7A-FE ITB Project Options

[morag]

I'm Starting Individual throttle bodies project on the 7afe.I'll be putting CBR954RR throttle bodies witch have 40mm inlet on the vacuumed side witch line up fairly good with the Stock 7afe intake manifold. The throttle bodies go from 44mm on the trumpet side to 40mm in the vacuum, witch i think will make good air velocity for the stock FE head.
I intend to make a vacuum box to collect the vacuum from the ITB's and spread them in the bigger hoses for brake,map sensor,Fuel pressure regulator and etc(I have yet to figure out all the detail). I will be using 315cc Supra injector witch i've tested with the stock manifold(And it goes way rich).
What has been done so far is that I've cut the stock intake(Which i've got from the junkyard) and tomorrow i will see where exactly will they match up. I intend to use the stock 7afe injector fuel rail and mount the itb's after it. Tomorrow ITB lining and cutting a bit more if needed. Ah and forgot i will be using stock 7afe map sensor, TPS sensor and cbr1000rr manual idle air controller. If anybody is interested in this I'll be happy to see your opinion. I hope I make all clear tomorrow I'll make some good pics on all parts so far and all i intend to do . See how this works out.

[Bitter]

You will probably only need injectors slightly larger than stock if at all since the limiting factor in head airflow on a 7A is the head, cams, and valves themselves. the intake system is not an impediment much. Stock cams stop making power at about 5800-6000RPM anyways and the bottom end will only take 6500 on a semi regular basis...maybe.

If the MAP sensor is not getting a steady vacuum signal then the fueling from the ECM is going to be all funky. Until you get cams, do some porting, get a longer runner exhaust manifold, tune it, and build the bottom end you'll probably not make much over stock power or possibly even less. The 7A is built for lower end torque and in stock form stops making power at 5500RPM. With some intake and exhaust/manifold you can get to around 5800-6000 before it wheezes out and won't go anymore. Once you start opening up the head though you'll realize than a G head would flow much better and a 4A-GE series engine (like a 20valve) is much more rev happy and suited to ITB, and is what you should have gotten to begin with. Can you make a 7A rev, yes. But you'll have to build it a little.