Correction factor is 1.07 as stated on the chart.
I just installed winpep7 on my computer



Andy

 

If I understand what you are saying is that the big deal made over Woody's 'doctored' results is that Woody's results weren't doctored No conspiracy, Andy's not a big fat liar(no polygraph necessary) and his system does in fact increase HP

 

Uncorrected Over 100F ambient and after 9 runs.

BTW I never said the first dyno we went to was accurate. In fact that's why I wnated to go to the other one. The first run at the dyno in Montgomery was the only one that seemed way off. The other runs were in the 440 range as were the first runs on this dyno before tuning. After 6 runs we got it up to the 460range. Results are in 5th gear.
Let me say it one more time....acceleration is all that matters. Dyno's are only good for tuning.
Andy

 

AND BTW 2 more GTs were dynoed today

 

It seems to me the 'unexplainable' power gains are a combonation of two things. The inherent VE innefficiency of the Porsche V-8 combined with your intake manifold.

I have no problem believing your power claims, and i've certainly seen enough dynos of your systems posted here to be confident in my belief that there's no vast conspiracy going on here, lol.

Seems like you put together a hell of a system.

Kudos.

 

Thanks Sniper!

Now the correction factor and uncorrected charts are posted, yet no more replies, anyone want to "do the math"
Andy

 

(462-279)/7.5=24.4rwhp per psi boost

24.4/279 = 8.7% of pre SC HP per PSI boost. It's really not that huge a gain. There is another Mfgr that sells kits for the 928 that claimed something like 10% HP per psi boost.
Sure is lonely over here
Andy

 

Corky Bell

Corky Bell Born in Albuquerque and raised somewhere between Illinois, Florida, Louisiana, Texas, New Mexico, and Europe, he received a degree in mechanical engineering from Texas A&M. The author worked as an engineer at Bell Helicopter for twelve years. In 1977, he opened Cartech Racing in Dallas after his interest in turbocharging grew from a hobby into a business. He subsequently moved Cartech Racing to San Antonio and in 1992 formed Bell Engineering to expand the scope of business by providing engineering and fabrication services for light aircraft.
For sixteen years he enjoyed the wonderful opportunity to play amateur auto racer (SCCA and IMSA), which left him with lots of hard-earned automotive experience, many fond memories, and many good friends.
Married for twenty-seven years, with two daughters, he lives with his family in the great Texas hill country north of San Antonio (Texas).

 

One significant factor that no one seems to consider when they attempt to compute how my kit will behave at Xpsi is the significant changes to the manifold. As I have mentioned before, the stock manifold has over 1000 degrees of bends. Actually more for some setups. As per Corky Bell each 90 degree bend post SC will cause a 1% flow loss. That means that with using the stock manifold there is around 11% flow loss post SC. This flow loss means that that the SC that is blowing through the stock manifold has to work harder than an SC that is blowing through a manifold such as mine that has only 300degrees of bends for th intercooled version and 135 degreed of bends for the non ICed version. Since my manifolds should, acording to Corky's premise, have 7% or 8.65% (depending on version of my manifold) less flow loss than the stock manifold this clearly means that the VE of the SCed engine beyond the SC is different for a car that uses a stock manifold than a car with my manifold.
SO with a significant change to the manifold you can't just use the VE of the engine in it's stock form to figure how it should behave when boost is added.
I guess one test I could do is to remove the SC and dyno the car with the manifold I use, then dyno the car with the SC in place. This would probably help clear some things up. That's a lot of work and time though.

And note this is only for engines with positive manifold pressure. I couldn't imagine that my manifold would perform better than the stock manifold in NA form. Just because something allows itself to get blown through well dosen't mean it will allow it's self to get sucked through well.
Andy

 

Coming from a guru that gives me some confidence in the way ive approached things. Thanks...seriously.

The only curve ball in this is that those pistons are still stored away in a box in the attic...along with the stroker crank. The engine im using now is BONE stock, 153k miles with a great leakdown. I just added the blower. IMHO, my SC is currently being choked on both ends right now...intake and exhaust. Both will be adressed this fall when it gets cool enough to work in the garage.
Funny, people store there cars for the winters and put projects aside....in Vegas, i do that in the summer months!

 

It would be nice if someone did some volumetric efficiency tests on bone stock 928 engines of all sizes.

That would take a lot of the guess work out of things.