RB20det modified exhaust manifold!!

[tight240]

I know i remember on here i seen a picture of somebody that modified there exhaust manifold to take a external wastegate. I tried searching and could not find the page. So if anybody have that picture can you please repost it.

[TunaFish]

I modified mine to fit a t4 flange and a 40mm wastegate on my rb25. i will get some pics for you

[tight240]

Aight koo thanks.

[driftjunke]

We modify ours, done 7 of them now, no problems with welding to the cast. I will try and get some pics, the wg goes on the rear bank of the mnaifold, easy access too.

Eric

[cvc9216]

how do you weld it? mig or tig? what filler?

[tight240]

If you can get tho's pic's that would be great. I found one style that would work, but i still will like to see how you guys modified yours.

to thoes that are interested, here's one way too modify your stock exhaust manifold to except a bigger turbo externaly gated

zerothread?id=119451

[TunaFish]

my camera is being gay, but i just took a piece of stainless steel and welded a t4 flange on it as well as the wastegate flange. the extension/adamper is only about 2 inches long and i dont have any clearance issues

[goofynick6]

I have this pic saved on my pc...

[tight240]

How is yours setup Nick?

[fly240]

this is a very nice set up.....I'm looking for something like this. goofy...is this your set up or you got this pic from somebody....I want this set up now that i'm gonna go bigger turbo....

[s13burger]

I modified my exhaust manifold on my motor. I've posted a few pics of it. The top of the manifold was machined out, and we tig welded the wastegate flange on it.



Here it is in the car.




Modified by s13burger at 3:16 PM 9/16/2005

[MidWest240Collector]

How hard is it to do this, can a machine shop do this?

[cvc9216]

what filler did you use to weld the flange?

I modified my exhaust manifold on my motor. I've posted a few pics of it. The top of the manifold was machined out, and we tig welded the wastegate flange on it.Modified by s13burger at 3:16 PM 9/16/2005

[Andrew85cm]

What does the wastegate flange need to be made out of to be welded to cast...would it be just mild steel? Sorry that might be a dumb question.~ANDREW~

[Tictakman]

just wanted to bring this back up bc i had a few questions.

im going to modify my stock manifold and use a t4 flange hoping to run a gt30 or a little larger turbo and external gate....

is there any particular placement that the wastegate should be? in between certain runners? should i weld it right to the cast manifold or should i use a 45 degree elbow or something?

next question is: should i use a 40mm wastegate or a 38mm wastegate? any special reason for one or the other? id prefer to run a 38 just because of the size....

last question: i have a mig welder that ill be using, will that work alright?

thanks guys

Zak

[Tictakman]

this is on a rb25det by the way, im shooting for 500rwhp w that gt series turbo.

Zak

[DriftingisLame]

I've heard cast will weld just fine if you use nickel.