At first Nissan claimed that the most hp that they were able to get out of this motor is 287 normally aspirated but now i'm seeing that the 2005 Infiniti G35 has 298hp out of this same damn engine. I'm starting to feel really short changed on this issue. How much hp can this engine really put out is my question and someone needs to find out the exact air/fuel mixture and ecm settings that they are using on the higher hp cars such as the 350 and G35. I hope everybody else feels the same way as me. I spent 35K on this car and all I got is 265. Where are the rest of my ponies?

 

In the marketing brochure? As for how much hp it can put out, how much do you want to spend?

 

I was at Infiniti today and I was looking at the 2005 G35 Coupe and the hp rating on it was 298. I was very surprised to see that this motor could put out even more than the 287 in the Z.

 

The big reasons for the HP difference is the intake and exhaust designs.
More air in+more air out= more power!!!

 

the 35th anniversarry edition Z puts out an even 300

 

You knew the hp figures before you bought it. You test drove it before you bought it.

The only person you have to blame is yourself....should have bought something else if hp was that important to you.

 

Check out the torque figures, too ... you'll see they sacrificed a little torque to get the hp number up, and torque is more important to performance than hp in most cases. Most of the people on the G forums figure the performance difference between the '04 engine and the new one will be negligible.

This is a juggling act. With a given displacement, there's only so much hp and torque you can get without introducing new technology like variable-length intake or variable lift valves, etc.). You can increase one of the numbers, but the other one has to go down. The Acura TL is a good example - its 3.2 liter engine is rated at 270hp, but it has measley torque (238 ft-lbs), so the Maxima's 3.5 liter engine pulls stronger in spite of being down 5hp. (Don't start quoting 0-60 or quarter mile times ... that has to do with gearing and weight.)

Point is, Infiniti needed to distance itself from Nissan and Acura (TL at 270hp and the new RL rated at 300hp), so it juggled some numbers.

Mike