Mac Valve

[scotty nm35]

I am in the process of installing my GTX3071, im running a turbosmart 45mm gate and was looking to upgrade the blitz dual solenoids with a MAC valve to help hold boost.

Will the blitz unit run it ok? I have read it may need a diode across the wires to stop back emf spiking. Anyone upgraded a boost controller in this way?

Thanks.

[GTScotT]

Need more info on said mac valve.

You will probably find there wont be many people with hands on experience, but with enough detail those of us with good electronics knowledge may be able to somewhat answer/provide insight.

[scotty nm35]

It is just a no/nc air switch, to keep pressure on the spring side of the wastgate until boost, when the solenoid is energised and the pressure swaps ends to open the wastegate. There were a few people running them with link ecu's when I did a search but I need to know if the Blitz DS will work. As its only one coil instead of two it should I guess.

[GTScotT]

You are talking about a very small component to create back EMF, however I don't see the harm in using a diode either. Your concern should be load on the EBC should you be planning to run it on the same circuit. Normally running a relay to control it would alleviate any concern. Ive used standard relays to fix alarms that detect EMF for arming when using a turbo timer.

Are you concerned about WG creep?

[rob82]

Measure the impeadance of boh valves and if they are similar ie - within 50% of each other give it a crack.

[rob82]

You are talking about a very small component to create back EMF, however I don't see the harm in using a diode either. Your concern should be load on the EBC should you be planning to run it on the same circuit. Normally running a relay to control it would alleviate any concern. Ive used standard relays to fix alarms that detect EMF for arming when using a turbo timer.

Are you concerned about WG creep?

I beleive he was talk about back EMF off the solenoid creating voltage spikes on the driver. They will have most likely account for a fair amount of flyback votlage - I wouldn't be too concerned. Like I said just compare the impeadances of both solenoids.

[scotty nm35]

You are talking about a very small component to create back EMF, however I don't see the harm in using a diode either. Your concern should be load on the EBC should you be planning to run it on the same circuit. Normally running a relay to control it would alleviate any concern. Ive used standard relays to fix alarms that detect EMF for arming when using a turbo timer.

Are you concerned about WG creep?

I hope to run fairly high boost occasionally, not sure how the Turbosmart will cope with 25-30 psi as the heaviest springs are 1 bar. With the MAC valve I will definitely have no issues. Don't people usually run these for high boost? Why are the wastegates fitted with two ports otherwise?

I don't think the Blitz will have a fit as it already has to deal with its normal twin solenoids and the spiking they cause. I had a look inside the solenoid box a while back but I cant remember if the coils had diodes across them, perhaps I should start there.

Thanks guys.

[scotty nm35]

I was thinking if the Blitz can't control it very well, perhaps the Emanage can? I'm pretty sure you can set up any pwm output you like and map it off the boost sensor right?

Here are some pics of the install so far.

[Adriano]

I have a small and large mac valve which i can measure for you if you are interested, were you thinking of running a small one or a large port one?

[scotty nm35]

I have a small and large mac valve which i can measure for you if you are interested, were you thinking of running a small one or a large port one?

This is the one I have, just waiting on a 12v coil for it. My tuner has said to just try the standard Blitz solenoids first and see what the boost control is like.

[scotty nm35]

Heres a diagram of one way to set it up.

Found the Turbosmart PDF's, when I look at the 45mm it shows 4 different ways to set it up.

http://www.turbosmartonline.com/index.php?s=downloads