Want to build costom turbo kit. Need advice from boosted guys!

[cali yaris]

1. definitely a couple of gauges will be needed.
2. strongly recommend an extra O2 bung in your downpipe. you'll be glad it's there someday, and it's a pain to take out and add later.
3. re: parmas comment -- you can't have less than the spring pressure, so if the spring is 8psi, that's the minimum you can run. A boost controller is a great idea to prevent the spikes/surges he is warning about.

[Parmas]

Originally Posted by cali yaris

3. re: parmas comment -- you can't have less than the spring pressure, so if the spring is 8psi, that's the minimum you can run. A boost controller is a great idea to prevent the spikes/surges he is warning about.

Normally a boost controller control boost levels and spring pressure. If we consider the AEM TRU boost it has a boost level percentage setting of 10% as minimum and a spring pressure setting of 1 minimum.

This is an example.... On my setup (in which the actuator is set to 9psi) the AEM needs to be set to boost level of 10% and spring pressure setting of 5 to get good response. Since I had mixture problems I decided to use stock plugs and I needed to have the engine running at the lowest boost possible. So I adjusted the spring pressure to 1 and boost became laggy and it need much more revs to produce that 9psi and I worked fine liked that since I was only hitting 4psi during street driving.