It's better for the throttle body to be without the VE cold start and fast idle valve if you hope to have a good cold idling and running engine. Most of the complaints are from people who are running with the VE cold start valve and not the people running the stock B13 or B14 throttle body. Here's why.
Most are running DE ecu with the VE, and the DE bins don't have the VE warmup strategy and programming to get a good cold running and idle. The fuel and timing is not optimum for the VE TB. The DE based bins have a target idle speed at different engine temperatures. It's usually at 1500rpm below 68*F. The problem is, if you are running the VE TB, the added throttle opening by the cold start/fast idle valve, when the engine is cold, causes the idle to be more than 1500 rpm. The ecu will try to correct this and to get the engine to idle at 1500, it will retard the timing. We all know how crappy the engine drives with retarded timing.
This problem will magnify if the TB is bigger. The bigger TB will have a bigger throttle opening per throttle angle. The cold idle speed will be higher and so the ecu has to compensate even more by trying to retard the timing. For the people runing the VE TB, you can see this by disconnecting the tps sensor and starting the engine when it's cold. You will see how high it idles without the help of the ecu idle stability program. Once you unplug the tps, the ecu won't try to retard the timing.
Originally Posted by Teal97 
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