2007 350z speculations?
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Originally Posted by BluZee
I was just reading the new Motor Trend about the 07 G35. It said that they have a 3.69:1 final drive for both the 5AT and 6MT models. I wonder how that will translate to the 07 Z.
Thoughts?
Thoughts?
when you rev the engine higher, a side benefit is that you can have a higher theoretical top speed. 160mph was probably enough for nissan though, so they raised the f/d and took the hit from whatever the top speed would have been (175?) to make it 160, so they could benefit from added torque across the entire curve.
i cant see them doing anything different for the z. the new VQ35HR should be a nice engine to mod....dollar for dollar, the z may even keep pace with the 335i...
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"so they could benefit from added torque across the entire curve."
technically, the final drive has nothing to do with an engine's "curve" at all. by raising the final drive, increased acceleration will benefit, as well as the ability to keep it at higher rpm's on a track. however, the engine remains unchanged.
technically, the final drive has nothing to do with an engine's "curve" at all. by raising the final drive, increased acceleration will benefit, as well as the ability to keep it at higher rpm's on a track. however, the engine remains unchanged.
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Originally Posted by tekk
when you rev the engine higher, a side benefit is that you can have a higher theoretical top speed. 160mph was probably enough for nissan though, so they raised the f/d and took the hit from whatever the top speed would have been (175?) to make it 160, so they could benefit from added torque across the entire curve.
Think of it this way would you rather have a Z that pulls just as hard as the current one only longer, or would you rather have a Z that pulls just as long only harder.
7500 / 6600 = 1.136
we could gear the car ~14% shorter and still shift at the same speed.
3.79*3.56 = 13.4924 current 1st gearing ratio
13.4924 * 1.136 = 15.3273664 theoretical new 1st gearing ratio
287/274 vs 306/270
274 ft/lbs * 13.4924 = 3696.91 rwft/lbs
270 ft/lbs * 15.3274 = 4138.39 rwft/lbs (and a flatter curve)
#286
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its rated at 306/270 on the new HP system correct? but if we used the old system, then it would be about 5-7hp/tq higher? at least thats how I see it
so the current Z is running at 300hp on the old system...the new vq35hr Z would run maybe 312hp on the old system? 12hp increase....ehh, you guys think nissan would bump it up a lil more when they release it for the Z? 12hp don't sound much especially for 80% new internals....i was hoping for 20 (this is all under the old hp system)
so the current Z is running at 300hp on the old system...the new vq35hr Z would run maybe 312hp on the old system? 12hp increase....ehh, you guys think nissan would bump it up a lil more when they release it for the Z? 12hp don't sound much especially for 80% new internals....i was hoping for 20 (this is all under the old hp system)
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Originally Posted by clarkkent06
"so they could benefit from added torque across the entire curve."
technically, the final drive has nothing to do with an engine's "curve" at all. by raising the final drive, increased acceleration will benefit, as well as the ability to keep it at higher rpm's on a track. however, the engine remains unchanged.
technically, the final drive has nothing to do with an engine's "curve" at all. by raising the final drive, increased acceleration will benefit, as well as the ability to keep it at higher rpm's on a track. however, the engine remains unchanged.
Originally Posted by bghoward
the higher redline won't affect top speed, remember the Z is already geared for 190+mph, in fact going with a 3.9FD will actually give the Z a higher top speed because it is drag limited and the extra gearing gives it a little more oomph at those speeds. The biggest benefit to higher redline is take better advantage of it through gearing.
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Originally Posted by steven88
its rated at 306/270 on the new HP system correct? but if we used the old system, then it would be about 5-7hp/tq higher? at least thats how I see it
so the current Z is running at 300hp on the old system...the new vq35hr Z would run maybe 312hp on the old system? 12hp increase....ehh, you guys think nissan would bump it up a lil more when they release it for the Z? 12hp don't sound much especially for 80% new internals....i was hoping for 20 (this is all under the old hp system)
so the current Z is running at 300hp on the old system...the new vq35hr Z would run maybe 312hp on the old system? 12hp increase....ehh, you guys think nissan would bump it up a lil more when they release it for the Z? 12hp don't sound much especially for 80% new internals....i was hoping for 20 (this is all under the old hp system)
udner the newer standard, the nonrevup engine is ~275hp and the revup engine is ~293hp. the new engine is now ~306hp. The power increase and curve/gearing changes should be more significant than the 12hp difference suggests though.
look at it this way: the G35 sedan went from doing the 1/4mi in about 14.6@98mph to about 13.9 sec @ 103mph. That's a big change.
Now think, they're putting that engine in the Z next...
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Originally Posted by tekk
I have an 04 G coupe 6MT. My car doesn't appear to be geared for 190+mph. I think I'd hit redline in 6th at 160mph. The only way I could see myself going faster is if I had more rpms and more power to use those extra rpms. I agree with you regarding gearing & redlines...
the sidewall is roughly 4.41 inches
4.41 + 18 + 4.41 = 26.82 inches diameter
circumference = PI * D = 26.82 * 3.14 = 84.26 inches
6th gear is 0.794 and the FD is 3.538 = ~2.81 final ratio
6600rpms / 2.81 = 2348.75 wheel rpms at redline in 6th gear
2348.75 wrpms * 84.26 inches = 197,906.05 inches/minute
197,906.05 / 12 inches = 16492.17 feet / 5280 = 3.124 miles/minute
3.124 miles/minute * 60minutes = ~187.41 mph
12hp don't sound much especially for 80% new internals....i was hoping for 20 (this is all under the old hp system)
Well with the new true dual symmetrical intake, symmetrical exhaust, strengthed block, better cooling, higher revs, better friction management, etc-- I have news for you, those things weren't developed for the G35 sedan, they are just trickle down R&D...
Also like I said earlier in this thread the 306hp IS350 is putting down 260-265rwhp with an automatic. The new SAE system should reduce mfgr to mfgr horsepower discrepencies, so I would estimate at least 265-275rwhp for the new engine with the 6MT.
From what I have seen the old G35 sedan would put down about 225rwhp so 14.6@98mph to 13.9 sec @103 quoted earlier is about right for 40-50 rwhp.
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forgot to mention, the rev-up Z/G would top out around 198mph in 6th gear. Remember 6th gear is not designed for achieving the cars top speed, it was designed to give it a reasonable bragging top speed and still get good mpg in cruising. Would you trade cruising 4000rpms@60mph for an extra 10mph top speed? I drive at 60-70mph all the time, I don't go 160+mph very often.
#291
Originally Posted by bghoward
forgot to mention, the rev-up Z/G would top out around 198mph in 6th gear. Remember 6th gear is not designed for achieving the cars top speed, it was designed to give it a reasonable bragging top speed and still get good mpg in cruising. Would you trade cruising 4000rpms@60mph for an extra 10mph top speed? I drive at 60-70mph all the time, I don't go 160+mph very often.
your thinking is off the higher the rpms @ 60 the lower the top speed is going to be.....
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Originally Posted by teknochild
your thinking is off the higher the rpms @ 60 the lower the top speed is going to be.....
In theory taller gearing allows you to achieve higher top speeds and will allow a lower cruising rpm. however the Z is never going to achieve 190+mph it is geared much too tall and doesn't have enough power to overcome about 160mph with stock gearing. My point is that if nissan had geared the Z for a theoretical top speed of 175 instead of 190, the car would actually have a little more oomph from the additional mulitplication of gearing and would more than likely achieve a higher top speed.
Think of it this way, if I wanted to acheive the maximium mph why would I gear my car so that in top gear I can only hit around 5500rpms or so before becoming drag limited? I wouldn't be using the full potential of my powerband. I would want to gear the car so that the car is drag limited at it's redline of 6600 rpms.
I have heard that getting the shorter 3.9FD gear actually *increases* the achievable top speed even though the theoretical top speed decreases.
#293
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Response.jp is reporting the VQ35HR is confirmed at 315PS!
japanese article (if anyone can translate for us)
http://response.jp/issue/2006/0830/article85413_1.html
http://translate.google.com/translat...l%3Den%26lr%3D
japanese article (if anyone can translate for us)
http://response.jp/issue/2006/0830/article85413_1.html
http://translate.google.com/translat...l%3Den%26lr%3D
Last edited by **; 08-30-2006 at 05:40 PM.
#294
For the lazy.
The nissan VQ engine new model article summary
The nissan VQ engine new model output 315PS
The Nissan Motor Co., Ltd. technical announcement did on the 22nd, the new “VQ” serial V6 engine. The fact that first it is loaded is the next term 'skyline which is announced to the fall'. If you mention “the skyline”, in the Japanese market whatever saying, the image of the sport sedan is strong.
2006 August 30th
Reflection to the NISSAN VQ engine new model type designation
Keeping the Nissan Motor Co., Ltd., full the new model V6 engine “VQ35HR” which it appears (3.5 liters in aerodynamic volume displacement), “VQ25HR” (2.5 liters in aerodynamic volume displacement). But very type the same as the current 'skyline' on-board machine VQ, in fact another engine is the NISSAN insistence.
2006 August 29th
Block
As for the NISSAN VQ engine new model 0-100km/h acceleration a little more than 1 seconds shortening
The Nissan Motor Co., Ltd. 22 days the new generation V type 6 cylinder engine “VQ35HR” which is announced (3.5 liters) with “VQ25HR” (2.5 liters), continual variable valve timing mechanism to inhalation and exhalation of air both sides (CVTC) raised largely with the improvement of advancement and the friction and pumping loss etc of control of the combustion with adoption, output and fuel economy efficiency in comparison with old type.
2006 August 22nd
The nissan VQ engine new model article summary
The nissan VQ engine new model output 315PS
The Nissan Motor Co., Ltd. technical announcement did on the 22nd, the new “VQ” serial V6 engine. The fact that first it is loaded is the next term 'skyline which is announced to the fall'. If you mention “the skyline”, in the Japanese market whatever saying, the image of the sport sedan is strong.
2006 August 30th
Reflection to the NISSAN VQ engine new model type designation
Keeping the Nissan Motor Co., Ltd., full the new model V6 engine “VQ35HR” which it appears (3.5 liters in aerodynamic volume displacement), “VQ25HR” (2.5 liters in aerodynamic volume displacement). But very type the same as the current 'skyline' on-board machine VQ, in fact another engine is the NISSAN insistence.
2006 August 29th
Block
As for the NISSAN VQ engine new model 0-100km/h acceleration a little more than 1 seconds shortening
The Nissan Motor Co., Ltd. 22 days the new generation V type 6 cylinder engine “VQ35HR” which is announced (3.5 liters) with “VQ25HR” (2.5 liters), continual variable valve timing mechanism to inhalation and exhalation of air both sides (CVTC) raised largely with the improvement of advancement and the friction and pumping loss etc of control of the combustion with adoption, output and fuel economy efficiency in comparison with old type.
2006 August 22nd
#296
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Originally Posted by n8236
My question is, what do they mean by 0-100 km/h acceleration a little more than 1 second shortening?
#297
Originally Posted by krismax
0-62mph 1 second faster example if old did 6 now it does 5