Anybody using the 78 mm BBK Throttle body and housing?

[Mattstang04]

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]

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]

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

 

[Jhussey1280]

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]

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.

Was that the only mod you did at the time?

 

[Mattstang04]

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]

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.