DIY: EGR Modification/Optimization (3.0L V6) - Page 11 - Mazda 6 Forums : Mazda 6 Forum / Mazda Atenza Forum
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post #101 of 136 (permalink) Old 11-03-2011, 03:59 PM
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Exhaust Smells

Hey all,

I just did my plugs and the EGR mod on my 03 6s and now im getting an exhaust smell in my cabin after driving a while and coming to a stop. Anyone else get this? It smells terrible and im worried i F-ed up something in the process. I put new air intake gaskets on and i've heard they may smell while getting broken in but this seems much worse.

Thanks,

DS18
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post #102 of 136 (permalink) Old 02-19-2012, 12:43 PM
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when lifting the IM off, how are you guys getting it past the EGR nozzle? i can lift it up about 1/2" then the EGR gets in the way and stops it from lifting off. I pushed on the EGR a little but the steel tube(exhaust gas line?) stops it from moving far enough out of the way so the IM can clear
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post #103 of 136 (permalink) Old 02-19-2012, 02:02 PM
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I was able to push the EGR module back far enough to squeeze the IM off once I removed all the bolts holding them together. It took a little force, but it's manageable.

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post #104 of 136 (permalink) Old 02-19-2012, 02:15 PM
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yea i got it, thanks for the quick reply though!
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post #105 of 136 (permalink) Old 03-02-2012, 04:39 PM
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just did this mod the other day, i feel as tho i have better throttle response not sure on the gas mileage i will be able to tell in a couple days when i get home to see if it jumped up have an 05 6 S hatch with 118k and get 28 mpg on the highway
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post #106 of 136 (permalink) Old 05-05-2012, 03:30 PM
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just did this finally..... after taking the im off do gap my plugs ....man did that tube ever get in the way of the flow wat a poor design

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post #107 of 136 (permalink) Old 01-21-2013, 01:27 PM
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No offense meant to anyone here--I'm all for modding a vehicle. In this thread I see all kinds of "in theory" and "feels better", but has anyone actually performed any tests (dyno, A/F, etc) to verify what's happening after this mod? Like I said, no offense but having worked for an OEM in the past, engineers always have something in mind for their designs and it's not like they just pull stuff from their behinds. Months or years of development take place, and I just don't see them going with a taller EGR tube "just because", especially if a smaller tube had benefits.

It all reminds me of the old V6 Taurus SHO and the "air horns" in the big intake manifold that had owners going nuts. Someone took apart their intake and found these metal tubes mounted in the front and rear sections of the mainfold directing air into the intake runners. This person thought "wow, those horns really restrict airflow... that's a stupid design!" and took them out. Other people started to do it, and each said how much harder the car pulled, etc. An engineer and SHO owner finally did a before/after comparison and found that removing the tubes added maybe 1-2 horsepower at the very end of the rev range (which on that motor was north of 7k) but lost 5-7 horsepower and similar torque figures (don't remember exact) down low. Those horns were there to better optimize a/f going into the engine at lower speeds, giving more usable power down low instead of a couple wasted ponies way up high. Obviously they had a very specific purpose.

I'd love to hear from anyone with some actual data on this mod? I've got some scheduled maintenance on the 6 coming up... I'm not opposed to doing this but I need more than "feels better" before I second guess the engineer that designed this setup

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post #108 of 136 (permalink) Old 01-21-2013, 01:44 PM
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DIY: EGR Modification/Optimization (3.0L V6)

Dont know about any before & after testing but it seems very logical to me. Stick your arm out the window while driving down the highway. Same idea. Its something in the path of air flow which will hinder flow & create turbulance. Aside from that, it makes removal & install of the plenum much easier.


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post #109 of 136 (permalink) Old 01-21-2013, 01:53 PM
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I have came across a dyno/logs charts a long time ago and it was very minimal like .25hp iirc but thats all i can remember

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post #110 of 136 (permalink) Old 01-21-2013, 02:47 PM Thread Starter
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ok, where in this DIY has it been stated that this mod is done to make power? please read the first post again. this mod is done to fix an airflow differential between the front and rear banks. YES there were MONITORED tests done to justify this mod. and the differences are listed in the first post.

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