[s-cars] LS2 coil adventures part 17...

[qshipq at aol.com]

 What spark plugs were in said motor? I'm having a hard time understanding a coil pack problem being voltage with a COP application.  Having just gone thru WOT spark dropout on a stage II chipped on my 3B motor with no real options in terms of Coils, I decided to do a spark plug swap.  Swapped used F5DPOR's in, and immediately solved the problem until the Laser iridiums arrive this coming week.

I read and get a lot of complaints on coil packs that end up being spark plug issues, mostly the crappy bosch F5DPOR's getting a burn in the electrode that is really tough to see with the naked eye - which eventually takes out said coil pack.  Can alternator upgrade increase the strength of the spark?  I suppose so, but there are plenty of 3bar chipsets I have running in S cars for years with bone stock coil packs, no change to the VR.  

I'm sure you guys already did/checked the plugs, but this is a tough 'fix' for me to really grasp.

But I've been known to be 'dizzy' before

Scott J


 


 

 

-----Original Message-----
From: JC <jc at j2c3.com>
To: 'S-CAR list' <s-car-list at audifans.com>
Sent: Wed, Feb 9, 2011 9:14 pm
Subject: [s-cars] LS2 coil adventures part 17...


This a repost for folks over here who might not hit the QW... interesting

and happy result for me this week:

 

Recap - I tried to run the LS2 setup for a while but had a hard misfire at

boost most of the time, especially when the car was warm, and I'd

reluctantly gone back to old OEM coilpacks. But when I went to 1+ and the

Freescale 3.0bar MAP, the old coils just couldn't take the stress and when

they'd heat up they'd start to stumble and miss like crazy at WOT high

boost. 



So... Marc suggested some time ago that maybe he was sniffin' that some cars

that fussed over LS2 coilsets could be a little underweight in the

alternator/volt-reg department. Well on Sunday I finally got a new 14.5v V-R

popped into my 120a S6 altnater and then rocked up on Monday to EFIX HQ. 



A first quick ballpark test on a 1.8T setup was 100% good, and frankly I'd

have taken that home all day, but Marc wanted to give the LS2 a try too and

in the name of science I was all for it. 



Long story short, perfect pulls everytime, none of the hard dropout misses

that I had before. Now a couple days later, car is still running like a

dream and consistently hitting full expected boost on my 1+ chipset w/ the

Freescale MAP. WOOT. 



So... for anybody struggling w/ misfires AFTER doing a big-coil upgrade,

CHECK the volt-reg and alternator. 

Easy cheap quick fix to replace BTW, even if you drop the nuts in the belly

pan in the snow and ice (as long as you have extra 8mm nuts in a pile of

junk someplace).



More thumbs up to Marc for the help and support. 100% solid!