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Old 01-16-2006, 02:45 PM   #51
Freon
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Sure, why not? Mount however and whereever you like. It shouldn't really matter, unless you mount it in the trunk with 12 feet long hoses.
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Old 01-16-2006, 03:22 PM   #52
KGreb
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Does anyone have a source for a plug to connect into the stock BCS wiring harness? I'm interested in making a plug and play adapter harness from the GM BCS (using GM pigtail) to the stock BCS plug.
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Old 03-25-2006, 01:16 AM   #53
bcblues
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I hate to ask a dumb question, but why do this mod?
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Old 03-25-2006, 10:22 AM   #54
Dave_MacKinnon
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In the case of my AEM PEMS stand-alone, I have full and complete control over the boost control solenoids operation - the result? I can make my VF30 spool faster and quicker - then hold boost better than the little stock turbo and boost control configuration.

The stock configuration is basically a bleed system - it controls how much boost pressure is bled away from the wastegate. The problem is - the wastegate is always connected to the turbo compressor. By switching to the GM solenoid (or similar), you can keep the wastegate closed completely while you are spooling up - then pop it open just in time to prevent overboosting. It's quite impressive.

The drawback - you do require something that will let you control the new solenoid - I can't tell you what those options are - just that it's well worth it in terms of how the car responds.
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Old 03-30-2006, 01:30 PM   #55
twg
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I have a sti block with the vf39, I'm about to get retuned... will the GM solenoid provide any benefit over the stock solenoid ?
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Old 04-07-2006, 11:53 PM   #56
Dave_MacKinnon
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Did some tuning this past week.. In my car (2.0, VF30, Pinks, u/p, turbo-back and pulley) we were able to make a full 18lbs of boost by well under 4000rpm in second gear, as low as 3800 as i recall - I'll check the logs and post shortly...

So, why is this better. IF you can control / tune the GM solenoid (or anything similar that allows you to disconnect the wastegate from the turbo), then by all means do it. On my car, the wastegate remains disconnected from the turbo while boost is building until 14-15lbs is made, then snaps open to prevent serious overboosting.

The bottom line... about 1 hours tuning on my AEM PEMS with no adjustments to fuel, timing or peak boost and I can now spin the tires in first gear from 4000-5500 rpm...JUST from tuning the boost controller.
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Old 04-09-2006, 01:30 AM   #57
bcblues
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So is this a mod for 05+ models, which have a different BCS system? Or is it useful for all models/years? I am still trying to wrap my brain around what the GM part does differently from the OEM one.
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Old 04-09-2006, 01:48 AM   #58
WR^2X
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If I understand it correctly, and from looking at the vacuum tube routing on the stock turbo compared to the GM setup... This allows you prevent boost pressure from reaching the wastegate actuator until a certain point. Would it even be possible to keep the wastegate shut all the time? In the stock setup, the wastegate actuator is connected directly to the turbo output via vacuum tubing. With the GM BCS, the two are connected through the solenoid, so the solenoid can keep pressure from the wastegate actuator.
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Old 04-09-2006, 11:10 AM   #59
Dave_MacKinnon
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Exactly, you can keep it closed as long as you want. This lets your turbo spool as fast as possible. The stock boost control solenoid bleeds air off the permanent connection between the compressor and wastegate. As boost builds, the wastegate creeps open and boost building slows...

I wish I new more about the 'other' engine management options, but I know my AEM PEMS will let me control any type of boost controller. I have no idea what the other systems will do.

A high quality external electronic boost controller has the same result however - so the Greddy E01, Blitz SBC-id, Apexi AVC-R, HKS EVC V, Turbo XS Dtec-BC-Pro or either world racing controller.

I had some logs to post, but started tuning my idle fuel delivery when I got home and forgot to save them... dumb! soon though...
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Old 04-09-2006, 11:39 AM   #60
bcblues
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So would this be a useful addition to my 04 STi. Fairly stock, with coated stock exhaust manifolds, Cobb uppipe (also coated), TXS turboback (full 3"), Perrin inlet pipe, K&N Typhoon intake, CoolingMist Alky/water injection, running both Cobb AP and UTEC engine management? Car daily driven with lots of AX action. I also assume that running the GM BCS would be OK for BSP class?

I read earlier in this thread that this was not needed on the 04 models, or as long as the stock restrictor is left in the vacuum line. I also assume that the UTEC ABC would not be used in conjunction with the GM BCS.
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Old 04-09-2006, 12:26 PM   #61
Dave_MacKinnon
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Proper boost control is useful for any turbocharged car. BUT, you need to be able to tune / control it. Changing to the GM BCS is not simply a matter of making a swap - it needs to be controlled and tuned. You need engine management control over its duty cycle vs engine load and rpm.

If a vacuum line has a restrictor, then it's a bleed-type setup. This system works better than that.

If the BSP class allows external electronic boost controllers then this would be allowed.
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Old 04-10-2006, 02:50 PM   #62
Freon
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Block diagrams so you can see how it works:
_

_

_

Last edited by Freon; 04-10-2006 at 03:45 PM.
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Old 04-12-2006, 12:14 PM   #63
Strng1dah
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Just installed one on Monday. Works like a charm! It has been much easier to get solid boost control with the UTEC since i installed it...
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Old 04-28-2006, 05:20 PM   #64
djerickd
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anyone with the GM solenoid and Ecutek tuning? Just wondering if it's ben done before...
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Old 04-28-2006, 05:21 PM   #65
TheMadScientist
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GM solenoid+Street tuner+20G here

TMS
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Old 05-08-2006, 10:47 PM   #66
ZR2_S10
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can someone with stage 2 or 3 post their boost map?

I just installed this today, and just put ecu in 0-20%
200 in 30 & 40%
250 in 50 & 60%
300 in 70 & 80%
350 in 90 & 100%

I only hit 15psi set up like this.

Thanks,
Jason
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Old 05-09-2006, 04:32 PM   #67
Freon
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Then increase the values! That simple. Eventually, you'll be running 100% WGDC. If you can't hit target boost with a 3 port at 100% wastegate duty, you have another problem. 3 port or blocking or interrupt solenoids allow ZERO boost to reach the wastegate at 100% DC.

If you put 450 in your map and still can't hit target, it probably means you need a stiffer spring, have a leak/crack in the turbine, boost leak, etc.

3 ports allow a full envelope of performance. 100% boost to the wastegate actuator all the way down to none.
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Old 05-18-2006, 11:15 AM   #68
Adrift
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Rock Auto has this solenoid for 12.69. AC Delco part number 214-474.
The also have the pigtails for 15.64. AC Delco part number PT 374.
http://www.rockauto.com

34.81 shipped for both.
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Old 05-18-2006, 11:26 AM   #69
WR^2X
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Quote:
Originally Posted by Adrift
Rock Auto has this solenoid for 12.69. AC Delco part number 214-474.
The also have the pigtails for 15.64. AC Delco part number PT 374.
http://www.rockauto.com

34.81 shipped for both.
Yep. This is where I bought them. Even cheaper if you use their discount code!
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Old 05-31-2006, 12:54 PM   #70
silver arrow
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When I move to BSP or SM this will be my first mod.
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Old 06-01-2006, 10:56 AM   #71
Irishman
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What is the difference between the GM solenoid and the AC delco solenoid? Is one better then the other? What size is the vacuum line that I need to get?
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Old 06-01-2006, 10:59 AM   #72
Freon
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Notice in the pics on the first page, the packages say "AC Delco" on them. It is a GM part number, but AC Delco manufactures it. They produce a lot of GM electrical parts. Just like the stock Subaru EBC is produced by Denso.
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Old 06-07-2006, 11:25 AM   #73
jblaine
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Thanks for the block diagrams, Frank.

Worth 1000 words.

EDIT: Err... Freon, not Frank
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Old 06-07-2006, 11:40 AM   #74
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Quote:
Originally Posted by Adrift
Rock Auto has this solenoid for 12.69. AC Delco part number 214-474.
The also have the pigtails for 15.64. AC Delco part number PT 374.
http://www.rockauto.com

34.81 shipped for both.
PT 374 now returns "Coolant Level Sensor Connector" and looks nothing like a pigtail
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Old 06-07-2006, 11:51 AM   #75
Freon
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The pigtail is used for all sorts of stuff. The part number I posted in post #1 (GM Part # 12102747) is correct, but comes up as a wiring harness for something else as well.
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