7-6-7 Boost Pattern, Blocked CAT?
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7-6-7 Boost Pattern, Blocked CAT?
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…
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…
#5
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Re: 7-6-7 Boost Pattern, Blocked CAT?
Originally posted by jonrx7uk
At 6500 – 7000 rpm it dies (i.e. acceleration / boost stops)
At 6500 – 7000 rpm it dies (i.e. acceleration / boost stops)
This thread was my experience with a clogged cat. I figured it out toward end of the thread. Ignore the unproductive posts from one of my "haters"...
https://www.rx7club.com/showthread.p...&highlight=404
When you figure out your problem PLEASE follow up on your thread, so you can contribute to the community's knowledge on FD3S sequential turbo problems.
Last edited by SleepR1; 12-09-03 at 08:21 PM.
#6
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Re: 7-6-7 Boost Pattern, Blocked CAT?
Originally posted by jonrx7uk
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?
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?
As others have said, check the wastegate inline restrictor. It sounds like everything is working except boost control.
-pete
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Did you remove your pills when changing out your vacuum lines? This will give you 7lbs of boost.
The hoses have been changed at some time (in Japan). I pulled one off last night (turbo precontrol) to see if i could see a pill, there apeared to be nothing in the hose at all
What does a pill look like?
Why would this only give me 7psi instead of 10psi?
Does this explain the car dying at 7k?
Thanks for all the help
When you figure out your problem PLEASE follow up on your thread, so you can contribute to the community's knowledge on FD3S sequential turbo problems.[/
One of my pet hates on previous forums....
The hoses have been changed at some time (in Japan). I pulled one off last night (turbo precontrol) to see if i could see a pill, there apeared to be nothing in the hose at all
What does a pill look like?
Why would this only give me 7psi instead of 10psi?
Does this explain the car dying at 7k?
Thanks for all the help
When you figure out your problem PLEASE follow up on your thread, so you can contribute to the community's knowledge on FD3S sequential turbo problems.[/
One of my pet hates on previous forums....
Last edited by jonrx7uk; 12-10-03 at 03:26 AM.
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#8
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They look like "Pills" with a small hole in the center. The pill should be in the boost and prespool hoses. Make sure you are pulling the correct hoses. If the pills are removed, you will get exactly 7lbs of boost on both turbos. You can also tell if you blow through the hose. There is a lot of restricition with the pills in.
Let me know what you find.
Let me know what you find.
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Checked the pills last night, what pills? The hoses were completely empty!!! That would explain the 7psi. Manufactured some pills myself (with a 2mm hole drilled through (0.079" for you foreigners!)) to see if it made a difference, got more boost
Now it's time to source the correct size pills from somewhere here in the UK...
Looks like i have got to the end of my low boost problem...
Thanks to everyone who gave help
Now it's time to source the correct size pills from somewhere here in the UK...
Looks like i have got to the end of my low boost problem...
Thanks to everyone who gave help
Last edited by jonrx7uk; 12-11-03 at 05:00 AM.
#12
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You might check Summit Racing (not sure if they'll ship to you or not):
http://www.summitracing.com/
There's some more info in this thread:
https://www.rx7club.com/showthread.p...hreadid=226647
http://www.summitracing.com/
There's some more info in this thread:
https://www.rx7club.com/showthread.p...hreadid=226647
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