who makes aboost controller with really big ports? - Page 4 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 10-07-2009, 04:56 PM   #61
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No, changing the tial wastegate isn't that ******* difficult. At worst have your man lover press down the cap with his fat hairy *** while you bolt it back on.
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Old 10-07-2009, 08:45 PM   #62
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I'm curious which port does what. Boost pressure in the top port AS YOU DREW IT will close the wastegate, increasing boost. This is backwards. I'm not sure what's wrong, but something is wrong.

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Originally Posted by gospeed81 View Post
Once again...another thread where hustler is missing the simple solution.

You have a badass WG...just change the springs. Simple, easy and effective.

I can see it being a bitch when the motor is hot....but really, when you wake up in the morning and assess how much like a man you feel, you pretty much know what kind of boost you want to run....and it's only slightly more work than fiddling with a MBC.
Yeah, everyone is saying the same thing here. Do it. You can always run EBC and just have a spring sitting around you don't need.

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Originally Posted by hustler View Post
stfu, motherfuck. turning a **** > 6 bolts, 2 springs, lots of pressure, stfu. Its a bitch.
You know, if you wanted to be clever and spend money, there are caps with a tapped hole in them. You turn a bolt, it pushes on the spring, and you get more boost. See if you can't buy one, if you can't buy one, see if you can make one. Heck, I could even give it a try.

But that's a "MBC" which won't interfere with the characteristics of the stock valve.

(did that make sense? I can draw a shitty picture if you want)
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Old 10-08-2009, 11:06 AM   #63
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Quote:
Originally Posted by AbeFM View Post
I'm curious which port does what. Boost pressure in the top port AS YOU DREW IT will close the wastegate, increasing boost. This is backwards. I'm not sure what's wrong, but something is wrong.
on the TiAL external wastegate:

TOP port provides CLOSING pressure to the diaphragm

BOTTOM port provides OPENING pressure to the diaphragm

DUMP port provides OPENING pressure to the VALVE

SPRING is on top and holds the valve CLOSED when pressures are equal or greater on TOP.
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Old 10-08-2009, 11:06 AM   #64
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Quote:
Originally Posted by hustler View Post
I've tried my ebay boost controller with larger barbs and I guess the internals don't flow enough and it overboosts. Until then, I'm back to running 11.5psi, which I should also note turns out to be extremely fast.

I need a boost controller with at a minimum 1/4" porting throughout.
I just realized the answer to this question the whole time is that you should be running a bigger wastegate, not a bigger boost controller.
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Old 10-08-2009, 01:57 PM   #65
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Quote:
Originally Posted by y8s View Post
on the TiAL external wastegate:

TOP port provides CLOSING pressure to the diaphragm

BOTTOM port provides OPENING pressure to the diaphragm

DUMP port provides OPENING pressure to the VALVE
Yay! I'm not totally insane!

Quote:
SPRING is on top and holds the valve CLOSED when pressures are equal or greater on TOP.
Er, and when the pressure on top is slightly less...



Oh yeah, what size wastegate is it? It seems counter intuitive but yes, I had more boost control issues when running higher boost. :-)

What size wastegate is it?
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Old 10-08-2009, 03:47 PM   #66
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Quote:
Originally Posted by y8s View Post
I just realized the answer to this question the whole time is that you should be running a bigger wastegate, not a bigger boost controller.
So you think a 38mm wastegate is too small with a 53.8mm wheel / .84ar turbine on a 1.8 at say 200whp? Seriously? The damn wastegate port is 2/3 the size of the turbine wheel.
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Old 10-08-2009, 04:10 PM   #67
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lets see, you say it "overboosts"... is that transient or steady state over time? in other words, with the MBC removed, turbo direct to bottom/side wg port, does it hold steady?

if it creeps up after hitting your set point, then yeah somehow you're outflowing the wastegate. the two solutions are 1) run more boost or 2) get a bigger WG.

if it spikes and settles back down to target, your plumbing (or bc) is cocked up.
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Old 10-08-2009, 04:17 PM   #68
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Just running on the gate, it works perfectly. With the boost controller hooked up to the top it overboosts at 5500rpm. With the boost controller on the side port, it spikes.
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Old 10-08-2009, 05:27 PM   #69
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Spiking will be due to EITHER too big a bleed hole in the MBC, or too low flow in the MBC - this has already been covered.

A better spring in the wastegate will work better because it'll start to open as you get closer to your target. Slower build, but less spiking. This has already been covered.

Putting it on the top port is just plain wrong. This has already been covered.

Why not try some of the suggestions people have made?
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Old 10-08-2009, 05:43 PM   #70
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Quote:
Originally Posted by AbeFM View Post
Spiking will be due to EITHER too big a bleed hole in the MBC, or too low flow in the MBC - this has already been covered.

A better spring in the wastegate will work better because it'll start to open as you get closer to your target. Slower build, but less spiking. This has already been covered.

Putting it on the top port is just plain wrong. This has already been covered.

Why not try some of the suggestions people have made?
I don't understand why I want to the a spring that will open as I get closer to the target. It opens fine at 11psi

So why do they put a top port in if its "just wrong?" The car definitely drives better with the BC on the top port, rather than just the side port.

I've tried all the different port configurations.

I'm going to attempt to make a ball and spring valve with bigger guts this weekend. I think its related to line size considering that when I switched from 1/8 to 1/4" line on the side port, only running spring pressure, it started working perfectly.
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Old 10-08-2009, 05:59 PM   #71
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1/8th is pretty small.

I think you want the MBC on the bottom port, and the compressor outlet on the top port. Actually, you know what you really want? You want a solenoid which switches air from the top port to the bottom instead of venting from atmosphere to the manifold.

Sound right, Matt?
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Old 10-08-2009, 06:01 PM   #72
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Quote:
Originally Posted by AbeFM View Post
1/8th is pretty small.

I think you want the MBC on the bottom port, and the compressor outlet on the top port. Actually, you know what you really want? You want a solenoid which switches air from the top port to the bottom instead of venting from atmosphere to the manifold.

Sound right, Matt?
no, you're wrong on the port configuration. I don't really want an EBC either because I like the way an MBC drives.
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Old 10-08-2009, 11:28 PM   #73
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I used an MBC on the bottom only and it rocks.

but... using both ports allows you to use boost to hold the valve closed against exhaust pressure.

I dunno, I intend to use the adaptronic EBC at some point, but I'm not sure how I'll wire it up.
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Old 10-09-2009, 02:26 PM   #74
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It sounds like using both ports will make the two port wastegate behave more like a single port wastegate + MBC.

What do you think about that, Matt, having a switch? So, when you want to close the wastegate, you pressurize the top port, when you want to open it, you pressurize the bottom.

My feeling is it'd be hard to control, pushing too hard on both sides, but still, use the same solenoid but route the lines different.


Right now it would be trying to close the wastegate
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Old 10-09-2009, 04:14 PM   #75
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i dunno. i'd say run 3/16 or 1/4 lines but i'm not sold on that being the issue.

I think I'd run comp sourced boost to the bottom all the time and PWM boost source to the top. use the normally closed port on top so it's going to fail safe and use boost to hold it shut in parallel with the spring.

for MBC, I just run it to the bottom.
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Old 10-09-2009, 05:58 PM   #76
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Quote:
Originally Posted by y8s View Post
i dunno. i'd say run 3/16 or 1/4 lines but i'm not sold on that being the issue.

I think I'd run comp sourced boost to the bottom all the time and PWM boost source to the top. use the normally closed port on top so it's going to fail safe and use boost to hold it shut in parallel with the spring.

for MBC, I just run it to the bottom.
well when I had a 1/8" line to the WG it didn't work right at all. When I put a 1/4" line on it, it drove like another vehicle.
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Old 10-11-2009, 03:54 AM   #77
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Interesting to know. I might look at my own. I think I have a short piece of small tube, and large everywhere else.

As to the normally closed port failing in such a way as to give you a safe mode, that would still work with what I drew, just imagine a little "normally closed" by the orange line. :-)

The nice part with what I'm saying is that closed would really be closed!
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Old 10-11-2009, 09:50 AM   #78
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Quote:
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The nice part with what I'm saying is that closed would really be closed!
I'm not concerned with this at all. Its making target so low that even when I cruise in 6th w/363 on the highway, its hits target immediately when i stomp the pedal.
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