Does anybody exactly when the secodaries initiate? RPM? Is it only by RPM or other parameters? Does it vary also? Thanks guys...

 

sorry for the typo (anybody KNOW exactly)

 

http://www.autosportracetech.com/RX-...erOverview.htm

 

Are you talking about when the secondary turbo comes online or the secondary injectors?

The secondary turbo come online at 4500 rpm if primary boost is 7+ psi. It will come online later in the rpm range at lower boost levels.

The secondary injectors come online when the primaries exceed a certain duty cycle (50% IIRC). There is no bearing as to rpm or boost level.

 

just the turbos, sorry i didnt give enough info.

 

So the ECU has to see 7 psi first to activate the secondaries?

 

The turbos are controlled by the vacuum system (check the link I provided above). There are cases where the secondary does not need 7 PSI to activate. That statement is a little misleading.

 

Oh yeah thanks Rynberg/Mahjik for always answering our questions......correctly

 

Im pretty new to this sequential system since i use to run a single turbo. I know how the basics are but only have little knowledge with what kind of problems you guys have expirienced. Im working on my friends car since his only boosting 7-8 psi and i dont see a 10-8-10 pattern at all, it just peaks at 7-8 and stays. I did my check and found the charge RELIEF valve not venting at all even as i REV the engine from the throttle body, i checked the Charge CONTROL butteryfly and its closed like it's suppose to. I already have my suspicions but i was wondering if you guys encountered this already.

 

3,500-4,500 rpm secondary is spooling up and primary is still runnin (its acually running ALL the time)....... 4,500+ rpm second is fully engaged including the primary

 

Charge relief (prespool) is controlled and varied by the ECU depending on load. I wouldn't be surprised if the ECU doesn't respond normally if you simply fiddle with the throttle cable.

For a car showing 7-8 psi both above and below 4500rpm, start with boost leaks. Then look at the wastegate and precontrol solenoids - ensure they are connected and the electrical connectors aren't swapped.

Dave

 

thanks ill look into it