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Join Date: May 2004
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Good post here. On the Mitsubishi race car l owned the WG was plumbed before AND after the TB and the lines were connected with a "T" . Problem solved.
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Old 03-19-2008, 09:41 AM
  Pelican Parts Technical Article Directory    Reply With Quote #21 (permalink)
Crotchety Old Bastard
 
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Have you guys seen the track video of the 930 with the dual boost gage?

Someone needs to post that video here, it would clear up many of the questions asked. The gage in that car had 2 needles - measuring boost before and after the throttle body. You can see one needle chasing the other.
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Old 03-19-2008, 09:59 AM
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Quote:
Originally Posted by beepbeep View Post
BOV won't do anything to prevent vacuum in plenum chamber after the throttle. BOV is installed before throttle.
Totally agreed... what I meant was BOV will relief back pressure to the turbo when the throttle plate is closed, hence the word vacuum. The BOV itself is indeed before the throttle.
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Old 03-19-2008, 10:13 AM
  Pelican Parts Technical Article Directory    Reply With Quote #23 (permalink)
Macht Schnell
 
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Hello,
Here's what I got from TIAL Tech support.

Hello,
You run the risk of sucking in the diaphragm and damaging it on the banjo
bolt because of the vacuum.

Regards,
Jake
TiAL


Sounds like you could blow an engine to me.
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---Les Garten---85 930, Andial IC, GHL Headers, Fabspeed Dual, K-27 HF2, 3.4 JE Full Finned 7.5:1 CR, 964 CAM'd, Carerra 3.2 Manifold Cut/Flipped, Tec3r, Siemans 55#, GSF Fuel Rails, Clewett Crank Trigger, Clewett Cam Trigger,Dual Plugged, ARP Head Studs/Rod Bolts, Clewett Wires.Tial 46mm WG, Tial 50mm BOV, WEVO Shifter,934 Boost Gauge, Wideband EGO Sensor/Gauge, C2T Head Gaskets, '88 MB 300TE,BMW R100RT
Old 03-19-2008, 11:26 AM
  Pelican Parts Technical Article Directory    Reply With Quote #24 (permalink)
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Some of you are suggesting that the BOV will help if the WG line is put after the TB. I don't see it helping here. The BOV only allows the air from the turbo to be recirculated, not dumped. As no air is escaping the pressure will still be the same, it's just that the turbo impeller will not be stalled, that's all.
If the WG does not open then the exhaust gases will make the turbo continue to increase or hold it's speed andb oost will be created that is not used
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Old 03-19-2008, 03:31 PM
  Pelican Parts Technical Article Directory    Reply With Quote #25 (permalink)
Macht Schnell
 
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Hello,
The other consideration is that if vacuum is indeed a problem with the diaphragm, then the worst place to be plumbed, would be into the manifold with the throttle closing at 6-7,000 RPM in third gear.

Seems like the point is settled by what Porsche does and TIAL says to do.
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---Les Garten---85 930, Andial IC, GHL Headers, Fabspeed Dual, K-27 HF2, 3.4 JE Full Finned 7.5:1 CR, 964 CAM'd, Carerra 3.2 Manifold Cut/Flipped, Tec3r, Siemans 55#, GSF Fuel Rails, Clewett Crank Trigger, Clewett Cam Trigger,Dual Plugged, ARP Head Studs/Rod Bolts, Clewett Wires.Tial 46mm WG, Tial 50mm BOV, WEVO Shifter,934 Boost Gauge, Wideband EGO Sensor/Gauge, C2T Head Gaskets, '88 MB 300TE,BMW R100RT
Old 03-19-2008, 03:54 PM
  Pelican Parts Technical Article Directory    Reply With Quote #26 (permalink)
 
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pretty cool huh Spence? I remember my first drive
Very Cool Jerry! Thanks for all your help and advice too, you really helped me out.
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Old 03-19-2008, 05:53 PM
  Pelican Parts Technical Article Directory    Reply With Quote #27 (permalink)
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