Gear Ratios - What should I do...

wjw · Post by **wjw** » Fri Apr 27, 2007 10:46 am

Well the 4.88 C &P's I ordered from the US have arrived, but they are actually 5.29's. Trying to decide what to do as at 100Km's its struggling you can see why below:

Code: Select all

Tyre       Diff      RPM @ 100KM
31"         4.3      2097 - FACTORY
35"         4.3      1858 - CURRENT
35"         4.8      2108
35"         5.29    2285

So do I put the 5.29's in... those of you with 2JZ's what does your motor sound like sitting at about 2300-2500RPM???

I have no tacho so cant play

hiriklux · Post by **hiriklux** » Fri Apr 27, 2007 1:52 pm

come take mine for a hoon bill it has taco and 2 speedo,s :wink:

SupraLux · Post by **SupraLux** » Fri Apr 27, 2007 2:21 pm

Stop being such a pussy... put em in, sell the 35's and get some 37's... that will fix everything

Steve

wjw · Post by **wjw** » Fri Apr 27, 2007 2:59 pm

the 5.29's are going in ... just got to get my locker back that I lent out...

wjw · Post by **wjw** » Fri Apr 27, 2007 3:00 pm

hiriklux wrote:come take mine for a hoon bill it has taco and 2 speedo,s

dont you mean two speeds... fast and faster?

Petemcc · Post by **Petemcc** » Fri Apr 27, 2007 3:07 pm

you should notice a huge difference in drivability with them. i changed from 4.3s to 4.8s wity 33inch tyres on my V6 surf and it is so much better to drive on the road now. you have more power and a bigger change.
i reckin you will be happy with them. 2500 doesnt sound that high to me.

Pete

IcedJohnno · Post by **IcedJohnno** » Fri Apr 27, 2007 4:38 pm

HI Bill
I had already formed the opinion that your truck on 35's and the petrol engine should be more lower geared that of the 4.88's.
Think about the two differing torque figures and what revs they are at. I am sure that max torque will be at greater than 2000 RPM.
Even if it wasnt, the rev range of the jz means that the thing will sing up to what 6k? The 1KZ runs out as you know and have tried :lol:

at about 3.5 perhaps 4 and definately all over at 4.3k.

GO THE LOW GEARS AND LETS HERE HER SWEET SIX SING.

NA_Drifter · Post by **NA_Drifter** » Sat Apr 28, 2007 3:52 am

My LN130 with 2JZ got 4.3:1 and 265/70/15
at 100km/h
@5th 2600rpm
4th 3050rpm

4x4skid · Post by **4x4skid** » Thu May 03, 2007 1:11 am

hey there, are you just swaping the crown wheels and pinions??

im looking for the c/w and pinion for my rear end in the 4.3 ratio, have found a couple of diff heads but i have 3 spare heads so only realy need the gears,

what do ya reckon??

cheers Skid

hiriklux · Post by **hiriklux** » Thu May 03, 2007 7:58 am

hey bill just a thought i hooked up my speedo the other day before i ripped the axle out and according to the gps speedo its only about 5 kms out at 100ks :cry:

which means my ute isnt as fast as i thought :cry:

and mines on 4:3 s which when i looked closer aat them are starting to chip away on the outerside of the crown wheel :shock:

my over valued 2 c worth rik

wjw · Post by **wjw** » Thu May 03, 2007 8:29 am

I haven't taken them out yet, but I'll pm ya when I do.

Rik... your just rough ;-)

These are brand new so hopefully they will last. Tim hasn't had trouble with his 5.29's. I'll fit them and see what happens. No point leaving them in the shed now I have them. Just have to avoid doing burnouts and wheel spinning at the lights.... :lol:

If they die, it'll be onto Prado 4.8's