Have you ever watched your actuator while under boost? Use a hero cam or do on a dyno, just to see if your bracketry is not up to the job.
Bill Cardell TurboDog's Dad www.flyinmiata.com www.fmwestfield.com Sales 1-800-359-6957 Tech 970-464-5600 Before you call, check out http://www.flyinmiata.com/FAQ/ -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Rob Ebersol Sent: Tuesday, April 07, 2009 2:01 PM To: [email protected] Cc: Miatapower Miata Power Subject: Re: Unstable internal WG acutators I had a giant one- it started movement at 4psi and was fully open by 14psi on the bench. I was getting a similar spread on the car - preloading the actuator just raised the start and peak boost while only narrowing the rise difference by a small margin. Here's that actuator installed: http://i158.photobucket.com/albums/t86/m2cupcar/current%20FEmx5t/ IMG_4798x.jpg http://i158.photobucket.com/albums/t86/m2cupcar/current%20FEmx5t/ IMG_4799x.jpg Believe me, the spring in that one is strong - I can't pull it out with my hand. I had to use compressed air to preload it. I had a cheap chinese unit prior that actually worked quite well for a stable WG base with a helper spring, but it fell apart. http://i158.photobucket.com/albums/t86/m2cupcar/current%20FEmx5t/ actuator640.jpg I've noticed that forge has an internal actuator that uses an external WG diaphragm and springs - rebuildable and tunable, but at the price of an external gate. On Apr 7, 2009, at 3:52 PM, Jason C wrote: > Can you get a wastegate with a larger can diameter? > > A larger can means the spring is stronger for a given PSI setting, and > fights the wastegate blowing open better. > > And, a wastegate can that goes from cracking open to fully extended > over fewer PSI (e.g. 5-8 psi instead of 5-15 psi), will have more > "feedback gain" and give you a flatter boost curve. > _______________________________________________ Miatapower mailing list [email protected] http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower _______________________________________________ Miatapower mailing list [email protected] http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower
