hey guys whats this egr/butterfly mod? ive seen a few people have it listed in there signature?

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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D22 Nissan Navara STR ZD30
2" lift with Ironman Nitro shocks, Mickey Thompson 285x75x16 MTZ's, 3" mandrel exhaust, boost guage, oil catch can, EGR/butterfly mod, TJM snorkel & UHF/AM radio

so i suppose it would make a differance to eng performance? any pics of the hoses to be moved?

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.

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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Former 2003 D22 Nissan Navara STR ZD30 Driver - Now driving 80 series Cruiser

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.

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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Former 2003 D22 Nissan Navara STR ZD30 Driver - Now driving 80 series Cruiser

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.

cheers for the pics buddy will haver to have a tinker!

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.

Dave.

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2006 Polar white STR Navara ZD30DDT powered, Bilstien shocks, Nissan steel winch bar, warn XD9000 winch, Uniden UH-013 UHF, Kenwood head deck, Pioneer 6inch speakers, Ipod adapter, Ute lid, tray liner, Mickey Thompson Baja MTZ's 265/75/16, Nokia car kit, tray liner, Narva 225 Ultima spotties, 125L fuel tank, Catch can, GME AE4705 antenna, Airtec/Nissan snorkel. Now Intercooled, HID headlights and the Narva's have been converted to HID also. Dual battery kit going in soon. Finally.