Why is the Z so heavy?

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Feb 14, 2005 | 01:39 PM

#41

lunartick13

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Joined: Jun 2003

Posts: 500

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From: Las Vegas

Quote:

Originally posted by nis350ztt
350Z does do high 13's stock. IMO, this how the times should be laid out for normal 350Zs (238-244rwhp stock):
13.6 - Great driver
13.8 - Good driver
14.0 - Decent driver
14.2 - Needs practice

I plan on getting 13.8 - 14.0 while bone stock, will post timeslips and pics, possibly a video.

13.8 that my friend is almost a 14.00, when I think about the Z doing 13.6 or less out of the factory, that would be very nice..

Feb 14, 2005 | 01:45 PM

#42

Brandon@Forged

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Joined: May 2003

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Likes: 1

From: Valdosta, GA

Quote:

Originally posted by lunartick13
13.8 that my friend is almost a 14.00, when I think about the Z doing 13.6 or less out of the factory, that would be very nice..

Feb 14, 2005 | 01:59 PM

#43

Brandon@Forged

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From: Valdosta, GA

Copied to the Performance section.

Feb 14, 2005 | 02:17 PM

#44

kovalf

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Joined: Dec 2003

Posts: 63

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From: Rockville, MD

Quote:

Originally posted by Armitage
Just because it loses PEAK torque doesn't mean anything. Because of the raised redline and higher hp output, it actually makes more tq at a higher RPM than the previous iteratin of the engine did, meaning it has a broader torque band. The engine will propel the car as fast, if slightly not faster, than the normal Z engine.

I'm no physics major, but if (HP x 5252) / RPM = TQ, then:

(300 hp x 5252 RPMs) / 6400 = 246.19 TQ
(287 hp x 5252 RPMs) / 6200 = 243.12 TQ

As you can see, the new engine is making 3 ft-lbs of torque more 200 RPM's higher than the previous engine. Supposedly this difference has led to .1-.2 second differences in lap times around the track, according to some posts about magazine articles testing the new engine. I guess it is only a matter of time before we see if it really holds true.

Most of all, remember peak numbers don't really mean crap; they sell cars. Power under the curve is what determines acceleration and speed. Its very similar to stereo systems. No one cares about peak power ratings; it's all about the RMS (continuous) power that the stereo/amp can put out. That is the number one should be concerned about for performance.

Both the HP and torque vary across the rpm band. We'll probably never know the exact answer without seeing the Hp and torque curves from each engine, but from your equation and knowing that each engine makes its peak torque at 4800 rpm (274 old engine vs. 260 new engine), you can see that the old engine is making more horsepower at 4800 rpm that the new one. Again without seeing the curves we can only speculate, but I would guess that the new engine has a torque (and horsepower) advantage from idle to north of 5000 rpm, but then drops off quicker than the new engine. A car is going to accelerate according to its torque curve (everything else being equal), so I would guess that the old engine would out accelerate the new one up until about 5000 rpm, then the new one would start having an advantage. Now if you're lapping a track and most of the time can keep your revs up, you can benefit from the advantage. But my point was that the old engine had more low end pull to accelerate better, given everything else being equal (such as gearing). So, I believe the old engine has an advantage from a standstill and coming out of low speed corners, not to mention my other point about the approximately 100 lb weight advantage from the base to the anniversary model.