RDLperformance
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Posts posted by RDLperformance
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18 hours ago, Adamw said:
In rally cars you generally want much less lock in the diff during braking as you want to be able to semi-lock the rear wheels without affecting the front wheels, typically same for hand brake also. In road race cars you typically dont need to change the torque split during braking unless it is messing with your brake bias.
The DHB is basically a solid state relay, so the ecu is sending a low current PWM to the DHB, the DHB is connected directly to the diff, just like how you would control a fuel pump etc.
Vaughan's option above is a nice way to do it. But your original plan will work too - you just need to put the output DC parameter from the 2nd table on the axis. For example if GP PWM2 table is assigned to CAN aux 1, then you put CAN aux 1 on your 1st table axis, not GP PWM2.
Example below pressing brake:
Perfect! ill give both options a try next week, booya!
1 hour ago, Adamw said:You would have to something like the above examples to lock the diff for launch as you would need 100% DC. The unlock for handbrake slide could just be done via the conditions on the GP PWM.
You dont need to reinvent the wheel, a common solidstate relay like the Hella H41773001 or the Holley 15620 would drive it fine, Im pretty sure they only pull about 5A.
Note, the good diff controllers dont just use a fixed PWM, they do a closed loop current control which gives more consistent torque split as the diff temperature varies. We are developing an accessory that will be capable of doing constant current via CAN from the ECU this but it is a little while off yet. I was hoping to get some sort of proper diff control strategy in G4X when we have that device closer.
Interestingly,most other solid state relays dont last, hence we have gone to motec.... expensive but doesnt stop mid rally;).
I assume you are talking about a solid state relay like the Kaizan? i am pretty keen to try it for diff control over CAN....
Ps, yes please to the diff strategies!!!!
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Hi all, I run the electronic center diff control off the g4x, 6 speed sti subaru box, via a motec half bridge.
Currently i can only have one map as per pic and just use the 0 app line for braking lock. i would like to run a seperate table for braking activated by the stop light switch to account for left foot braking. I have tryed a couple of options with a second table GP PWM2. It operates on that table but wont transfer that to the first table when i set gp pwm2 as the axis.
Anyone got a better plan????
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Awesome, thanks mate. Bumped up vvt solenoids to 250 and that fixed vvt. The vvl seems to have responded to the vvt being correct to the target and is operating perfectly now as well.
I did do the cam angle test yesterday( it was 0.5-1 degree off what it was when we built the engine) that never helped the cars problems tho
Thanks for the help!
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This is vvl problem,but the acvs seems lazy as well. We are just redoing the connectors etc at the moment.
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Subaru ez30 and the vtec is coming up as a fault, especially at low revs. The vvt is working but possibly a little lazy at times. Has oil pressure, have replaced the cam sensors, vvt solenoids.
does anyone know what the parameters are for the vtec to have a fault? The only parameter I can see is an rpm on point.
Subaru diff control
in G4x
Posted
Gotcha, Actually failed to read your whole comment,duh. A pdm (obviously more expensive) that does PWM would be able to set up with that type of strategy. Interesting... I might have to experiment...