Subaru Enthusiasts Car Club of the Sierras

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- Technical Chat (https://www.seccs.org/forums/forumdisplay.php?f=11)

- - if i get (https://www.seccs.org/forums/showthread.php?t=6210)

a manual boost controller and only want to boost a few more pounds out of my sti will it cause problems

ive heard good and bad things

I think I've heard enough bad that I wouldn't go for one. . .

. . .you know, if it mattered to my car.

ibscottgoesnuts

Quote:

Originally Posted by M3n2c3 (Post 105446)

I think I've heard enough bad that I wouldn't go for one. . .

. . .you know, if it mattered to my car.

ibscottgoesnuts

BOOM!

A MBC on an otherwise stock car is a terrible idea. You *will* damage the motor, because you *will* run lean.

Quote:

Originally Posted by sperry (Post 105448)

BOOM!

A MBC on an otherwise stock car is a terrible idea. You *will* damage the motor, because you *will* run lean.

If you get custom tuned though, apparently they are the way to go. Ask Cody and Scott, they both have them. :lol:

Do it right. Run the boost you're tuned for.

Quote:

Originally Posted by Dean (Post 105454)

If you get custom tuned though, apparently they are the way to go. Ask Cody and Scott, they both have them. :lol:

Scott got an MBC?

:omg:

Quote:

Originally Posted by sperry

If MBC's were so great, I'm pretty sure Subaru would have put one on the car to begin with 'cause they're about 1/50th the cost of the EBC.

Quote:

Originally Posted by sperry (Post 75839)

Call me a stick in the mud, but switching to a MBC is a step backwards IMO. Reeks of the MBC/UniChip days.

Quote:

Originally Posted by sperry (Post 75880)

In my experience, the factory setup is far superior to a manual solution, even with the "limitations" inherent to the design.

Oh yeah Cody, you weren't supposed to find out.

Quote:

Originally Posted by nKoan (Post 105457)

Oh yeah Cody, you weren't supposed to find out.

All I can say is...

BAHAHAHAHAHAHAHAHAHA :p

Next you'll all be running Crucial parts and going to Ed to get tuned. :P

Quote:

Originally Posted by cody (Post 105458)

All I can say is...

BAHAHAHAHAHAHAHAHAHA :p

Next you'll all be running Crucial parts and going to Ed to get tuned. :P

Wasn't this joke made like 6 months ago? I thought I even made it myself shortly after it was on the car.

And frankly, I still don't like the MBC, but MikeW put it on the car. Something about not having enough time to properly tune for 22+ lbs of boost in the Hydra in time to get the car to the track in time for the season. The stock EBC wasn't cutting it, at least not without hours of tuning, so it was to the simpler MBC solution.

So, the situation's quite a bit different than a MBC on an untuned car, or even on a car with a reflash. And even still, with the MBC I was seeing 2 lbs of overboost (though on a MAP based car, that's not quite the big deal it is on a MAF based tune). Also, my motor did in fact blow up with the MBC on it, though I don't blame the spun rod on the MBC.

I'm actually planning on going with the GM solenoid when the motor gets retuned.

Aw, I was only joshin'. The GM solenoid is a great way to go. FWIW, I'm still running the Hallman and lovin' it.

Quote:

Originally Posted by cody (Post 105463)

Aw, I was only joshin'. The GM solenoid is a great way to go. FWIW, I'm still running the Hallman and lovin' it.

That's what's on my car, and I'm less than impressed. Under long pulls, the car hit and stays at the target 22psi of boost, but my tell-tale on the gauge shows 24 psi peak. Which must occur mid corner at partial throttle or some other transitional period when I'm too busy driving to watch the gauge.

I'd still rather have a computer regulating the boost than a spring, but a spring is way easier to "tune".

It can fluxtuate a touch, but my logs usually show a nice smooth boost curve.

Quote:

Originally Posted by cody (Post 75833)

Code:



RPM        Manifold Relative Pressure (PSI)

1968        -8.996

1926        -8.996

1926        -8.996

1926        -8.996

1921        -9.141

2051        -0.435

1980        0.145

1968        0.435

1983        0.725

2004        0.871

2005        1.161

2036        1.451

2055        1.741

2100        2.031

2108        2.176

2142        2.467

2154        2.757

2187        2.902

2208        3.192

2242        3.482

2247        3.627

2285        3.918

2315        4.208

2330        4.353

2356        4.643

2401        4.933

2448        5.224

2455        5.659

2502        6.094

2498        6.384

2550        6.82

2580        7.255

2625        7.835

2679        8.416

2693        8.706

2730        9.576

2781        10.447

2827        11.463

2849        12.624

2906        13.929

2948        14.8

2961        15.816

3050        16.396

3104        16.541

3146        16.541

3193        16.541

3278        16.396

3308        16.396

3351        16.396

3439        16.541

3461        16.396

3558        16.396

3588        16.396

3639        16.396

3702        16.251

3769        16.251

3811        16.251

3874        16.251

3922        16.251

3935        16.251

4011        16.251

4067        16.251

4112        16.251

4173        16.106

4230        16.106

4256        16.106

4308        16.106

4406        16.251

4456        16.106

4454        16.396

4548        16.541

4568        16.686

4638        16.686

4696        16.541

4714        16.541

4777        16.396

4867        16.251

4902        16.251

4908        16.106

4960        15.961

5020        15.816

5081        15.671

5137        15.525

5133        15.38

5205        15.235

5271        15.09

5330        14.8

5372        14.8

5380        14.655

5478        14.51

5515        14.51

5519        14.365

5601        14.22

5580        13.929

5660        13.929

5695        13.784

5725        13.784

5800        13.639

5850        13.494

5905        13.204

5905        13.204

5943        13.059

6010        12.914

6053        12.769

6083        12.624

6068        12.769

6107        12.624

6142        12.478

6178        12.333

6260        12.333

6313        12.188

6340        12.188

6324        12.043

6367        12.043

6454        12.043

6432        12.188

6527        12.043

6510        12.043

6510        12.043

6602        11.898

6637        11.898

6667        11.898

6655        11.898

6745        11.898

6745        11.898

6726        12.043

6818        11.898

EQ tuning recommended the Hallman to tune Imprezif's car. I know absolutely nothing about tuning or an MBC so I just took his experienced word for it.

Quote:

Originally Posted by gg newb (Post 105486)

k thanks you guys

Oh, don't worry, we will keep going even if you, the original poster, got the information you wanted 10 posts ago.

It's how we roll. :)

Quote:

Originally Posted by sperry (Post 105465)

Which must occur mid corner at partial throttle or some other transitional period when I'm too busy driving to watch the gauge.

Could you get your in-car cam pointed at it?

Quote:

Originally Posted by M3n2c3 (Post 105491)

Could you get your in-car cam pointed at it?

The camera already points at the gauge, but 'cause it's a BF Defi, you can't see it on camera.

I keep thinking to swap out the BF dials for something easier to see, but it would just be expensive unless I can find someone w/ the non-BF gauges that just wants to trade with me.

Since I've got a RackPak telemetry setup, it would be sweet to get the gauges for it that get datalogged along with the GPS data... but if you think the Defi's are expensive, the RacePak setup is astronomical! It'd be like $2000 to replace the gauges I've already got.