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

[qshipq at aol.com]

I'm just of the thinking that this VR masked a different problem, as I understand spark ignition to work.  Plenty of other marques using less than 14.5v LS2 under boost.  When was the last time JC put in and/or tested his battery?  And I've done hesitation diagnostics, but never thought to solve them with a VR.  Hence intrigued.  That said, I have never had to use that 'fix' either.  Not many LS2 coil experiences tho.

Here's hoping it really was the problem

Cheers

SJ


 

 

-----Original Message-----
From: Marc Swanson <mswanson at mswanson.com>
To: qshipq at aol.com
Cc: jc at j2c3.com; s-car-list at audifans.com
Sent: Fri, Feb 11, 2011 8:28 am
Subject: Re: LS2 coil adventures part 17...


On 2/11/2011 9:16 AM, qshipq at aol.com wrote: 
> Isn't that a better primarily a function of spark plug gap?  SAE > 2001-01-0245.  This is where some before and after measures would have > helped.  I look at a 5ms LS2 coil at full charge, 
 
"full charge" changes after every spark event, so in the milliseconds between events where the input voltage is dropping your available spark energy is also dropping.  If I had more time to play I'd be happy to hookup my scope to the input power lines to show what happens to the line voltage, but I don't.  If I let everything be a science experiment I'd have no time to get real work done ;)  It was broke, we changed one variable and it fixed it.  thats scientific enough for me. 
 
> and think a VR of 13.7 vs 14.5 isn't going to affect charge time much > at all.  Put another way, that's such a small change, I'd be concerned > that with any increase in spark gap, the 'problem' comes back. 
> 
> My point being, I believe there is another underlying problem if a .7v > increase in VR rids one of ignition hesitation.  Not trying to bust > yer balls, just massively intrigued by this logic train. 
> 
> SJ 
>