Dyno Day pics

Hi Everyone,

Sponsored a Dyno Day yesterday here in New England (USA). Pics are at http://www.enjoythemusic.com/dynoday0504/ . Interesting numbers at the wheel.

Enjoy the Drive,

Steven R. Rochlin

I was wondering why the Lambo only made 360rwhp, but then i noticed it was on 4 wheel dyno. Either way, the figures are all lower than ive seen for all the cars.

Which car was making 738?

Thats wrong. The TR was making 270.

As you know, different dyno machine types can rate differently. The numbers are "low" due to NOT accounting for the 15-20% or so drive train loss. The numbers from the dyno are "at the wheel." If you want EXACT numbers for ENGINE, that usually requires taking the engine out of the car and hooking it to the proper rig to test it.

Sorry Allan, the 550 beat the Lambo here... but not by much. Besides, we all realize some ricers have cars with MUCH MORE HP... but how would these same cars perform on a proper track? Ahhh... we all know there is more to life than just HP/Torque numbers.

Enjoy the Drive,

Steven R. Rochlin

Steven, you cannot compare dyno numbers between a rear drive only and a 4wheel drive dyno. The 4 wheel robs gobs of power on the dyno. Diablo Vts with the driveshaft disconnected consistently put down 425-450 Wheel Hp. In this compro, it shows just how down on power the 550 really is.

As for my comment on the all the numbers being low, this is in regards to the Wheel hp figures, not flyweel hp.

Maybe someone can help a new 308 owner out.
I noticed that both 308s seemed to peak on HP at less than 7000 RPM. The Ferrari website says that this thing develops peak HP at 7700 (which is disappointing to me). What's the scoop?
I haven't been venturing up there a whole lot yet... she's going up on the jackstands tonite!
Thanks,
Don

On my '78 308 GTS the REDLINE is 7700 RPM. That is the manufactures recommendation of the maximum the engine should be run at. This does NOT necessarily reflect where the engine produces maximum horse power. This holds true on nearly every engine I have run with the exception of certain motorcyle engines.

After running my car on a dyno last month I found peak horse power at about 6500 to 6800 RPM. If you read the specifications for an engine carefully you may find peak horse power figures listed at less than redline in most cases.

Here is a link to the dyno sheet for my car.

http://www.ferrariforum.net/forum/download.php?id=1371

Please note; this was done on a WinPEP inertial dyno (2 wheel drive only)

Hope this clarifies things a bit.

<sigh>
Another Ferrari discussion forum I have to register for! So I can't get to that sheet (yet!)
So what I should take from all of this is that the data on the Ferrari website for the 308 is incorrect and it does NOT develop peak HP at 7700 RPM. I'm aware that 7700 is also the redline and that it's uncommon to make peak HP at redline.
So is there definitive data on the RPM for peak HP/torque? I notice that both cars tested in the original link have drastically different torque curves.
Thanks, just trying to figure these things out, and I'm a numbers kinda guy!

Sorry about the link. I can't post the graph from my own data base because I am at work. I will try sometime this weekend.

Which 'Ferrari' website are you referring to? Are they measuring the HP on an engine dyno (at the flywheel) or a chassis dyno (at the rear wheel)?

It was explained to me in a thread on the 'Forum' site that per Newton's Law the HP curve and the Torque curve cross each other at 5252 RPM's (imperial units) on ALL engines but the max of each will NOT occur at the same time.

Here is a link to that discussion;


All new stuff to me.