external wastegate questions

R

RichielightweightGT

Member +
hi all im looking for some info on what diameter wastegate i need and where to get a manifold for the setup, i have a very good ct9b that im going to get migd closed, the external wastegate will solve any boost creep issues from decat and exhaust mods? is there a thread on here about preping for this or a guide as always any info appreciated as i only know a small bit about external wastegates lol :homer:
 
R

RichielightweightGT

Member +
i was looking to do something like this

tialmanifold021.jpg
[/IMG]

would this b a waste of time on a standard ct9 mani or doing it to a stainless mani because i know two people who work in welding and engineering i could get it done handy off them, is a 38mm waste gate the best and why?
 
spuddy

spuddy

Ulster Area Rep.
That looks like its only on 1 runner, the pipe for the wastegate needs to be connected to all 4. You'd be safer buying one already made up, not sure you can weld stainles or mild steel to cast Iron.
 
R

RichielightweightGT

Member +
ya i was reading on another forum and you have to preheat the cast iron and mig weld it, as for the wastegate itself they said shud b ok on one runner but im not 100% thats why im asking lol but i was going to get a stainless mani and get a wastegate welded on in a similar way i want to run .8 on ct9 with no creep issues and keep room for more mods :)
 
R

RichielightweightGT

Member +
does any1 have any pics of a welded wastegate and what so you do to the original discs likage does it just pop off or do u have t cut it out and weld up the gap it leaves? and did ye split the turbo to avoid spatter onto the turbo fins?
 
spuddy

spuddy

Ulster Area Rep.
spuddy said:
That looks like its only on 1 runner, the pipe for the wastegate needs to be connected to all 4. You'd be safer buying one already made up, not sure you can weld stainles or mild steel to cast Iron.
Click to expand...

Hmmm I got negative reped for my above comment. Don't see why though.

Dan, please explain the correct method to me and how an external wastegate that only diverts exhaust gases from one runner is the correct way to do it, since your rep comment just said 'wrong' I'd like to understand why.

cheers dude.
 
R

RichielightweightGT

Member +
orite ha ha well i would belive that the back pressure from the turbo in the mani would press on the wastegate open when you go past your set pressure ie .8 of a bar but i just want to get more info because i am not 100% on what will or wont work and any info is helpful and i get why u said it would be better off all the runners would likely be more balanced way of doing things
 
R

RobinL

Fresh Recruit
Sorry to use your thread, but what's the best way to close or block the internal wastegate?

Can you weld the cast iron, or is there a better way to block the hole? :)
 
R

RichielightweightGT

Member +
you can mig weld cast iron but you have to pre heat it first which i would think would be the best only other thing i cud thing of is make up a bracket to keep the internal gate shut like instead of the actuator
 
Stu-

Stu-

Member +
Another option is weld a stopper to the inside of the drop pipe which holds the port closed - I've had to do this for guys who don't want to weld up their housings.
 
Stu-

Stu-

Member +
RichielightweightGT said:
i was looking to do something like this

tialmanifold021.jpg
Click to expand...

That looks like a stock EVO manifold. The reason they weld them in there is for positioning of the external vent pipe (the radiator is pretty close) and the turbo bolts through the top of the manifold and access is needed to the bolts.

Unless your really pedantic or after the best possible setup (no disrespect to ct9's but they're not exactly a performance turbo) then you can weld the external pipe on just about anywhere but ideally you do want the outlet to be right in the convergance of the ports.

It's a bit hard to tell from this photo but here's the current one I made for my car (EP71 4agte) and the external comes right off the back of the collector so draws from each of the 4 runners equally.

141%20-%20Manifold%20Painted.jpg
 
R

RichielightweightGT

Member +
thats a very nice mani lol thanks for the info do you have any pictures of the fabrication process? how do you put the hole in the mainfold for the flange drill it or what?
 
You must log in or register to reply here.
Top