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Mpi Throttle Restriction


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#1 Tones61

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Posted 11 June 2019 - 04:29 AM

Hi guys, on my mpi there is a throttle restriction plate/bracket at the throttle body,
Is there any gain in taking/modding thus for full throttle?
Thanks👍

#2 Fast Ivan

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Posted 11 June 2019 - 06:35 AM

Hi guys, on my mpi there is a throttle restriction plate/bracket at the throttle body,
Is there any gain in taking/modding thus for full throttle?
Thanks

 

none whatsoever



#3 Alice Dooper

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Posted 11 June 2019 - 08:58 AM

It was a modification that was done on the original MPI Cooper S.

Haven’t heard of anyone that says it makes a difference, though it does sound logical to remove any restriction

I did the original modification to mine by grinding it back with a dremel using an ARC4 code reader and got the butterfly to fully open. Didn’t really notice anything different, perhaps on a race tune engine on a track the difference might be slight.

A clean K&N filter on the other hand does make a wee difference to the breathing.

#4 Tones61

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Posted 11 June 2019 - 04:45 PM

Ok thanks guys,I have a k&n element and holes at front of air box,
just tweeking before my race spec head,1.5 rollers,mappable throttle bodies,just put on a maniflow stainless lab and rc40 system,✌




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