FourG63 97GST

So I want to add front wheel speed input for boost by speed boost control
how are you people accomplishing this

stevieturbo

Depends what controller you're using and what sort of signals etc it expects or wants.

But generally most will need some sort of "tooth" that a suitable sensor can see the rotation of the wheel. Or multiple teeth. If aftermarket brakes, the disc/rotor bolts are usually handy for that, or you could fab something up.

Or there might be some controller out there that could use a GPS speed reading.

Or the Cortex controller will get a reading from OBD, although that would be more a driven wheel speed, which is better than no speed at all...but undriven source would be preferable.

https://sirhclabs.com/

FourG63 97GST

it's for the Holley dominator, which can use hall effect or inductive type speed signal.
was mainly concerned about the physical adaption on a C5/6

Turpid porpoise

C5 Pete

I would bet this would work just fine.

stevieturbo

Certainly the trigger should be fine...not so sure the ABS system will be happy with you tagging onto the same sensor/wiring. Generally they're quite fussy about that

C5 Pete

Well, in my head, the ABS was disconnected. Not sure how the OP is set up...

stevieturbo

Well if the ABS is no longer in use ( which is a great safety feature ), then there should be no issues using the sensors for your new ecu.

FourG63 97GST

I still have ABS/Stability.
Guess i'll try burrow the signal and see what happens.

did you keep ABS?
how many wires did the haltech need, wondering If I can just take the signal or i'll have to wire a ground too

Turpid porpoise

I did not keep ABS, my car will see less than 100 street miles per year so I just put in a wilwood prop valves and ran custom bent hardlines to each caliper.

I used both wires for the Haltech setup, I don't know that it needed both but I had no reason not to use both.

stevieturbo

It is highly unlikely you'd get away with using a single wire, but it depends on the type of sensor the car is using.

If it was a simple 3 wire hall, then you might be able to do that, but that would be the only case.

And for all sensors, there is a dedicated sensor ground via the ecu. Never connect this to chassis ground.

Ronnie_W

I use the Cortex for boost by gear. It uses the speed and RPM signals to determine the gear. You can then set up boost by RPM in each gear.

stevieturbo

Boost by speed.

Boost by driven speed

Boost by gear...

They all sound similar, but they're not quite the same thing

And if you use boost by driven speed which is what Cortex will take from the OBD port....if that speed was to rise and you also have boost rise with it, that will of course have an unwanted effect on boost when you lose traction, as last thing you want is more boost in that scenario.

Although if you were boost by gear only, then that scenario wouldnt be a concern. But for the money, and feature wise the Cortex looks like a great unit.

Ronnie_W

You can have a max boost set up for each gear and it will not go above that. The wastegate will open up at max boost and it will drop down. Can't remember all of this. I've been down a while and haven't finished tuning the Cortex. Learning each time I take it out and send the log back to Chris at Cortex for him to critique it and give me suggestions. His help is invaluable and he don't mind helping.