Throttle Body diameter HELP....

[--alpina--]

Ok guys, just a quick question on this, what is the standard diameter on a normal stock 325i throttlebody and what is the big bore throttle body bored to, how many `mm` more is it...???


cheers in advance

[MONSPORT42]

Can't give you the figures but I took these when mine was being fitted.

[--alpina--]

Very nice and clean i must say.... have you fitted the throttle body yet???

[cliffybabe]

my bbtb made a diference im wel pleased with it

[MONSPORT42]

Had the bbt b on for nearly five years now. I did notice a difference at the beginning but I've since had a maf and ITG fitted and a complete r/r remap so it's now got lost amongst other mods. Mine's the car featured in in the 'Throttle Bodies' FAQ on the zones. I should mention that mine's a 2.7 conversion and has different power delivery characteristics to a stock 325.

[ed325i]

It cant be that much bigger, there isnt alot of metal to remove in the 1st place.
I am thinking about getting a m30 535 TB welded on to my 325 inlet.

[scotty86d]

It cant be that much bigger, there isnt alot of metal to remove in the 1st place.
I am thinking about getting a m30 535 TB welded on to my 325 inlet.

you will surely need the maf (taken out or think you can get a higher performance one, might be talking bollocks here though)and chip reset as well as the volume of air will be far greater than a 325 item

[ed325i]

It cant be that much bigger, there isnt alot of metal to remove in the 1st place.
I am thinking about getting a m30 535 TB welded on to my 325 inlet.

you will surely need the maf (taken out or think you can get a higher performance one, might be talking bollocks here though)and chip reset as well as the volume of air will be far greater than a 325 item

If you run MS you can do away with the air flow meter

[GDBN]

The volume of air is measured by the AFM ... nothing else.

And they do make a difference.

[--alpina--]

ok, all well and done.. any diameter measurements on it?

[MONSPORT42]

The zone shop quotes 17% more airflow but no dimensions. If I get time tomorrow I''ll take off my bellows and measure mine but I'm not too well at the moment.

[--alpina--]

Thanks MONSPORT42, i appreciate it very much for that, get well soon, then i get the diameter soon also


cheers you guys