ITB's to the original 16v

[JamesAE86]

is it possible to fit the 111/101 ITB's to the original ae86 engine or is it a waste of time? whats involved/needed and what cost?

[NoHachi]

Euhm..

Yes

Maybe; powerwise -> usually no

Adapter plate (eg T3)
Preferably a standalone

A lot

[Mux213]

James, found this on club4ag, not sure if its of any use to you :

club4ag Wrote:Another popular topic these days is adapting the individual throttles from the 20V onto the 16V..."Can this be done?" You bet! But there are many obstacles which may hinder your attempt and here's some of them. NO! you will not be able to use the 16V ECU to run the throttle as fuel map requirements are vastly different for the 20'v throttle unit. The lower rpm ranges require much less fuel while in the upper ranges the throttle needs significantly more fuel. Since the whole idea of making precise fuel maps are the key to making the difficult and sensitive 4 throttle to work well, it is not a matter of backyard tuning by simply shifting AFM or Vacuum Sensor signals or shuffling fuel pressures. You must almost always use an aftermarket or re-computed ECU get anywhere near the operation you need...even to match the original spec of the single throttle you tossed in the garbage. Second, since the 20V's idle is controlled not by the TPS and the throttle body, but rather a secondary port called ISCV which leaks idle air in a controlled manner aft of the fully closed throttles. Since the 16V engines never had this, you have to figure out a way to devise a similar tactics through your own ingenious method. The throttle in any case must be fully closed to get idle mixture control on. The manifold will not bolt on to the 16V's intake so an adapter should be used or fabricated. Overall, not many of the private shops have successfully made such setups perform better than what can easily be done with the single throttle, even though almost all of them have succeeded in getting a car to run decently. That said, there are a handful of shops that did make things work wonderfully (all in Japan that I have seen) with the 20V throttle mechanism and kits are available. Be cautioned that they are NOT cheap and greatly exceeds the cost of swapping the entire 20V instead, because it will require a fully programmable ECU and their research results in the form of software. For many of us, a set of side draft carburetor will be a more effective and much cheaper option than grafting the individual throttles on the 16V.

[PazzaAE86]

Ive done it. It can be done, it isnt worth it unless youre really into your car, or are planning on bigass cams etc.

I LOVE mine.

[Mux213]

I think the whole idea rules, ITBs are so coool.. But reading about it, it just doesn't seem to be worth the bucks.. Would make more sence to just swap the engine out or go carbed or something...

Wasn't Ian running ITBs aswell before he got engine trouble?

[Otaku]

Heres a good guide:
http://www.ae86drivingclub.com.au/forum/...topic=5125

[banpei]

Mux213 Wrote:I think the whole idea rules, ITBs are so coool.. But reading about it, it just doesn't seem to be worth the bucks.. Would make more sence to just swap the engine out or go carbed or something...

Wasn't Ian running ITBs aswell before he got engine trouble?

Yep. And his car did have a 7 ribs bluetop.

[NoHachi]

[Whispering mode]

Sportsbike carbs from the last generation that used them sometimes go for as little as 50E on ebay..you can feed them from the stock rail and if chosen well for the hp range, they will need no jetting etc etc..just need a way to fab a manni and controll timing.

It would not be fuel efficient, but have great response and make good torque though the revband.

[PazzaAE86]

Fabbing a mani for motorbike carbs/throttles is easy. Just get an intake manifold gasket and ask a machine shop to copy it, in say 10-15mm steel, then weld 4 tubes onto it of the correct diameter/shape. Then just attach the throttles with short lengths of silicon hoses and jubilee clips. Thats how they are attached on motorbikes. If you run standalone ECU you wont have problems with the TPS and linkage either.

[NoHachi]

Jup, making it a solution that would save the 4AC -> 4AGE swappers a ton of money on pumps, lines etc etc.