BBK 78mm too much intake/plenum for N/A car?

Regulator · July 15th, 2009, 01:43 PM

I've got a lead on a pretty good deal for a BBK tb/plenum combo, part number is 1780. Apparently it's a one piece design 78mm throttlebody and plenum. I've been looking for a tb/plenum combo since I'm on a stock hand ported setup now, and I'm sure with the cams it would really breathe a lot better. But would a 78mm throttlebody/plenum be TOO much for an n/a car with cams and full exhaust?

BBK dyno graphs showed a 10hp increase on a bolt-on NPI car, but I'm sure those are probably heavily biased given they are trying to sell the product.

Boostang · July 15th, 2009, 02:32 PM

78mm is WAY too big unless your spinning your motor to 8k!
75mm is the BIGGEST id go with.. 70mm is what most pplp use!

AggieStang · July 15th, 2009, 02:44 PM

Unless you go forced induction there's no reason to upgrade the tb/plenum. It actually hurt my numbers to upgrade to a 75mm.

dcook_14 · July 15th, 2009, 02:59 PM

With an N/A car you'd probably be best off using a 70mm setup. Even with forced induction I think 78mm would be too big for most dd applications.

Scott2001GT · July 15th, 2009, 03:23 PM

75mm you will start to loose torque top end...so ya 78mm is to big

Regulator · July 15th, 2009, 04:05 PM

Don't you mean low end torque?

Scott2001GT · July 15th, 2009, 10:47 PM

well you torgue curve up top will drop off. so I heard from dyno test

July 15th, 2009, 01:43 PM	#1
Regulator Regular 1999 Mustang GT Join Date: Nov 2008 Location: Louisville, Ky Posts: 177 iTrader: 0 reviews	BBK 78mm too much intake/plenum for N/A car? I've got a lead on a pretty good deal for a BBK tb/plenum combo, part number is 1780. Apparently it's a one piece design 78mm throttlebody and plenum. I've been looking for a tb/plenum combo since I'm on a stock hand ported setup now, and I'm sure with the cams it would really breathe a lot better. But would a 78mm throttlebody/plenum be TOO much for an n/a car with cams and full exhaust? BBK dyno graphs showed a 10hp increase on a bolt-on NPI car, but I'm sure those are probably heavily biased given they are trying to sell the product. __________________ '99 GT FS/FT. Click here for details! "And I heard a voice in the midst of the four beasts, I looked and behold: a pale horse. And his name, that sat on him, was Death. And Hell followed with him."

July 15th, 2009, 02:32 PM	#2
Boostang Hardcore Enthusiast 1997 Mustang GT 11.01@128.32 Join Date: Jan 2009 Location: Seale, Alabama Posts: 1,748 iTrader: 0 reviews	78mm is WAY too big unless your spinning your motor to 8k! 75mm is the BIGGEST id go with.. 70mm is what most pplp use! __________________ If It Dont Flow It Wont Go!!! forged pistons,teksid block and a romeo cast cranks for sale.. pm if interested.. selling them for next too nothing

July 15th, 2009, 02:44 PM	#3
AggieStang WHOOP! 2002 Mustang GT 7.44@95 (1/8) Join Date: Oct 2007 Location: TEXAS Posts: 3,128 iTrader: 3 reviews	Unless you go forced induction there's no reason to upgrade the tb/plenum. It actually hurt my numbers to upgrade to a 75mm. __________________ Buy my: Nitrous Accessories Diablosport Programmer In The Classifieds

July 15th, 2009, 03:23 PM	#5
Scott2001GT BYAHHHH! 2001 Mustang GT 13.874 Join Date: Mar 2008 Location: Missouri Posts: 14,630 Blog Entries: 1 iTrader: 3 reviews	75mm you will start to loose torque top end...so ya 78mm is to big __________________ Precision Turbo\|TurboSmart\|TeamZ\|Strange\|Hellion\|BBK\|SCT\|Edge Converters\|Fairbanks\|CG Fabrications\|Treadstone 4V swap in the works

July 15th, 2009, 04:05 PM	#6
Regulator Regular 1999 Mustang GT Join Date: Nov 2008 Location: Louisville, Ky Posts: 177 iTrader: 0 reviews	Don't you mean low end torque? __________________ '99 GT FS/FT. Click here for details! "And I heard a voice in the midst of the four beasts, I looked and behold: a pale horse. And his name, that sat on him, was Death. And Hell followed with him."

July 15th, 2009, 02:59 PM	#4
dcook_14 El Danno 2004 Mustang GT 12.35@114.08 w/ 1.88 60' Join Date: Feb 2009 Location: Waterloo, IA Posts: 7,016 Blog Entries: 2 iTrader: 7 reviews	With an N/A car you'd probably be best off using a 70mm setup. Even with forced induction I think 78mm would be too big for most dd applications.

July 15th, 2009, 10:47 PM	#7
Scott2001GT BYAHHHH! 2001 Mustang GT 13.874 Join Date: Mar 2008 Location: Missouri Posts: 14,630 Blog Entries: 1 iTrader: 3 reviews	well you torgue curve up top will drop off. so I heard from dyno test __________________ Precision Turbo\|TurboSmart\|TeamZ\|Strange\|Hellion\|BBK\|SCT\|Edge Converters\|Fairbanks\|CG Fabrications\|Treadstone 4V swap in the works

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