loomiscolonius

Gents,

This topic probably is a subtopic of the proper turbo mapping started earlier. I keep getting boost delays when I'm running the car. (Stock turbos - Just put a new motor in back in May)



I don't have a boost gauge to tell what is happening, but I should get boost at 3000rpm up to 5, where the transitions occurs. The boost is sporadic and I know it's not configured like it was before the new motor.



Does anyone know what's happening?

Fd3BOOST

Yea you need a boost guage.

Did you put back on the stock vacum hoses?

Sounds like you might be leaking but unless you have a boost guage you wont know for sure.



btw

The flapper door opens at 4500 rpm for transition.

j9fd3s

it could be a failing check valve, or maybe a misrouted hose?



mike

Fd3BOOST

Well I agree it could be lots of things, Could be the precontrol door sticking or maybe a bad solinoid but until you get a boost guage youre just guessing.

Thats where you need to start.

loomiscolonius

Your right, I do need a boost gauge....



My mechanic changed these sensors that apparently went bad. It seemed to have decreased the problem. Yet, I still feel my mapping isn't set right. What controls the turbo boost/mapping etc??

Fd3BOOST

The ecu.. controls mapping and boost.

If you dont hae an after market adjustable ecu such as an Apexi power FC or a PFS PMS then you cant change your maps.

loomiscolonius

Thank you so much, I appreciate your help.

Fd3BOOST

Check the for sale sections here and at www.rx7club.com You can usually find a good deal on a PMS for around $500.

Alot of guys like the newer PFC, but I run the PMS and I like it. It is easy to use and gets the job done.

grngtcfd3s

the same thing is happening to me... but only in 3rd gear. it sounds like i have a leak.. but only in 3rd, any ideas???

Fd3BOOST

Maybe a sticky actuator?

Check the actuator on the precontrol and on the wastegate just to make sure the rods are moving.