Speedo/Tacho and a T50

[riojin]

ive noticed a difference between my last two ae86's

my last car with a standard ADM T50 would rev at about 2950rpm when going 100km/h in 5th gear

my new car with a standard ADM T50 revs at 3100rpm when going 100km/h in 5th gear


i opened up the guage cluster in my new ae86 to make the tacho work with the gze. i bumped the needles and tried to put them back in place to the best of my ability.

so the question is, how much is your engine revving with your ADM T50 when going 100km/h in 5th gear?

[stinger_007]

Same diff ratio's?

[Wanabe_Garage]

just under 3000rpm with adm diff


3100rpm with jdm diff

did your two cars have different final gears?

[Gilly]

maybe one has 3.7 or 3.9

and the other

4.1

** If both diffs are T series (S series is 3.9 as well)

[riojin]

im guessing they were both the 3.9 ratio s series diff. i may have a t series rear end but havent checked. i do know its drum however. is there an easier way to check the diff instead of getting under the car and measuring the housing?

[Gilly]

count the nuts holding the diff centre in

8 = s series

10 = T series

S will have 3.9

T will have either 3.7, 3.9 or 4.1

my guess is both cars have a different diff ratio/diff

[Javal]

<div class='quotetop'>QUOTE (Gilly @ Dec 20 2007, 11:08 PM) </div>4.3 for T series are also common, but not standard for TE72 / TE71 / AE86 (JDM)....

...you'll find them in automatic celicas.

[riojin]

s series, 8 nuts.

so my guess is the needles that i bumped when opening up my cluster arent in the exact right spot. most likely the speedo. it doesnt look like its sitting as low as the tacho needle (meaning im speeding when i think im doing the speed limit). ill open her up when i can be bothered and fix it.

[Felix]

i sit at around 4000 revs at 100km

think i have either a 4.1 or 4.3 in my t series

[Jonny Rochester]

In 5th gear at 100km/h with 185/60R14 tyres, in theory means:

3091 rpm with 3.909:1 final drive
3242 rpm with 4.1:1 final drive
3401 rpm with 4.3:1 final drive
3717 rpm with 4.7:1 final drive

In 5th gear at 100km/h with 195/60R14 tyres, in theory means:

3029 rpm with 3.909:1 final drive
3177 rpm with 4.1:1 final drive
3332 rpm with 4.3:1 final drive
3641 rpm with 4.7:1 final drive