revs at 100kph?

Joined: 18 Sep 2003 Location: lost

What revs do people find they are doing at 100kph?
My vehicle is a gq diesel with 35" tires and it is doing about 2400 rpm @ 100
Just curious as to what others are at

Joined: 24 Feb 2004 Location: Sydney Australia

2.8TD GQII. Im running 275/70/16 which is a 32" (I'm told) and its doing about 2950rpm. Seems like its revving its nut off! Crying or Very sad

Joined: 27 Nov 2002 Location: Lost in Melbourne.

fatass75 wrote:

What revs do people find they are doing at 100kph?
My vehicle is a gq diesel with 35" tires and it is doing about 2400 rpm @ 100
Just curious as to what others are at

125-130 is 2200.... diesel 4.1 and 33's
80 is undrivable in overdrive, it changes between that and 2nd...

Joined: 17 Dec 2003 Location: South Side Brisbane

GQ - 4.2Pet - 31's - Basicly stock

2400 @ 100Kph

Joined: 18 Sep 2003 Location: lost

My truck has got 4.8 diff gears so I am glad it has 35's on it!!!! Shocked

I bought the truck knowing it had ratio changes but when I saw the receipt for 4.8's I nearly shat!!! Laughing

I thought they would have been 4.6's

Cool though got plenty of pick up.

Where would these(4.8's) be from? After market ones? Or does something come out with these.

I still have the 4.1's too!

Joined: 27 Nov 2002 Location: Lost in Melbourne.

fatass75 wrote:

Where would these(4.8's) be from? After market ones? Or does something come out with these.

aftermarket.
they dont come stock in any Patrol... u r lucky female bits..

Joined: 08 Nov 2002 Location: wheeling the guppy

DBW wrote:

2.8TD GQII. Im running 275/70/16 which is a 32" (I'm told) and its doing about 2950rpm. Seems like its revving its nut off! Crying or Very sad

u should have a ride in my zook! 4200 rpm at 100 Very Happy

Joined: 24 Feb 2004 Location: Sydney Australia

redzook wrote:

DBW wrote:

2.8TD GQII. Im running 275/70/16 which is a 32" (I'm told) and its doing about 2950rpm. Seems like its revving its nut off! Crying or Very sad

u should have a ride in my zook! 4200 rpm at 100 Very Happy

Hahah!

I have owned two, sick of getting all the lads to carry all my gear. (more like they were getting sick of carrying my gear Laughing

)

Joined: 03 Nov 2003 Location: Melbourne

GQ shorty, manual, petrol, 31" ATs 100 = about 2400 revs, and 110 = about 2600 revs.

with the 34s i will test next saturday Very Happy

Joined: 01 Nov 2003 Location: melbourne, Doveton

GQ 4.2L petral cruise on about 2300 - 2400 @ 100
and iv got 31 tyres

Joined: 25 Oct 2003 Location: Melbourne Australia

Is everyone taking steps to ensure that indicated speed and actual speed are the same?

Like, Hottiemonster - if all you do is whack on the 34s, you're gonna get the same results from the instrument panel as you do with the 31s.

Because quite frankly this is simply a matter of calculation - if you know what gearbox you have, what transfer gears, what diff ratios, and what tyres, then I can tell you what your revs are at 100km/h.

Such an odd thread.

Jason

Joined: 24 Feb 2004 Location: Sydney Australia

Odd is interesting! Very Happy

Joined: 18 Sep 2003 Location: lost

Hey Chimpboy,
Yeah I know you can work it out and that actual speed in this case would be different in each case.

I was hoping someone as wise as yourself Rolling Eyes

would pipe up and give us all the benefit of your wisdom and post what that formula is as I have forgoten it about 3 times!!!!

I was mostly trying to see if it there are actually 4.8's in the diffs on mine

Is there a way to do this without pulling em out? Maybe an alternative formula?

Joined: 06 Jul 2003 Location: WA

The formula is...... 100000/60=1666.667 then your tyre circumfrence which = Pie x the diameter eg. 3.142 x 889mm = 2792.87 then 1666.667/2.79287 =596.75 then times that by you diff ratio and then by your fifth gear ratio ( 5 speed = 0.85 in 5th 1:1 in 4th) this equals your exact rpm 596.75 x 4.88 x 0.85 = 2475 revs per minute

There fore if you are running 35 inch tyres (exactly) have 4.88 diff ratios and are running a 5 speed gq box your revs at 100kph = 2475

Joined: 17 Dec 2003 Location: South Side Brisbane

so is it possible to correct the speedo reading when bigger tyres are installed ? Say 33's instead of 31's

Joined: 27 Nov 2002 Location: Lost in Melbourne.

Draven wrote:

so is it possible to correct the speedo reading when bigger tyres are installed ? Say 33's instead of 31's

You can buy the speedo drive gears from nissan to change the speedo. $20-30 for the gears, and they go on the gearbox end.. POP to install according to guru man.

Joined: 04 Jun 2003 Location: Just Near Fraser Island

80 series running 4.1's, 37 MTR's, Auto = 1250rpm @ 100kph (Actual road speed)

Joined: 21 Oct 2003 Location: North East Melbourne

now thats economy!

in fifth about 4200rpm @ 200 km/h

in 4th about 5000rpm @ 200km/h Wink

(2100rpm @ 100km/h)

MaccA

Posted: Fri Mar 12, 2004 1:45 pm

2200RPM for 100kph road speed, 33 bf muds, 4.1 gears, 88kph on speedo (12% correction to allow for tyres). This also means I do my oil changes at actual 4400km intervals, with 5000km passing on the odo (in comparison to factory tyre sizes)

Joined: 06 Jul 2003 Location: All Mav'ed up!!! (Melbourne)

try this link for automatic calculations

http://members.optusnet.com.au/~zerosin/gearcalc.html[/url]

Joined: 20 Feb 2004 Location: Melbourne

At 100KM/h--about 2400--110km/h 2600 35" BFG's with 4.6's

Nick

Joined: 03 Nov 2003 Location: Melbourne

Woop wrote:

At 100KM/h--about 2400--110km/h 2600 35" BFG's with 4.6's

Nick

thats what mine is with 31s and 3.9s

Joined: 24 Nov 2002 Location: Melbourne

GQ diesel 35s 2240 at 100kph 4.375 diffs
Verified

bazzle

Joined: 14 Nov 2003 Location: Roma Q

Stock standard 97 4.2 diesel Patrol- 2250 rpm at 100 k. I've done 1100 km since yesterday 2.10 pm , Roma - Brisbane, spent 1/2 day in Brisvegas picking up gear all over the bloody place and then back home by 8.30 pm tonight. I kept track of fuel used as well, approx 16L per 100k, not too bad for an av speed of 100kph for the trip

Joined: 15 Apr 2004 Location: Wyong

I run a MQ with a 308 and Cabstar box 0.777 fifth gear, with 32x11.5x15 and 4.625 diffs currently does 100 at 3000rpm, going to install 4.111 will drop to aprox 2500.

Joined: 08 Nov 2003 Location: yarrawonga northen victoria

you can check your speedo find a mesured distance eg two km post's time the distance then divide that into 3600 will give you your speed eg 36 secones (spelling) into 3600 gives you 100 km per hour

Joined: 24 Nov 2002 Location: bacabugari

100kph on the GPS gives 2150 revs with 35 bfg's on my gu ute with 4.625 diffs.....
speedo shows 102.5 ish