loosing boost

[stevie69]

when i first floor my car i get 1.2bar but it falls down to 0.8bar.iv just remembered a while ago i took the pipe of the actuator and i didnt get any more boost and it took about 20 turns on the arm to get 1.2.is my actuator knackered?an if it is how much are they and are they easy to fit?cheers..

[cameron]

Not sure what they cost :(

But its a bit of a pig to change, easiest way is get on top of the engine its down the back :B_thumb:

PM Rufe on here he'll give you a good price on a new one :D

[stevie69]

thanks for the quick reply.youve got a 304 havent you?mine boosts of the white bit by about 3mm then drops to about 3mm under the white.does yours stay of the scale?

[cameron]

Off the scale all the time the foots on the floor :B_thumb:

When i got the 304 done Hamish adjusted the actuator for me, only about 3 or 4 turns.

The amount you quote sounds excessive unless its been messed about with :(

[Saaamon]

Think there about £150 + vat RRP. RT can get hold of them for you aswell.

[stevie69]

looks like itll have to wait until i win the lottery then..

[cameron]

2nd hand an option ?

Plenty of 850 T5's being broke on ebay ;)

http://cgi.ebay.co.uk/Volvo-850-T5-Turbo-wheel-bolt-Complete-Car-Breaking_W0QQitemZ320355325586QQcmdZViewItemQQptZU K_CarsParts_Vehicles_CarParts_SM?hash=item32035532 5586&_trksid=p3286.c0.m14&_trkparms=72%3A1689%7C66%3A2%7C65%3A12%7C39%3A1%7C 240%3A1318

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[BruceT]

20 turns on the actuator?

http://au.geocities.com/ozbrick850/engine-wastegate-adjustment.html

Please read this, increasing the turns on the actuator will not increase boost per say...

It will, however build boost faster... ie in your case giving the "leak" less time to vent the boost... but once the turbo has spun its nads off and the BCS/MBC has seen "stock boost" it try and maintain it, thus flow reduces and then the air can escape quicker.

[stevie69]

iv got an mbc on it aswell and its wound right in.you think iv got a major leak?

[850twr]

my car boosts to the end of the white untill 5k rpm, then drops to about 2 thirds up to the redline. i thought this was normal for a 15g, and hence the apeal of a 19t?

as for your mbc, mines a bleeder and im getting a bar with just 3/4 of a turn. i would say look into leaks rather than the actuator.