f150rx7

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

f150rx7

sorry for the typo (anybody KNOW exactly)

Mahjik

iTrader: (1)

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

rynberg

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.

f150rx7

just the turbos, sorry i didnt give enough info.

f150rx7

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

Mahjik

iTrader: (1)

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.

f150rx7

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

f150rx7

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.

turBRO [ArTiN]

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

dgeesaman

iTrader: (7)

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

f150rx7

thanks ill look into it