bbc

[TZimmz]

i have a rhd supra and i am wondering if the bbc for the american supra would be compatable.

[pwpanas]

Originally Posted by TZimmz

i have a rhd supra and i am wondering if the bbc for the american supra would be compatable.

BBC? Big Brake Cover? British Broadcasting Corporation? Oooooooooooh....I bet you mean "BCC". ROFL.

Hokeydokey, here goes: Nope, don't use it. On a japanese-spec Mkiv TT, the TPS (Turbo Pressure Sensor - no cover sheet required) signal is used to control your injectors. The BCC clips the TPS signal just below boost cut, which means all the charge air past the boost cut point would get no extra fuel. Can you say melted pistons?

If you're interested, this doesn't happen with us-spec because the injectors' rate is primarily controlled using the MAF signal; the main thing that the TPS is used for is fuel cut. (I'm not 100% sure but it may also be used to control the 9v<->12v operation of the fuel pump.)

Now, how do you limit fuel cut on a japanese-spec Mkiv TT? A prize of limited value will be awarded to the forum member that answers this question prior to this Sunday March 27th, 2011 at 9pmEST.

[TZimmz]

hmm i dont like how that sounds. but is there a way around it? example bigger injectors?

[pwpanas]

Originally Posted by TZimmz

hmm i dont like how that sounds. but is there a way around it? example bigger injectors?

I don't know the Japanese-spec Mkiv that well, but I believe the HKS FCD together with a fuel controller (eg. An A'PEXi SAFC) would solve the problem. The FCD reduces the TPS sensor reading on a linear scale...couple that with the same linear increase in the fuel curve and you should have a solution.

[TZimmz]

so do i still need the BCC? or would the fcd and the fuel controller be enough?

[pwpanas]

Originally Posted by TZimmz

so do i still need the BCC? or would the fcd and the fuel controller be enough?

The FCD and the BCC serve exactly the same purpose...they just do it in different ways. There's no need to purchase them both.