Right....Need to remembe the whole rotational mass thing....

Thanks.

 

Thanks for the breaking news dave. If you didn't cover this, no one might have known about it!!!

 

If both cars are putting down the same 1/4 mile times... then they don't have the same power under the curve. The '05 is heavier, so in order to put down the same 1/4 time, it's making more usable power as well.

 

Why is the 05 heavier?

 

Very true. The 05 is heavier. The 03's always showed to dyno slightly less than any G35. The 03.5 gained some more, and the 04s did as well. But through out the years they all gained weight. Reason why the 1/4 times haven't changed much is due to weight. This is why 1/4 times are useless when comparing years and power.

 

Like daveb said and plus the mass moment of inertia equations from physics helps too... why do you thing drag slicks are so big with small rims... otherwise everyone would be at the drag strip with 20's and 35 series profile tires....not to forget that traction is a factor too....

 

IMO, the whole weight gain thing is highly debateable. The perpetuated myth across this site is that the 05+ weighs 150lbs+ more than 03/04s. I must beg the question then, where did all this weight come from? Infiniti did nothing to the chassis other than make 18s an option (and Russ says this combo is no heavier than the 17s) and larger brakes were added. The 6MTs gained some additional hardware on the cams, but that's it. No safety changes like chassis reinforcements were made nor were they stated by Infiniti. In the end, the 05 might weigh 10-25lbs more than the prior years. Infiniti has screwed around with thier curb weight ratings since 03. Look in Motor Trend and the curb weights for the 03 sedans range from 3380lbs to 3450lbs. When they tested the 04 sedans, the curb weight became 3,460-3,480lbs. Then the tested 05s were rated at 3570lbs. I've weighed my loaded 2003 on a CAT truck scale and it came in at 3460lbs with a 3/4 tank of fuel and 15lbs of tools in the trunk. Members of this site have weighed their 05 6MT/5ATs and have gotten curb weights of 3480-3510lbs with nearly full tanks of fuel. That data to me suggests there's hardly any differencee between the curb weight of any year. I'm just going off what's been posted here and what my 2003 weighs. With such minimal weight and power difference, it explains why the 1/4 mile times and mphs are basically the same.

As for the 03s being the lowest powered of all G's, I don't agree. Until I see stock 03.5+ 5AT sedans posting better than 14.2/14.3 and 98mph trap speeds, I'll continue to believe there's no real power difference between an 03and anything later.

 

Actually, you make about anything highly debatable.

So in the same paragraph, you're going to say the power and weight is the same, but then also that the 2005+ do indeed have more weight?

I weighed my 2005 6MT sedan, and it was spot-on the brochure specs of ~3512. I doubt previous years were only "10-25" pounds lighter.

And I would take MT or any other mag weight with a grain of salt - I would bet they just reiterate manufacturer specs, and don't take the time to actually go weigh the test vehicle.

 

Wow, did I lose a few brain cells by reading this stupid post?

 

10-25lbs is hardly going to slow a car down in the 1/4 mile. The curb weights aren't going exact, but they're within ~.5% when you consider a 25lb difference.

As for you 05 6MT, keep in mind that the Aisin 6MT weighs about 40lbs more than more compact Jatco 5AT. That means an 05 5AT sedan with the same options as your car should weigh in around 3,470lbs or within 20-30lbs of my 03.

As for the mags and curb weights, sure, they only report the data as provided by the manufactuer. That's a given.

 

Why waste our time with a comment like this? Why not post something worthwhile to read?

 

Please detail what was changed for the 03.5s and the 04s for them to make more power.

 

I know one difference is the 03 has a clutch-driven main fan. Russ and others will tell you that sucks out 10whp though there's never been a dyno to confirm this. When it's disengaged, many people with tell you that the plastic fan causes a parasitic loss because of the additional power needed to spin the fan. What they fail to realize is that the pulley the fan and clutch is mounted to is found on all RWD VQs whether they have a clutch-driven fan or all electric fans. The clutch fan assembly probably adds about 2lbs of additional rotating mass to the accessory system. I guess this could suck out a couple 2hp.

Only under the most severe conditions, do I hear the clutch-driven fan engaged. This is usually when it's 90 degrees out and I'm at a stop light for a prolonged period. Once the car shifts to 2nd, the fan is disengaged. When the fan is engaged, you can really hear it because it howls. At all other times, the fan is simply all for the ride on the accessory system and the raditior electric fan is pulling cooling fan duty. When the clutch-driven fan is engaged, it will suck out more power, but the same can be said when the 03.5+ VQs have all they're electrical fans engaged because those systems put a large load on the alternator.

Another difference is the 03s had two slightly different oil pan layouts available. The VQs were known as the Phase I and Phase II. Basically the Phase II motor had a slightly better oil pan layout though it would hardly account for any power difference. I believe the Phase II engines were introduced in the July 02 and later build dates. My friend has a Phase I G35 and mine is a Phase II. With a plenum/Z-pipe and an additional 180lbs in weight (he's 100 heavier than me, amps and sub box, spare left in), his G has done 14.50 at almost 98mph. I don't think there's any difference because I'd bet I could get his car into the 14.2s@99mph with me driving and all that stuff removed.

 

Let's see here. My 04 G35 Sedan weighed in at 3420 without me.

The 05 weighs in around 3500+ (haven't weighed mine yet). Could be 150+ lb heavier.

Yes there is more weighed added Dave. It is obvious by your post above that you again have no clue what your talking about! How many more stupid posts are you going to make?

The car gained weight from:

Wheels / Tires
Engine internals slightly more weight
Front facia, front fenders, different grill, different tail lights.
Interior quality better made (soft material than plastic, alum center console, more sound deaden materials).
I could keep on, but I don't have a lot of time at work. The car gained weight. The car gained more hp. But 1/4 times are the same. The 03 6mt was the one that dynoed the least. The 03.5 showed more gains on the dynos overall, the 04 as well.

Like I said, you can't go by the 1/4 times because weight plays a huge factor into the car. So yea they may go the same in the 1/4, but the newer cars are making more power. EOD.

Until you can actually prove me otherwise instead of making up some more BS about oh 1/4 times oh the mag weight oh the manufacture weigh oh and so on. Enough is enough!
PS, take your own advice on your other post to me about my smart comment I made. You spew more incorrect bs on this forum than anyone else.

Edit: Glad to see you are learning something from others here. I remember you argueing back a few months ago and you had no clue what Phase I and II was. lol

I am done here. I will let others take over.

 

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