Hello Brotherhood I bought my 348 GTB a few months ago It came with a dyno graph from the PO The max power output on that is 307HP@7000rpm and the Max torque is 335Nm@5100rpm The PO claims these are rear wheel measurements I wonder how much this would mean at the cranck I also doubt that the engine could be that powerful since the 119H delivers 320HP and 324Nm according to the manual The car has a 'sports' exhaust, brand unknown No idea if it is chipped either Any ideas?
http://www.atsracing.net/1994_ferrari_348.htm http://www.dragtimes.com/1993-Ferrari-348-Dyno-Results-Graphs-11832.html http://www.vr6oc.com/events/RR/powerstation/251106/K521KHK.pdf try these links to dyno sheets .... cheers hf
Egad, more dyno numbers of dubious origin... Different dyno machines produce different results and even the same machine produces different results in different conditions, which the machine tries to correct. There is no real dyno test, short of pulling the engine and putting it on a laboratory test machine, that will give you a realistic picture of crank output. Only use these wheel measurement data as benchmarks for comparison tests on your car as you make modifications. Absolute numbers mean little. For example, my car shows 256 Hp at the wheels after modifications on a Dynojet. It was 245 before; that is all that matters. The "adjustment" shows the engine produces 330 crank Hp. Right, sure thing...
Here are two dyno printers of my old engine for comparison. First one was done on a hub dyno and after modifications. Second one was on a rolling road before any mod. Image Unavailable, Please Login Image Unavailable, Please Login
The green line on angelis chart is about what one would expect on a rolling road dyno {220-245 HP}. Most fo the 355s end up dynoing in the 290-310 range on similar rolling wheel dyno {in proper tune}. Note: both cars display "about" 60-80 HP loss through the complicated (low CoG) transmission and drive line. This is to be expected, the minimum numbr of ears that are used to carry the power is 4 {drop, 90 degree, ratio, differential}; compared to typical Americal drive lines that go through as few as 1 pair of gears.
Thanks guys At least I am sure the output is at the crank Also learned that there is a lot of tolerance on the measurement depending of correction factor for drive train losses, atmospheric conditions, type of equipmnet , etc Just need to find out how to convert from ftlbs to Nm Frank
