if you dont mind me asking, where did you purchase them from?

 

fuji racing (and I did read this thread before )

 

Alpha N is basically like being carbed. You have two metrics with Alpha N, TPS and RPM. Thats it. Much like a carburetor your tune really is only close to perfect in the conditions it it tuned in. With manifold absolute pressure and air inlet temperature, this is far easier to tune and can compensate for pressure differential due to altitude, temperature, weather, etc. long story short, speed density runs much better in most conditions and is easier to tune, but it can be hard to get a good common MAP reading between all of the throttles.

 

ok, thanks. it makes sense now.

so how are the itb's tuned with speed density? like what is it? finding the vacuum pressure and then tuning it based on those numbers?

 

To a degree. Instead of hard mapping like with Alpha N, (fixed injector load at at set RPM/TPS). There is still a target for for MAP/AIT readings under load but because the fueling is based on MAP and AIT aswell and not just RPM/TPS the ECU can correct on its own to a much greater degree for pressure, temp, etc. I ran my car Alpha N for a week, totally stupid for a street car.

 

What are the dimensions of the F2X intake ports?

Mines, what are the diameter of the horns on the ITBs?

 

Fuji Racing...

 

Gotta be glued together still. Ill let you know what we got away with length wise as soon as its done.

 

Anyone else notice their ITB's running a crapload better now that it's summer?

I've also noticed less carbon buildup on my exhaust tips...hmmm....

 

That is interesting, must have something to do with the weather paterns of your region.