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**arfur fox-acre** · 19 April 2018, 05:03 PM

Smart van, comfy carpet and a trusty hound.....what more could a man need?

**regcheeseman** · 19 April 2018, 11:11 PM

Why is your boost line plumbed direct to the wastegate actuator?

**Activ8** · 20 April 2018, 12:08 AM

Originally posted by regcheeseman View Post

Why is your boost line plumbed direct to the wastegate actuator?

It's fitted with a 20 psi actuator of course.

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**Pavs** · 20 April 2018, 08:52 AM

Originally posted by regcheeseman View Post

Why is your boost line plumbed direct to the wastegate actuator?

Thats the way it came? I am doing it wrong?

**regcheeseman** · 20 April 2018, 10:17 AM

Originally posted by Pavs View Post

Thats the way it came? I am doing it wrong?

yes. you need to set the actuator fairly light and use a boost controller to get a better response.

Only a complete idiot would set a wastegate up with loads of preload.......

**Pavs** · 20 April 2018, 11:30 AM

Originally posted by regcheeseman View Post

yes. you need to set the actuator fairly light and use a boost controller to get a better response.

Only a complete idiot would set a wastegate up with loads of preload.......

So if I fit a manual boost controller in the line from the waste gate to the turbo housing?[emoji47]

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**Pavs** · 20 April 2018, 08:50 PM

Well after all the hard work, time to put all to good use.

And there's a t4 just opposite [emoji2]

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**Activ8** · 20 April 2018, 09:57 PM

Originally posted by regcheeseman View Post

yes. you need to set the actuator fairly light and use a boost controller to get a better response.

Only a complete idiot would set a wastegate up with loads of preload.......

With a K14 and no boost controller I found 5mm / 5 full turns of pre-load on my actuator made 1 bar of boost (3mm is standard) that's plenty on these turbos.

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**regcheeseman** · 20 April 2018, 10:55 PM

Originally posted by Activ8 View Post

With a K14 and no boost controller I found 5mm / 5 full turns of pre-load on my actuator made 1 bar of boost (3mm is standard) that's plenty on these turbos.

Yeah - but the response is far too harsh - the resultant spikes wreck motors and turbos.

**Activ8** · 21 April 2018, 08:44 AM

Originally posted by regcheeseman View Post

Yeah - but the response is far too harsh - the resultant spikes wreck motors and turbos.

Surely the preload is the unchangeable spring setting on a K14 to match the N75 map? Tightening the actuator rod simply limits the rod / wastegate arm movement and therefore the amount the wastegate door opens. Less pressure is lost because of the limited opening? On my old K14 actuator 5 turns held boost at 1 bar on a K14 but it still started to open at 0.4bar ish... rising to 1 bar.

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**regcheeseman** · 21 April 2018, 11:41 PM

Originally posted by Activ8 View Post

Surely the preload is the unchangeable spring setting on a K14 to match the N75 map? Tightening the actuator rod simply limits the rod / wastegate arm movement and therefore the amount the wastegate door opens. Less pressure is lost because of the limited opening? On my old K14 actuator 5 turns held boost at 1 bar on a K14 but it still started to open at 0.4bar ish... rising to 1 bar.

Sent from my SM-G901F using Just T4s

No, preload is exactly that. the more you wind in, the more pressure is required to overcome the extra preload.

Spring rate is a constant but more pressure is required to start movement as it has to overcome the preload.