Here are my dyno results, made in a TCS Center in Bern / Switzerland. My car is a 2003 Coupé GT with a Tubi and BMC filter. The car have 65000 km. The filter is probably dirty because I must take the car for a service in 5000 km... Other caracteristics are on the chart. Results (values are normalised using euro standards EWG 80/1269) : Power : 408.6 hp (300.5 kW) at 7345 rpm Torque : 314.9 ft/lbs (426.9 Nm) at 5880 rpm The dyno graph : http://www.lioneljaquet.com/galerie/albums/userpics/10001/maseratidynoft1.jpg The video : http://www.lioneljaquet.com/famille/dyno.wmv The surprise of the day is the torque curve : look at the graph !
Look at the print carefully, that is not at the wheels, it is at the cranck, normalized using the atmospheric figures...
That's using a very generous correction factor to get to 408 hp. Any other car dynoing at 315whp with a manual tranny would be a 370 hp car.
The values are normalised using euro standards EWG 80/1269. If I use the SAE J1349 standard (more common with dynojet), I get 410 hp. More info there, with online calculators: http://wahiduddin.net/calc/cf.htm
Well, here is my dyno chart. This is supposedly HP at the wheels (382.5HP at 7500 rpm in 5th gear). We had some trouble getting the car to behave (overheating, getting the car to accept the front wheels were not spinning while the rear wheels were screaming, etc...), but run 2 seemed clean. This translates to something like 420HP at the flywheel, I would expect, which would be pretty good. The factory spec is 390 HP, which I assume is at the flywheel, and also without all the US pollution stuff. My car has the Eurotek ECU upgrade, straight pipes instead of rear mufflers, and BMC airfilter. Also lowered, but that shouldn't make a difference on these numbers. Thoughts? MikeA Image Unavailable, Please Login
I think the chart probably shows HP at the flywheel, since 382.5 actual is pretty close to the factory spec of 390, which I am sure is taken under optimal conditions like no Calif emissions stuff, higher octane fuel, etc... This translates to something like 355.5HP at the wheels. Make sense? Mike
Jack, Here's the dyno graph of our 2002 Spyder, taken when the car was totally stock (original ECU software, no Tubi's). The dyno operator assumed a 16% correction factor that is typical for manual gearbox cars. If that assumption is proper, ours made about 399HP at the crank. BTW, the Tubi increased RWHP by about 15, but the Maserati 2004 ECU software update killed every bit of the increase and more. I never did find out why... Notable features from my dyno graph: - Obviously, there was some problem at lower RPMs causing 'squigglies' - Wonderful flat torque line makes this a great engine with lots of usable power! Brad
Which gear do you use ? the squiegglies are strange... for the ECU problem you can change for an Eurotek (http://www.eurotekdesigns.com/main.html) but in my opinion 15 hp = less than 4% of total power... so don't care ! Fun is the unique goal !
Jack Here in the US we're not all up on the "euro normalization standards'...being from Europe myself I find that a bit of contradiction to begin with..hopefully you appreciate the joke....LOL My question is this, when Maserati advertises 390-400Hp for their motors in sales materials, does your experience indicate that it is conservative of optimistic in terms of what the cars really make on the dyno?
Using the temp and pressure listed on the dyno sheet I get a correction factor of 1.067 which would make it 336RWHP, and with a 15% drivetrain loss, that would be around 395hp. I find conversions back to BHP to be mostly irrelevant because its very difficult to come up with a concrete figure and its the RWHP that moves the car anyway and hence all that matters. Either way, it sounds fun and fun is all that matters!
I think the dyno operator used used 5th gear, but I'm not certain of that. When my Corvette gets dynoed, the operator uses fourth (of 6). After the software update, there was a pretty dramatic character change to the car. The dyno dropped from 335 stock to 316 RWHP with the Tubi's mounted (they had provided about 17 RWHP with the original ECU). Overall, I think I lost about 10% of the original configuration's power. Car's still fun, but not quite as much...
