0269camaro

iTrader: (7)

I've searched all over the place and haven't really been able to find what I'm looking for in regards to the optimal location for the WG in a rear mount car. I have seen a couple of guys that placed the WG at the end of the ORY. I know most everyone puts it right by the turbo just like STS does. I'm building my own kit for the most part, so I can put it wherever I want.

Anyone care to comment on pros/cons of locating it in the ORY vs a few inches proximal to the turbo?

Zombie? Anyone?

GhoSStrider

iTrader: (12)

I've also been debating this. There is someone that I remember seeing in here who placed the wg after the y-pipe and said he got good results. I would also like to know why this location would be better vs. the other or vise versa. Hopefully some of the guys with more experience can enlighten us.

JoshuaGrooms83

iTrader: (2)

thats a good question. im also putting together my own rear mount system with a T76 being my power adder. Im also looking into Wastgates.

3800SII

Coming from my own personal experience with a custom rearmount turbo, it does not matter at all where you place the WG. The function of it is to bypass exhaust gasses and that is what it will do!

What you absolutely MUST do is reference the WG pressure signal to the intake manifold or otherwise the valve will open too early and bleed off boost before you get into your powerband. I did back to back runs on my project, and it made a major difference when I switched the signal from the turbo compressor to the brake booster.....

I am sure that others on here can comment.

TracyRR

iTrader: (8)

When i did my custom rear mount (i recently went front mount) i placed the wastegates as close to the engine as i could. The reason was to get the exhaust out of the hot side as soon as possible because it just takes up more space in the already small exhaust pipes....although i never had boost control issues while using two 38mm tials. It is much more important to size the hot/cold side pipe correctly on a rear mount. Best of luck!

JoshuaGrooms83

iTrader: (2)

So i would double tee my brake booster line (boost gage, wastegate reference) or would i do that somewhere else? is this a rear turbo setup? sorry for highjacking a bit. with referencing from the engine compartment would i run a wastegate still all the way back in the rear or a wastegate in the y-pipe then still run a LONG a$$ line to either?

TurboTerrorLS

I would place it as close to the turbine as possible.

JoshuaGrooms83

iTrader: (2)

I would venture that with a rear mount, the wastegate would be best haed near the turbo for two reasons,
the wastegate, depending on your boost levels and spring setting, is venting alot of exhast and i wouldnt want that going where it shouldnt.
ALso, i figue that the closer to the turbo, the faster the waste can be vented.

BlackChicken

Here's how mine looks.

kornboy

iTrader: (13)

When the wg is open it is quite loud for this reason I would place it in the back. Unless you like the sound of a broken air compressor hose right in your ear.

JoshuaGrooms83

iTrader: (2)

in the back by the turbo it is lol
Still, do i run the wastegate reeference to the brake booster for reference, or is right next to the compressor still ok?

BenLaz

iTrader: (6)

reference it from the intake manifold.

kornboy

iTrader: (13)

Mine is from turbo and seems fine but if it makes that much of a differance to go to intake ie. Sooner boost as 3800sii said I may have to give that a try.

JoshuaGrooms83

iTrader: (2)

Ok so the manifold/booster reference is ideal for the wastegate.
That long a$$ reference line wont hurt it nothing then? Just make sure its secured all the way up right?

kornboy

iTrader: (13)

Yes it will be about 12' or so of hose and you don't want any dangles so make sure you use racing zipties

3800SII

Dude... love the Avatar!

Yes, racing zipties or you can actually use some nylon electrical clamps that need to be bolted to the body for a little more rigid mount. My suggestion for the tubing is 1/4 or 5/16 fuel hose (max pressure of 50 psi) that runs about $1 per foot. If the line gets close to any exhaust part then make sure to wrap it in aluminzed tape or heat shield wrap.

Here is a link to what I did, it is kinda lengthy, but it will better help you understand what difference it makes. My system uses two wastegates with one controlling the boost and the other controls the quick spool on a twinscroll setup. Post# 70 details how I referenced it.

http://www.grandamgt.com/forum/showt...ht=twin+scroll

JoshuaGrooms83

iTrader: (2)

now that is cool. I like the split wastegate for twin scrolls idea. I might have to do somthing like that if i cant find an accual spool valve setup

3800SII

It works like a charm;it is cheap as ever; and it is easy to do. The main thing is having a twinscroll turbo that is larger than what would be feasibly necessary. For a 3400 v6 I chose .86 AR, and I would suggest .96 for an LS based motor, but it all depends on your cubes. Half the scroll means more backpressure going to the turbo. I have found out that it is not a great idea for the sake of gas mileage, but making full boost in fist gear is fun

Also not to hijack this thread anymore, but getting a wastegate with a stainless steel piston instead of regular steel will prevent alot of seizing. I have my WG greased heavily inside with anti-seize, but every 6000 to 8000 miles I remove it and clean the rust out of it. A synchronic wastegate would work miracles but the cost is on par with a quick spool valve...

JoshuaGrooms83

iTrader: (2)

I know its diggin but just to make it clear, i can tie the wastegate reference into the brake booster line leading into the manifold right?

JoshuaGrooms83

iTrader: (2)

have a question again on this/. right now i just gonna run it from the compressor, but whats the reasonings between the two when running a rear mount? just asking for a clear picture as to why.