TPI plenum TB holes siamesed???
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Joined: Dec 2007
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From: Michigan
TPI plenum TB holes siamesed???
Been awhile since I messed with TPI. My last TPI I ported the plenum and siamesed the runner pair exits with good results. Later I saw someone siamese the throttle body holes and I wondered how that affected the tpi. Now it looks like I'll have another chance to mess with a TPI and I am debating on doing it.
Joined: Oct 2001
Posts: 12,214
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From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: TPI plenum TB holes siamesed???
Only needed if over a certain HP level.
Joined: Apr 2005
Posts: 7,736
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From: Not in Kansas anymore
Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
Re: TPI plenum TB holes siamesed???
Your flow restriction is the TB bores so as long as the holes in the plenum are larger (whether one hole or two ) should make no difference
I suspect you would have to go to a mono -blade TB for it to actually be useful
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