Okay so I just got a new top mount. The top mount has a 44mm vband flange for the wastegate. I currently have a tial 38mm 2 bolt wastegate. Are there adapters I can get to make this work? or what can i do?

 

cut the flange off and weld a new one on

 

on the top mount?

 

Where else would it be?

 

yes i am an idiot...realized that right after i posted it

 

wait since its a 44mm opening on the top mount...wouldn't that be too big to get welded onto a 38mm flange?

 

I have a 38mm flange in my hand right now. just measured it with a caliper. inside diameter is 38mm, outside diameter is 49mm.
sooooo, it would depend on the outside diameter of the pipe that the flange is connected to. as long as the pipe is 49mm or less outside diameter, it can be welded to it with no worries and would fit perfectly fine

 

A 38mm wastegate is NOT going to work on that manifold. Sell the wastegate and buy larger. Generally most manifold designs do NOT give the wastegate priority which would allow a single 38mm to keep up but they are all almost a 90 degree turn so you need a larger wastegate to bleed off enough exhaust gasses otherwise boost creep city. End thread

 

CREEP CITY!!!

 

Wow do NOT cut your manifold to downgrade the wastegate port. Your manifold requires a 44MM V band type wastegate. Buy one lol. If that's a problem sell that fancy header for a new one with 2 bolt 38mm external wastegate flange and keep some money

 

This is the best notion brought up so far.... A topmount may "look" cool, but for what you're doing, its best to go with something else entirely here. Just because its a deal, doesn't mean its the best idea..

 

I agree its never better to cut off a wastegate flange and go smaller. But is there any issues on going bigger? Like if you have a topmount with a 44mm and you see too much creep, could you cut it off and bore out the hole a little to go with a 60? or would that weaken the manifold design.

 

u could do that or u could just add a second gate on the other side. I'm in the same dilemma right now but mine isn't done yet so I don't know for sure if it will creep or not but if it does im just gonna add a second gate.

 

there's more to "creep" or "spike" than just wastegate SIZE. Its wastegate size in correlation with amount of boost pressure you plan to use, the boost controller and type used, and location of wastegate flanging.

your dilemma can be solved with just stating what your wastegate/manifold/ wastegate location/turbo/ boost pressure used.. etc.

 

It's all relive t to what turbocharger turbine your running and what will be done to the engine and what exhaust if any is being run but I can tell you that a 38mm will NOT keep up on low boost pressure and will still creep even at higher pressures. Depending what turbo a single 44 gate will work and on some turbos it won't. IE I was running a single 45mm gate and had to add a second gate because with 17 pound spring I would get. 22.5 pounds of boost. But that's my setup.

 

i do understand tha more goes into it then just size, i just was putting that option out there for the op(just realized I wasn't responding to the op lol).I've already made a thread n got some opinions n such, so there's not much need for that here. Also I have a good friend who is my tuner(a very good one actually) and im very confident we will find the best way to fix it if the situation does arise, which I really don't expect to have much of a problem being as how I'll be running around 30 psi. The least boost I'll b running will b 10-15 in lower gears(could b more, whatever it will hold)

 

I seem to find with the fully built motors and big turbos... the more boost we run the more trouble we have keeping it from rocketing up even more lol... But I guess it all depends on manifold turbo wastegate size ect ect

 

boost creep should diminish as you raise the boost. if it doesn't, then whatever manifolds you guys are using have horrible wastegate placement

 

interesting obviously u r right that it deff depends on manifold design etc.. I go to the shop all the time n watch them tune cars n from what I've seen most of the time its on lower boost pressures when they seem to creep. if they do creep at higher pressure I know sometimes if u have a solenoid u can mess with the values on the solenoid in higher rpms to level it out tho.