SAI Delete

4.2 V8 40v biturbo - 450 bhp
4.2 V8 40v biturbo - 480 bhp (plus)
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111marc111
1st Gear
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Joined: Tue Aug 02, 2022 7:22 pm

SAI Delete

Post by 111marc111 » Wed Oct 30, 2024 4:16 pm

While i have my engine out I'm looking at this SAI. The pump, the combiner valves, all the associated pipework and vacuum lines all add future failure points, take up loads of room in the engine bay and as far as I can work out add very little to zero value.
I cant help but feel I'd thank myself in the future if they just weren't there and in the way, let alone if something in that system fails and needs fault finding.

My understanding is once the sai is deleted it needs coding out?
My car isn't mapped. I bought it as a totally standard car. I've fitted a non res milltek but I've not much interest in mapping the car if I'm honest. Is there a way of removing the sai and not triggering the EML? I'm not one to tolerate that constantly! Or does anyone know anyone or if it's possible for someone to simply code the sai out after physical deletion.

Thanks.

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Shoppinit
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Re: SAI Delete

Post by Shoppinit » Wed Oct 30, 2024 5:46 pm

In theory it’s an MOT fail if the emissions limiting systems are removed. Whether anyone would notice, who knows.

You can delete the SAI. You need to remove the combiner valves and blank them off (important). Then you have to code the SAI out of the ECU so it doesn’t cause a MiL. It’s fairly straightforward.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."

111marc111
1st Gear
Posts: 69
Joined: Tue Aug 02, 2022 7:22 pm

Re: SAI Delete

Post by 111marc111 » Wed Oct 30, 2024 6:03 pm

It's only emissions limiting for the first minute of a cold start and you'd have to be a specialist to notice its missing I would say. Average Joe MOT tester isn't likely to realise so I'm not too concerned in that respect.

The physical removal I'm not concerned about. It's the coding out electronically that I have no knowledge on. I understand you can get it coded out as part of a stage 1 tune but I'm not really after a stage 1 tune.
Was hoping someone may have done similar or knows someone with the skills on the coding side of things.

Mɐʇʇ
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Re: SAI Delete

Post by Mɐʇʇ » Wed Oct 30, 2024 6:56 pm

I just spent ages writing up what I did with the ECU and then, I am sorry, I thought "fkk it" - best bet for the ECU is to get someone else to code it out.
I DIY'd coding it out and while it worked perfectly, it was a lot of effort and I would have been better off paying someone to do that bit.

I think I've still got a copy of my Stage 1, SAI removed, map somewhere. :)
Probably about time I did an rm -fr on it all.
"not a professional engineer, mechanic and mechanist"

111marc111
1st Gear
Posts: 69
Joined: Tue Aug 02, 2022 7:22 pm

Re: SAI Delete

Post by 111marc111 » Wed Oct 30, 2024 9:33 pm

I've not got the confidence to go programming and coding myself. Sounds like a recipe for a bricked ecu to me!

Happy to pay someone... If there is anyone... anyone trusted too...

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