beef27
Member
Registered: 2nd Feb 10
Location: Stoke-on-Trent
User status: Offline
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wot does this do?
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djgritt
Premium Member
Registered: 1st Nov 07
Location: Dorset Drives: Focus ST / Hyundai i20N
User status: Offline
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Blanks the Exhaust Gas Recirculation and Secondary Air Injection Systems.
EGR - assists in reduction of Noxious Emissions by injecting a proportion of Exhaust Gas into the Inlet manifold, to repeat the combustion cycle
SAI - injects air into the Exhaust Manifold to increase Exhaust Gas temperatures to bring the Catalytic Converter to optimum operating temperature quicker to assist in reducing Noxious Emissions.
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djgritt
Premium Member
Registered: 1st Nov 07
Location: Dorset Drives: Focus ST / Hyundai i20N
User status: Offline
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Both systems are not legally required to be operational, so can be disabled either by blanking or removal
The SAI System can be fully removed, the EGR system has to be blanked - I believe the EGR is incorporated into the ECU so cannot be fully removed without custom mapping or standalone engine management
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beef27
Member
Registered: 2nd Feb 10
Location: Stoke-on-Trent
User status: Offline
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does doing these make any benifits/ gains
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AlexW
Member
Registered: 25th Oct 08
Location: Essex
User status: Offline
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SAI clears up a big space in the engine bay, EGR's go wrong very offen and its cheaper than buying another EGR
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Root
Member
Registered: 28th Dec 08
User status: Offline
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quote:
Originally posted by beef27
does doing these make any benifits/ gains
yes, but there is probably no point doing this to a 1.4 or anything less. 1.6 upwards only and ideally above that, like 2.0.
But most people that blank the EGR, tend to have standalone management systems to optimize maximum power, thus they blank the EGR to stop interferrence with the standalone achieving this
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Root
Member
Registered: 28th Dec 08
User status: Offline
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my post is referring to the EGR system. I do not know much about SAI
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AlexW
Member
Registered: 25th Oct 08
Location: Essex
User status: Offline
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Engine size etc dont matter at all, the only real reason to is you might get 3bhp, but the main point is it can make it run better due to a iffy EGR valve.
Stand alone management wouldn't be affected by the EGR as you wouldn't have it plugged in!
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djgritt
Premium Member
Registered: 1st Nov 07
Location: Dorset Drives: Focus ST / Hyundai i20N
User status: Offline
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quote:
Originally posted by beef27
does doing these make any benifits/ gains
Negligible - mine has the SAI disabled/removed, and will be getting the EGR blanked when the Inlet is changed. Noticed nothing different atall, other than a little more space in the Engine Bay.
I had a Cav 2.0 16v and disabled the EGR on that, but left the SAI running. Only noticed a slightly smoother throttle response, but that could e because the EGR was likely to have starting to cock up.
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corsadonk
Premium Member
Registered: 4th Jul 09
Location: Marlborough, Wiltshire
User status: Offline
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Has anyone had trouble MOT time, emission wise? Also can you leave the sai unplugged and not get a light come up on the dash? Like the EGR.
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djgritt
Premium Member
Registered: 1st Nov 07
Location: Dorset Drives: Focus ST / Hyundai i20N
User status: Offline
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No MOT trouble on either of mine, as long as your engine is running well and the Cat is there / isn't fucked then it should be fine for emissions.
Yes, you can leave the SAI system unplugged with no ECU issues.
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Root
Member
Registered: 28th Dec 08
User status: Offline
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Usually is the CAT that causes the epic fail on emissions
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corsadonk
Premium Member
Registered: 4th Jul 09
Location: Marlborough, Wiltshire
User status: Offline
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quote:
Originally posted by djgritt
No MOT trouble on either of mine, as long as your engine is running well and the Cat is there / isn't fucked then it should be fine for emissions.
Yes, you can leave the SAI system unplugged with no ECU issues.
Great because I've got a 4-1 manifold, and Velos torque tube to go on.
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