Dear A8parts, SAI picture please?

[Goran]

Dear A8 Parts,

I'm getting ready for my Secondary Air Injection delete.
Do you have a picture of the SAI piping that attaches the the back of a 4.2 FL block please?
I'm trying to confirm if his kit will fit. I tried to have a look today with a little camera, but its hard to tell if both sides are the same or if one is different.

Thanks!

http://www.034motorsport.com/engine-...8-p-21816.html

[notorious]

Goran, excuse me, I'm just curious, but why on earth would you want to delete secondary injection system? I thought it brings your cat to working mode faster. That probably means longer cat life...

[Goran]

Hi Sergey,
the pump is dead, costs a lot from Audi to replace. Infact, costs about as much as MRC coding to code-out SAI system and post cat lambdas.
I think the longer cat life is a myth. Pre-facelifts dont have the SAI system and their cats dont seem to last noticably less. I havent seen many (any?) posts on here or quattroworld of pre-facelift cats failing.
Also, the SAI system introduces more failure points for vacuum system.
Also, the SAI system and coding causes higher revs for 30 seconds on start up. I'm wondering if this can shorten the plastic cam chain guide life, as it causes a harsher start up when oil and pads are colder and more brittle.
Of course, there is the slight loss of weight too.
I'm going to put in those nice German HJS cats again, 100 cell, since they are cheaper than stock cats and have a lifetime warranty. This also means I dont want rear lambdas, again another expensive service item.

I was just going to add, SAI is there purely for Audi to meet Euro 3 emission standard, to reduce emissions on start up when mixture has to be extra rich.
From a physics perspective, I find it hard to believe that afterburning fuel on the palladium coated cat mesh surface is good for it. Of that rapid heating is good for it.

[notorious]

Thanks Goran. Understood. Will follow this thread with interest.

[Goran]

I fiddled around in there with a mirror and torch, I think the above kit will work.
On the 4.2 block both sides actually have 3 bolts to secure the 90 degree vent casting to the block. It looks like the 3-bolt blanking plate from the kit goes on the passanger bank, and the 2-bolt blanking plate goes on the drivers side (from RHD car perspective) using only 2 of the bolts.
I'm going to order the kit and hopefully book in with MRC when it arrives.

[Dave@A8parts]

Hi Goran

I have attached some photos of the back of the 40V block

Hope this helps

[Singh]

MRC coded my SAI system the same time they got rid of the cats (that's on my old one, this still has main cats).

[Goran]

Thanks Dave
and thaks Amar, its good to know someone else already got the MRC code

Blanking plates ordered, I cant wait to get it done
on a side note, looks like MRC sell 034 motorsport parts, so I could have ordered through them, doh!