are all jdm ecu's limited to 120mph?

 

As for all JDM�@ECU, the speed limiter operates by 180kmh. The Japanese is
yearning to the limiter cutting.

 

Yes, every car made in japan is restricted to 190kmph (it supposed to be 180kmh but every JDM car i've ever been in has gone on to 190kmh which is 119mph) , even skylines, buts its a fairly simple task to by pass it

 

yeah - on a dyno run hte guy put it in fifth,

and it kept cutting out at about 7000...

"mate! - it's programed to cut out at 180"

"what! why?"

"well, it's from Japan..."

"%#& Japs - always spoiling our fun!"

yeah, i guess...

t..

 

If he put in fifth and reved to 7000rpm then that would be over 135mph, so it cant have been restricted!!!

 

are you refering to any paricular gearbox?

mine?

i think not.

i have a S1 which has a 4.4 FD ratio and a fifth gear which is 0.906

which at 7000rpm with 205/45R16 wheels = 195km/h

so i calculated that it would have been clser to 6450RPM whre it was cutting out - but i was close.

anyways the calculation for your information is:

Speed(Km/h) = (RPMM/(Rendd*Rgear))*(((Vd*2.54)+(2*(BmCC*(Bp/100))))*pi)*0.0006

RPMM= RPM in thousand's

Rendd= Final drive ratio

Rgear= Gear ratio of the specific gear

Vd= Rimm diameter ( 14", 15" or 16" etc )

BmCC= Tire measurement in centimeters ( 18.5 or 19.5 etc)

Bp= Tire thickness (profile) ( 55 of 50 )

pi= The nice scientific number from about 3.1416


HTH,

t..

 

PS i do about 4000 rpm at 110km/h on freeways and am in VTEC at 140km/h

(which sux a bit, but is good for passing)

t..