turbocivic6776

ok take the line from your throttle body that goes to your wastegate and cut it then install the mbc in between and dial in the boost you want im guessing you have a guge to read from because thats the only way that u know what boost you will be running with a mbc.

txdohczc

+1
thats exactly what i meant

Pdub383426

I think this blueish hose is the line that I ran. I did install a gate valve inbetween the the wastegate and throttlebody. I tried blocking it off all the way, and didn't feel a difference, but then again I haven't had it on the dyno that way, but possibly soon. I did notice one time I had it blocked off, that it spat the line off....obviously because of boost right? Should I make a MBC to go there instead of this gate valve? And with a MBC, can I run higher boost even though my wastegate is set a 8psi? I did just install a boost guage, but haven't tried that test with it on yet.... maybe it's bout time I do that.

Anyone have pics of their MBC?

Sorry for the Noob questions.... still learning

MerkurColin

Let me preface my question by saying that I don't intend to come across as a dick - we were all noobs at one point. :1

How the hell did you manage to install a turbo on this thing with such minimal knowledge of turbo setups? Did somebody else build it?

Anyway, nice setup. Get a manual boost controller. http://www.boostvalve.com

Colin

Pdub383426

Thanks, that would help alot.

Yea, a friend built it, now I'm attempting to duplicate it for another bike. ----, I know the in's and outs of a Roots style blower, cams (which from what I understand are similar to turbo motors) heat, afr's, etc.... just trying to nail down the refined terms for the turbos. I'm sure I'll pick it up in no time

I just have always done Naturally aspirated, or blown V8's.... I see alot of nip cars running around here, and I know you guys are the go to guys for the turbo stuff. Also I'm in the middle of building a twin turbo 340 Dodge, I'm welding up the headers tonight

Pdub383426

Thinking about this again, on my boost line I ran a gate valve, closing it would make it make more boost too correct?

idiot-stick

Im going to agree 100% with Colin on this. You are a ------- idiot..just kidding but seriously you really NEED to understand what's going on down there with your wastegate and how it works and what it does and why. If you hook it up wrong and go WOT, your ---- can and will explodify all over the place and get oil on your legs.

You seem like a nice enough noob, so I'll help you out.

The turbo needs exhaust to spin, right? The more exhaust, the more spin = the more boost...

The wastegate is a flapper door that opens in the hotside of the turbo that will let some of that exhaust bypass the turbo, so it doesnt spin so fast thus limiting boost.

The flapper door is actuated by your wastegate actuator that turns boost into the mechanical movement of the actuator rod which in turn opens the flapper door, limiting your boost.

Say you get to 8psi. The wastegate sees that boost and opens the flapper door just enough to limit you to 8psi. Let off the gas to partial throttle, say you're making 6psi at that point - that is not enough pressure to open the flapper, so all of the exhaust gas is now working again to get you to full boost..hope that made sense.

So anytime the boost hits 8psi, you'll have enough pressure to turn that into mechanical movement to open the flapper door.

Say you poke a tiny hole in your wastegate vacuum line so now when you are making 10psi, lets say about 2psi excapes out of that hole. The wastegate is seeing 8psi even though you are actually making 10psi. The wastegate doesnt give a ---- about the price of tea in China. All it knows is that when it sees 8psi, it opens the flapper - limiting your boost.

The MBC is equivalent to that hole in your wastegate line.

The thing next to your wastegate can is called a Blow Off Valve. That's another thread.

It would be best to give the wastegate it's own vacuum line for safety and make sure that ---- ain't gonna pop off. Use zip-ties, hoseclamps..whatever. The wastegate line only needs to see boost, not vacuum & boost. But if it sees vacuum, no harm done. You can get this line from either after the throttle body or before it.

The blowoff valve needs to get both vacuum (for it's actuation) and boost (to keep it closed during boost). Therefore, you want to get your signal AFTER the throttle body.

If you dont understand any of what I just said - understand it before you do anything.

MerkurColin

Read this:

http://auto.howstuffworks.com/turbo.htm

http://www.boostcruising.com/forums/...d=&st=0&#entry

(Read the first post only. The people commenting on it are tards.)


Buy this:

http://www.amazon.com/Maximum-Boost-...8551890&sr=8-1

Pdub383426

Thanks SloS13, that was drawn out enough for it to be clear to me

That turbo line was unrestricted before, straight to my throttle body, so wouldn't that mean that it should be letting additional boost by anyhow? I understand how an internal/external wastegate works, and the BOV... just trying to get to the nitty gritty now....

After I had hooked up my guage finally, I noticed my bike is pullnig vacuum until about 4000rpm, then it starts boosting. I'm pretty sure this is possibly because the turbo is too big correct?