7-6-7 Boost Pattern.



After a few weeks of changing vacuum hoses, renewing gaskets and tightening/replacing hoses etc I now have a 7-6-7 Boost Pattern (better than my previous 7-5-2!). The car performs exceptionally well now J.



At 6500 – 7000 rpm it dies (i.e. acceleration / boost stops).

From what I understand boost is supposed to hold while redline?

Is this a classic case of a blocked main cat?

Would a blocked main cat explain the lower boost reading?

Could the new boost gauge be faulty as I understand I need 8psi to operate the 2nd turbo, but it is definitely coming in and holding 7psi…



The car has twin K&N Cone filters and a replaced downpipe (’92 Jap import ‘R’ Type)



Any help appreciated…

 

Boost gauge could be off... See if you can find a low mileage cat to swap out and see if that remedies the problem...

 

Turned out to be the pill (or lack of pills)!

The previous owner (in Japan) had changed these 2 hoses and must have not known they had pills in them.

Time to source new pills here in the UK.....