[s-cars] back to the dyno

[Joe Pizzimenti]

Why not use a boost controller?  The more modern electronic units like
the EVC V and AVC-R have so many settings and adjustments, it's silly.
 It would take all of a half hour to rig up an HKS boost controller
and you could hold 26-27psi to redline, if you so desire.

Joe


On Fri, 5 Nov 2004 17:26:40 EST, djdawson2 at aol.com <djdawson2 at aol.com> wrote:
> After way too much time spent trying to figure out the drop-out issues during
> my last trip to the dyno, the problem was finally solved by some attention to
> the ignition system... in particular, the spark plug connectors.  With the
> problems cured, I went off to the dyno again to see what I've got.
> 
> The last trip indicated 387/413, with a clear difficulty at about 4900rpm.
> That solved, today the engine made 418/445... so a nice improvement.
> 
> Power robbing problems yet to solve:
> 
> The intake... currently I'm running a stock MAF (no screens) with a cone K&N.
> It's all I can fit with the stock oil cooler in place.  The K&N is packed in
> right next to the oil cooler, so air sucked into the filter is no doubt
> assisting in keeping my oil temps lower, but raising my intake temps.  Fixing this
> can't be done without relocating the stock OC, and that can't be done without
> relocating the stock IC.  Some day.  However, a big ole MAF is being worked on
> by Steve Eiche at Shadetree to upgrade from the stock unit.  Should certainly
> flow better, and hopefully no concern about wire failure.
> 
> The IC... while I've never been convinced that the stock IC is a poor unit,
> the location is certainly bad, at best.  In addition, my stock IC quite audibly
> leaks under a 10psi  pressure test.  Needless to say, there's room for power
> gains here.
> 
> A/F ratio... the engine is running somewhat rich (below 12:1 from 3500rpm on
> up, and down in the 10s near redline).  I can work on this with my new
> adjustable FPR, but haven't played with that yet.
> 
> Boost control... I'm currently regulating boost with only a WG spring (the
> stock one).  The WGFV, along with the software's boost profile, doesn't allow
> more than 24psi, and drops out fast, so that is currently out of the equation.
> The stock spring allows a quick boost peak of 27psi, and then it slowly fades,
> eventually down to about 16psi at 7k rpm.  I would like to stay away from
> using a boost controller, if possible.  Certainly, if I can come up with some
> means to allow boost to hold its peak, there should be a significant increase in
> the area under the curve, instead of the rather rapid decline from peak that
> currently exists.  There may even be an increase in peak power as well... we'll
> see.
> That's it for now, and graphs can be had for those interested.
> Dave in CO
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