Modifying an Audi Wastegate. PICS FIXED!!! 17 pics
 

Well many people are wanting to run these but at 14.5psi and non-adjustable it is not very feasble on a Honda. Well I redid this writeup so the pics are up to date. I'm not sure if it was the same method as Shorty's but this is what I came up with. I do not know the range of PSI it is now but from the lowest setting the is next to no pre-load on the spring and you can open the wastegate with your pinky finger. It can probably be adjusted to have a higher then 14.5PSI rating as the bolt you replace is longer then the Stock one.

First Pull the top of the wastegate off. there is 6 8mm nuts. Once apart it should look like this.
http://us.a1.yahoofs.com/users/41e13...Y_ENEBElAPbXR2

Secure the Hat in a Vice for ease and Grab an Allen Wrench
http://us.a1.yahoofs.com/users/41e13...Y_ENEBSxZX7GS2

Next using an Allen Wrench remove the Little Spring Seat be turning the bolt. Mine was tight and had to use some leverage, but it should come.
http://us.a1.yahoofs.com/users/41e13...Y_ENEBqK1M4TH.

Next go back to the hat and using a drill bit just smaller then the thread, drill through the hat. Be careful not to hit the threads, you need those!
http://us.a1.yahoofs.com/users/41e13...Y_ENEBLJ5X7UFM

Turn the hat over and using a larger bit drill out the little brown peice of metal you see here. If you use a large enough bit eventually the metal will break free and come out. Mine Did.
http://us.a1.yahoofs.com/users/41e13...Y_ENEBNF4He6Iw

Now return to the spring seat, Cut off the extra boss on the bottom to shorten it. I use an 4.5" grinder. I tried my band saw, but it is Harden metal, so if all you have is a hack saw, you'l be there for a while.
http://us.a1.yahoofs.com/users/41e13...Y_ENEBcqzM9t_P

Return to the hat and using a Large Drill bit, Drill off the Thread Boss to make it shorter, By the time I stopped, I have about 5-6 Threads left.
http://us.a1.yahoofs.com/users/41e13...Y_ENEBLXEeAVbO
http://us.a1.yahoofs.com/users/41e13...Y_ENEB9Ocr1p7a

I did't have a large enough drill bit so I used a die grinder to flaten the boss and clean it up a little.
http://us.a1.yahoofs.com/users/41e13...Y_ENEBNKcLI9VS

Next Get a longer bolt. Try to find the longer one that you can that still has full depth of threads. You also need a Nut and Washer. Bolt size is a M12x1.25
http://us.a1.yahoofs.com/users/41e13...Y_ENEB8va_OfL4

Side the bolt through the spring seat and place the washer on like so.
http://us.a1.yahoofs.com/users/41e13...Y_ENEByMf_Pm7U

I tack welder the washer to the bolt. This way the sping seat can still float and spin during adjustments.
http://us.a1.yahoofs.com/users/41e13...Y_ENEBXLvO87WU

Thread the spring seat through the bottom of the hat.
http://us.a1.yahoofs.com/users/41e13...Y_ENEB8cUUhit.

Thread the nut that is going to serve as your lock nut from the top.
http://us.a1.yahoofs.com/users/41e13...Y_ENEBVqYVu9G9

Reassemble the hat to the wastegat and reinstall the 6 8mm nuts.
http://us.a1.yahoofs.com/users/41e13...Y_ENEBdMO53zYf

Next using a cut-off wheel I put a small notch in the bolt.
http://us.a1.yahoofs.com/users/41e13...Y_ENEBN4i4pbLY

The notch is for using a flat head to adjust the spring preload, and thus boost.
http://us.a1.yahoofs.com/users/41e13...Y_ENEBRGiST_Mn

There you have it. Again I have not tested this theory,and wont be till next seaon probably, but I see no reason why this would not work, It acts the same way as most name brand waste gates.
Good luck and I hope this helps some people out.

Re: Modifying an Audi Wastegate. New Write Up, 17 pics
 

Just mounted a audi gate onto my HF manifold and have it dumping externally.
It seems to only want to go upto 4psi stock (strange when i expected 14.5psi or so :p ). I ran it off the side port with that huge banjo bolt.
With boost controller inline it goes higher without issue.

Runs like this..... compressor housing..... purge cut solenoid..... audi WG
-------......stock WG.

Re: Modifying an Audi Wastegate. New Write Up, 17 pics
 

Ya, You must have something off. They are 14.psi from factory.

UPDATE ON PSI RANGE:
I don't know the max, but again I know I can take it higher then the 14.5psi be preloading the spring.
As for the Min, Using a Digital Pressure, air press regualtor and a compressor, I was able to pull the Compressor down to a lowest setting of 4.0psi and the wastegate would open fully no problem. I probably could go lower yet, But Why?

Re: Modifying an Audi Wastegate. New Write Up, 17 pics
 

Why would anyone ever want to run less than 14psi boost?

Re: Modifying an Audi Wastegate. New Write Up, 17 pics
 

That's badass....

No having to mess with boost controllers or wastegate springs, just turn a screw and done.

Think I could mod my Tial? Hmmm... I bet it could be done.

Re: Modifying an Audi Wastegate. New Write Up, 17 pics
 

Thats what i was thinking ;) But mine ran 4psi :p

Re: Modifying an Audi Wastegate. New Write Up, 17 pics
 

nice diy :)

Re: Modifying an Audi Wastegate. New Write Up, 17 pics
 

nice job ;)

Re: Modifying an Audi Wastegate. New Write Up, 17 pics
 

sweet writeup man

Re: Modifying an Audi Wastegate. New Write Up, 17 pics
 

Hehe, just to confirm it wasn't my vac line layout, i ran the compressor housing right to the banjo fitting on the WG. Still 4psi :p Maybe mine was modified... anyways, boost controller on it and its all happy.