ported AAN throttle body

[orignalS60]

Any shops or members offering a porting
service for stock AAN throttle bodies? 034
stopped offering this service. It brings the I.D.
from 65mm to 70mm. Any help is appreciated.

[dbojar]

If I can ask, what for??

[orignalS60]

I bought an Iroz intake manifold and
figured I could enlarge the throttle body
a little bit as well. Try to free up as much
flow as I can.

[JP]

I still do them at a cost of gb£180 incl aquablasting the whole unit to look as new but they come out at 69.3mm iirc as 70mm leaves too thin a clamping wall

[gnutz2]

What kind of power would you need to push for a 65mm throttle to cause a restriction, surely 2 inlet valves cause more of a problem to flow.

[diesel des]

Yea interesting this. With the compressor outlet of even big Turbos being 63mm and that's hot air?

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[JP]

Throttle body at 65mm with the cheese wedge removed does not offer a restriction at 99% of power figures that are available on pump. Going for a larger TB size allows for faster intake manifold filling resulting in a more responsive throttle. Actual power difference will be minimal.

[AndyP]

Throttle body at 65mm with the cheese wedge removed does not offer a restriction at 99% of power figures that are available on pump. Going for a larger TB size allows for faster intake manifold filling resulting in a more responsive throttle. Actual power difference will be minimal.

What's the purpose of the cheese wedge?

[JP]

Increased air speed at very small throttle low rpm situations to assist in preventing fuel not mixing properly

[diesel des]

What's the purpose of the cheese wedge?

Yep more progressive throttle arround town.

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[SteveH]

With the large throttle body on my inlet it's a bit jerky when cruising at almost zero throttle. not sure if that's a lack of wedge and larger apeture. It does respond to the throttle quickly though.

[diesel des]

With the large throttle body on my inlet it's a bit jerky when cruising at almost zero throttle. not sure if that's a lack of wedge and larger apeture. It does respond to the throttle quickly though.

Yep that would be it being less progressive. Not ideal on a daily ,good on a track car.

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[orignalS60]

JP pointed out alot of the
benefits to doing this mod.
034 and others also told me
I would have increased throttle
response which is what I was
mostly after.