Callaway

this car should have 6 or 7 gears in auto. when i first saw how high the rpm's were at 75-80 cruise, i thought something was wrong with my car.

Nobara37

I think there is a small difference in specs form the cars sold in the US and the cars sold here. I'm not sure what they are but i know there are some mechanical and interior differences.

Maybe that's why it reves lower than the US spec G37.

Just a thought...I still love my car!

DetroitG37Joe

iTrader: (2)

If that's the case consider yourself lucky you are probably getting better mileage than the USA 5ATs...In fact are you sure your G37 in the UAE produces the same HP/TQ as ours? Sometimes cars produced for different markets (USA, Euro spec, Japan Spec, etc) have different specs?

CarAddict

I just looked at the Infiniti Middle East's website. The G coupe over there makes 350HP @ 7000 RPM!!! WTH??!!!

gan78mao

iTrader: (1)

^they prolly overrated it!

gan78mao

iTrader: (1)

i think it would be perfect to be a lil less than 3k at 80mph for 6mt althought we are at a little bit more than 3k

i drove my friends 335 and he was at 2.7k at 80 which i was really suprised!

Sunny81

The US went to a standardized system for hp ratings across all manufacturers in 2005. Most car companies saw a drop in their advertised hp ratings under the new SAE rating system. Our G37s rated at 330 might have been somewhere close to 350 under the non-regulated rating system.

*somewhat related interesting fact. Only one car company gained noticeable hp numbers under the new guidelines, Cadillac.

New SAE ratings article

CarAddict

Interesting! Thanks for the info!

ashishxpatel

I used to have a 2005 SC430, which was a V8 and the RPM were much lower at high speeds. Does the V8 engine have anything to do with it?

I have noticed that my G37 start getting close to 2700RMP around 65MPH.

I'm just trying to figure out what causes the RMP levels to be so different.

Thanks.

Keng

It's the gear ratio not the V6/V8

DetroitG37Joe

iTrader: (2)

True but if im not mistaken its more typical of a v8 to allow for gear ratios that allow for lower RPMs at higher speeds...I guess its just something Ive noticed...For instance on our Lexus GS400 which is a 4.0L v8, even though redline is around 6.5k, the car only does 2.5k at about 80 MPH!

Sunny81

It has to do with both the gear ratio and the V8. I used to have a V8 also, 4.7l Grand Cherokee. That car could never do the 0-60 that I can pull on my 6MT, but it sure felt like more of a monster from 0-30. V8s have 2 more cylinders, obviously, so they are usually meant to rev lower. The extra cylinders also allow for more instant low end torque. That's not to say however that you couldn't set up a V8 to be a high performance high red line monster i.e. the new M3 (8300k red line). It's all about what the cars were intended to do and that's how the ratios are set up.

dmx434343

at 98mph im at 4k rpm 5 AT

RhiNoKiLL

iTrader: (2)

Aren't V8s and higher terrible for low end torque? Simple phyiscs right? More cylinders to push = more time to get reving fast...isn't that why rally cars use 4 cylinders for fast accleration/torque? I thought V8 and up are for top speed and use turbo / supercharge to help

G2Envy

iTrader: (1)

This is what I've observed in my 6MT (6th gear of course!):

80 mph - 3100
75 mph - 2900
70 mph - 2700
65 mph - 2500
60 mph - 2300
55 mph - 2100

Some guy on another site, not sure if it's true for all vehicles, stated that for every 5 mph, the rpms should move up or down by 200 rpm. Seems to be working according to my above observations

Hmmm after calculating I'm not sure if this really works all the way across the RPM range. Redline is 7500 so:

7500-3100 = 4400;
4400/200 = 22;
22*5 = 110;

That means from 80 mph @ 3100 rpm, I have another 110 mph until redline. 110+80=190 mph @ redline? Wow I must have been really bored to do this. Doesn't make sense to me. Of course this is not considering there is limiter, among lots of other factors haha