The impulse fueling is a standalone ecu running parallel with the stock ecu. In other words we don't use or manipulate any of the stock electrical components or stock fuel. The only stock input we read is the tps. Impulse inputs to the impulse ecu are: map, baro, tps, coolant temp, air temp, wideband . 6 inputs to the ecu... More inputs to the ecu=more refined crisp tune. And it takes all these inputs to be able to auto correct itself . I can't remember the last time we had any of our sensors fail (with the exception of the wideband sensor so we always carry a spare). However if a senor does fail the impulse ecu has led lights that pinpoint what sensor is the culprit. And if a senor does fail the ecu goes into a safety map so you can ride the rest of the day safely without that sensor.
We dump the wastegate to the atmosphere because that's what is designed to do. By plumbing it back into the exhaust your defeating the whole purpose of a external wastegate which is -reduce back pressure. We run tial turbine housings and tial external wastegates for this reason. Plumbing the wastegate dump increases turbulence in the final exhaust which increases back pressure which is inefficient. Every thing we design is for optimal efficiency. Which leads me to oiling the turbo...
There are some using the injection pump for oiling the turbo. We aren't going that route because #1 our turbo oiling works and we've never lost a turbo because of oiling. #2 Garrett turbos were designed to be fed a small amount of oil fir optimal throttle response. If you feed the turbo oil from the injection pump you have to dead end the turbo oil return. By doing this you will eventually fill the entire center section with oil which again will increase drag on the turbo and decrease throttle response. There is a reason garrett puts on oil resrictors and only requires a small amount of oil. Again, we could save money and time doing it the other way but we won't sacrifice performance to save a few bucks.
Intercooler...As I mentioned before we have a air intake sensor with our ecu. When paul tunes he monitors this sensor. The highest we've seen the intake temps at 10 psi are 110 degrees. That's really good. Now, this was with the skidoo kit but we're expecting similar with the Polaris. If someone wants to run 15 psi or higher then yes you probably need a intercooler.
Good questions, hope this helps.
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