Quote:
Evil997 said:
This weekend I am installing headers and cats to my PSE and Fabspeed cold air kit. Unfortunatly I never dynoed when the car was completley stock, but I plan to before and after tuning.
What numbers have people had on a CS?
Thanls
Mar 7, 2006 10:27:10 PM
Mar 8, 2006 12:20:52 AM
Quote:
devo said:
You may not gain anything. Amongst countless variables, you have to consider how efficient the oem products work. Many times you sacrifice low end h.p. and/or torque for less usable power. Additionally, your exhaust flow is directly connected to the car's intake. (If your using Fabspeed's cold air TUBE, I hope you don't expect much.)
It can be very difficult to find addtional power in today's high performance n/a engines when you limit your mods to exhaust and/or intake. There's a reason that Porsche gains only 26 h.p from their X51 kit, and the kit has substantial mods.
Regarding the dyno, aside from the fact that you didn't obtain a baseline, you may never know what gains or losses you achieved. A lower h.p. car with a spiked powerband will usually FEEL faster than a higher h.p. car with a linear powerband.
Tire pressures, engine temp., ambient temp, different operators, etc.. can affect the results.
Quote:
tinbomber said:A 99 996 made 296HP from a non-egas 3.4L engine. A brand new cayman (using a newer 3.4 than the 996 3.4 had) makes (drum roll) 300HP while using variocam and other high tech features.
Mar 9, 2006 2:56:33 PM
Quote:
devo said:
I disagree. Although, costly and not probable, power measured at the "crankshaft" IS the most accurate, subject to far less error. Any driveline losses will exist regardless of what amount of power is being produced by the engine.
Mar 9, 2006 5:31:55 PM
Mar 9, 2006 7:16:17 PM
Quote:
devo said:
I agree with what you've posted. I meant to say: consistent. I realize that the (RWHP) is the only number we care about. I assumed -from my experiences with motorcycle chassis dynos- that a chassis dyno was more finicky; yielding different numbers from different operators, tire pressures, set up, etc..., thereby, making consistent numbers less likely than those with a crankshaft measurement.
I hope this makes some sense.
Mar 10, 2006 8:45:54 AM
Mar 10, 2006 11:17:38 AM