View Full Version : 75mm TB

11-08-2003, 02:53 AM
After receiving a BBK 75mm TB for free I ported my inlet plenum to match the new TB. I then put the car on the dyno to see what the difference was. It was down 9HP and 13LBFT. After about an hour of adjusting fuel pressure I ended with the exact same HP and a gain of one LBFT.

I thought this could be some good information for any prospective buyers.

XR7 Dave
11-08-2003, 07:27 AM
Some very good info. I suspected as much since I did not notice any gains when I put mine on.

Some people have reported a couple hp from the 70mm but there may be just too much necking down that occurs from the 75.

11-08-2003, 08:19 AM
What size/brand of MAF are you using?


11-08-2003, 10:59 AM
Tbird 88,
I'm using a 76mm C&L that gained 10RWHP on its own. You can see the rest of my mods on my member's page.

11-08-2003, 11:42 AM
Must be time for a Raised top.

Then you really liven it up with the MPII and Inlet plenum.