Ferrari F355 Dyno's 313.8rwhp/225rwtq

Man I love that sound.....

 

I'm not sure I understand what the hubbub is all about. A front-engined, RWD car will show a ~18-22% drivetrain loss, while a mid-engined, RWD car will show a ~15-19% drivetrain loss. That would put a 375bhp, mid-engined car at around 304-319rwhp.

So, I would say 313rwhp seems right in line.

 

Dyno dynamics. 3 different 355s with 4 different exhausts, btw. Just goes to show, dynos are just a number! You can calibrate them to read what you want.

 

Who cares? My car is pretty FAST! The way I like it. May not take a muscle car off the line but they can watch my tail lights fade into the distance as we progress.

 

So, what exactly is the issue here? Why is this thread two pages long, and why isn't it in the technical Q/A section?

 

I see; I guess I was reading more into a few of the posts than I should've.

That's an odd thing to say...

 

I have always know that also Brian. Do you know the particulars behind that? is it mainly software tuning in the ECU(S) to meet our smog regs. Its seems the hardware pistons, cams etc. are the same. My question is based on the 355s

 

This was true at one time when the emission standards were stricter in the US. However, within the last 10 years or so, the standards have become similar and US and European cars have the same compression ratios, cam timing and horsepower. The only difference in horsepower relates to the measurement base, SAE net vs. DIN.

 

Wrong.

The motors have big signs on them when they are on dollies at the factory that say "USA". The factory dyno report sitting on my desk say's " MOTORE USA MY2000 F1 F131B.010.


It goes on to say it made 373 HP (368 SAE) at 8500 and 37.3 (270 Lbs.) KGM at 4750.

I can also tell you that having driven USA and base model 360's and 550's back to back there is a considerable performance difference.

 

There was an interesting post here about later model US spec 550's having a small catalyst in the exhaust manifold, which is not a feature of European spec cars. If correct, this would certainly have an effect on the performance of US spec cars and is a good example of why more than cam, compression and capacity have a bearing on power outputs.

 

I know that the ECU'S are different as to the other specifications I don't know. I do know cam timing is the same. A US and a base model 355 are not that different in performance so I suspect the specifications are not drastically different.

Ferrari often did not tell us that there were or what the differences were unless it was required for us to do the job, something like cam timing. I do know of many cases where we were specifically told there no differences when in fact there were. Often the only way to know is to look in the parts book.

We were not told for example that starting in 2000 the cars came with a precat located in the exhaust collector of the cars, all we knew is that all of the sudden the cars were not as fast.

I do know that a base version 360 and a US 360 feels like 2 different cars. And when you start removing access panels it looks like 2 different cars.

I also know when you start fooling with cam timing they start coming alive.

 

Brian, by this are you suggesting that there are benefits to be obtained by performing cam changes in these later models (355 ->)? If so, do you have any specific details?

Thanks, Dave

 

That flat spot around 6krpm is very evident when driving. And I thought it was all in my mind!

Dave

 

You could get a mod like this and eliminate that flat spot.
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I just ran through this thread and didn't notice the dyno results with the new manifolds, was that ever posted?

Thanks!
Michael

 

The ECU's are different, the exhaust is different. As for the Internals, I believe they are the same. And besides it wouldn't be cost effective for Ferrari to produce two totally different engines for two different markets, they just tweak them.

And you are 100% right in saying driving a Euro 360 and a US 360 feels like two different cars. The euro cars always seem to have more "whoa" in the S.O.T.P dyno.

 

Hello.

I want to ask you something and i am very sorry if I do not do it in the right thread. I saw that the 6th gear of a manual F355 gives 20.8 mph/ 1000 rpm . So if you reach the top speed of real 183 mph you have to be in 8798 rpm . I want to ask if the rpm limit is so high. I thought that the factory rpm limit is 8500 rpm!!!