Fordmods Logo

How to keep BBM open all the time? 

 

Page 2 of 2 [ 22 posts ] Go to page Previous  1, 2

 
Posted: Sun Mar 09, 2008 9:19 pm 
Getting Side Ways
Offline

Age: 45

Posts: 1329

Joined: 5th Nov 2004

Ride: 66 Coupe

Location: Perth
WA, Australia

connect the actuator directly to manifold vac, so it will only be in the long runner position when theres manifold vacuum.
Top
 Profile  
 
 
Posted: Tue Mar 11, 2008 5:29 pm 
Tyre Shredder
Offline

Age: 62

Posts: 373

Joined: 9th Feb 2006

Ride: AU Wagon

Location: Newcastle
NSW, Australia

This is something I'll probably play around with once I get the Raptor fitted. On the AU the short runners open at 3800rpm... with the mixer-ring LPG system in place the engine chokes briefly from about 3600 until the butterflies open... the manifold is designed to be "dry" & the LPG increases the volume passing through.

I'm inclined to think that the short runners should be used until about 3000rpm when the boost starts to kick in so as not to lose low-end torque. I'll be getting my tune tweaked to find the ideal RPM to open the butterflies. Easy enough on the AU with a flash tuner, which comes with the Raptor kit anyway.

You could probably do the same with the Eliminator chip, but 66 Coupe's suggestion "connect the actuator directly to manifold vac, so it will only be in the long runner position when theres manifold vacuum" has an appealing elegant simplicity to it.

 

_________________

AU1.5 Wagon, Raptor ProStreet kit, Pacemaker 4499's with 3" collector, 3" metal cat, 3" pipe, Pex BSO660 & BSO439, BA brakes, Sprintgas mixer LPG system, Airod variable-venturi mixer... stealth FTW Sniper tuned!

To be updated... soon!

Top
 Profile  
 
 
Posted: Mon Mar 17, 2008 3:25 pm 
Fordmods Newbie
Offline

Posts: 1

Joined: 17th Mar 2008

Location: Melbourne
VIC, Australia

Quote:
You could probably do the same with the Eliminator chip, but 66 Coupe's suggestion "connect the actuator directly to manifold vac, so it will only be in the long runner position when theres manifold vacuum" has an appealing elegant simplicity to it.


wide open throttle you have no manifold vacuum ( anywhere along the manifold runners after the throttle body.

on forced induction engines ( ie positive manifold pressure ) at wide open throttle again no manifold vacuum you above atmosphere pressure
Top
 Profile  
 
 
Posted: Mon Mar 17, 2008 3:52 pm 
Getting Side Ways
Offline
User avatar

Age: 45

Posts: 1228

Joined: 5th Mar 2006

Gallery: 25 images

Ride: FALCON EB TURBO, EL XR6

Location: Sydney
NSW, Australia

Ill post some pics later but i have setup a bracket with a spring to hold the butterflys closed untill the turbo pressure reaches 7psi, then the pressure from the manifold (ive hooked the line direct up to the manifold) over rides the spring tention and opens the butterflys. so not only do you have the benefits of long intake runners for torque off the line but a decent size (yeah i know not huge) plenum for top end performance.

 

_________________

FALCAHOLIC

IF AT FIRST YOU DON'T SUCCEED
DESTROY ALL EVIDENCE THAT YOU EVEN TRIED


Image

Top
 Profile  
 
 
Posted: Mon Mar 17, 2008 3:59 pm 
Fordmods Addict
Offline
User avatar

Age: 38

Posts: 7958

Joined: 1st Jun 2005

Gallery: 13 images

Ride: Falcon

Power: 237 rwkw

Location: Melbourne
VIC, Australia

FordRevHead wrote:
Quote:
You could probably do the same with the Eliminator chip, but 66 Coupe's suggestion "connect the actuator directly to manifold vac, so it will only be in the long runner position when theres manifold vacuum" has an appealing elegant simplicity to it.


wide open throttle you have no manifold vacuum ( anywhere along the manifold runners after the throttle body.

on forced induction engines ( ie positive manifold pressure ) at wide open throttle again no manifold vacuum you above atmosphere pressure

Exactly, thats the point, so it goes to short runners under WOT.

 

_________________

ED XR8 Sprint - S-Trim, V500, 249rwkw
BF MKII F6 Tornado - 237rwkw

Top
 Profile  
 
 
Posted: Wed Mar 19, 2008 11:13 am 
Tyre Shredder
Offline

Age: 62

Posts: 373

Joined: 9th Feb 2006

Ride: AU Wagon

Location: Newcastle
NSW, Australia

Steady ED wrote:
FordRevHead wrote:
Quote:
You could probably do the same with the Eliminator chip, but 66 Coupe's suggestion "connect the actuator directly to manifold vac, so it will only be in the long runner position when theres manifold vacuum" has an appealing elegant simplicity to it.


wide open throttle you have no manifold vacuum ( anywhere along the manifold runners after the throttle body.

on forced induction engines ( ie positive manifold pressure ) at wide open throttle again no manifold vacuum you above atmosphere pressure

Exactly, thats the point, so it goes to short runners under WOT.

Thanks... I wasn't sure how to respond to his post, other than to suggest that maybe he hadn't read the whole thread... or the title... LOL!

 

_________________

AU1.5 Wagon, Raptor ProStreet kit, Pacemaker 4499's with 3" collector, 3" metal cat, 3" pipe, Pex BSO660 & BSO439, BA brakes, Sprintgas mixer LPG system, Airod variable-venturi mixer... stealth FTW Sniper tuned!

To be updated... soon!

Top
 Profile  
 
 
Posted: Thu Mar 20, 2008 5:43 pm 
Tyre Shredder
Offline

Age: 62

Posts: 373

Joined: 9th Feb 2006

Ride: AU Wagon

Location: Newcastle
NSW, Australia

I just tested this with my vacuum gauge. There is steady vacuum from the HVAC vacuum reservoir (20 - 24 inHg) to the BBM actuator when the long runners are open, then atmospheric pressure when it switches over to the short runners at 3800rpm. So yes, connecting the actuator to manifold vac would work the right way around. It's then just a matter of how much vacuum is needed to keep the short runners open when you're off boost and at low rpm...

 

_________________

AU1.5 Wagon, Raptor ProStreet kit, Pacemaker 4499's with 3" collector, 3" metal cat, 3" pipe, Pex BSO660 & BSO439, BA brakes, Sprintgas mixer LPG system, Airod variable-venturi mixer... stealth FTW Sniper tuned!

To be updated... soon!

Top
 Profile  
 
Display posts from previous:
Sort by  
 Page 2 of 2  [ 22 posts ]  Go to page Previous  1, 2

Who is online

Users browsing this forum: No registered users and 34 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

 

 

It is currently Sat Nov 23, 2024 2:38 am All times are UTC + 11 hours

 

 

(c)2014 Total Web Solutions Australia - Australian Web Hosting and Domain Names