[s-cars] More dyno results

[Joe Pizzimenti]

So who wants in on a betting pool?

I say we do it Superbowl style, and have a tournament.  

Use MS Excel:
http://www.cheapassracing.org/s-car/DawsonPool.xls

$20.00 buy-in, winner splits it with Dawson 50/50, minus paypal fees.

Who's in?

Joe, shouldn't this be in the Marketplace?, Pizzo


On 7/5/05, Djdawson2 at aol.com <Djdawson2 at aol.com> wrote:
> For those who aren't sick of seeing my dyno posts  ;-)...
> 
> This past Saturday, I was able to do a little more time at the dyno.   As of
> my last dyno post, the car was making 418/445 at the wheels, (like it or  not)
> SAE corrected.
> 
> Since that post, a few things have been done.
> 
> First, the turbine housing on the GT30R was changed from a .82 to a .63 A/R
> unit.  This was aimed at providing a quicker "hit" (which it does), but
> should result in a lower peak hp.
> 
> Second, an additional resonator was added to the exhaust system to  eliminate
> the drone... again, should result in a reduced peak number.
> 
> Third, I decided to try a very cheap FMIC.  I purchased a bar and  plate IC
> on ebay that cost $229.  It has a 22" x 8" x 3.5" core, and has  cast aluminum
> end tanks with 2.5" inlet and outlet already built in, and in the  correct
> location.  I also bought a box of 6 2.5" polished aluminum 90  degree elbows that
> each had one long leg.  This was $79.99.  Other  than that, the "kit"
> required 2 2.5" silicon 45 degree elbows, a 2 - 2.5"  silicon transition, and one 4"
> section of straight 2.5" silicon hose... about  $60 for that stuff.
> 
> The FMIC was surprisingly easy to put together... took about 6 hours of
> work.  I did the welding myself, but that could have been eliminated by  simply
> using silicon connectors.  The whole thing cost under $400, but the  labor was
> "free."
> 
> Off to the dyno...
> I did 3 pulls, and all were remarkably similar, indicating that the IC was
> performing very well.  Previously, I would see large losses between pulls  with
> the stock IC.
> 
> The numbers were 442/430, and only varied by 1 hp, or 1 ft/lb between  runs.
> In fact, the third one was the highest reading.
> 
> Other interesting notes... The hp figures no longer looked like  peaks.  In
> fact, the curve would cross the 420hp line, and remain there  until 7500rpm,
> where I would end the run.  The "area under the curve" was a  huge improvement
> compared to prior runs.  These things all seemed to  indicate that el cheapo
> FMIC was performing great.
> 
> Bad news... I lost 15 ft/lbs of torque, even though the curve as a whole
> looks better.  Lastly, don't ask me for a copy of the dyno chart, as I  don't
> have any yet.  The guys at MAC Autosport lost the files, and all I  have are the
> printouts, which I'll try and make available soon to those who may  want them.
> 
> 3 last things to try include a 928 MAF, and RS2 exhaust cam, and a return  to
> the .82 A/R turbine housing.  The .63 does hit a little earlier, but
> compressor surge is a problem in higher gears/low rpm.
> 
> I'm thinking that I should be able to get this engine into the 470-480  range
> when all is said and done.  After that, I'll drag it out to sea level  for
> some dyno runs, as well as some real quarter mile runs to provide data  that
> some feel is more valid than the SAE corrected data.
> 
> That's it for now.
> Take care,
> Dave
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