OBX ITB's

[Chr1s]

Thanks for the insight adrian, much appreciate it.

I've decided i'm going to get a set of these cheap OBX throttles and open them up abit/have custom throttle plates made in reach of a 50mm throttle plate, we'll see how thick the casting is on the actual throttles before I make any further statements haha

Apparently, now yes this is the internet - the new OBX throttles are 45mm at the plates, so they must be using the AE111 throttles? Which are 48->45mm from memory

Whats your experiance with 45mm throttles on a B series? More in particular 2.0L. Without pulling out the mathematical models and all that and ignoring, further from the port the larger throttle diameter is needed, etc. Lets say the old toda style throttles on a 2.0L, choke the system by far?

[TODA AU]

I've decided i'm going to get a set of these cheap OBX throttles and open them up abit/have custom throttle plates made in reach of a 50mm throttle plate

If they're AE101 or AE111 either way it's a bad idea... You've been told... LOL

Re 45mm throttles... a rough guide is as follows:
45mm throttles for 1600cc~1800cc
50mm throttles for 1800cc~2200cc
The throttle size is also affected by VE, cams, compression, exhaust etc
Further the length play a big part... (Depending on airbox & arm length to filter box)
Without an airbox you need more manifold (quad) length, with an airbox, you get away with some surprising lengths.
Cyl head intake port shape plays a big role too.
& some quad sets are a lot better than others...

[fat_85_civic]

would it be worth adding quads if the car was turbo?

[NSPYRE]

the nissan pulsar gti-r has individual throttle bodies and turbo...

[fat_85_civic]

i know that, but would their be significant gains in adding a set to a Honda motor which is turbo? Would it increase the mid-range or top-end? or maybe both?

[DNYALL]

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.

It might be the most efficiant/Legal way to run them, but I want to hear the sound of them all the time I have been running with the TWM air box (designed for the quads) for about 6 months now and, call me a doosh or wateva, but it just doesn't sound any different than a normal Single throttle/manifold setup. I want to hear it properly. Also doesn't quite look as good when you pop the hood

I'll run the sock filters for a while and see how the car go's. I will always have the option of going bak to the airbox + SRI setup.

I'll post pics up this weekend hopefully

Goodluck with your Quads mate, if u get em working properly you will absolutely love em

[rage_against]

what ecu you running with your quads mate?

[DNYALL]

I'm using Neptune ECU. seems to be doing the job nicely so far

[rage_against]

this may sound like a silly question, but, if you installed itbs yourself could you drive the car to get it tuned? or would it just not drive properly?

[xntrik]

If you got a base map to run it then yes.
If not then no.