Whats The most accurate way to set boost?

[grdsm]

What is the most accurate way to set a manual boost controller? I have a aftermarket boost gauge, bigger turbo, egr block off, external wastegate aftermarket bov..... I would like to know what is the most accurate way to set my mbc. I seems that my wastegate opens roughly around 15 and 18 psi. and it boost up fatser at time then others.

 

[dsmfa9nutter]

It's easy for people like me. The only vacuum lines on my car are the ones I need(fpr, boos gauge, wastegate, bov). All of them are routed to the intake manifold via factory fittings. You can also hook it up to the P port on the throttle body or T into the fuel pressure solenoid.

Ditto. I didn't want to run lines all the way back to the intake though, other than the brake booster of course.

 

[1992awdlaser]

well.. on like a tial wastegate for example, always supposed to get the boost source FROM THE COMPRESSOR HOUSING, or else its hard on the diaphram. This is a fact. Call Tial and ask them, they will explain it to you. I have done it from the manifold in the past, but i don't anymore. I get 0 creep, 0 spike, no nothing. Everything works the way it should.

I would like to hear why somebody would think this. If anything, the compressor cover would be harder on the diaphram since the air going to it would be super hot. At the intake manifold, the air would not even reach 200* on most cars, in fact a good fmic will keep it in the low 100's. At the compressor cover it could be higher than 400* easily.

 

[anteversion]

I would like to hear why somebody would think this. If anything, the compressor cover would be harder on the diaphram since the air going to it would be super hot. At the intake manifold, the air would not even reach 200* on most cars, in fact a good fmic will keep it in the low 100's. At the compressor cover it could be higher than 400* easily.

I totally agree with you. This is the true and the only answer that sould be known from anybody cause those are the pure and simple facts of how the air react in a turbocharged/intercooled system. Best way to route all your vaccum/boost sources is from the intake manifold to prevent variation from ambiant air temp.

 

[MrBoxx]

As long as you're not tapping the BOV line for your MBC pressure signal, I don't care anymore where you get the signal from. But don't fvck with your BOV's operation by inducing a boost leak in that line.

If you're still not sure which spot to take the source from, try it both ways. If one works better than the other, you've found your spot. If not, flip a coin.

 

[92AWDHX40]

So where is the best place to use a source for the mbc?

 

[MrBoxx]

So where is the best place to use a source for the mbc?

Read my above post, then read every post above IT.

I say take it from the compressor housing/intercooler pipe and call it good. You might get a 1-2 psi fluctuation in summer vs. winter, but you know what you do then? Turn the boost down 1-2 psi or turn it up 1-2 psi.

 

[92AWDHX40]

Thanks.

 

[1992awdlaser]

I say intake manifold as you have read. The only reason I say this is to have the same amount of boot in each gear and during multiple pulls. If you have it before the intercooler, the boost will vary, maybe not in gears depending on setup, but it will with multiple pulls.

 

[grdsm]

Okay some say to t off the bov and some say not too what way is the way to go. I am t ing off the bov currently.

 

[toofast82]

It is recommended to not tee off the bov. The discussion has become whether the vacuum source for the boost controller should come from the compressor outlet/ic pipe or from intake manifold vacuum source. I am not about to get in the middle of this one because I really dont think in the real world either will make a huge difference

 

[1992awdlaser]

DON'T T off the bov.

 

[Grescht]

ok, before you slap fuel cut at 18psi...... DONT BOOST THAT MUCH!! you don't have fuel mods therefore with a bigger turbo i wouldn't get near 15psi. and with all the arguments i would run the MBC where there is a lesser chance of boost spike. Once you get fuel mods, it really doesn't matter. run whatever and wherever and tune accordingly.

 

[grdsm]

again how should line be ran if not t-ed off the bov????????

 

[GsXdSmKingGsX]

why would you t-off the bov?

 

[1992awdlaser]

again how should line be ran if not t-ed off the bov????????

Did you read every post? Re-read post 24, your answer is there.

 

[grdsm]

diagram please...

 

[tsi1991awd]

So say you hook your boost gauge to your FPS....do you also tee off of the FPS line and connect it to your MBC, and then the outlet to the wastegate? Is that what everyone is talking about?

 

[MrBoxx]

Search terms: "mbc + install"

http://www.dsmtuners.com/forums/articles-turbo-system-intercooler/237982-best-way-install-mbc.html

This is totally not rocket science.

 

[viprez586]

Wow spoon feeding here?
Honestly if you are that unsure...well are you sure your capable of increasing the boost knowing the effects of doing so and how to compensate for your adjustments? Or do you just want to hear the BOV?
<img src="http://www.dsmtuners.com/gallery/files/7/2/2/1/8/simple.bmp" alt="Mbc For Idiots" />

Your SIMPLE and easily search worthy question gets a nice simple crap MS paint picture.

I'm not even going to bother with the intake manifold routed version. This is the correct way to hook up your BOV and MBC.
If this isn't clear enough consult a speed shop.

 

[MrBoxx]

If this isn't clear enough consult a speed shop.

Better yet, grndsm, you can swing over to Midland MI, and I'll fix your car up for you. Free of charge!

 

[slowgsr]

ok, I can't stand when people use their own theory on how something works and decide how to install it and take the facts for fiction.

You hook wastegates up to boost only sources ie. The compressor housing, you don't want the diaphram to see vacuum. The high temperature reason why not to hook them to the compressor housing is absurd, you have exhaust gas moving through these things, they get hotter than any of your incoming air anywhere !

So why we don't provide a wastegate with a vacuum line going to the intake? Because you don't want the diaphram too see vacuum since it can pull on it and damage it. This info is straight from tial which I personally recieved. Ask them for yourself

Hook it up however you want, but the compressor housing is the proper source PERIOD

 

[1992awdlaser]

ok, I can't stand when people use their own theory on how something works and decide how to install it and take the facts for fiction.

You hook wastegates up to boost only sources ie. The compressor housing, you don't want the diaphram to see vacuum. The high temperature reason why not to hook them to the compressor housing is absurd, you have exhaust gas moving through these things, they get hotter than any of your incoming air anywhere !

So why we don't provide a wastegate with a vacuum line going to the intake? Because you don't want the diaphram too see vacuum since it can pull on it and damage it. This info is straight from tial which I personally recieved. Ask them for yourself

Hook it up however you want, but the compressor housing is the proper source PERIOD

Did I say you were providing misinformation? I didn't think so. I said I would like to know their reason. I didn't say he air at the compressor cover would cause a problem, I was simply saying the only major difference between the two spots. Guess what, you will see vacuum at the compressor cover also. When the intake is under vacuum, the entire intake system is under vacuum.

What I have been saying in this thread about using the intake manifold is from real world experience, it's not a theory. The easiest way to explain it: go take a 16G powered car that is running high boost(mid-high 20's). I guarantee with the boost source at the compressor cover the boost will vary during a second pull and most likely during the first pull in the upper gears. The fix? Put the boost source on the intake manifold so the air going to the boost controller doesn't get super heated like it will at the compressor cover of the 16G. This has been proven by multiple people.

 

[92AWDHX40]

I dont have a nipple on my j pipe, so i should use a source off the intake? Im using the gm maft set up if that helps. Thanks

 

[1992awdlaser]

I dont have a nipple on my j pipe, so i should use a source off the intake? Im using the gm maft set up if that helps. Thanks

It has been said enough times in this thread what people think the best place is to use.

 

[andy4g63]

Just wanted to say, that is impossible for the WG diaphragm to see VACUUM, if hooked up to MBC. Most MBC/good ones/, consist of ball and spring. Regardless where the signal is coming from/Compressor housing, or IM/, air pushes on the ball, which is followed by the spring. When the spring moves enough, gives the air the possibility to escape thru the OUT fitting on the MBC and enter the WG--- hitting on the diaphragm, which sits underneath the spring/s of WG.

The other way around is not possible, because as soon as you lift your foot off the gas/not even fully/, but bellow spring rate of WG and MBC, the ball sits/seals on the inside of IN fitting of MBC and therefore acts like one way valve.