FP T25/28 17 psi actuator

[Nayr747]

Did a couple quick searches but didn't turn up anything. Just curious about this. http://linux.forcedperformance.net/m...=WAT28DSM17psi

Couple questions: Why would this be any different than using a mbc at 17 psi? Why does it show a pretty large hp increase over an mbc at 17 psi? And isn't 17 psi a little high for the T-too small? At twice as much as a mbc, and less adjustability, I don't see why they are selling this.

[crunchymilk55]

"Run 013 was the stock actuator with the boost turned up to spike to 17psi and drop to around 12psi. Run 023 is the New 17psi actuator running a steady 17ps"

12psi vs 17psi, it's an unfair comparison

They're probably selling it for people who want a stock appearing engine bay,(the people running T28's)

To just about everyone, they see a stock turbo running stock boost, no mbc.

[Nayr747]

Thanks crunchy, that makes more sense.

[crunchymilk55]

no problem

[kjewer1]

The reason to upgrade the actuator is to keep the flapper from blowing open prematurely. The t25/28 has a very resitrictive turbine housing, raising pressure on the manifold side of the flapper, which then pushes it open (force = pressure x area). Another reason is to allow EBCs to run more boost (most do double WG spring pressure), but this is unlikely to be a reason to do this on such small turbos. Also, running more than double spring pressure with an MBC can lead to very unstable boost.

I installed a Forge 17 psi actuator on my EVO8 turbo. No change in the max boost I could run, but it was worth the 150 bucks to rule out a flapper blowing open problem. The EVO8 turbo seems to be designed very well since it doesn't blow the flapper open at up to 28 psi.

[Nayr747]

Ah, I see. Thanks Kevin.