Alternative intake system 42/GS twin throttle bodies!

Lozzer

Member
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2,280

Oishi

Member
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825
Would be good to see if any HP gains were had. IMHO the stock intake is restrictive.
 

Zep

Moderator
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9,110
Certainly looks interesting. It seems to be a single plenum, which is right for a cross plane crank. With 2 standard sized throttle bodies the part load mapping was probably not much fun. At 100 bhp per litre std I don’t think it was particularly restrictive as standard but the results would be good to see.
 

mjheathcote

Centenary Club
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9,033
There is one thing doing the mechanical mods, but how on earth do you control both throttle bodies and remap the original ecu... If it has the original ecu?
 

Zep

Moderator
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9,110
I think splitting the signal would be ok, perhaps with a multiplexer, but because they have double the area the two throttle bodies would flow too much air at low openings to give good throttle control. I would expect a custom map, perhaps using one for idle control and then opening both at wider throttle.
 

Oishi

Member
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825
Running an Alpha/N algorithm only won't give an increase over stock, no matter how much it may flow. Maybe MAP + MAT, and let the o2 sensors close the loop?