mrx

Hi,

when using a EBC with one solenoid you can either connect it in-line with the boost source to the side-port of an external Wastegate (similar to a manual boost controller or a EBC connected to an internal-wastegate)

or

connect the side-port permanently to a boost source and connect the top port in-line with the same boost source from the side port.

Both connections will work, but why do external wastegate or ebc manufacturers recommend to use the top port for EBC wastegate control?!?
can someone explain where the physical difference is and what are the advantages and disadvantages of the two solutions?

both of them work, i've tested them both, but didn't found any difference in boost controll (at least at normal boost levels)

Best regards

boostedcivicsir

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mrx &raquo;</TD></TR><TR><TD CLASS="quote">Hi,

when using a EBC with one solenoid you can either connect it in-line with the boost source to the side-port of an external Wastegate (similar to a manual boost controller or a EBC connected to an internal-wastegate)

or

connect the side-port permanently to a boost source and connect the top port in-line with the same boost source from the side port.

Both connections will work, but why do external wastegate or ebc manufacturers recommend to use the top port for EBC wastegate control?!?
can someone explain where the physical difference is and what are the advantages and disadvantages of the two solutions?

both of them work, i've tested them both, but didn't found any difference in boost controll (at least at normal boost levels)

Best regards</TD></TR></TABLE>

they regulate boost by how hard they hold the valve shut through pressure on the top port.

mrx

i know how it works, but i see no physical reason why it is better to use the top port instead of the side port like when you are using a manual boost controller.

Top Port: if boost is applied, the same force is supporing the spring against the boost pressure from the side port.

Side Port: because of the duty-cycle of the solenoid a mean pressure lower then the boost pressure (depending on boost pressure) is pressing against the spring, so raise boost level...

so both connection types are doing the same, but i'am sure that there is a reason (maybe better control) via the top port... so i hope someone can explain why.

dpetro1

side port applies pressure under the diapragm, top port applies pressure above the diapragm. wastegates are opened by pushing up on the spring from the bottom. the EBC allows for pressure to be applied up top acting against the upward push of the bottom port. this helps to increase spool and give better boost control.

mrx

Yes, but lowering the amount of boost on the side port does physicaly the same...

This is not a discussion/question about the general principle of EBC and a external wastegate... it's about the physical difference a side vs. top controlled boost controll.


is top control gives a better boost controll, maybe you can physicaly explain why?

Thanks

dpetro1

well im not an expert but my rational is that using only one side of the diapragm must be less effecient. an MBC just blocks, or bleeds boost from the side port. using the top port allows pressure to be equal on both sides rather than just reducing it, thus giving more control. i dunno it makes sense in my head, hopefully im making sense to you guys as well.