I posted this at CMC and turbomustangs.com as well.
Probably not a lot of turbo guys over here but ill throw this our there in case someone has come across something similar and knows the problem.
When I spool up the turbos in first Im OK. I shift second and am OK for the most part. When I shift third and start to spool them up, it boosts and as it increases its starts with this god awful noise that sounds like someone beating the piss out of the K member under the car. At first I thought it was the pipes tapping the K. I wrapped the K and slid some header wrap in between the piping and K on the drivers side. It was still doing it. Several guys on the Mustang boards were telling me its spun bearings, its a thrown rod or a rod knocking. Hell I know exactly what these sound like and for starters it only does it high second or third and up in heavy boost. It isnt coming from the engine at all. At first I thought it was detonation, Its not detonation.
OK I drove down to Janesville and met up with Vann (Mustangone) and a few other guys. I wanted some others to hear and feel this first hand.
I knew it wasnt going to be bearings or rods. I took these guys out and spooled the turbos up in the same manner as I previously stated. I also let Vann drive it.
It isnt coming from the engine at all. This is something to do with the pressure at the wastegates or in the exhaust. There is either an exhaust leak before or after the turbos.
We were tooling around with this idea.
Ive got 2 chambered flowmasters on here and that wonderful crappy HP Perf H pipe.
What if the exhaust is bottlenecking and there isnt enough flow so its throwing the exhaust back at the turbos or wastegates or is trying to force its way out of a small but noticeable leak. A couple of the guys standing outside the car said it sounds like the wastegates
I know your not supposed to run chambered mufflers on turbo cars
Im going to cut the catback off and see if that clears it.
HP Perf has just started fabbing X pipes for these turbo kits and have put me on the list to get one in 2 weeks free of charge.... among some other things.
Anyone???
Im just wanting to make sure this isnt something that will interfere with Kurgans tuning of this thing once it gets on the rack.
Probably not a lot of turbo guys over here but ill throw this our there in case someone has come across something similar and knows the problem.
When I spool up the turbos in first Im OK. I shift second and am OK for the most part. When I shift third and start to spool them up, it boosts and as it increases its starts with this god awful noise that sounds like someone beating the piss out of the K member under the car. At first I thought it was the pipes tapping the K. I wrapped the K and slid some header wrap in between the piping and K on the drivers side. It was still doing it. Several guys on the Mustang boards were telling me its spun bearings, its a thrown rod or a rod knocking. Hell I know exactly what these sound like and for starters it only does it high second or third and up in heavy boost. It isnt coming from the engine at all. At first I thought it was detonation, Its not detonation.
OK I drove down to Janesville and met up with Vann (Mustangone) and a few other guys. I wanted some others to hear and feel this first hand.
I knew it wasnt going to be bearings or rods. I took these guys out and spooled the turbos up in the same manner as I previously stated. I also let Vann drive it.
It isnt coming from the engine at all. This is something to do with the pressure at the wastegates or in the exhaust. There is either an exhaust leak before or after the turbos.
We were tooling around with this idea.
Ive got 2 chambered flowmasters on here and that wonderful crappy HP Perf H pipe.
What if the exhaust is bottlenecking and there isnt enough flow so its throwing the exhaust back at the turbos or wastegates or is trying to force its way out of a small but noticeable leak. A couple of the guys standing outside the car said it sounds like the wastegates
I know your not supposed to run chambered mufflers on turbo cars
Im going to cut the catback off and see if that clears it.
HP Perf has just started fabbing X pipes for these turbo kits and have put me on the list to get one in 2 weeks free of charge.... among some other things.
Anyone???
Im just wanting to make sure this isnt something that will interfere with Kurgans tuning of this thing once it gets on the rack.