Speedometer broke and check engine light

[decryphe]

(08-20-2026 09:39 PM)banpei Wrote:  .. the 180km/h limiter ...

I'm quite certain I've gone faster than that with my Japanese car and did not experience a fuel cut or anything. Certainly the needle on the dash has gone way past the end of the scale.

[banpei]

(Yesterday 12:13 AM)sheppardpat47 Wrote:  Thanks, do you know by any chance if it could also be the sensor on the gearbox that could be faulty or they don't break that often? I have no idea, I bought a cable (and fuel pump + filter, I want to replace it anyway and all the fuel lines)

There is no sensor on the gearbox, it's just a cable going to the cabin. There is one other possibility, and that's the small plastic gear inside the gearbox that's worn out. But 95% of the time, it's the speedometer cable that's broken.
This is the replacement gear:
https://flos.ie/store/speedometer-gear-t...13105b7e4e

(Yesterday 01:45 PM)decryphe Wrote:  

(08-20-2026 09:39 PM)banpei Wrote:  .. the 180km/h limiter ...

I'm quite certain I've gone faster than that with my Japanese car and did not experience a fuel cut or anything. Certainly the needle on the dash has gone way past the end of the scale.

Mine went further as well (even though it was about 165 on GPS), but there are cases where the ECU cuts out above 180km/h. Maybe that was only present on the kouki versions?

[sheppardpat47]

(Yesterday 02:36 PM)banpei Wrote:  There is no sensor on the gearbox, it's just a cable going to the cabin. There is one other possibility, and that's the small plastic gear inside the gearbox that's worn out. But 95% of the time, it's the speedometer cable that's broken.

Good then I bought the cable, I hope it'll fix it! I know that the cable started making the needle "wiggle" a bit on lower speeds.

(08-20-2026 09:39 PM)banpei Wrote:  but there are cases where the ECU cuts out above 180km/h. Maybe that was only present on the kouki versions?

Actually, mine cut at 194km/h GPS speed ! It was quite scary since it literally cut the fuel at that speed, it didn't go to the rev limiter.



I did this last year when I was on the autobahn, after driving on the Nürburgring.

[banpei]

That's quite interesting.
Actually, there is an interview in a 1990s book (the AE86 book) with one of the engineers who worked on the AE86. In that interview, he states that they calculated the live axle to become unsafe at speeds around 200km/h and they made the car top out at 190 with cat and 195 without. Now the interview doesn't say how they achieved that. But given that with a stock final drive (4.778 ) and gearbox (T50), the AE86 should theoretically top out at 210km/h at 7800rpm, it would suggest Toyota made sure you couldn't reach those speeds.

[sheppardpat47]

(Yesterday 10:08 PM)banpei Wrote:  That's quite interesting.
Actually, there is an interview in a 1990s book (the AE86 book) with one of the engineers who worked on the AE86. In that interview, he states that they calculated the live axle to become unsafe at speeds around 200km/h and they made the car top out at 190 with cat and 195 without. Now the interview doesn't say how they achieved that. But given that with a stock final drive (4.778 ) and gearbox (T50), the AE86 should theoretically top out at 210km/h at 7800rpm, it would suggest Toyota made sure you couldn't reach those speeds.

To be honest, I wouldn't like to be in a car crash (even at low speed) with an AE86, it's literally a tin can. Do you remember that Chinese crash video of that stupid Volkswagen driver crashing into a red 3 door Levin in a touge?
https://youtu.be/I-hiKWAaOLU?list=PLCV0Z...tn5aczWzLz

[The Doctor]

(Yesterday 10:08 PM)banpei Wrote:  That's quite interesting.
Actually, there is an interview in a 1990s book (the AE86 book) with one of the engineers who worked on the AE86. In that interview, he states that they calculated the live axle to become unsafe at speeds around 200km/h and they made the car top out at 190 with cat and 195 without. Now the interview doesn't say how they achieved that. But given that with a stock final drive (4.778 ) and gearbox (T50), the AE86 should theoretically top out at 210km/h at 7800rpm, it would suggest Toyota made sure you couldn't reach those speeds.

My guess would be that they specced the gearing the way that it doesn't have enough hp to get to the revlimiter in 5th. The drag is simply to high for the 4age to overcome.