External wastegate help needed!!
 

Ok just started the car with the new tubular manifold (it has a blow hole somewhere:furious ) and ext wastegate setup and the wastegate leaks. i then realised i hadnt got the boost signal pipe connected (Doh!) but having jsut read the instructions that came with it, im confused. see pic of wastegate and pic of instructions.
http://i13.photobucket.com/albums/a2...1/DSCF0967.jpg
http://i13.photobucket.com/albums/a2..._50_17_OCR.jpg
if im reading these instructions right (and im probably not!) the bottom connection of the wastegate needs a 6mm bore feed from a boost pressure source BEFORE the throttle body. now that could be anywhere from the compressor housing takeoff all the way to the TB intake itself so long as its before the actual butterfly and not IN the inlet manifold itself?
If i wish to run at whatever boost level the wastegate is set at, i use a direct pipe and leave the top fitting open to atmosphere?
But if i wish to alter the boost level with a boost solenoid (i do...), then i 'T' off from the 6mm pipe to the bottom one, and put the boost solenoid between the 'T' and the top wastegate connector, yes?

sorry for being thick, but ive put around 80 hours into the car in the last week alone and the brains fried.

i have the bottom nipple on the wastegate plumbed directly to my turbo compressor housing and i use a 15psi wastegate spring. I dont use a boost controller at all and i just run 15psi

I have a 7psi spring that i had installed before with my blitz boost controller. that was plumbed in exactly as you described. using the top nipple as a spring gain. Best bet is to run it without anything on the top of the wastegate at all and plant your foot slowly and check that your spring rate is what you asked for as if its from ebay you can sometimes be entered into the spring lucky dip


Whys the wastegate leaking. Did you get a machined washer that sits inside the wastegate flange on the wastegate and a gasket togobetween the two flanges?

Cheers Pukka, thats pretty well what i thought, just the caffiene was wearing thin and needed someone to point me in the right direction.
God knows what springs in there, it should be 7psi iirc.
where can i buy alternative springs?
thanks again:)

oh and the leaking was just at idle it was chuffing past the valve itself rather than a leak because id got it plumbed to a vacuum pipe so it was opening a little, closed fine when throttle opened a bit.
me being a dumbass...:rolleyes:

yep steel machined ring in between manifold flange and wastegate, no gasket. is that right?

i got supplied 2 gaskets with my wastegate,one for the manifold flange and one for the screamer flange. if you have really well machined flanges im sure high temp sillicon would be fine. Its upto you. I have seen both the gaskets and springs available from ebay usa and there still very cheap with postage:)

them gaskets are shite, i used blue hylomer.

im not using a gasket at all between the wastegate and manifold flange, just the machined steel ring and it doesnt seem to blow. the gaskets are a bit shite, think hylomar is a good shout from wastegate to screamer

it doesn't burn off, it just turns black and gooy, and it comes off with thinners, but seals it good, i used for 2 years,;)

cheers, good tip:)

one thing guys, in the diagram it shows another T as a vent to atmosphere in line with the boost solenoid. Did you do this too? or just not bother with the vent to atmos?

I didnt have a vent in mine there. if it had a vent there there would not be any point in having the controller attached to the top port.I would Leave the vent out. Just be careful as im sure you will when you first test it.Get a nice big boost gauge right in front of your face in 1psi increments:D

im off to emerald in norfolk at 530am tomorrow so hopefully itll all be ok. i have put the vent in, so will take it out when i get there. cheers again for the help.:)

thanks by the way Pukka, i left the vent out and the wastegate worked fine. cheers :)

on my greddy profec b spec 2, the solenoid has 3 ports, you alter the way the pipes attach, for if you have ex wastegate or actuator, if you have your set up ie: external, you run the pipes parralell and the center one vent to atmosphere, top of the actuator goes to (com) on the selonoid which is the one thats on the side and runs parralell to the other, the other one that runs parralell goes to a pressure source ie: the comp housing on the tubby, you also t into this one and connect it to the bottom opening on the wastegate,then the front of the solenoid vent to atmosphere.;)

good work fella! :)