The Dyno Page
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We tried to document Baby's progress every step of the way. The dyno shop we used initially was Cyntex Racing of West Chester, PA.
The initial run at Cyntex Racing was with Baby's normally aspirated motor having the
Dinan CAI
Dinan MAF
Dinan Stage 4 software
OEM ZF5HP24 automatic transmission
The results were:
222 hp @ 5750 rpm
243 ft lbs @ 4250 rpm
The second dyno run was done at Cyntex Racing after VAC Motorsports ported & polished the heads. The flow data we logged was encouraging with 152 cfm @ .500 valve "stock" which increased to 170 cfm @ .500 valve after porting.
The results were disappointing with a reduction in power putput evident.
216 hp @ 5750 rpm
239 ft lbs @ 3750 rpm
We believe this was due to ECU mapping issues. At this time the decision to supercharge Baby was in the works and therefore we made no effort to re-do the ECU mapping. Nevertheless the dyno run underscores the importance of proper ECU mapping.
The third dyno run was again at Cyntex Racing and was conducted to detect differences in performance between cars having automatic transmissions and similar cars having manual transmissions. At this point VAC Motorsports had completed the conversion from automatic to 6-speed manual.
The results indicated an increase of
16 hp & 16 ft lbs of torque which we believe represent the difference in the parasitic power losses between the automatic and manual drivetrains. I wonder what the readings would have been had the vehicle weight entered at set-up been 4250 lbs as in the first 2 tests instead of 4500 lbs. In any case we discovered Found Horsepower!
The One Lap of America was upon us and a final dyno run at Cyntex Racing was delayed until June 22. The run was conducted at a Charity Dyno Day hosted by Cyntex Racing on behalf of the Riesentoter Region Chapter of the Porsche Club of America.
We expected better results with a 7 lb boost supercharger in place. Closer examination of the data reveals the vehicle weight may have been set even higher {4,700 lbs} than the previous runs and the weather was certainly warmer that day with ambient air temperatures in the 90s.
The final Dyno Run was conducted at Curry's Automotive in Sterling VA. on July 13, 2002. Although the results were impressive, the test left me with more questions than answers. Curry's did a full spectrum of analysis by including boost curve, boost curve sampling data, as well as the traditional horsepower curve testing. I want to say thanks to the folks at Curry's for taking the time to answer my many questions.
355 hp @ 6000 rpm
334 ft. lbs torque @ 4750 rpm
Power x RPM Trace
Power X Time Trace
Boost Curve Data
The data from Curry's falls where we expected power levels to be and happily were in accordance with the ESS advertised power yields. Currently, we are exploring aftercooling systems and future dyno runs are anticipated as progress on Baby continues. Stay tuned!
VAC Motorsports.....
When you are serious!
