I've got an appt. for 10:30 AM on Thursday.[/b]
Sweet man, look forward to the results!
I've got an appt. for 10:30 AM on Thursday.[/b]
On this dyno. On another dyno, like MAC's highly overinflated Dynojet (which uses a full/NA correction factor on all cars), Speed6's only lose about 40-50hp through drivetrain loss. Other dynos, like the the Dyno Dynamics over at Super-Rupair have put down numbers in between both of them.
Stock STI on MAC's dyno= 260-280whp.
Stock STI on RP's dyno= 205-225whp.
Stock STI on Super-Rupair's dyno= 210-245whp.[/b]
There is no difference, we have the same dyno. Dynos are a tool to measure with. I'm sure my partner no coast punk will be happy to explain why it is different to tune on a dyno dynamics vs. a dynojet some time[/b]

Why the diff between the DD at RP and Super-Rupair?[/b]
Oh, I knew that...I was just wondering if Brandon knew that the dynos at the 2 shops were the same.[/b]
Harvey's numbers are usually within a few % of ours high or low. There are so many variables that come into play when talking dyno's. Gas, tires, engine wear, oil type, wheel weight, etc. can all change numbers.
I don't doubt that he has seen 245 on a stock STi. There are a few factory freaks running around... and many other factors that can come into play. For all Harvey knows that 245 car could have been flashed by a previous owner without him knowing. Or the car could have been filled with some freak gas (the 91 number you see printed on the pump is an average).
Don't forget manufacturing tolerances. As a good example. BMW makes a very rare series of their M cars with a special CSL badge. As part of that CSL package you get an engine that is GUARANTEED and TESTED to make within 5% of the rated factory power. You pay an enormous premium for that CSL engine. On your typical M motor that can be anywhere from 15->25 hp more or less than the rated output. I have yet to see any concrete numbers on how far typical factory engines deviate from their rated power... but I would be willing to be a hell of a lot more than 5% considering the lengths that BMW goes through to hit that 5% window.
Bottom line is that the numbers that come off a dyno are just numbers. The numbers don't really mean much.
We consider our dyno to be a VERY expensive torque wrench. It is a fantastic tool for rooting out positive or negative changes on a car. Anything beyond that... and people read too much into numbers.
Our dyno could read 200hp too high or low for all I care. As long as it measures differences in power as accurately as it currently does... it would be just as useful for 90% of what we use it for. FWIW I can accurately gauge the power gains/losses by tweaking the carb on a pocketbike making less than 2hp. I really do trust the numbers that come off that thing down to about the .1 or .2 hp range.[/b]
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