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3.0 litre EGR/Butterfly/Swirl Mod
  #1  
Old 14-10-2008, 10:53 AM
stubbsy351 stubbsy351 is offline
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Exclamation 3.0 litre EGR/Butterfly/Swirl Mod

hey guys whats this egr/butterfly mod? ive seen a few people have it listed in there signature?
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  #2  
Old 15-10-2008, 08:08 AM
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EGR is exhaust gas return. A system that that distributes exhaust direct from the exhaust manifold to the inlet manifold to help reduce emissions ect.

It chokes the engine with carbon and affects engine performance in a negitive way.

The mod involves blocking the EGR pipe with a blanking plate and re-aranging the vacum hoses that control a butterfly in the inlet manifold. The butterfly closes the inlet manifold off (partialy I believe) to force the engine to ingest the exhaust from the egr.
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Old 21-10-2008, 02:42 AM
stubbsy351 stubbsy351 is offline
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so i suppose it would make a differance to eng performance? any pics of the hoses to be moved?
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Old 21-10-2008, 06:19 AM
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i'll se if i ccan find the other pics

you can disable swirl control valve but only if egr is blocked off.

i've had one person say their fuel ecomonmy went worse after blocking egr. however he also had intercoler and other mods which may have been the cause.

Last edited by tweak'e; 21-10-2008 at 06:24 AM.
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Old 21-10-2008, 07:29 AM
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Hi Tweak

I remember you talking about disabling the swirl control on another forum, how did you go with it, and what was the reasoning for disabling it?
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Old 21-10-2008, 10:26 AM
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it improves low down response. with no egr it simply chokes the motor a bit so its not really needed and has been running fine with it disabled for the last 20,000km or so.

i think its there to increase egr by blocking off half the air and running on one intake will help mix the egr with the air as it goes into the cylinder. it only operates when engine is hot (which is when egr is on) and up to 1700 rpm (i think). main butterfly operates up to 3000rpm.
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Old 21-10-2008, 11:26 AM
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Do you think it solves the flooding problem, I know with mine when taking off from an intersection for example if I let the revs die too much, down to 500rpm say, it doesn't really want to accelerate, it does eventually but it puffs smoke out the exhaust when it does it which leads me to think it's over fuelling, could this be the swirl control causing this?
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Old 21-10-2008, 09:41 PM
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i think thats EGR doing that. used to have that problem when i had the egr working. it used to bog down and blow big clouds of smoke.
the other ute (with no mods) that we have still does that where as mine doesn't.

if you have egr blocked i would disable swirl valve. with your chip it may make quite a bit of difference.
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  #9  
Old 22-10-2008, 02:06 AM
stubbsy351 stubbsy351 is offline
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cheers for the pics buddy will haver to have a tinker!
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  #10  
Old 22-10-2008, 06:30 AM
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The puff of smoke is unburnt fuel. At 500rpm the engine would be developing fark all torque.

Dont forget these engines are low compresion engines and rely on boost to make the power. A TD series engine would easily pull from 500rpm but there compression ratios are 22 to 1. A QD32 would do the same aswell.

EGR stands for Exhaust Gas Recirculation.

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