Why does the 95 355 have more horsepower?

Isn't this backwards? Shouldn't they increase horsepower after the 1st production year?

 

Is this a rhetorical question?

 

a chnage in the systems that monitor te cars. in 95, cars were held to a different standard. look at the changes reuired as cars advanced and you will see why there is a difference. for example, f50's are all 95 models. they couldn't mee t the standards of 96 on.

 

I think it has something to do with '95 cars being OBD I and the newer cars being OBD II which had more restrictive emissions standards.

 

?
I was reading up on the 355, in 1995 the horsepower is greater than in the 96-99 . Is this true? If so why?
Is it rhetorical? I don't really understand the definition of rhetorical to answer your question

 

Look at the way the air boxes are set up on each.
Mark is correct. '96's are OBD II and '95's aren't.

'95's have dual computers, dual sensors, etc...


'95
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'96
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The 95 does have more power than later models. They changed to a different fuel inj system and went from OBD1 to full OBD2 (More smog junk).
The real pro's can fill in the details as this is just the jist of it.

 

The air intake on the '95's are the air ducts just aft of the small side windows.

The air intake on the '96's are the ducts in the door.

I'm pretty sure all these things play a roll in the '95 having more horsepower.
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95s had individual throttle bodies for each cylinder

 

The book I have just shows the first year model of each car which shows the '94 355's with 380 hp. How much horsepower do the '96 models have?

I was just riding in both of the 355s above last Saturday and I can tell you for sure, that the '95 felt like it was pulling harder. We never ran them head to head, but the '95 did fell stronger to me.

 

...good info.

 

Mike

Super photo of the red 355. You capture the beautiful 355 shape perfectly.

 

Thank you!

 

I guess english is a second language for some?

 

Neither OBDI nor ODBII are emissions standards.

 

The official (European) figures never changed - 380 bhp.

Now the '95 cars were much quicker BUT many complained about the outrageous fuel consumption AND the Bosch Motronic on the '95 cars would not have passed later emissions tests. The big change came from the arrival in '96 of a new Motronic. Fuel consumption did improve and Ferrari modified the sound of the car. In fact the '95 cars with standard exhausts did not make a very pleasant noise, so as a method of "disguising" power loss (I think it was more a loss of torque than power by the way, as the published figures for bhp were the same and those have to meet EU testing standards), Ferrari gave the '96 cars a sweeter sounding exhaust system! Clever, no?!

 

Mike are you sure about the air intake on the 355 changing from the doors to the windows? First time I've heard that.

OBD simply means 'on board diagnostics'.

 

That's what the owners were telling me, but I didn't take the cars apart to make sure.
Both of the owners I was with that day work on their cars themselves, so they should know what they are talking about. Both of them have taken all that stuff apart and then put it back together.

 

5 less.

10 years on there's probably much greater car-to-car variation than ever existed between the a new 95 and later.

 

Sorry, I don't follow what you are saying.

 

In the pictures above. I think the 95 is faster because it is red. Blue cannot be faster than red, no matter what obd, pcm, naacp it has.

 

From what I was told, they actually were near the windows first and then they changed it to the doors on the '96 models.

To the best of my knowledge, the 348s functional intakes are located near the windows also. Just look at the 348/Enzo prototype. http://img84.imageshack.us/my.php?image=m3a3mm.jpg
http://img480.imageshack.us/my.php?image=m3c1ph.jpg

Where did you think the functional intakes were located?

 

All 355's have individual throttles.

 

Very, very true but there was more difference between the fast ones and the slow ones in any given year than there was between a 95 and a 96,97,98,99, even when new.

The difference in HP according to Ferrari was for one reason and one reason only and that was the extra flow capacity of the 2 air flow meters on the 95 as opposed to the single slightly larger, single air flow meter on the 5.2 motronic cars.

There was one reason and one reason only for the change from the earlier 2.7 motronic to 5.2 motronic. It was done in response to a change in law that required OBD2 and 2.7 was not OBD2 compliant, 5.2 was. 2.7 had been in use since 90 in the 348/ Mond t and the 512TR. It was a very reliable, good system and was not abandoned by choice.