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+--- Thread: Actuator preload (/showthread.php?tid=9683)
Actuator preload - cwspellowe - 10-01-2013
Can anyone tell me how much preload a T2 actuator has, in terms of how many turns from it lining up with the wastegate flapper?
I feel i've not put enough preload on it as it's only 1.5 turns in, so the flap is only just held shut. My test drive tonight highlighted that I have a mere 3psi boost
Pretty sure when I had my T2, it took a bit of effort to get even the stock setting back onto the wastegate..
RE: Actuator preload - Ben Jay - 10-01-2013
wouldnt it be a case of trial an error with these things?
Re: Actuator preload - Dan! - 10-01-2013
You not running an mbc? :-S
RE: Actuator preload - cwspellowe - 10-01-2013
Yeah running an MBC but i've got a feeling there's nowhere near enough preload on the wastegate, so it's getting blown open by exhaust mani pressure...
RE: Actuator preload - parrotveasey81 - 10-01-2013
http://www.youtube.com/watch?v=p12g1PpIcjE
???
RE: Actuator preload - cwspellowe - 10-01-2013
Aye but that's a bit of a generalisation. Bear in mind i'm using a T2 actuator on a GT2056, a generic video of a guy saying three turns isn't exactly confidence inspiring...
RE: Actuator preload - Ruan - 10-01-2013
Lolz, that video is bull... 3 Turns is hardly a precise measurement when different spring rates, diapraghm sizes, wastegate port sizing etc etc comes into it..
RE: Actuator preload - cwspellowe - 10-01-2013
^^this
Also the fact i've ported the wastegate too. And yes it still seals properly before someone accuses me of destroying the wastegate
RE: Actuator preload - Ruan - 10-01-2013
Doesn't seal I bet.
Amateur.
RE: Actuator preload - strictly_perv - 10-01-2013
I could have a ganders at my spare stock T2 to give you a rough idea of where stock is?
RE: Actuator preload - cwspellowe - 10-01-2013
Yes please Max. Just watched Darren's tuning video on youtube, looks like there's a couple more turns than on mine, but don't know if that's a standard blower.
(10-01-2013, 09:48 PM)Ruan Wrote: Doesn't seal I bet.
Amateur.
f*ck OFF!
I have two spare hotsides anyway
RE: Actuator preload - strictly_perv - 10-01-2013
Darren...standard??? Be serious!
Yeah, I'll take a look/photo tomorrow for you.
RE: Actuator preload - cwspellowe - 10-01-2013
It looked like a scrap pile of standard blowers. First thing to be ripped off a project car
RE: Actuator preload - parrotveasey81 - 10-01-2013
(10-01-2013, 09:40 PM)cwspellowe Wrote: Aye but that's a bit of a generalisation. Bear in mind i'm using a T2 actuator on a GT2056, a generic video of a guy saying three turns isn't exactly confidence inspiring...
(10-01-2013, 09:46 PM)Ruan Wrote: Lolz, that video is bull... 3 Turns is hardly a precise measurement when different spring rates, diapraghm sizes, wastegate port sizing etc etc comes into it..
yep and thats why i put "???" below the vid
as with most things on the internet,take it with a pinch of salt
RE: Actuator preload - cwspellowe - 10-01-2013
Interesting... >>Clicky<<
I know it's not technically the same application, but "half a hole" preload, which is probably a turn more than I put on, is giving them ~8psi on a T2 actuator.
I'd expect much higher exhaust mani pressure than on a mini, so I may be right about the preload. Will get under it tomorrow and tighten things up, see if it makes a difference...