sudden boost loss
sudden boost loss After logging a run I noticed it went from 10 lbs on previous run to 3 lbs. Log shows that after burnout no boost duty cycle. So I just hooked up without boost controller to have it around 9 lbs but only at 3lbs. Have pressure tested intercooler and all hoses and cant find a leak anywhere. Anyone have a suggestion what to look for as I am dumbfounded after putting 10 lb spring in and only making 3 lbs and then going to 17 lb spring and making only 7. Thanks in advance for any info.
Are you using tee bolt clamps on all the hoses-years ago I had one losing boost, one of the hoses was actually pulling off, but would go back in place so it looked normal-I switched to tee bolts and problem solved
What intake manifold are you using? Several years ago I was helping a customer down in Mexico City find his boost leak. It turned out he had internal cracks in his LS6 intake manifold. Bob
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I'd pull it off and check it out. Bob
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9 Second Club
Joined: Nov 2003
Posts: 13,616
Likes: 185
From: Norn Iron
After logging a run I noticed it went from 10 lbs on previous run to 3 lbs. Log shows that after burnout no boost duty cycle. So I just hooked up without boost controller to have it around 9 lbs but only at 3lbs. Have pressure tested intercooler and all hoses and cant find a leak anywhere. Anyone have a suggestion what to look for as I am dumbfounded after putting 10 lb spring in and only making 3 lbs and then going to 17 lb spring and making only 7. Thanks in advance for any info.
Everything was fine until you tampered with the wastegate ?
So clearly the problem lies with work done.
Is the gate sealed when it is at idle etc ?
So history ?
Everything was fine until you tampered with the wastegate ?
everything was fine until after the burnout only change was after datelog to see if boost controller was broke but it checked ok also
So clearly the problem lies with work done
Is the gate sealed when it is at idle etc ?
Everything was fine until you tampered with the wastegate ?
everything was fine until after the burnout only change was after datelog to see if boost controller was broke but it checked ok also
So clearly the problem lies with work done
Is the gate sealed when it is at idle etc ?
9 Second Club
Joined: Nov 2003
Posts: 13,616
Likes: 185
From: Norn Iron
if the valve is sealing correctly on the gate and you are not making boost, then you have major issues elsewhere.
But seeing as you say this "problem" only happened after you tampered with the gates...it would seem likely you have created a problem with the gates.
The most likely of which given slow spool and low boost symptoms are that the gate valve cannot be sealing correctly.
Does the gate discharge into the exhaust again or to atmosphere ?
And again history. Has this setup ever ran correctly ? How long for ?
Are you saying the problem occurred whilst racing but making n changes to the setup, or only after you changed the spring in the gate ?
But seeing as you say this "problem" only happened after you tampered with the gates...it would seem likely you have created a problem with the gates.
The most likely of which given slow spool and low boost symptoms are that the gate valve cannot be sealing correctly.
Does the gate discharge into the exhaust again or to atmosphere ?
And again history. Has this setup ever ran correctly ? How long for ?
Are you saying the problem occurred whilst racing but making n changes to the setup, or only after you changed the spring in the gate ?