Running Leading Plugs ONLY?

85rx-7gsl-se · 03-31-2008, 10:33 PM

Unfortuantely, my driver in my Microtech for the lead coil failed so I have been forced to run only one set of plugs to get he going for DGRR '08.
The engine is a S4 13BT w/stock turbo.

My main questions are...

1. Is there a difference in the lead and trail coils as far as strength of the firing?

2. Any recommendations as far as plugs to run?

J-Rat · 03-31-2008, 10:47 PM

Wow... How far do you have to drive it like this? My car will run and idle with just the Trailings, but it is down on power. Only reason I know this is my leading coil pack died during a quarter mile pass. Was able to finish the pass though.

85rx-7gsl-se · 03-31-2008, 10:49 PM

Quote:

Originally Posted by J-Rat

Wow... How far do you have to drive it like this? My car will run and idle with just the Trailings, but it is down on power. Only reason I know this is my leading coil pack died during a quarter mile pass. Was able to finish the pass though.

I am currently running the trailing coils to the lead plugs w/ the split set to zero so essentially I am running the lead plugs only on the trailing coils. It runs fine, but sometimes loads up at idle and will pop flames on downshifts.

classicauto · 04-01-2008, 06:35 PM

Shouldn't be much difference power wise on the coils. Running a stock setup on the Haltech runs the same charge time on all of them....not sure what kind of adjustment you've got on the MT.

I'd run stock 7's and take it easy.

85rx-7gsl-se · 04-02-2008, 01:56 AM

Quote:

Originally Posted by classicauto

Shouldn't be much difference power wise on the coils. Running a stock setup on the Haltech runs the same charge time on all of them....not sure what kind of adjustment you've got on the MT.

I'd run stock 7's and take it easy.

Well, I am running 7s still...as far as taking it easy, we will see

Apparently, some drag setups run no trails either.

djmtsu · 04-02-2008, 08:12 PM

I'm running 9's all the way around. Just changed them today and all is well with the world.

Max777 · 04-02-2008, 11:15 PM

/\ Why is that? I just changed my plugs out with some 9's and 7's, and they look a lot better than the old ones in there.

85rx-7gsl-se · 04-02-2008, 11:18 PM

Quote:

Originally Posted by Max777

/\ Why is that? I just changed my plugs out with some 9's and 7's, and they look a lot better than the old ones in there.

Once you start running higher boost, its safer to run 9s all around. I don't think most people really have to switch till about 300rwhp.

03-31-2008, 10:47 PM	#2
J-Rat Rotary Fan in Training Join Date: Mar 2008 Posts: 59 Rep Power: 18	Wow... How far do you have to drive it like this? My car will run and idle with just the Trailings, but it is down on power. Only reason I know this is my leading coil pack died during a quarter mile pass. Was able to finish the pass though. __________________ 1988 10th Anniversary 554 RWHP, 395 RW Torque 10.7 @ 126! owner: www.azrx7.com Engine built by ARIZONA ROTARY ROCKETS www.azrotaryrockets.com

04-02-2008, 08:12 PM	#6
djmtsu My minds tellin' me no... Join Date: Feb 2008 Location: Murfreesboro, TN Posts: 4,043 Rep Power: 22	I'm running 9's all the way around. Just changed them today and all is well with the world. __________________ 1976 Mazda Cosmo RX-5 1976 Mazda Cosmo RX-5 2003 Toyota Tundra TRD 2015 Toyota 4Runner SR5

04-02-2008, 11:15 PM	#7
Max777 Pirate Join Date: Mar 2008 Location: Central IL Posts: 1,323 Rep Power: 19	/\ Why is that? I just changed my plugs out with some 9's and 7's, and they look a lot better than the old ones in there. __________________ Rotaries:They are NOT that complicated!

04-01-2008, 06:35 PM	#4
classicauto crash auto?fix auto Join Date: Feb 2008 Posts: 816 Rep Power: 18	Shouldn't be much difference power wise on the coils. Running a stock setup on the Haltech runs the same charge time on all of them....not sure what kind of adjustment you've got on the MT. I'd run stock 7's and take it easy.