What did you do for your ZHP/ BMW / MINI today? #2

[az3579]

When was the last time you replaced your DISA?

I'm fairly certain he has recently serviced his DISA, as did I. We both still experienced power dips afterwards.
My dip went away after servicing, and then came back a few days later and it was about the same as it was before. I'm running it unplugged as well and so far, no dip.

[das boots]

I'm fairly certain he has recently serviced his DISA, as did I. We both still experienced power dips afterwards.
My dip went away after servicing, and then came back a few days later and it was about the same as it was before. I'm running it unplugged as well and so far, no dip.

I'm thinking more on future consequences of living them unplugged. As in what would be the effects on emission? Wouldn't the OBC get an input of them being unplugged? Smog test in Cali is so way different and stringent. The latest they got is that the tech would just plug them in and they do nothing. The machine would get all information and send to the DMV. Not able to manipulate and just get a readout if you pass or fail.

[az3579]

There are no check codes that get thrown when you unplug it. I'm fairly certain the DISA is not an emissions-related part, so I don't foresee any issues with CA's ridiculous emissions tests.

The software update practically disables the DISA (this is what I've been reading), so getting that software update from the dealer is pretty much the same thing the way I see it.

I'm thinking more on future consequences of living them unplugged. As in what would be the effects on emission? Wouldn't the OBC get an input of them being unplugged? Smog test in Cali is so way different and stringent. The latest they got is that the tech would just plug them in and they do nothing. The machine would get all information and send to the DMV. Not able to manipulate and just get a readout if you pass or fail.

[das boots]

Thanks. Although I am not having any problems with my DISA since it was replaced. Knock on wood. BTW, would cleaning the male and female plug help on your situation?

[Vas]

I personally would not disconnect the DISA valve. Reason being is that the DISA valve is what lets the intake manifold use both set of internal runners.

Below the activation point of 4k rpm, the shorter runners are used to push the air into the engine in the lower rpm range. When the DISA valves activates, the longer runners then are being used. The way I see it is that if you disconnect the DISA valve, the intake manifold will always be using the longer runners which in theory would result in a torque/power loss in the lower rpm range. Up top the car would feel the same.

[danewilson77]

Well after texting with BP last night I unplugged my DISA for the 50 mi run in to work today. The 2500-3500 lag is mostly gone. Not sure why or how b/c everyone says the DISA is all about 4k dip. Botond suggests I give it a few days and see if it returns.


Thumbs, iPhone, Tapatalk.

DISA fails open when unplugged (all intake runners in the loop)? Did you notice a difference in low end torque?

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[az3579]

I personally would not disconnect the DISA valve. Reason being is that the DISA valve is what lets the intake manifold use both set of internal runners.

Below the activation point of 4k rpm, the shorter runners are used to push the air into the engine in the lower rpm range. When the DISA valves activates, the longer runners then are being used. The way I see it is that if you disconnect the DISA valve, the intake manifold will always be using the longer runners which in theory would result in a torque/power loss in the lower rpm range. Up top the car would feel the same.

Yes, this is the side effect of getting the software update. Because the DISA gets disabled, lower-end torque suffers.
Honestly I haven't noticed too much of a difference. Our cars are slow anyway, so meh.

[danewilson77]

Yes, this is the side effect of getting the software update. Because the DISA gets disabled, lower-end torque suffers.
Honestly I haven't noticed too much of a difference. Our cars are slow anyway, so meh.

You kill me.

Sent from my Samsung Galaxy S6 Edge

[flyride]

Below the activation point of 4k rpm, the shorter runners are used to push the air into the engine in the lower rpm range. When the DISA valves activates, the longer runners then are being used. The way I see it is that if you disconnect the DISA valve, the intake manifold will always be using the longer runners which in theory would result in a torque/power loss in the lower rpm range. Up top the car would feel the same.

This. However if the DISA vacuum pot fails, the flap can get stuck open, closed or anything in between. Also if the cam wears the flap is free to move freely. DISA is not indexed to the SMOG monitors and the DME has no feedback on its state - hence no codes. You can run with it plugged in or unplugged - the only difference will be a (slight) difference in power at various RPMs.

[az3579]

This. However if the DISA vacuum pot fails, the flap can get stuck open, closed or anything in between. Also if the cam wears the flap is free to move freely. DISA is not indexed to the SMOG monitors and the DME has no feedback on its state - hence no codes. You can run with it plugged in or unplugged - the only difference will be a (slight) difference in power at various RPMs.

Thanks for the verification.