Anybody using the 78 mm BBK Throttle body and housing?

Mattstang04

15 Year Member

Sep 15, 2006

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St. Louis, MO

Mar 28, 2013

#1

• Mar 28, 2013

• #1

I already have a 70 mm with the TF Plenum. Im just curious if there is any worthwhile gains to be had by upping to BBK 78 mm. Not sure I want to spend $270 for 6 HP but maybe for 15. Is the 70 mm a limiting factor for my supercharger? Its bolted to a stock PI intake. Thanks

 

Jhussey1280

Member

Jan 31, 2012

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New Pal, Indiana

Mar 28, 2013

#2

• Mar 28, 2013

• #2

Well I know that they say the 78mm is great for forced induction applications and that if you run a 78mm on an NA application you actually lose power. Well being the person I am, I put a 78mm on my NA engine and went from 276hp 300lbs torque to 288hp and 314lbs of torque, so I can't say it was a bad investment. I think it would help your SC though since it helped my NA.

 

Mattstang04

15 Year Member

Sep 15, 2006

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Mar 28, 2013

#3

• Mar 28, 2013

• #3

10 HP/14 lbs of torque on a NA car is much better than I would have predicted. Nice.

 

Jhussey1280

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Jan 31, 2012

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New Pal, Indiana

Mar 28, 2013

#4

• Mar 28, 2013

• #4

Yeah I was super shocked, so was the guy who did the dyno lol, he said that it should have only been about 6/8 if that much. I can't explain it, but I have the dyno sheets to prove it hehe.

 

Gearbanger 101

Straight Outta Locash

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Mar 28, 2013

#5

• Mar 28, 2013

• #5

Jhussey1280 said:

Yeah I was super shocked, so was the guy who did the dyno lol, he said that it should have only been about 6/8 if that much. I can't explain it, but I have the dyno sheets to prove it hehe.

Click to expand...

Was that the only mod you did at the time?

 

Mattstang04

15 Year Member

Sep 15, 2006

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Mar 29, 2013

#6

• Mar 29, 2013

• #6

Did you run a baseline and then test it on the same day? Was there any difference in temperature and barometer between the days, if the pulls were done on separate days of testing?

 

Jhussey1280

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Jan 31, 2012

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New Pal, Indiana

Apr 1, 2013

#7

• Apr 1, 2013

• #7

It was base lined the same day, and he tweeked the timing some which I didn't know he did so the actual TB gains I'm not sure of now.