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uglybob
Technical Contributor
Age:24
Posts: 5829
Joined: 05 Nov 2004
Location: Leederville WA, Australia
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 Posted: Mon Jan 31, 2005 1:15 am Post subject: |
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| Timmeh wrote: | Where is this switch for the BBM on an EF? I'm guessing your not talk about the piping from the airbox because the EL just has the one? Got pics of what your talking about after the throttle body?
Cheers.
I know nothing about this BBM stuff your talking about. |
it switches automatically at 3500(?)rpm from the long runners to the short runners - its nothing to do with the airbox piping whatsoever. you dont manually switch it - the ECU controls the switching.
i'm sure someone with some REAL knowledge can fully explain it for ya, with pics!  |
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Nigel
Fordmods - Getting Side Ways
Posts: 1068
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Location: Sydney NSW, Australia
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| Posted: Mon Jan 31, 2005 8:17 am Post subject: |
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The BBM Switch is built into your EEC-V. It switches a vacuum solenoid behind the windscreen washer bottle in the engine bay, and that in turn moves the butterfly in the manifold so that the short runners are opened.
Nigel |
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Timmeh
Fordmods - Getting Side Ways
Posts: 6876
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Location: Perth WA, Australia
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| Posted: Mon Jan 31, 2005 8:44 am Post subject: |
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| Cheers guys. I think I'm getting closer to what your talking about. Is there different length runners in the 6cyl snail looking cast inlet manifold? |
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Spork
Fordmods - Getting Side Ways
Age:26
Posts: 516
Joined: 20 Dec 2004
Location: S.E. Melbourne VIC, Australia
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| Posted: Mon Jan 31, 2005 2:02 pm Post subject: |
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Yes,
I think you will also find that SVO XR6 and Waggin are running aftermarket ECU's and have full control over their BBM switching points + spark and fuel, I doubt it would make any difference adjusting the switching point in a stock car.
Also SVO XR6, your car must be sucking alot more air than stock, perhaps the resonant tuning of the BBM has been stuffed up and thats why your not seeing any gains on short runners?? I don't suppose anyone here is competent in 3D fluid dynamics modeling?  |
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neil101
Fordmods - Smokin em up
Age:27
Posts: 241
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Location: kellyville NSW, Australia
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| Posted: Mon Jan 31, 2005 7:42 pm Post subject: |
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The EEC-V switches the manifold at 3800, I am still running std ecu in my ED I have JJM cam,head and extractors on the dyno mine is pretty linier in torque curve and power hasn't flattened out it keeps climbing to the cut out (damn speed limiter) so maybe you might need to change it back to 3800 switch point and retune.
Neil |
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fast1
Fordmods Stock as a Rock
Age:25
Posts: 118
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Location: Sydney NSW, Australia
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| Posted: Tue Feb 01, 2005 11:24 am Post subject: |
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| Maybe a supid question with an obvious answer....whats BBM? |
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madmax
Fordmods - Getting Side Ways
Age:45
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Location: Skye VIC, Australia
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| Posted: Tue Feb 01, 2005 11:27 am Post subject: |
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| fast1 wrote: | | Maybe a supid question with an obvious answer....whats BBM? |
Broadband Manifold, EF onwards.
Inlet Manifold which changes length (shortens) once revs reach 3800rpm |
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jonbays
Fordmods - Smokin em up
Age:31
Posts: 284
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Location: x NSW, Australia
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| Posted: Tue Feb 01, 2005 7:53 pm Post subject: |
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| Timmeh wrote: | Where is this switch for the BBM on an EF? I'm guessing your not talk about the piping from the airbox because the EL just has the one? Got pics of what your talking about after the throttle body?
Cheers.
I know nothing about this BBM stuff your talking about. |
Its under the windscreen washer bottle. |
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