First time Poster!

Need some info here.... still learning about the turbo stuff.

Right now on my 700 Rappy... I am running a gt28 at 8psi of boost, internal wastergate. I want to switch over to an external waste gate and run in the high teens PSI.... but not sure yet if I'm going to be switching to a gt20 or not.

Does anyone know what size, or around what size waste gate to get?
And which are good brands? Do they all require new springs to work with a PSI, or are some of them adjustable on the fly? (just in case someone beats me )

Here are some pics of my setup now

Tony





Also if someone wants to trade a GT28 for a gt20 Lemme know....

 

That's badass. Why not just hook up an MBC? If you really want an external gate, a 38mm Tial or Tial knock-off would be fine. Turbonetics Deltagates are adjustable but that's gay.

 

I'm sorry, new to the turbo forums What is a MBC?

 

mechanical boost controller (MBC)

 

Thank you for answering my questions

I am looking at this wastegate on ebay
http://cgi.ebay.com/ebaymotors/UNIVE...=1218490855250

Would this one hold up for 10 hours? That's about how much I ride my bike a year.

And does the flange just weld to my exhaust, and I drill a hole out? Is there any kind of dump needed for this style wastegate?

Opinions?

 

That would do you just fine but like I said, with a $15 MBC you could do at least 14-15psi no problem and wouldnt have to weld/cut anything. Literally a 30-second install.

MBC bleeds of some of your boost and "hides" it from the wastegate, making the gate open later.

If you want to install the external gate it needs to be on the manifold before the turbo, preferably in such a way where all of the runners get a semi-equal shot at expelling exhaust through the gate. You don't *have* to make a dump tube but that ---- is hot and will melt stuff.

Unless you're shooting for some god-awful power, just do the MBC. You'll want to get one for tuning your pressure anyways so go ahead and just buy one first.

 

I get what you're saying. Is there a link on here where to get a MBC? And how does it bypass the wastegate? Sorry for the questions, just kinda threw this thing together, now I'm going for fine tuning and boost.... it already hauls *** the way it is.... but you know like blowers and turbo.... psi becomes addicting when it only takes a few minutes to change

 

boost line-----------------------mbc----------------------------w/g. thats how you hook it up. tee the signal for your w/g and put the mbc where you tee'd. simple

 

its a spring pressing on a ball bearing increasing the amount of manifold pressure, by keeping lower pressure from pushing that ball bearing out of place and letting pressure go by. it just lets less by basically. sorta like using a smaller tip on a garden hose. higher pressure.

 

Where does the boost line come from? I hooked up what I thought was a vacuum line, to my Throttle Body as seen in the pictures, is that a boost line?

And does a MBC work with an internal wastegate?