Throttle area conversion from 78mm to 90mm.

[PRAY]

What is the correct Throttle Area Conversion for a 90mm TB? I think stock it is .2xx. I was running .320 but I read it was .330 some where else. So what is the correct number to put in that table? I don't have the table number in front of me but I can post it up later if no one knows what I am talking about.

Brett

[Ninety8C5]

This was in another post about resizing TB. I don't remember which and can't find it right now.

[PRAY]

The attachment won't open. It says it is corrupted. So if you could find the number I would really appreciate it.

Thanks,
Brett

[Ninety8C5]

According to the spreadsheet the increase should be 133%.

[Bruce Melton]

I used .0330 for 402 ci and .0355 for 427/441. I think all you are really doing is cracking the TB blade for idle., but it works if you need it.

[PRAY]

Thanks. That is what I was looking for. I actually think it was one of your posts that I was reading that gave me the .0330. I am running a pretty big cam for my 383 so it is demanding air. I will mess with that and see what happens.

I will also do the math for 133% and see what that comes up to.

Thanks guys.

Brett