T&B rotary

Ok I recently bought my first fc its turbo and is got 35k with new turbo but im now having boosting problems the car acts like its not even boosting no power and boost gauge reading very low plz help idk were to start!

13b>2jz

Happens a lot friend. First check you exuast manifold boost is very hot and likes to crack them.
2nd try checking the spring that controls your boost maybe it's broke I e seen it happen alot.
3rd I love fcs but like all rx7's are getting old check all your pipping leaks are very common especially if your still running black rubber hoses. Hope this helps a little

T&B rotary

Spring..?where can I find it??

satch

iTrader: (1)

Does the Boost gauge work at all?

wyerrick

if the wastegate spring was broken, it would be overboosting.

BomberMan

iTrader: (4)

What year? How much psi of boost? Even with a cracked mani you should get decent boost. I'd check to either see if you have a boost leak, or if power is down due to the car operating in "limp mode" (read: check for a trouble code)

Oh and the wastegate spring is located in the actuator so if it brakes the wastegate will open with exaust gas pressure alone. These rarely fail however. Depending on the model year if you are getting 4+ psi of boost your wastegate is is fine.

T&B rotary

Its an 88 vert with 89 13bt. And the boost guage barley come up off of -20 when I floor it! At idle... going to see wat I can find out about this "limp mode", might be the problem..?!

satch

iTrader: (1)

If you have an S5 ECU and OMP then you can be having problems w/limp mode otherwise S4 ECU's don't suffer from this problem.

T&B rotary

Ecu n333..

T&B rotary

Its got great acceleration but lacks power boost stays on -20 at idle. Is Tht normal?!?

BomberMan

iTrader: (4)

I don't know what sort of boost gauge you are using, but a vacuum reading of 20 In/M at idle is normal.

If you stomp your foot to the floor it should begin to spool and quickly go to 0, that's atmospheric, even an NA will do this (sort of). After that boost should build rapidly and the car will make pressure above atmospheric. Only a few retardedly big turbodiesels will make boost at idle.

satch

iTrader: (1)

Did the car ever boost properly or not? If it has worked previously but is now on the fritz then disconnect the vacuum hose to the boost sensor and w/key to on measure the voltage on the Brown/Red wire at the sensor plug. It should read from 2.3 to 2.7 volts.

T&B rotary

Alright. I changed ecu and cleaned my injectors now it running normal except for after it warms up and im guessing guts a leak in stock piping.thank y'all for the help and for all the quick replys.now its time to go ride!!

T&B rotary

ok its been awhile but the prolem was the cat was melted and it was corked!! a few minutes with some rebar and its haulin ***! boost creep with new 720s all around... but thts another project!!!

Badfastbusa

Great to hear you got it rocking again, restrictions like that can be hard to pinpoint with so many things going on with these motors.

TheZkidd86

Do a boost leak test