10:03 PM
#1490
Originally Posted by MazdaManiac
With Yukon coils and copper plugs at 9+ PSI, you will only get 5k - 7k of useful, full performance miles.
I've actually destroyed a new set of copper plugs in one track weekend. (Not detonation.)
Edit: Ah crud - my last set of plugs were platinum.
Last edited by maxxdamigz; 10-31-2009 at 02:27 AM.
11-06-2009, 03:43 PM
#1494
You are destined to do things the hard way huh? HAHA; kgparts will make them bigger, balance them and tell you exactly what they flow - makes tuning way way way easier since it takes the injectors out of the equation.
11-06-2009, 04:06 PM
#1498
My airflow is 360g/s which does not seem that high compared to others on here but maf scaling has a bit to do with that .....
Not sure of the psi - it's about 10psi at 7500
11-07-2009, 12:19 AM
#1499
I know its around 350 because i saw 30g/s (at a higher ambient temp) more airflow than what i saw on the dyno when it made 325 .
My airflow is 360g/s which does not seem that high compared to others on here but maf scaling has a bit to do with that .....
Not sure of the psi - it's about 10psi at 7500
My airflow is 360g/s which does not seem that high compared to others on here but maf scaling has a bit to do with that .....
Not sure of the psi - it's about 10psi at 7500
11-07-2009, 12:40 AM
#1500
well - not quite .
I've noticed that you get much better whp if your pressure is decaying from a higher level than if you are at a set pressure right to the redline .
Not to mention that the 10psi was a rough approximation - not a logged variable ....
I've noticed that you get much better whp if your pressure is decaying from a higher level than if you are at a set pressure right to the redline .
Not to mention that the 10psi was a rough approximation - not a logged variable ....
Last edited by Brettus; 11-07-2009 at 01:05 AM.