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08-04-2006, 09:02 AM
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#1 | ||
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Formally Kia Chaser
Join Date: May 2005
Location: Newcastle
Posts: 2,493
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Hey - What would happen if I permantly opened the IMRC valve (as it normally only opens at 3800 rpm?
Would this give me any gain or anything, or is it best setup as is?
__________________
Kia Grand Carnival (2006) Silver, Grill Mesh, Tints, Sidesteps (with lights), Towbar, 7" Touch Screen DVD Tuner with intergrated GPS & Bluetooth, Roof Mounted Flip Down 15.1" LCD Screen, Reverse Camera - 184Kw HSV Clubsport R8 VY (2003) Black, 6sp Manual, Coulson Seats, Red on black interior, Pacemaker extractors, Twin 2.5" exhaust, Custom Red 20" VE GTS Rims, Custom Red Stitching
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08-04-2006, 09:05 AM
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#2 | ||
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FF.Com.Au Hardcore
 
Join Date: Dec 2004
Posts: 12,083
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Top end power would remain the same, bottom end power would be lost. Leave it as is, the BBM on EF-AU is alteady pretty much optimal.
__________________
Older, wiser, poorer. Now in Euro-Trash. VW Coupe V6 4motion.
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08-04-2006, 10:13 AM
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#3 | ||
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TL40 Wagon?
Join Date: Dec 2004
Location: Sydney
Posts: 2,377
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Wire it up long run then short run and try it and see what you think.
If you can feel the diffrence a CAI makes you will feel the difference this makes. The long run works well 2500-3500rpm. The short run 4000-6000rpm. problem is neither od these powerbands is briad enough for a road car with a 4-5 speed box to use. The ecu switch over is there to fix this problem. The R&D Ford spent on designing and fine tuning this is something you just won't be able to improve on. |
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08-04-2006, 11:04 AM
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#4 | ||
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Regular Member
Join Date: Mar 2006
Location: North America
Posts: 282
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It will probally have a bit of a lumpy idle
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08-04-2006, 12:35 PM
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#5 | |||
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TL40 Wagon?
Join Date: Dec 2004
Location: Sydney
Posts: 2,377
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Quote:
Where do you get these ideas from? |
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08-04-2006, 12:39 PM
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#6 | |||
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Miami Pilot
 
Join Date: Jan 2005
Location: ACT
Posts: 21,701
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Quote:
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The Hammer: FG GTE | 376rwkw | 1/4 mile 11.793 @ 119.75mph 1.733 60' (4408lb) 1 of 60 FG MK1 335 GTEs (1 of 118 FG Mk 1 & 2 335 GTEs). Mods: Tune, HSD/ShockWorks, black GT335 19” staggered replicas with 245 & 275/35/19 Michelin Pilot sport 5s Daily: BF2 Fairmont Ghia I6 ZF, machine face GT335 19” staggered Replicas with 245s and 275s, Bilsteins & Kings FPV 335 build stats: <click here> Ford Performance Club ACT |
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08-04-2006, 01:13 PM
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#7 | ||
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Regular Member
Join Date: Mar 2006
Location: North America
Posts: 282
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See it all the time on Windstar mini vans, and it rarely sets a code in the ECM
Maybe the people up here are a little more picky than down there with idle quality as they spend more time in traffic jams |
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08-04-2006, 01:57 PM
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#8 | ||
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Miami Pilot
Join Date: Jan 2005
Location: ACT
Posts: 21,701
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Don't those windstars run a V6? We are talking about a straight 6 here.
__________________
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The Hammer: FG GTE | 376rwkw | 1/4 mile 11.793 @ 119.75mph 1.733 60' (4408lb) 1 of 60 FG MK1 335 GTEs (1 of 118 FG Mk 1 & 2 335 GTEs). Mods: Tune, HSD/ShockWorks, black GT335 19” staggered replicas with 245 & 275/35/19 Michelin Pilot sport 5s Daily: BF2 Fairmont Ghia I6 ZF, machine face GT335 19” staggered Replicas with 245s and 275s, Bilsteins & Kings FPV 335 build stats: <click here> Ford Performance Club ACT |
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08-04-2006, 03:13 PM
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#9 | ||
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Formally Kia Chaser
Join Date: May 2005
Location: Newcastle
Posts: 2,493
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What I want to know is the difference if done. I don't really want to have to fiddle around wit it. Is there a difference at openening the short run at a lower rpm?
__________________
Kia Grand Carnival (2006) Silver, Grill Mesh, Tints, Sidesteps (with lights), Towbar, 7" Touch Screen DVD Tuner with intergrated GPS & Bluetooth, Roof Mounted Flip Down 15.1" LCD Screen, Reverse Camera - 184Kw HSV Clubsport R8 VY (2003) Black, 6sp Manual, Coulson Seats, Red on black interior, Pacemaker extractors, Twin 2.5" exhaust, Custom Red 20" VE GTS Rims, Custom Red Stitching
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08-04-2006, 03:47 PM
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#10 | ||
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Guest
Posts: n/a
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you can disconnect, just pulll the vac hose off where it connects to the little plunger at the front of the bbm , put a screw or someting in the hose to block it off . try it for yourself and see what it dose.
i tried it while i was at the drags one night and it didn't make one bit off difference to my times .going buy the seat of your pants feel ,it makes it feel like a slug down low. |
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09-04-2006, 01:09 AM
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#11 | ||
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Regular Member
Join Date: Mar 2006
Location: North America
Posts: 282
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Yes, Windstars are V6 but it should still have the same effect on an I6
All the IMRC's I've seen default to open or high speed mode when anything goes wrong So at idle, the air velocity is too slow causing poor fuel atomization & a bit of a choppy idle |
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09-04-2006, 07:11 AM
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#12 | ||
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Formally Kia Chaser
Join Date: May 2005
Location: Newcastle
Posts: 2,493
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lol so funny - Yesterday I did some mods to my airbox, and I now get this awsome deep intake roar only when I put my foot flat to the floor. Funny this is, the roar stops dead as soon the the IMRC Valve opens.
__________________
Kia Grand Carnival (2006) Silver, Grill Mesh, Tints, Sidesteps (with lights), Towbar, 7" Touch Screen DVD Tuner with intergrated GPS & Bluetooth, Roof Mounted Flip Down 15.1" LCD Screen, Reverse Camera - 184Kw HSV Clubsport R8 VY (2003) Black, 6sp Manual, Coulson Seats, Red on black interior, Pacemaker extractors, Twin 2.5" exhaust, Custom Red 20" VE GTS Rims, Custom Red Stitching
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09-04-2006, 09:34 AM
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#13 | ||
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TL40 Wagon?
Join Date: Dec 2004
Location: Sydney
Posts: 2,377
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Lets knock this one on the head.
At idle in drive or neutral even with my dev3HL cam idling at 550 or 750 rpm I can grab hold of thr BBM lever and put it into short run from long run and it makes no difference. Exactly as I suspected it would. |
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09-04-2006, 10:10 AM
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#14 | ||
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Formally Kia Chaser
Join Date: May 2005
Location: Newcastle
Posts: 2,493
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Ok, so if it makes FA difference, why have it at all. Not another Brock invention is it?
__________________
Kia Grand Carnival (2006) Silver, Grill Mesh, Tints, Sidesteps (with lights), Towbar, 7" Touch Screen DVD Tuner with intergrated GPS & Bluetooth, Roof Mounted Flip Down 15.1" LCD Screen, Reverse Camera - 184Kw HSV Clubsport R8 VY (2003) Black, 6sp Manual, Coulson Seats, Red on black interior, Pacemaker extractors, Twin 2.5" exhaust, Custom Red 20" VE GTS Rims, Custom Red Stitching
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09-04-2006, 10:14 AM
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#15 | ||
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FF.Com.Au Hardcore
Join Date: Dec 2004
Posts: 12,083
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it makes a LOT of difference when the revs are up at about 4000rpm. Makes no difference under that... and if its forced into short runner mode has no real effect on idle as Jonbays said.
__________________
Older, wiser, poorer. Now in Euro-Trash. VW Coupe V6 4motion.
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09-04-2006, 10:19 AM
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#16 | ||
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Formally Kia Chaser
Join Date: May 2005
Location: Newcastle
Posts: 2,493
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What I mean by that is, if it makes no difference down low being fully open, but needs it open at high revs, why doesn't it just stay permentally open?
__________________
Kia Grand Carnival (2006) Silver, Grill Mesh, Tints, Sidesteps (with lights), Towbar, 7" Touch Screen DVD Tuner with intergrated GPS & Bluetooth, Roof Mounted Flip Down 15.1" LCD Screen, Reverse Camera - 184Kw HSV Clubsport R8 VY (2003) Black, 6sp Manual, Coulson Seats, Red on black interior, Pacemaker extractors, Twin 2.5" exhaust, Custom Red 20" VE GTS Rims, Custom Red Stitching
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09-04-2006, 10:26 AM
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#17 | ||
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FF.Com.Au Hardcore
Join Date: Dec 2004
Posts: 12,083
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it needs to be closed after you move off idle up to ~3500rpm as thats when the long runners are more efficient. After that short runners are more efficient. Its providing th best of both worlds. What happens at idle is irrelevant as there is no load on the engine so it makes no difference what setting its in.
__________________
Older, wiser, poorer. Now in Euro-Trash. VW Coupe V6 4motion.
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09-04-2006, 11:31 AM
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#18 | ||
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TL40 Wagon?
Join Date: Dec 2004
Location: Sydney
Posts: 2,377
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What I meant to say was at idle switching it manually from LONG RUN to short run makes no difference!
These BBM manifolds run long path from idle to 3800rpm then switch to short path. At idle with no real intake flow or velocity of the intake charge the BBM has little impact! |
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09-04-2006, 02:33 PM
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#19 | ||
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Regular Member
Join Date: Mar 2006
Location: North America
Posts: 282
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The proof is in the scan tool... If you watch Long & short term fuel trims
, you would see that the ECM compensate about 8-10% for the abnormal air flow at idle A code won't be set until the 15% threshold is broken |
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Intake Manifold Runner Control
Linear Mode
