I\'ve just fitted a boost gauge to the RX-7 to see if the boost pattern is correct. I\'m getting:
Consistent 12-6?-8 psi
Where should I start investigating? The 8 feels a bit low after getting 12 low in the rev range.
If it\'s anything to do with it, the car has upgraded air filters and intercooler. I had a look at the ECU to see if this was standard. I don\'t know what a standard ECU looks like, but the back plate was sealed with \'PanSpeed\' stickers. (See photos)
If someone has changed the boost levels, where will this have been done?
Cheers!
ECU
Sticker on back
I have exactly the same symptoms on my car. I think I have a standard ECU. I cannot comment on wether yours is modded or not, though.
Our boost pattern is supposed to be: 12 -8 -12. (My car is a 92, so 11 -8 -11 or so for me)
I have replaced all the vacuum hoses, tested all solenoids, removed the Cat, and even replaced the Turbos! Still no improvement.
I have a spare ECU, so I will try that next.
There is also a way of rigging up a non-sequential setup, for diagnostic purposes, so that would be my next step.
Sorry if this isnt helpful, I guess I just wanted to empathise!!
;)
I\'ve been reading a bit more about it in various places - I thought it was meant to be 10-8-10, but according to something I find that was supposedly used by Mazda dealers, it should be:
RPM PSI
3,000 10
4,500 8 as secondary turbo comes on
4,500 + 10 recovers almost immediately from short dip
6,000 + from 10 to about 8 gradually, and holds to redline
These readings indicate normal operation. Readings will vary with altitude and temperature (& intercooler & induction??),
(i.e. lower temperature = higher boost / higher altittude = higher boost).
I downloaded a load of docs which are now sat on my hard drive, so I can\'t remember where this came from.
I also understand different exhausts affect the transition.
I going to get someone to sit in the car and watch the boost gauge to get a more accurate idea about what\'s going on. It might be my readings are within tolerances afterall. I\'m certainly holding 8 to redline as above.
It drives very well as it is, so I might just check it\'s getting enough fuel at 12 psi and leave it as it is.
Almost wish I\'d never fitted the boost gauge. Ignorance is bliss :)