[Dallas]

Sport compact just finished testing the SER Spec V and they trashed the engine. They said they had tested 4 cars with huge differences in the HP ratings, they also went on to say some of the proto types had counter balance shaft problems, oil consumption problems etc etc. On the Dyno jet
they got 140 hp at the wheels, accounting for drive train loss thats only 160-165 hp at the flywheel.Nissan seems to be misrepresenting the Hp figures on this engine a little bit. Boy Im happy I ordered the V6.

 

[c5hardtop]

Interesting, and probably the reason Nissan lowered the HP ratings a bit. At 15% drivetrain loss, It should be puting 148.75hp to the wheels (18%-143.5hp, 20%-140hp). Nissan is still safe in the ratings for now, one could claim that the engine would make more HP when fully broken in, and its not that "big" of a difference.

I was flamed for saying this before, but there is also the possibilty that the 6-speed manuel may have more of a drivetrain loss than a 5-speed manuel... as it is heavier, has more gears, and thus more friction. Its been the case in other brands.

 

[mrdeucie]

If you were to compare the 1st gen altima to the figures you produced, you would see that the first gen loses at least 20% hp to the flywheel. So 140 for the sentra is not that bad.

 

[02alty driver]

140 is better then 127 in the civic right? wut the hell you complaining about?

 

[bigbird]

Usually the loss is calculated at flat 18% from what the manufacturer claims. Most times that calculation is correct, so was the case when I dynoed my altimas. 18% deviation each time...

 

[Ry]

140 is better then 127 in the civic right? wut the hell you complaining about?

but still... nissan needs to bring that number up. the SE-R and SE-R spec V must be competitive with the new Si, the SVT focus, etc... we all know it's better than a lower civic.

 

[Afty]

Someone on the SE-R list claims to have dynoed a production Spec-V, and he got 150 hp to the wheels. Not sure how trustworthy the source is since I'm not a regular on the list, but others claim the guy is very trustworthy.

There's a discussion on this over at FreshAlloy.

 

[dennis]

Alty 02 HP

For the average user like me (who does not understand all this talk about HP at the wheel and HP at the transmission) what does it mean from a practical standpoint?

I am thinking about getting the Alty 02 2.5S and wonder about all this talk of misleading advertising in HP. Nissan's brochure claims the 2.5 has 175 HP at 6000 rpm. Do all these threads mean we are getting less? I would appreciate if someone can clarify this for the average layman. Thanks.

 

[Perfect Nissan]

Basically, you are not getting as much hp to the wheels(what really counts) that they claim. But then again, most companies rate their cars at the flywheel or whatever. So, it isnt really that big of a deal

 

[MikeS.93Maxima]

Nope...its not an issue dennis. See, when ANY manufactuer rates an engine's hp, they tell you what the engine makes, 175hp in this case. The power that gets to the pavement is ALWAYS less...in EVERY car. Its called drivetrain loss. This is the power robbed by manual and automatic trans(more loss with an auto). Rest assured, you're getting a 175hp altima.

Mike S.