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Turbosmart Iwg75 & Over Boosting


Serangan
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  • Member For: 9y 2d
  • Gender: Male
  • Location: Hobart, Tasmania

Hi Guys, I need of a bit of help here.

First up, car is tune for this actuator.

Actuator is a Turbo Smart IWG75 with a 12 pound spring.

Was running at 15 psi of boost for a few months, then it's started boost cutting at 20+ psi. In an attempt to find out what is wrong, I tried bypassing the stock electronic boost controller and expected to see roughly 12psi of boost but I didn't, it kept boosting till the gauge hit 20psi and then the ecu cut in and went into a limp mode.

Skipping forward. Today I took the turbo out to see what if the waste gate actuator is at fault.

Turns out I can't move it by hand, not sure if this is normal or not?

When I connect a hand pump to it, it moves.

Following this I connected it to a bike pump and set the pressure to 5psi, actuator moved.

Tried again at 12psi moved further but wasn't fully extended.

Kept upping the pressure up by 2psi until it reached the max extent, turned out to max out at 22psi.

Is this normal? Shouldn't it be fully extended by 12psi?

Thanks

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  • ...JD TUNING ADELAIDE...
  • Gold Donating Members
  • Member For: 14y 3m 24d
  • Gender: Male
  • Location: Adelaide

These actuators are "heavy" and need far less pre load than a typical actuator, this is a bit of a skill coupled with D/C to get right

We got it right, many dont and blame the actuator

Yes its "harder" to set up but thems the brakes

We ended up steering away from them due to other issues that turbosmart came to the party with but couldn't be arsed dealing with it ever again

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  • Bronze Donating Members
  • Member For: 8y 9m 21d
  • Gender: Male
  • Location: Rockhampton Qld

I couldn't move my turbosmart12lbs by hand but got called a soft cock by jet haha.

Might have a bit to much preloaded on it.

I set my preloaded on mine to hard coz I didn't read the instructions and it was hitting 20lbs way to early for stock bottom end. Tuner backed it off a bit and now runs mint.

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  • Member For: 9y 2d
  • Gender: Male
  • Location: Hobart, Tasmania

Cheers guys. I won't worry about not being able to move it by hand then...

I did check the preload while I had it off (still do actually) and it was set on a lot harder than what was suggested on a topic on this site, can't find it anymore. But it suggested having it 3 full turns on. This has reduced the preload now - yes I understand ill need a retune for this.

But this unfortunately doesn't explain why it randomly started over boosting

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  • Member For: 9y 2d
  • Gender: Male
  • Location: Hobart, Tasmania

Im merely stating a fact. I've read your tuning thread and do understand that you know what you're doing. But 2mm is a start and is a lot less preload than it originally had

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