Hey, what would an (almost) complete blackage in one of the nipples of the turbo precontrol solenoid do? from memory it was the lower inlet... i'd almost covered the hole with a (in hindsight) crap nipple repair job.

thank god i'm not a plastic surgeon huh?!

 

Uhh...Why dont you just PM fritzflynn and get a replacement solenoid for $10.00?

 

basically because i am in New Zealand, so thats $10 for the solenoid and $3,000 for shipping!

lol, how much are these from Mazda? i'm not sure they are my problem yet but at the right price i may as well replace 'em!

 

You would most likely get low transition if the blockage were serious enough. Something like a 10-5-10 boost pattern.

New solenoids (these come as a pair with the wastegate solenoid) are about $130 in the US.

 

I think you'd have a higher transition and maybe a reduced primary from 3500-4500. The restriction would reduce the venting of air from the precontrol actuator, which means it would hold a higher net pressure and keep the precontrol open a little more. More precontrol opening would get the secondary spinning more/faster, but might siphon off enough flow to reduce the primary.

Dave

 

i'm not so sure, my understanding is that the turbo precontrol handles boost pressure regulation up until the transition... a full blockage (if that is the case) would reduce air bleed and limit me to 7psi of boost right?

thus, could be the cause of my whole flat boost issue as it would not generate enough pressure to utilise the second turbo.

full text from where i got my info (from the FAQ links) is below.





0 to 3,000 RPM
In this RPM range, boost is produced by the Primary Turbocharger only. At this time, most of the the exhaust is directed to the Primary Turbo by the Turbo Control, and the Secondary Compressor is isolated from the Primary by the Charge Control. Boost pressure is mostly regulated by the Turbo Pre-Control.

3,000 to 4,500 RPM
In this RPM range the Turbo Pre-Control valve is almost fully opened and preliminary rotation of the Secondary Turbo has begun, any boost pressure from the Secondary Turbo is vented via the Charge Releif Valve to the air cleaner. Boost pressure is regulated by the Turbo Pre-Control and the Wastegate Control.

At 4,500 RPM
At this time, the Secondary Turbo is at full preliminary rotation speed, the Turbo Control is opening, Charge Releif closes causing the Secondary Turbo to surge for a short time. The Charge Control then allows Secondary boost to be added to the Primary boost.

4,500 to Redline
The Turbo Control is fully opened, and boost pressure is created by the Primary and Secondary Turbochargers. When both Turbochargers are actuated, boost prerssure regulation is preformed by the Wastegate Control.

 

So what is your boost pattern?

 

7psi - flat... feels like no secondary even being considered.
pills are in, hoses are right, actuators are moving... i definitely think it is between those two solenoids so i took them out the other night and noticed the blockage... have repaired and am hoping.