I was wondering what your guys rpm is at goin 70mph in 5th gear because in 5th gear me doin 70 I'm doin 3k rpm and I got a 5 speed not 6

 

It all depends on your tire size.

With stock tires you should be doing ~2750 in 5th with the stock 17s. With an A33B 6MT in 6th it'd be ~2300.

Is there a problem you think you have, why did you make this thread?

 

The speedometer reading doesn't depend of the tire size. Actual speed does.
The 3000 RPM sounds about right for the 5 speeds box.

 

You should stop talking now, your wrong.

pmohr generally does not comment unless he knows what he is talking about. You should do less and more listening.

 

I'm not sure exactly but I know that when I'm on the interstate (typically traveling between 70-75 MPH) my tach is around 3,000-3,100 RPMs on stock 17s in 5th gear.

 

Wrong for the 6MT...with the stock tire size I was turning around 2k RPMs...2400 is 80 mph.

 

So everyones talking about there rps and what not, but wheres the problem if any..

 

dam my car is usually pushing those rpms at 70 with my stupid automatic

 

Blitz do you have the overdrive off when you drive at those speeds.

 

yup its because my car only has 4 speeds and his has 6. the more gears the lower the rpms will be at higher speeds(generally)

 

Not true. Typically more gears means closer ratios and less gears means further ratios, notwithstanding the highest gear's ratio. In fact, correct me if I'm wrong, but most AT cars cruise at a lower RPM in 4th on the highway than their MT counterparts do in 5th.

 

That sounds about right..

Umm i hate to change the subject but is there such thing as a 5 speed auto maxima or are the only 4 speed?

 

Yes 4ATs rev lower than the 5 speeds...however the 6-speeds have a double overdrive and because of this, even with the longer gearing of the auto, it revs lower. The 4ATs have very long 3rd and 4th gears, which is why they rev lower...

 

They didn't introduce a 5AT transmission to the maxima until the 6th gen in 2004, so all 5/5.5 gens are 4 speeds.

 

.

 

Ah, I think I calculated for the A34 6MT.

 

Although reading his comment confused me. I need to go wake up...

 

I'm so sorry to confuse you... Well...the speedo doesn't know what tire you occur to put on. It calculates the speed according to the driveshaft RPM. Yes, the REAL speed does change (the smaller the tire, the slower), but we can't see it on the instrumental panel. Also, any given gear/engine RPM produces strictly determined number on a speedo table and can't be changed (unless the clutch is slipping).This is because of direct mechanical connection between the components (we are talking about MT)

 

We don't have a driveshaft....nice try on the googling work, though. Yes tire size will affect the speed on the instrument panel. A smaller tire will read higher on the spedometer than you are actually traveling, and vise versa

 

so then why is my car reving so high at highway speeds. Im generally at 2.5 rpms at 70mph. is that normal? I just put it in D for highway driving(and all driving for that matter). correct me if im doing anythign wrong

 

1. Maxima 2002 - 2003 FCM:



2. You forgot to say, the engine RPM will be accordingly higher, too, comparing to the stock tires.

 

FCM?

We don't have a drive shaft. We have two axles, that's all. It's all semantics, but if on a RWD vehicle you call the two shafts which deliver power from the diff to the wheels axles, why would it change at all in a FWD vehicle?

Same exact thing, different packaging.

 

Sorry.. my speling... It's FSM - Factory Service Manual. Nissan gives pretty stupid names to their parts. By Nissan, an axle includes several components, one of them - drive shaft.

 

FSM? Never heard of it.

 

It will probably go 500ft over his head lol.

 

Tested today with 17" 45 profile tires on a 5 speed, 70mph = 2800 RPM. 73 mph = 3k rpm.

 

no, no problem here i was just wonderin if maybe i had a problem lol so it doesnt guzzle gas at 3000rpm

 

Your basic explanation is correct, but technically you have some errors. No manufacture takes the speed measurement from the driveshaft (axle) (at least not today) because it would be too inaccurate. You cannot account for changes in axle speed when you are turning left or right, as the inside and outside wheels move at a different speed in a turn. The speedo sensor or drive gear is normally connected to the transmissions final drive to provide a more accurate reading. On the 3rd, 4th, 5th, and 5.5th gen Maxima, the speedo sensor reads off of the differential, there is a plastic gear on the diff just for this purpose.

For determining adapter requirements when one is used, the formula is:
(1000) (Ratio of Speedometer Driven to Drive Gear) divided by:
(Tire revolutions Per Mile) (Rear axle ratio) = Speedo adapter ratio

Adjustable electronic speedometers usually use dip switches to adjust for variables, manufactures such as Ametek have a downloadable program that just has you enter the same information and it tells you which switches to adjust.

For the most accurate adjustment of a speedometer, tire revolutions per mile must be used, not tire size, as this can vary by manufacture. We don't really care about this in a passenger car, but in the transportation industry, they rely on accurate milage to get paid properly.

Thanks for dumbing it down for me, but figuring out speedo ratios is something I do on at least a weekly basis as part of my daily job.

 

half shaft or axle would have been a better term...but see mtrai's post above: the speed sensor is inside the transmission.

Now we're getting somewhere!

 

Thanks for correction, good point about turning radius.

 

On my old 97 5spd I'd be turning 3k rpm @72-75mph.
Thought it was a bit weird considering 2nd would top out around 65-68mph

 

i gut a clutchmaster stage 2 in mine (6spd) and at 70mph im around 2500rpms in 5th maybe 3100-3400 rpms

 

You do know that the clutch has absolutely **** to do with speed/RPM, right?