Benefit of SAI delete

[Terry.Reese]

So i am pretty sure my kombivalves are going to hell, keep getting codes for them, no airplane sound coming from pump (thankfully), what is the benefit of doing a SAI delete? Note: Temps can get to -24 degree Fahrenheit here, and +120 degrees. Heard stories where the SAI delete makes the car take forever to warm up.. should I then put an oil heater line in that plugs to my house, Have an outlet right next to where i park my car.

Thank you for your help.

[ottocycle]

SAI is used to inject air into the exhaust stream to help burn off fuel when you first start the car. It also heats up the catalytic converter quicker to help with emissions. Do you need it? No. Does it effect how fast your car warms up? Yes and No. No, as in it does not effect how long your go fast parts take to warm up(motor, trans, diff) Yes, as in your emissions equipment.

[MacFady]

Heard stories where the SAI delete makes the car take forever to warm up..

Those are just "stories". Speaking as someone who lives somewhere where the temps are -40C to +35C and having an SAI pump that is still installed but has not worked for 4 yrs I can tell you it makes no difference in how quickly your car heats up, just your CAT, which you wont notice.

[Terry.Reese]

Thank you guys, dont want to waste money on them if I can just do a delete. can you turn the CEL light for them off with VAGCOM or does it have to be a specific tune to do that.

[MacFady]

As far as I'm aware you cannot permanently remove the CEL via VCDS, it needs to be tuned out. That being said, when it's below 0C it doesn't run anyway so for example from approx. Nov.-Mar. where I live I don't get a CEL for SAI "implausible signal".

[dmanisgnarly]

No benefit other than eliminating a potential code. Thank uncle sam for the SAI, its purely a government device to help with emissions. Delete it and gut the precats and ge ta JHM tune=problem solved.

[Tugboatguy]

Air pump is just an electric motor correct?
It comes on runs for a set period of time and then turns off, you should be able to delete it and add a resistance at the wiring connector to complete the circuit and fool the ECU into thinking it's still there.
Just need to figure out the right resister?

[RHawk]

Does anyone have a walk through or parts list for a b7 sai delete? Just wondering what to do, I have a random misfire code and secondary air pump code, dont hear the pump at all, don't really want it anyway. I'd love to get rid of it, but where do I start?

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[mark_ma]

The only way I know how the cel is removed, is I got the jhm tune with the sai delete code option. I also noticed I got better fuel efficiency with that part being deleted. At the time I did the tune all components where still installed. Since I’m doing my timing now, I can now remove all that mombo jumbothats not needed. The time I installed the tune I already had catless down pipes. So it would of been a wast of energy to warm something that’s not there anymore


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[RHawk]

The only way I know how the cel is removed, is I got the jhm tune with the sai delete code option. I also noticed I got better fuel efficiency with that part being deleted. At the time I did the tune all components where still installed. Since I’m doing my timing now, I can now remove all that mombo jumbothats not needed. The time I installed the tune I already had catless down pipes. So it would of been a wast of energy to warm something that’s not there anymore


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Nice, see my car is totally stock. I've got a random misfire and I believe it's due to the sai pump. I'm going with catless downpipes for less heat and restriction, so it just makes sense to delete the sai, like you said why heat something that's not there? Is it possible to remove the diaphrams with the engine in? My timing is already done and I'd hate to have to pull the engine for 2 little block off plates. And next question is once blocked off, do you just leave the pump installed or is there a kit to remove that as well? I really don't mind leaving it on, but if I can remove it I would really like to.

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[RHawk]

The only way I know how the cel is removed, is I got the jhm tune with the sai delete code option. I also noticed I got better fuel efficiency with that part being deleted. At the time I did the tune all components where still installed. Since I’m doing my timing now, I can now remove all that mombo jumbothats not needed. The time I installed the tune I already had catless down pipes. So it would of been a wast of energy to warm something that’s not there anymore


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And also, I've been looking into the jhm tune, do I have to tell them what I want or do they just assume you have everything done such as catless downpipes and open intake? Because going catless I assume I will have a cel for o2 sensors, and I'd like to NOT have that problem after a tune, even though this is fairly inexpensive as tunes go.

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[mark_ma]

Nice, see my car is totally stock. I've got a random misfire and I believe it's due to the sai pump. I'm going with catless downpipes for less heat and restriction, so it just makes sense to delete the sai, like you said why heat something that's not there? Is it possible to remove the diaphrams with the engine in? My timing is already done and I'd hate to have to pull the engine for 2 little block off plates. And next question is once blocked off, do you just leave the pump installed or is there a kit to remove that as well? I really don't mind leaving it on, but if I can remove it I would really like to.

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And also, I've been looking into the jhm tune, do I have to tell them what I want or do they just assume you have everything done such as catless downpipes and open intake? Because going catless I assume I will have a cel for o2 sensors, and I'd like to NOT have that problem after a tune, even though this is fairly inexpensive as tunes go.

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im pretty sure you can remove it and place the block off plates without the motor being out, but with that being said it will be a tight squeeze.
If you want to, you can leave it in. all it is now will be dead weight after the tune. if removed you have more room and i would guess better air flow through the outer parts of the engine...( less clutter under the hood)
Its more of a DIY project bc to my knowledge no one sells a delete kit for the SAI.

when you go to the website ---> ( jhm tune ) <--- , you'll see all these option. and there is an option for "SAI Delete" and you would select yes, the option is an extra $50, but i believe in the long run its worth it, and if you get the tune without it, and you remove the SAI pump then you'll get a CEL pretty much saying where did SAI go?
And yes with out the tune you will throw another CEL code bc the o2 censors will read a higher air flow bc of no cats. And the tune erases that code. and for that there is no extra charge, its already a part of the tune

[RHawk]

im pretty sure you can remove it and place the block off plates without the motor being out, but with that being said it will be a tight squeeze.
If you want to, you can leave it in. all it is now will be dead weight after the tune. if removed you have more room and i would guess better air flow through the outer parts of the engine...( less clutter under the hood)
Its more of a DIY project bc to my knowledge no one sells a delete kit for the SAI.

when you go to the website ---> ( jhm tune ) <--- , you'll see all these option. and there is an option for "SAI Delete" and you would select yes, the option is an extra $50, but i believe in the long run its worth it, and if you get the tune without it, and you remove the SAI pump then you'll get a CEL pretty much saying where did SAI go?
And yes with out the tune you will throw another CEL code bc the o2 censors will read a higher air flow bc of no cats. And the tune erases that code. and for that there is no extra charge, its already a part of the tune

OK great thank you so much! Now I just need my wife to stop driving the car so I can start my project!

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[Terry.Reese]

Hmm, wonder what happens when you have a tune that has SAI delete and still have your SAI and not blocked off.

[RHawk]

Hmm, wonder what happens when you have a tune that has SAI delete and still have your SAI and not blocked off.

What does happen? Could those hoses and pipes, combi valves, be a source of vacuum leak? Maybe that's why my sai doesn't work in the first place, sometimes I hear the 'vacuum cleaner' sounds of the pump, sometimes not. And it comes and goes at different rpms (during warm up only) the pump isn't really necessary any way, so why keep it if it's programmed out of the equation?

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[nschultz]

JHM SAI Delete....

https://jhmotorsports.com/block-off-...w-4-2l-v8.html

[VinnysS4]

I don't think your random misfire has anything to do with the SAI system. Most likely either a vacuum leak if it's at idle or a coil going bad.
That being said. The SAI needs to be tuned out. No VCDS work I'm aware of.
I believe the combi valves stay locked in the closed position until they are commanded open via vacuum from the solenoid that controls the combi valves. This opens them and allows the process to continue. So you should be fine if you run a sai tune delete without removing it. The valves will just stay shut, blocking the exhaust ports on the heads.
You most likely have a Vacuum leak in the combi valve 1/8" emissions line(or somewhere to them) they are ran together to a T so if either has a leak, neither will operate.
You can remove the SAI pump and just unplug the connector. It's just dead space and weight at that point.
The combi valves can be removed without pulling the motor. Tho it does suck a fat one with almost no room to work.
The purpose of the whole thing is to get the catalytic converter up to operating temperature for the cleanest exhaust gasses, the soonest it can. Less pollution.
The block off plates can be made if you're handy with a band saw , drill and a grinder. I made mine in literally 5 minutes out of some 14 or 16 gauge 316 stainless.(can't remember)
If you need some good combi valves, I have a set laying around. Let me know

Cheers!

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[RHawk]

I don't think your random misfire has anything to do with the SAI system. Most likely either a vacuum leak if it's at idle or a coil going bad.
That being said. The SAI needs to be tuned out. No VCDS work I'm aware of.
I believe the combi valves stay locked in the closed position until they are commanded open via vacuum from the solenoid that controls the combi valves. This opens them and allows the process to continue. So you should be fine if you run a sai tune delete without removing it. The valves will just stay shut, blocking the exhaust ports on the heads.
You most likely have a Vacuum leak in the combi valve 1/8" emissions line(or somewhere to them) they are ran together to a T so if either has a leak, neither will operate.
You can remove the SAI pump and just unplug the connector. It's just dead space and weight at that point.
The combi valves can be removed without pulling the motor. Tho it does suck a fat one with almost no room to work.
The purpose of the whole thing is to get the catalytic converter up to operating temperature for the cleanest exhaust gasses, the soonest it can. Less pollution.
The block off plates can be made if you're handy with a band saw , drill and a grinder. I made mine in literally 5 minutes out of some 14 or 16 gauge 316 stainless.(can't remember)
If you need some good combi valves, I have a set laying around. Let me know

Cheers!

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Dang Vinny, always so good. Well I did swap coils from my b6 and it still did get a misfire, again randoms ( pretty much all 8 cylinders at one time or another had a code). But here's the kicker, it only misfire at idle and a quick rev will clear things right up, now it doesn't misfire all the time, but when it does it sounds like a cammed big block. A quick rev to 2500 and purrs like a kitten again. It may idle 20 minutes just fine, or 20 seconds before I go cammed out. So I think the vac lines might have something to do with it. My misfire has only happened at highway speeds two or three times, where I need to really throttle up to push through, but that is so rare and I still feel like it vacuum line related. I still need a better scan tool like the obdeleven or vcds, I just haven't figured out which one I want. My solus pro is really good, but not with vag vehicles. But going back to my sai pump, it sounds very sick, so I'd like to just delete the thing and be done with that. Maybe I will accidentally fix my vacuum issue in the process......

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