i have an amal valve on my mfi turbo which has an insert in one of the ports about 2mm id. i have a inline switch operating amal and setup the -31 actuator to about 12psi when the amal isnt active. trouble is, with the amal in use i see 20psi wheras im sure it used to see 15psi. only thing changed is the ecu now has a sitech chip. could a chip alone alter the boost level for a given setup or could i have developed an air leak around the amal plumbing? failing that, assuming everything else is in order can i lower the boost via the amal using a different jet/insert? my jet is in the c port. would enlarging slighty drop the boost or increase it? sorry for the essay, im a bit baffled as to how the jets work relative to what port there in? many thanks

 

can anyone help, particularly in how the inserts work. ie smaller hole = less boost or more boost.

 

Fit the std 2.5mm restrictor in the R port in addition to the one in the C port. That will drop your boost from 20psi to about 16psi. Adjust on actuator if you want any less than 16psi on high boost.

 

thanks karl. i only have 1 restricter fitted, time to hunt for another. any idea's were i can find the jets or is it time to get some nylon/get my dads lathe warmed up? thanks mate. was wanting no more than 15/16psi so that pointer sounds promising.

 

Personally, I'd let a pro set it up mate.

 

whats the spec of the chip and whats the spec of the engine?

surely you want the correct spec chip for your engine.

defo get it checked over by a pro once you're done tho

 

chip is a sitec. engine is standard with usual exhaust/cone filter.
right i have fashioned an insert and with amal off, got the usual 12psi. with it active i have brought it down to about 14psi. now time for a setup. will have some nylon or alloy inserts machined up and have a more long term jet solution as per std fitting inserts. thanks fellas.