Relationship between auto and DSC

[Shane]

Hi,

 

Can someone just confirm to me the effect that naff pulses back to the ecu from a crap DSC may have on:

 

Torque convertor lock speed and maybe erratic change at high speed?

 

I suspect that if the ECU sees pulses that are divided by 5/8 that it will not only effect other stuff like steering, spoiler etc, but also screws up the auto shifting. Anybody know for sure? The correct way of doing this is I believe to feed the ecu with exactly the correct info it would normally get up to about 175kmh and then clamp it at that point, while continuing to provide the odo, speedo etc with the scaled output. I guess this is the way the proper ones do it. There is a lot about it on the Peter Betts site but it doesn't answer my questions.

 

Please dont tell me how good the Thor DSC is, I know!

 

Just want to confirm my suspicions regarding the effect of a scaled signal would have on the auto side of things.

[Ian C]

Yes

 

-Ian

[Shane]

Thanks Ian.

 

Have you come across this before then?

[Matt Harwood]

I think most of us have. Which is why Thor's one gets talked about a lot, because that's exactly what it does. 5/8ths pulses to the speedo, and 1:1 to the ECU clamped at around 110mph.

[Shane]

Thanks Matt,

 

Although I was pretty sure it was the crap DSC causing me the probs at the weekend, I was a little concerned as until recentley when I fitted the crap thing I had never got passed the restrictor speed so was worried that I may have a transmission problem.

 

I work with pic proccessors quite a bit so will make my own version when I get a chance to take the scope out in the car. I bought the crap one just to see what they were using as it is just covered in heatshrink so the components are identifiable.

 

Thanks again, Shane

[Ian C]

That's cool if you build your own And knock them out for members for less than £70

 

-Ian