bluedrag Posted October 28, 2013 Share Posted October 28, 2013 hey guys just after some opinions on what size wastegate i should be using for my NA-T build, only wanting to run 8-10 psi at most and currently im overboosting to 15psi at 5000rpm any ideas or suggestions? im currently running a 38mm external gate but do you think that is big enough? any help is appreciated =) Quote Link to comment Share on other sites More sharing options...
Rich.2211 Posted October 28, 2013 Share Posted October 28, 2013 Is it a four bolt style wastegate? I think HKS do a 50mm in that fitment. Quote Link to comment Share on other sites More sharing options...
bluedrag Posted October 28, 2013 Author Share Posted October 28, 2013 hi Rich, yes its 4 bolt style, ill look into the hks Quote Link to comment Share on other sites More sharing options...
FOSTA Posted October 28, 2013 Share Posted October 28, 2013 Is it a hks copy? as I had one and mine was also overboosting! I only found out mine was doing it the day before I was due for mapping so I had to miss that day and I orded a pw46 46mm precision wastegate and its perfect! It's not the size it's the cheap copy stick slightly! I took the piston out of mine to inspect and clean and I noticed the shaft was ever so slightly bent. Not sure if it was a manufacture fault or weather the cheep metal couldn't take the heat? But up to now I'm the only person that has seem to have that problem, but if you do do then this makes 2 of us. Good luck and I hope you get sorted dude Quote Link to comment Share on other sites More sharing options...
Rich.2211 Posted October 28, 2013 Share Posted October 28, 2013 How did you go about fitting it Fosta? Did you buy a 4 bolt to V Band adapter? Quote Link to comment Share on other sites More sharing options...
mellonman Posted October 28, 2013 Share Posted October 28, 2013 have you thought about changing to a lower psi spring? Quote Link to comment Share on other sites More sharing options...
FOSTA Posted October 28, 2013 Share Posted October 28, 2013 How did you go about fitting it Fosta? Did you buy a 4 bolt to V Band adapter? What I done was take the 4bolt plate that has the seal for the wastegate piston top and welded a v-band to that. So it just bolted to the manifold like before and then the clamp when on the v-band. Quote Link to comment Share on other sites More sharing options...
berg Posted October 28, 2013 Share Posted October 28, 2013 Exactly what ill be doing over winter, think my "hks" wastegate is faulty already lol Does it need to go back to the mappers for any tweeks if i go from the crappy 4 bolt to a 46mm precision with the same spring rate? Quote Link to comment Share on other sites More sharing options...
bluedrag Posted October 30, 2013 Author Share Posted October 30, 2013 i will try with a friends wastegate maybe then and see if the beter gate makes a difference as it is more than likely some cheap ass chinese copy (no offence to any chinese people) if that wokrs ill either have to buy his spare or fork out for a decent one myself, thanks for the help guys will keep you posted Quote Link to comment Share on other sites More sharing options...
mellonman Posted October 30, 2013 Share Posted October 30, 2013 are you sure that the wastegate doesnt have a 14psi spring ? Quote Link to comment Share on other sites More sharing options...
bluedrag Posted October 30, 2013 Author Share Posted October 30, 2013 nope im positive it has a 7psi spring changed it myself from the 9 psi one that it came with Quote Link to comment Share on other sites More sharing options...
mellonman Posted October 30, 2013 Share Posted October 30, 2013 okay then, only a couple of things it can be , have you checked the vac pipes for splits ? what boost controler do you have ? if you do plumb the waste gate straight to boost referance to make sure its not the boost controler . there are a couple of ways to add a boost controler to a wastegate try another way if bypassing the boost controler works . last of all get a new waste gate Quote Link to comment Share on other sites More sharing options...
Krister Posted October 30, 2013 Share Posted October 30, 2013 (edited) 38mm should be fine.. but I'd also look at the flow to the gate as well.. How does the turn to the wastegate look like? In some china manifolds there's a lot of material you can remove to make the exhaust flow better. Also like above, first run just the boost source to the bottom of the wastegate and see if you still over boost to make sure it's not the boost controller. Then test with some compressed air with a gauge to see where the waste gate really opens so that you dont have a stiff spring in there and make sure the travel of the valve is good and it's not sticking.. If those do not help, you might have to fit a bigger 44-46mm wastegate and at the same time port the manifold. Edited October 30, 2013 by Krister (see edit history) Quote Link to comment Share on other sites More sharing options...
bluedrag Posted November 1, 2013 Author Share Posted November 1, 2013 ok well ive tried running vac lines to both top and side of wastegate and neither made any difference and i also tried with the boost controller out of the vac lines altogether, someone suggested that i try restricting the exhaust and hoping the the resulting back pressure slows the turbine because it cant get the waste out fast enough? any thoughts on this idea? Quote Link to comment Share on other sites More sharing options...
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