RX7Club.com - Mazda RX7 Forum - Boost dies :( pedal to the floor, boost goes to zero after 5000rpmish

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Boost dies :( pedal to the floor, boost goes to zero after 5000rpmish

Anyone know why my boost cuts? its a JDM TII S5, T04E, FMIC, 0.5bar. FCD. tuned ECU.

full throttle...an the boost just drops to zero and huge lose in power.

Searched without success. :(

Not much info to go on, mate. Does it build boost on part throttle after 5Krpm ? what about on part throttle ? You might wanna check the piping for leaks first. After that would be vacuum lines.

I would check and see if the fins are hitting the housing itself. There is a possiblity that your turbo is not balanced. Does your exhaust smoke allot when driving?

Quote:

Originally Posted by myfc3s (Post 7329086)

I would check and see if the fins are hitting the housing itself. There is a possiblity that your turbo is not balanced. Does your exhaust smoke allot when driving?

No smoke, I'll check for play, but i doubt it.

Quote:

Originally Posted by SomeGuy_sg (Post 7329056)

Not much info to go on, mate. Does it build boost on part throttle after 5Krpm ? what about on part throttle ? You might wanna check the piping for leaks first. After that would be vacuum lines.

once the boost dies, i can let off and build it again. I can part throttle it all the way to red line. I'll cheak for leaks? wouldn't I have idling problems?

Check all your IC piping, maybe it's possible that at those RPM's you've got a seal that gets loose.