Whatever happened to that long thread about TB sizes and flow?

[95Vert]

I was asked, "Have you ever started a car w/o the intake by mistake?... I did, and there's no better throttle response than that." They've dyno'd different TB sizes and have come up with more power along the rpm's than the smaller one. I'm not sure if there's a TOO BIG, but I took it as there wasn't. We really didn't go into depth about the discussion because apparently I was the 1millionth person who had asked. All they said was that there's a lot of difference between theory and practice.

 

[HISSIN50]

And there were no side effects from the bigger TB on a daily driver? That seems kinda key to me.

If someone talks about a big difference in practice vs theory, I would ask for facts backing what was found during practice (dyno runs with both set-ups from the same session and with the car not coming unstrapped or being changed otherwise). Also, candid opinions about daily drivability would be nice too.

 

[95Vert]

I'll pm them and see what they tell me and I'll pm you back Hissin. I really don't want anyone to get upset or anything.

 

[5spd GT]

Who is this 'source'? I think I have a good idea who....

I like JT's thinking...go figure

Let's take a big EFI intake like the Victor 5.0 where the actual inlet (just after the throttle body bolt holes) is around 65mm, or a bit less. How is a 75 or 90mm throttle body helping the case? The intake can only take in so much. And yet I see people saying get the 75 or even 90 mm for 302's and some strokers (non-351 based).

Not all XXmm throttle bodies flow the same. One 65mm doesn't flow as much as another 65mm.

I have yet to see a definitive dyno run that showed an actual gain without some changes in between runs. Of all the time I have been on stangnet, I'm still searching...

You would think by now something would come up without other variables besides just a throttle body swap.

How can you get gains across the rpm range, like on a dyno for example that starts at 2,000 rpm. On a 302 that would imply that a 65mm couldn't flow at 2,000 rpm but a 75mm throttle body could flow plenty at 6,000 rpm. That does not make sense. Take a look at the thread I got above that JT posted on why gains are seen 'across the board'...