7-6-7 Boost Pattern

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12-09-2003, 10:48 AM

jonrx7uk

Junior Member

Thread Starter

Join Date: Nov 2003

Posts: 5

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…

12-09-2003, 05:53 PM

9BASE3

Senior Member

Join Date: Feb 2002

Location: Frederick MD

Posts: 6,331

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

12-11-2003, 05:21 AM

jonrx7uk

Junior Member

Thread Starter

Join Date: Nov 2003

Posts: 5

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.....