OBX ITB's

[vinnY]

what of the itb's would need adjusting though? throttle plate itself?

[Chr1s]

Yeah, they can go out of sync and all that.

Fatboyz - Do you know if there is different series of OBX itb's? They claim 48mm for B series, from what I've heard they are actually 43mm or someting at the plate, which is quite misleading and 52mm (for K series) if going by their false info would be smaller again.

[mnc]

What kind of filters would you need to use for these?

[geeang]

What kind of filters would you need to use for these?

Sock filters, or you can use an airbox with a traditional intake.

[chubby steve]

thanks 4 all the info guys alot of info i can work with wen i get the money or the cars run in i think ill give them a go

[mnc]

Sock filters, or you can use an airbox with a traditional intake.

ahh thanks! so thats what they are called. Sock filters.

[DNYALL]

I had to call up 'UNI-Filter' and get some custom sock filters made up for my quads. decided running them in a box all the time is weak haha I don't know how people run them open though. if u happen to drive down a dirt road or on a really wet day, wouldn't there just be too much risk for damage... I guess, not many people would run them open on a daily.

[Chr1s]

Why is running them in a box weak? It's the best way to run them.

Sock filters over them defeats the purpose of a velocity stack.

[geeang]

Why is running them in a box weak? It's the best way to run them.

Sock filters over them defeats the purpose of a velocity stack.

Having the sock filters on the trumpets makes little to no difference on the performance compared to running them open.

During tuning we did back to back runs with/without sock filters and the difference negligable.

If you ran a box w/ good ducting and a super high flow filter I'd see them running more efficiently though.

[Chr1s]

I cbf anymore

[chubby steve]

well i was gonna just have the cf box and run a cai off them would that b good enough i think running them open on the road would attract more attention than i want

[TODA AU]

During tuning we did back to back runs with/without sock filters and the difference negligable.

We must have been doing somethig wrong then...
Without any change to the tune, just removing socks adds 8hp to the wheels.
More found with further tuning.

FWIW, A well though out airbox is best... Done right you get the best of both worlds... Smooth idle, awsome response, excellent top end, solid mid range & quite
(while more powerful than open trumpets)
Quads + resonant plenum + short ram + CAI

An airbox that is not so well thought out generally does the opposite.

Chris, the OBX quad looks to be based (dead copy of) on the old design, now discontinued Toda quad.
Throttles are based on 4AG AE101 43mm, but are not genuine so can stick.
Butterfly is 43mm, intake throat can be up to 48mm
M&M are the only company I am aware of that comercially produced an airbox for this older style of quad throttle.
The plenums they sold were alloy.
(See pics below)
Toda's new quad is a different design & available as 45mm or 50mm throttles



I'm not sure if the M&M parts are still available but at least it'll give you the idea.
(Not too hard to do yourself if you're handy with a tig & a hack saw)
Cheers

Adrian