I've got questions about running ITB's. I'm aware you need to run a stand alone ecu if you go with the ITB's. The stand alone I'd probably use would be the AEM EMS.

I know people tune their setup based off of the TPS, but can you tune using TPS and MAP? If so, where would you install the MAP sensor so it gets an accurate reading? I'm guessing you have to have a box over the ITB's and mount the MAP on the air box.

Is AEM EMS even capable of reading from the MAP?

My other question is how much of a difference is there from the ITB setup VS the regular Manifold/TB setup? I'm guessing you have much nicer throttle response from the ITB setup, but what kinda power do you achieve with just the ITB's and running stock cams?



Bumnah

 

ITB's are a tuning nightmare. I don't know that many if anyone has gotten to a point where they were completely happy with the ITB tune. Do an exhaustive search on the topic and you will find most of your answers in older threads. It's an extremely high maintainence mod.

 

Tuning ITB does not have to be nightmare if you know what you are doing. My daily-driven ITB'ed miata has proved many people wrong: it's smooth, torquey, made +50% rwhp (mostly from supporting mods), made good fuel mileage, passed emission test every year, and was not high maintenance once developed.

https://www.s2ki.com/forums/index.php?showt...dpost&p=5553658

Bottom line is don't try to think running TPS-only to avoid tuning problems. You may get it tuned in the ballpark sooner with TPS only but you'll end up very difficult to fine-tune it because in every different running environment, your TPS tuning will be off. The problem is that TPS doesn't measure air-flow but "assumes" it. Try every possible attempt to use TPS plus MAP sensor. I don't know about the AEM, but TPS-blend helps fine-tuning a lot. Even then, use as much MAP sensor reading as possible.

The key to running MAP sensor on ITB is to build some kind of vacuum tank to store and smooth out vacuum pulses from each runner. The size and even shape makes a huge difference in the outcome. Too big a tank you loose throttle response. Too small a tank you get pulsive MAP sensor reading and may require too much TPS-blend to hide the problem. I'm relatively new to the S world and know that the S runs a vacuum tank from the factory. I don't know if it can be used for the ITB.

The best and perhaps the easiest way is to fabricate your own vacumm tank with some brass pipes. Get a brass pipe (1/4" diameter IIRC, at least 2ft long), a fitting brass end-cap, and a hose barb fitting the pipe (for brake booster) from Home Depot. Get a small brass pipe from hobby store (diameter big enough for small vacuum hose, long enough to make 5 or more barbs). Cut the big brass pipe into length (about 18", require tuning), drill 4 holes equally spaced out and solder in 4 small brass pipes for the 4 vacuum hoses to the runners. Use pipe solder or even regular solder. Drill one hole and solder in a small brass pipe for the MAP sensor (and more holes if more vacuum devices). Solder in end cap on one end and the other with the big barb for vacuum booster. This may sound quite a bit of work but trust me a well-tuned vacuum tank saves you a big deal of headache by not needing to run more (or all) TPS to avoid MAP sensor reading problems.

 

The AEM EMS is not really good to run a blended setup (unlike say the Electromotive systems where the capability is built in). The best option is to run TPS with a barometric correction for varying ambient pressures.

Alternatively, you can try and run map only, but you need to scale the load breakpoints very tightly between 2" and 0" of vacuum (at least half the loadpoints).

UL

 

How is this so? If the AEM EMS 30-1052 is plug and play for a stock S2000, it should already be able to read both TPS and MAP in a