blacktop speed cut removal

[gleem]

have searched but found conflicting info. Want to remove the speed limiter on bzg, With out buying an extra computer etc

Can some one send me a link for this.

Thanks

[sergei]

viewtopic.php?p=193178&#193178
you can thank fivebob.

[gleem]

ok thanks. so on a 20v thers the wire going into the ecu. Also they mention you can to it to a wire that goes to the speedo. this would more suite my plans. Is it the same colour

[fivebob]

It's not really a good idea to modify the signal going to the speedo as it will cause it to read 1/2 of the speed you're actually doing and possibly cause problems with other systems that use the speed input, though I'm not sure if there are any other things that use the speed signal on a 20v.

It's better to modify the signal that's going to the ECU as that won't affect anything else.

[mr30%jr]

hmmm i have heaps of cheap cellphone car chargers with little 5v regulators i could strip if anyone wants me to build these.

car charger is going to be about 5 bucks and i dont know how much the IC is. i would charge maybe 5 bucks to assemble and 5 bucks to ship

[Mr Revhead]

It's not really a good idea to modify the signal going to the speedo as it will cause it to read 1/2 of the speed you're actually doing and possibly cause problems with other systems that use the speed input, though I'm not sure if there are any other things that use the speed signal on a 20v.

It's better to modify the signal that's going to the ECU as that won't affect anything else.

I have seen an AE111 20v with a switch to the speedo that switches it off. Disables speedcut. As well as speedo and odometer
Doesn't affect anything else on that car.

[mr30%jr]

It's not really a good idea to modify the signal going to the speedo as it will cause it to read 1/2 of the speed you're actually doing and possibly cause problems with other systems that use the speed input, though I'm not sure if there are any other things that use the speed signal on a 20v.

It's better to modify the signal that's going to the ECU as that won't affect anything else.

I have seen an AE111 20v with a switch to the speedo that switches it off. Disables speedcut. As well as speedo and odometer
Doesn't affect anything else on that car.

your dead right it dont

pre 92ish used mechanical speedo then a speed sensor in dash then to ECU

after that they used a pick up screwed to the gearbox and electric everything so both connected to that. so you could just cut the dash signal and the ecu is happy as larry..

this is what people do on diesels to get round RUC

but this shouldnt disable speed cut, it would still throw a check light with no speed signal over a certain amount of revs for a certain period

i havent had any evedence it actually "limps" at all

[gleem]

hmmm i have heaps of cheap cellphone car chargers with little 5v regulators i could strip if anyone wants me to build these.

car charger is going to be about 5 bucks and i dont know how much the IC is. i would charge maybe 5 bucks to assemble and 5 bucks to ship

Sorry dont understand what you are planning

[Rick]

You already have 5v supply at the ECU

[captain crescent]

the five bob way works on my car it realy good.... if you need someone to make one i could probly do one for you. all you would have to do is wire it up to the ecu

[matt dunn]

after that they used a pick up screwed to the gearbox and electric everything so both connected to that.

Right but not 100% right.


the sender in the gearbox is connected to the dash speedo only,
the speedo converts the signal an bit and outputs it to the ECU.

Disabling the input to the speedo stops the speed cut
as no input = no output

Yes you do get a check engine light, but there are no limp mode symptoms as such. earlier versions used to stall at a sudden stop with no signal at all.

On the Carib's it also affects the weather and direction display if it has one.

[AE25]

disabling speed signal also reduces rev limit. is about 500rpm difference. well it does in my ST 20v anyway. is this a neutral gear rev limiter safety feature? thought it might be at the time. or some form of limp mode?

im using ae101 20v and box in ae82, wired up so everything works incl diagnostics plug. car has mech speedo so had to remove digi speedo sensor and run mech speedo drive. have used the 110k tinker bell switching mechanism in the speedo gauge to give a digi on/off signal to ecu 'spd' pin. when driving with it connected i have rev limiter to 7700rpm. disconnected limiter is 7300rpm. it works, it cost nuthing but time.
but do digi speedo dash have a 110k tinker bell?
im close to losing licence from demerits.... not testing speed limiter in practise anytime soon. could put speedo drive in an electric drill and spin it up past 180k on the gauge with engine running to see if i have a speed limiter with this setup...
i figure... ecu must somehow count frequency of spd signal to determine actual speed for speed limiter. if you can drop this frequency down.. you'll effectively raise speed limiter. (theorically speaking).
by cutting signal to ecu altogether.. you decrease rpm limiter.. if Blacktop 20v actually has this same feature.. you lose the best part of a 20v.
the trick box 555 circuit or $5 I/C sounds good.
$200 speed cut defender??? how can someone justify that!