ok I found dinan "Big Bore" throttle body

[Bernanke]

hey guys, after searching for a while i figured out the actual dinan throttle body dimensions.

The stock throttle body is 64mm
The Dinan throttle body is 67.3mm

thats only a 3.3mm difference, which hardly seems worth it at all. I'm going to try to find something 10mm bigger than stock which should be roughly 74-75mm.

[yellowbullet]

put that baby in your car and you'll feel a difference. it's not the power increase but the throttle response is SO much more sensitive. like another board member said, it feels like a poor man's ltw flywheel.

[GQ_Style]

It doesn't seem like it's a lot but when you talk about airflow, any increase is substantial.

[Brinn]

That 3.3 mm translates into a 10% increase in airflow.

[Bernanke]

true but still comparing 3.3 to anything 8+ the difference is obvious. I just hope i can find a match, once i get my car here I will take the exact measurements.

i've been searching hard for possible replacements but NO ONE on this forums has even bothered to take measurements, its starting to piss me off. you think someone could just go out to there car for a few minutes and measure a throttle body's dimensions but i guess thats too much to ask from a fellow board member :rolleyes :shifty

oh well

[94-325i]

How about this
one (http://forums.bimmerforums.com/forum/showthread.php?t=235017) ?


true but still comparing 3.3 to anything 8+ the difference is obvious. I just hope i can find a match, once i get my car here I will take the exact measurements.

i've been searching hard for possible replacements but NO ONE on this forums has even bothered to take measurements, its starting to piss me off. you think someone could just go out to there car for a few minutes and measure a throttle body's dimensions but i guess thats too much to ask from a fellow board member :rolleyes :shifty

oh well

[uuc328]

damit, i wish i would'nt have sen this thread. oh well, another gotta have added to the list

[DocWyte]

Why don't you go out to your own car and take measurements rather than pissing on all of us?

[Hit_Apex]

true but still comparing 3.3 to anything 8+ the difference is obvious. I just hope i can find a match, once i get my car here I will take the exact measurements.

i've been searching hard for possible replacements but NO ONE on this forums has even bothered to take measurements, its starting to piss me off. you think someone could just go out to there car for a few minutes and measure a throttle body's dimensions but i guess thats too much to ask from a fellow board member :rolleyes :shifty

oh well

uprick

[Balthazarr]

lol ^

[Baby ///M3]

Big bore throttle body by itself has a very minimal effect unless you use it in conjunction with other mods.

You're prob. better off going with other bolt on goodies.

Jon

[Ty Vil]

amen to that, the response is amazing.

[jmargo]

Once you go past 3 MM or so you get into the copper coolant tube. So you have to fill the tube with some sort of compound so when you cut through the tube it stays smooth.
I think any bore over 3mm is overkill unless you are running 3.5 to 3.75 intake tube.
Plus you could run lean from the extra air and not optimized software.

[roc64]

Big bore throttle body by itself has a very minimal effect unless you use it in conjunction with other mods.

You're prob. better off going with other bolt on goodies.

Jon
EXACTLY!!!

[WLightning22]

IMO dinan throttle body was one the best mods ive gotten for the money compared to other upgrades you get for trivial gains. I felt a much quicker throttle response and and get a lot better air flow.

[roc64]

WLightning22, I noticed that you have Stage4 as well but dont list an aftermarket exhaust? I thought with your "listed" set-up you would use the stage3 download? By the way, I love your car!!! :alright

[roc64]

Duh, just noticed you have Triflo, my bust!

[Bernanke]

Why don't you go out to your own car and take measurements rather than pissing on all of us?

B/c I am 1000 miles away from my car, read the thread closely

[Bernanke]

Once you go past 3 MM or so you get into the copper coolant tube. So you have to fill the tube with some sort of compound so when you cut through the tube it stays smooth.
I think any bore over 3mm is overkill unless you are running 3.5 to 3.75 intake tube.
Plus you could run lean from the extra air and not optimized software.

thats why I'm trying to find a larger one so i can run it without having to do any boring of anykind. i have long since disconnected the coolant hoses to the TB.

[atlDinan3]

Ok I'm interested in adding the Dinan TB to my car but there is one thing I still dont understand... Using the "a chain is only as strong as its weakest link" theory, doesnt the ASC TB stifle any gains to be had by adding the Dinan TB? Even if you do CAI, HFM & TB, you still have the stock width butterfly/tb for the ASC so how do you get any real gains?

And I know some people remove the ASC but I prefer not to... too much rain in the ATL to do something like that to my daily driver...

Any thoughts?

[GotBHP?]

Ok I'm interested in adding the Dinan TB to my car but there is one thing I still dont understand... Using the "a chain is only as strong as its weakest link" theory, doesnt the ASC TB stifle any gains to be had by adding the Dinan TB? Even if you do CAI, HFM & TB, you still have the stock width butterfly/tb for the ASC so how do you get any real gains?

And I know some people remove the ASC but I prefer not to... too much rain in the ATL to do something like that to my daily driver...

Any thoughts?

Well heres my thought: dont waste your money, and that goes double if you dont want to remove the ASC throttle body.

[atlDinan3]

Well thats certainly been my position to date, however since so many people on this thread seem to think it makes a very noticeable difference I am wondering what their position on this is.

Any of you believers have a comment to this query?

[snafu]

I have the DINAN TB and left the ASC. My car revs faster and smoother...and it sounds a little deeper. Anyone who says you see no gains without the ASC removed is wrong.

[///M3ryder NY]

Ok I'm interested in adding the Dinan TB to my car but there is one thing I still dont understand... Using the "a chain is only as strong as its weakest link" theory, doesnt the ASC TB stifle any gains to be had by adding the Dinan TB? Even if you do CAI, HFM & TB, you still have the stock width butterfly/tb for the ASC so how do you get any real gains?

And I know some people remove the ASC but I prefer not to... too much rain in the ATL to do something like that to my daily driver...

Any thoughts?

absolutely true... However, for the thread starter, it doesn't apply. Hes got a 95 M3....

[WLightning22]

I think its all relative. You don't really get a noticable difference in performance after a small mod like exhaust or intake. The TB was the first mod I got to where I could and still can notice the quicker and more efficient throttle response. So like I said before, for the money, I'm satisfied.

[Bernanke]

UPDATE: hey guys.

appearantly the old 5-series and 7 series throttle bodies were 78mm!

if true, they could possible be a perfect candidate for the transplant. If anyone can help me verify that would be awesome.

anyways let me know thanks