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PostPosted: Mon Mar 27, 2017 5:13 am 
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2 BBL ''SuperSix''

Joined: Wed Jan 14, 2015 5:27 am
Posts: 23
Location: Tiffin, Ohio
Car Model*:
Hello all,

My turbo\EFI build. Using 8pin GM Electronic Ignition Module, triggered from Chrysler Electronic Distributor. 1986 Pontiac Computer firing MPFI. Twin Nissan 300ZX Turbo's. All systems are working, pulsing injectors and have good spark. Doing some final wiring and only hours away from firing it up!!!

So.... How does the vacuum advance work on these turbo charged cars? Is there a boost level at which I will be pressurizing the system rather than creating vacuum? The car (71 Plymouth Valiant) is a street/strip. Mostly street. Has anyone ported the vacuum ahead of the turbocharger rather than from the intake manifold/throttle body?


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PostPosted: Tue Mar 28, 2017 9:05 am 
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Supercharged
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Joined: Thu Jan 27, 2005 8:32 pm
Posts: 7120
Location: SW Washington
Car Model*: C1-B8
Why isn't the computer controlling the timing?

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Car nut, telecom tech, tool using mammal
1954 Dodge C1-B8, 241 poly-head V8


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PostPosted: Tue Mar 28, 2017 11:24 am 
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Board Sponsor & SL6 Racer
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Joined: Fri Nov 08, 2002 4:48 pm
Posts: 5865
Location: Burton BC canada
Car Model*:
You should have a 3 Bar MAP sensor in your plan.


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 Post subject: Vacuum
PostPosted: Fri Mar 31, 2017 9:40 am 
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2 BBL ''SuperSix''

Joined: Wed Jan 14, 2015 5:27 am
Posts: 23
Location: Tiffin, Ohio
Car Model*:
Maybe the computer will control the timing? What would you recommend setting initial timing to? THANKS

Ill check on the MAP Sensor. I thought they were all 1 Bar MAP sensors.


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PostPosted: Fri Mar 31, 2017 10:25 am 
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EFI Slant 6
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Joined: Sat Sep 13, 2014 8:25 am
Posts: 374
Location: Springtucky OR
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A 1 bar sensor would be out of range at anything beyond atmospheric pressure and be out of range with any boost. A 2 bar sensor would be good up to almost 15 psi boost. 3 bar up to almost 30, etc.

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PostPosted: Fri Mar 31, 2017 12:40 pm 
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Board Sponsor & SL6 Racer
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Joined: Fri Nov 08, 2002 4:48 pm
Posts: 5865
Location: Burton BC canada
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On those CPUs the initial timing is 0

The trick is to get it to idle at 0. That's a good test of your initial setup.

The whole Idea of a 7/8 pin module is to control timing.
Get a MSD module .

You will need to get a new chip burned for your cpu....or....you will quickly move to a more flexible system.

Id get it running without any boost first.


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