TPI Tuned Port Injection discussion and questions. LB9 and L98 tech, porting, tuning, and bolt-on aftermarket products.
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Old Jun 10, 2015 | 05:14 PM
  #1  
RedIrocZZ's Avatar
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From: North Carolina
Car: 1986 Camaro IROC-Z
Engine: 350 C.I.
Transmission: 700R4
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I need to know what vacuum lines from the TPI are really needed or can I just delete them all together??
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Old Jun 10, 2015 | 05:33 PM
  #2  
Tuned Performance's Avatar
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From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: Need Help Fast

These is only one vacuum line use on tpi. The ported vacuum signal to the egr solonoid starts under the throttlebody , goes to the egr solonoid then onto the egr valve.
I don't know if your counting the ccp as vacuum it's ported to the egr signal. Unless you are going to reprogram out the code 32 you should leave the egr vacuum lines intact.
The ccp why not vent the fuel tank into the engine.
The rh of the tb is the vent for the rh valve cover. This could be capped off if you goto a breather cap.
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Old Jun 10, 2015 | 06:03 PM
  #3  
RedIrocZZ's Avatar
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Joined: May 2014
Posts: 42
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From: North Carolina
Car: 1986 Camaro IROC-Z
Engine: 350 C.I.
Transmission: 700R4
Re: Need Help Fast






So what about these can they be capped off? Sorry if these questions sound stupid I'm a first timer to this stuff.
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Old Jun 10, 2015 | 06:41 PM
  #4  
RedIrocZZ's Avatar
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Joined: May 2014
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From: North Carolina
Car: 1986 Camaro IROC-Z
Engine: 350 C.I.
Transmission: 700R4
Re: Need Help Fast

Originally Posted by Tuned Performance
These is only one vacuum line use on tpi. The ported vacuum signal to the egr solonoid starts under the throttlebody , goes to the egr solonoid then onto the egr valve.
I don't know if your counting the ccp as vacuum it's ported to the egr signal. Unless you are going to reprogram out the code 32 you should leave the egr vacuum lines intact.
The ccp why not vent the fuel tank into the engine.
The rh of the tb is the vent for the rh valve cover. This could be capped off if you goto a breather cap.
[/QUOTE]




So what about these can they be capped off? Sorry if these questions sound stupid I'm a first timer to this stuff.
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Old Jun 11, 2015 | 07:50 AM
  #5  
MoJoe's Avatar
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From: Golden, CO
Car: 87 IROC
Engine: L31 350
Transmission: T56
Axle/Gears: 4.10 D44
Re: Need Help Fast

All vaccuum lines have a purpose/function. Determine if you are deleting that function, which then tells you which vaccuum lines you can eliminate.

Pic #1 - connection the AFPR to the smaller vac port.
Pic #2 - that goes to the power brake booster.

Attached Thumbnails Need Help Fast-afpr.png  
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Old Jun 11, 2015 | 05:27 PM
  #6  
Tuned Performance's Avatar
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From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: Need Help Fast

The other manifold vacuum fitting next to the fpr goes to your havac controls & cruise control if applicable .
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