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Rating the 3.5 liter

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Old 06-04-2004, 08:37 AM
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Rating the 3.5 liter

Okay, now I know many manufacturers use the same engine in different vehicles but NONE come anywhere CLOSE to how many Nissan uses the 3.5 liter V6 for. For good reason, it's a great engine.

But, I've brought this up before and this time I need to know...WHAT'S UP WITH HOW THEY RATE THE POWER??

I believe the 3.5 was first seen in the Pathfinders. It was rated two ways:
If you bought a manual you got 240 hp, but if you bought an automatic you got 250 hp. The torque figures were even more skewed. Huh? How exactly does the manual or automatic effect the hp rating at the crank??

But in the Murano, it's rated at the same 240 hp and 246 tq with a CVT tranny?

Then the 3.5 liter was first seen in a car in the 2002 Maxima.
Rated at: 255 hp and 246 tq

Then in the 2002 Nissan Altima
Rated at: 240 hp and 246 tq

This was corny enough to say one has 15 more hp but no more torque?

Then the 2003 they dropped the engine in the Infiniti G35 sedan.
Rated at 260 hp and 260 tq

Then of course their was the G35 Coupe and 350Z each with higher horsepower and higher torque figures.

That alone brings up questions of the true power rating. If in every other application, the horsepower goes up so does the torque, why not in the Maxima.

Honda then releases it's 240 hp Accord. Nissan, wanting to still claim the most powerful V6 in it's class, then re-rates the Altima's horsepower at 245 but the torque is unchanged. Again, huh? What EXACTLY did they change on the car that would give it 5 more horsepower, but not change the torque rating?

Then the 2004 Maxima comes out with 265 hp and 255 tq.

Now, how can the Maxima have 265 hp and only 255 tq when the Infiniti G35 sedan has 5 LESS hp, but 5 MORE tq??

Now enter the 2005 Altima. Again, Nissan adds 5 hp to the car, but this time they add 3 lbs-ft of tq as well. But wait a minute. If it's rated at 250 hp, that's still 5 hp LESS than what the 02/03 Maxima's were rated, but they were rated at having only 246 lbs-ft of tq (3 less than the new 2005 Altima.

What the heck is going on with Nissan/Infiniti with this 3.5 liter V6.
They are making so many different rating claims, that I think they are confusing THEMSELVES!!!

I think they are just throwing numbers out there. When the 2002 Maxima's were first coming out, they rated them at 260 hp, but changed it to 255 hp, probably realizing that they were soon going to release the Infiniti G35 rated at 260 hp so they didn't want to infringe.

And then when the Altima came out, they rated it at 240 because they didn't want to infringe on their flagship car, the Maxima. I drove both of these cars (Altima and Maxima) in January 2002 and could feel that the Maxima had a bit more oomph to it. Represented by the fact the auto mags got slightly better times with the Maxima than did the Altima. But then, when the Altima was re-rated to 245 hp, it's performance seemed to increase more than the 5 hp would suggest. Going off of the auto mags performance numbers at that point.
Did they give the Altima the "Maxima" treatment (ie: giving it 10-15 hp more in reality) but kept the numbers down so it still wouldn't step on the still selling 2003 Maxima?

But once they released the new (and too big and fat) 2004 Maxima with more power, they were free to "increase" the Altima's power to the 250/249 of the 2005 model? I'm curious to know if the performance is going to increase again, or stay the same, suggesting the re-rating is in numbers only not reality.

And lastly, why does the Infiniti G35 Coupe get 20 more hp and 10 lbs-ft or torque more than the sedan. I know the Coupe weighs a bit more, and for some unknown reason, therefore costs more (which is counter intuitive considering coupes historically don't sell NEARLY as well as their sedan counterparts) you'd think they'd price the coupe NO MORE than the price of the sedan. It would seem a bonus then to get the sleeker looking car, with a bit better power to weight ratio (I think) and pay the same price.

In any case, sorry for the SUPER long post. It's just confused the heck out of me and I'd love to hear a logical reason for all of Nissan/Infiniti's seemingly not rooted in facts power ratings of the 3.5 liter V6?

Hey, anybody know if the 2005 Infiniti G35 is going to change much and is it going to get a "power boost" Nissan/Infiniti style?
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Old 06-04-2004, 08:41 AM
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Marketing .
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Old 06-04-2004, 12:33 PM
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SR20DEN does have a great point... y buy a maxima if the cheaper altima can give you the same hp? or y buy the 350 if u get the same power from a maxima? those would be the kinda questions people would be asking if they were al rated the same.
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Old 06-04-2004, 01:02 PM
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some of the cars have better exhaust and intake systems so that can have to do with the differient figures for the same engine. but im sure a lot of it has to do with marketing like others have mentioned.
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Old 06-04-2004, 02:09 PM
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I'm going to repost what I read in another forum.
Exec "Ooop, its time for the 2005 models. Change the literature to say 15 more hp and tq." *goes to warehouse the size of texas full of VQ engines* "You're all slightly more powerful now. If anyone asks how you kill them." *hands out knives to the VQ engines*
VQ35 = ninjas
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Old 06-04-2004, 02:30 PM
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a lot of it does have to do with the intakes and exhausts and other components.
Marketing is a great point aswell because if you pay close attention everyone is on a Horsepower war trying to claim more than the other. I mean the first thing they usually talk about is the horsepower.
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Old 06-04-2004, 02:38 PM
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The G35 Sedan and Coupe are suppose to get around 15hp and about 10tq for 2005
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Old 06-04-2004, 05:36 PM
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Originally Posted by kevlo911
The G35 Sedan and Coupe are suppose to get around 15hp and about 10tq for 2005

Really? I can't imagine the G35 coupe getting really any power boost. Unless of course the 350Z is boosted even more.

I figured with the Maxima now rated at 265 hp the G35 sedan needs to be rated at least that high. A slight tweaking to 270 hp and 265 lbs-ft torque from the sedan would be a nice thing.

I've seen 02/03 Maximas with an auto run high 14's at the track.
Anybody seen what the G35 sedan with an auto can run?
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Old 06-04-2004, 06:19 PM
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For those asking about the 2005 G35s:

SAN FRANCISCO (June 3, 2004) – Infiniti, Nissan’s luxury division, today announced a number of significant enhancements to its popular G35 sport coupe and G35 sport sedan for the 2005 model year in North America. The changes include the introduction of a new coupe Sport model, a redesigned exterior appearance for the sedan and a redesigned instrument panel and console area with aluminum trim or optional wood trim on both the 2005 G35 coupe and G35 sedan.

Another major enhancement for the new model year is an increase in power for all G35 sedans to 277 horsepower and 270 lb-ft of torque (from 260 hp/260 lb-ft). The G35 sedan lineup, which added a new all-wheel drive version in the 2004 model year, also receives new exterior styling for 2005 – featuring a new hood, grille, bumpers, side sills, taillights and wheels.

The G35 coupe’s new Sport model will be available in an advanced 5-speed automatic transmission or with a close-ratio 6-speed manual transmission. The Sport 6MT model receives an additional 15-plus horsepower over automatic-equipped G35 coupe’s standard 280 horsepower, bringing its power to the 295-horsepower range (final figures to be released later).

In addition, the manual transmission design on both coupe and sedan models has been improved to provide a lower shifting effort.

The 2005 G35 sedan will be offered in four models, each equipped with a standard 3.5-liter V6, 4-wheel independent suspension and the refined exterior. For 2005, the sport-tuned suspension package has been upgraded with 18-inch lightweight cast aluminum wheels with 235/45R18 tires and drilled aluminum pedals.

The G35 coupe will be offered in three models for 2005, Coupe, Coupe Sport A/T and Coupe Sport 6MT. Both Sport models include a new sport-tuned suspension, Viscous Limited-Slip Differential (V-LSD), 19-inch forged aluminum-alloy wheels and drilled aluminum pedals.

“Infiniti built its reputation on a stunning combination of powerful rear-wheel and all-wheel drive vehicles and outstanding customer service,” said Mark Igo, vice president and general manager, Infiniti Division. “The G35 has been a key element in our recent product line expansion and with the enhancements for 2005, our product momentum remains strong.”

The 2005 Infiniti G35 sedan and coupe with automatic transmissions are scheduled to be available at Infiniti dealers in North America beginning in October 2004. Manual transmission equipped models will go on sale in December 2004.

The announcement came during the Nissan 360 news media event, a three-week program in San Francisco featuring the automaker’s current and future worldwide product and business plans. At the event, about 500 reporters had the opportunity to drive nearly 70 Nissan and Infiniti vehicles to familiarize themselves with the breadth of Nissan’s global product lineup.
From: http://nissannews.com/infiniti/news/...03045431.shtml

~THT
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Old 06-05-2004, 07:31 AM
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Originally Posted by Driver72
Really? I can't imagine the G35 coupe getting really any power boost. Unless of course the 350Z is boosted even more.

I figured with the Maxima now rated at 265 hp the G35 sedan needs to be rated at least that high. A slight tweaking to 270 hp and 265 lbs-ft torque from the sedan would be a nice thing.

I've seen 02/03 Maximas with an auto run high 14's at the track.
Anybody seen what the G35 sedan with an auto can run?
Some 02/03 autos run mid 14's stock as well look at my sign and some others, G autos tend to run very similiar times to 02/03 autos in the 1/4. go to G35driver.com lots of topics comparing the 2, do a search..
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Old 06-05-2004, 08:50 AM
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i never really understood y the auto would get less hp then the manual. is it that nissans auto cant handle the power or something? also i saw something in one of nissans cars about a 4.0 liter 6 cylider engine. i wonder when thats gonna be in a max.
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Old 06-05-2004, 09:19 AM
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Originally Posted by THT
For those asking about the 2005 G35s:



From: http://nissannews.com/infiniti/news/...03045431.shtml

~THT

WOW. Nice new output numbers. Thanks.

But here once again, Nissan/Infiniti is throwing yet ANOTHER confusing power figure. The current G36 Coupe has 280 hp and 270 lbs-ft of torque, but for 2005 the sedan is going to get the same torque rating but 3 less hp???

Why? Why not just tune it to the same specs as the 2004 G35 Coupe and call it 280/270??

And with the Coupe now getting 295 hp, what's going to happen to the 350Z?
The Coupe with the manual already runs a 0-60 time of only .1 seconds behind the 350Z and probably within .2 in the 1/4 mile. With this new power, it SHOULD run faster than the 350Z. I wouldn't think Nissan would want the luxury version to be faster than their sportscar. Does this mean for 2005 the 350Z is going to get 295+ hp?

I'm curious to find what BMW's counter is going to be. With many automotive journalists now ranking the G35 above the BMW, this new power should make them even more desirable and cut into BMW 330i sales even more.
My guess is a 3.2 liter inline 6 from BMW. But knowing BMW they'd call the car the 335i
And I'd guess, as usual, they'll underrate the power and probably peg it at somewhere around 250 hp when it'll probably be making 260+ in reality.

Man that G35 sedan with 6MT coming in December 2004 might be a highly desirable ride for me now. Hmmm.
I was hot to get the new Subaru Legacy GT in the next month or so (I don't like getting the really early ones, just in case there's problems).

That would be a wicked close comparision test Legacy GT Limited vs. 05 G35x (maybe by then the G35x will be available with a manual).

Oh, lastly, thanks to the guy who gave me the 1/4 mile times. I kinda figured the current G35 sedan with an auto runs about what the 02/03 Max does. I drove one and it didn't feel much, if at all, faster than my Max.
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Old 06-05-2004, 03:15 PM
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350Z will prob go up 300-320
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Old 06-05-2004, 04:37 PM
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Originally Posted by Driver72
WOW. Nice new output numbers. Thanks.

But here once again, Nissan/Infiniti is throwing yet ANOTHER confusing power figure. The current G36 Coupe has 280 hp and 270 lbs-ft of torque, but for 2005 the sedan is going to get the same torque rating but 3 less hp???

Why? Why not just tune it to the same specs as the 2004 G35 Coupe and call it 280/270??

And with the Coupe now getting 295 hp, what's going to happen to the 350Z?
The Coupe with the manual already runs a 0-60 time of only .1 seconds behind the 350Z and probably within .2 in the 1/4 mile. With this new power, it SHOULD run faster than the 350Z. I wouldn't think Nissan would want the luxury version to be faster than their sportscar. Does this mean for 2005 the 350Z is going to get 295+ hp?

I'm curious to find what BMW's counter is going to be. With many automotive journalists now ranking the G35 above the BMW, this new power should make them even more desirable and cut into BMW 330i sales even more.
My guess is a 3.2 liter inline 6 from BMW. But knowing BMW they'd call the car the 335i
And I'd guess, as usual, they'll underrate the power and probably peg it at somewhere around 250 hp when it'll probably be making 260+ in reality.

Man that G35 sedan with 6MT coming in December 2004 might be a highly desirable ride for me now. Hmmm.
I was hot to get the new Subaru Legacy GT in the next month or so (I don't like getting the really early ones, just in case there's problems).

That would be a wicked close comparision test Legacy GT Limited vs. 05 G35x (maybe by then the G35x will be available with a manual).

Oh, lastly, thanks to the guy who gave me the 1/4 mile times. I kinda figured the current G35 sedan with an auto runs about what the 02/03 Max does. I drove one and it didn't feel much, if at all, faster than my Max.
Your right the current G autos run dang near the same times us 02/03 auto run, I guessing the 350Z will have 300-305 hp at Max. They also may keep the automatic at 287hp and boost the manual like they did with one of the 05 G35 Coupe packages.
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Old 06-05-2004, 08:27 PM
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Can we say 350Z TURBO?
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Old 06-06-2004, 03:49 PM
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Okay, here's something very very basic.

Horsepower = (Torque x RPM) / 5252

Horsepower is simply a function of torque output and RPM. That's it. That's the formula.

Now, lets say you have two engines that both make the same peak torque at 3500rpm. But now say that one engine's torque curve drops off like mad at high revs whereas the other one stays flat. Both engines make the same peak torque, but since one holds a flatter torque curve up top, it will have more peak horsepower as per the formula. This is why Honda VTEC engines can make so much peak horsepower yet have little torque. So it's entirely possible to gain peak horsepower while torque remains unchanged, or even drops. In fact, if you put the MEVI on a 95-99 Maxima you do in fact lose peak torque. But the torque curve stays a ton flatter up top and you gain peak horsepower. Go search in the 4th generation FAQ for the MEVI post.

When you compare the 02-03 Maxima to the G35 (both 6MT), this is what you get on a chassis dyno. Both engines have roughly the same peak torque. But the G's torque curve stays flatter up top, and therefore it has a ton more peak horsepower.



You can also normalize out the torque curves and then it's easier to see a more fair comparison. It "looks like" the Maxima version has a different intake manifold setup with slightly better volumetric efficiency (VE) at low revs, but at expense of high-rpm power. Since it's for a family sedan, having power optimized for low/medium engine speeds is wise. The G is different. It's powerband is biased for more top-end performance. You can see that below.





There are also a few different versions of the VQ35DE.

"Series II": 240hp/265tq (Altima, 5.5g Max/I35, Murano, Pathfinder)
"Series III": 280hp/270tq (G35, FX35, 350z, 04 Max??)

I'm thinking that the new 295hp G35 coupe may have a newer "Series IV" VQ35DE engine if they've made enhancements to it over the 350z version. BTW, a "Series I" VQ would be a 3.0L. There may also be a "Series II.5", as some engines seem to have something beyond a "II" but are not quite a "III". With Nissan sticking with the same VQ35DE engine code for everything, it's just getting harder and harder to track.
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Old 06-16-2004, 09:59 AM
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Here's another interesting thing to ponder:

The G35 sedan is the most aerodynamic of all the cars using the 3.5 liter V6
.27 cd (.26 with aero pack.)

The G35 coupe is .29 (.28 with aero)

And the 350Z is .30 (or ONLY the track model is .29 cd. So, I'd say 95% of 350Z's are .30 cd

Infiniti MIGHT have limited the 2005 G35 sedan's power output to 277 hp and 270 tq because anything more would make it faster than the current 350Z's.

As it stands with those power increases it's probably only going to be one-tenth of a second slower in the 1/4 mile and maybe 1 mph off.
So I'd say 0-60 in 5.6 seconds and a 1/4 mile time of high 13's at 101 mph.

But what's really interesting will be to note that the 05 G35 sedan might actually pull away from an 03/04 350Z above 100 mph! With it's superior aerodynamics, and having the same tranny, the 05 G35 sedan with it's increased power SHOULD allow it to out accelerate a 350Z above 100 mph!

That's probably another reason why the G35 coupe got a bit more power than the sedan. With 80+ pounds more weight in the coupe and less aerodynamic, the extra 10 hp and 10 ft-lbs tq offsets them both.

Man, that 2005 G35 Sedan is looking MIGHTY attractive right now. Hopefully the redesign looks that much better too.
Anybody got pictures?

2005 Subaru Legacy GT
2005 Infiniti G35 Sedan

That might be a pair of sport sedans to own. Or make the Legacy the wagon. Hmmm
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Old 06-16-2004, 10:34 AM
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Old 06-16-2004, 10:34 AM
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I drove the Legacy GT wagon (manual). It's unbelievable...I almost bought the car on the spot I was so impressed with it. Tons of storage/cargo space, tons of power (seemingly endless), good acceleration, good handling, great interior...

What's not to like about it?
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