Turbo Cam ???
Thread Starter
Joined: Oct 2003
Posts: 1,313
Likes: 10
From: Las Vegas NV
Turbo Cam ??? Hello guys i changed the direction of my project and i going single turbo. I like to build a fun car for the weekends that not cost me an arm or a leg!
This is my first v8 turbo. The set up is Lq9 364 with forged Mahle flat top std bore pistons,6.125 eagle h beam rods,ls9 heads gaskets,arp fasteners,truck manifolds turbo set up with on3 76mm 1.00 ar,317 heads with 2.08/1.57 valves,weiand ported and 85mm tb,th 400 trans, and 3.55 gears in a 8.8 rear.
Now one of my quetions is what cam you think is good for my set up?
Any opinion you can give on my plans are welcome. Thanks
This is my first v8 turbo. The set up is Lq9 364 with forged Mahle flat top std bore pistons,6.125 eagle h beam rods,ls9 heads gaskets,arp fasteners,truck manifolds turbo set up with on3 76mm 1.00 ar,317 heads with 2.08/1.57 valves,weiand ported and 85mm tb,th 400 trans, and 3.55 gears in a 8.8 rear.
Now one of my quetions is what cam you think is good for my set up?
Any opinion you can give on my plans are welcome. Thanks
Almost any small cam will work well and provide a smooth idle. Ive used TU0 and TR220 and like both. Others have had good luck with GT2-3. Anything that will raise rpm a little over the stock cam is good.
TECH Fanatic
Joined: Sep 2010
Posts: 1,037
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That would be a pretty good choice. Its got good lift. Its got a longer exhaust duration to help get all the gases out. The LSA is pretty good might even consider a little wider. Turbos don't live valve overlap, due to the fact that the turbo adds back pressure and could cause the intake charge to be forced out and spin the turbo backwards with both valves opened at the same time.
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Verdad Gallardo TECH Fanatic
Joined: Sep 2010
Posts: 1,037
Likes: 2
If you have pressure built up on one side of the turbo it could cause the compressor to surge.
So if you have your intake and exhaust valve open at the same time the back pressure created from the turbo (exhaust gases hitting the turbo and trying to spool it) can overcome the intake pressure and push the intake pressure back through the intake and cause the turbo to surge and try to spin it the opposite way.
Also can happen with a malfunctioning Blow Off Valve because it won't release the pressure and it has no where to go but back into the turbo.
Another problem in high boost applications is if you have the intake and exhaust valves open at the same time, the high pressure intake can over power the exhaust back pressure and force the intake charge straight through the cylinder causing you to lose the boost you built.
So if you have your intake and exhaust valve open at the same time the back pressure created from the turbo (exhaust gases hitting the turbo and trying to spool it) can overcome the intake pressure and push the intake pressure back through the intake and cause the turbo to surge and try to spin it the opposite way.
Also can happen with a malfunctioning Blow Off Valve because it won't release the pressure and it has no where to go but back into the turbo.
Another problem in high boost applications is if you have the intake and exhaust valves open at the same time, the high pressure intake can over power the exhaust back pressure and force the intake charge straight through the cylinder causing you to lose the boost you built.
If you have pressure built up on one side of the turbo it could cause the compressor to surge.
So if you have your intake and exhaust valve open at the same time the back pressure created from the turbo (exhaust gases hitting the turbo and trying to spool it) can overcome the intake pressure and push the intake pressure back through the intake and cause the turbo to surge and try to spin it the opposite way.
Also can happen with a malfunctioning Blow Off Valve because it won't release the pressure and it has no where to go but back into the turbo.
Another problem in high boost applications is if you have the intake and exhaust valves open at the same time, the high pressure intake can over power the exhaust back pressure and force the intake charge straight through the cylinder causing you to lose the boost you built.
So if you have your intake and exhaust valve open at the same time the back pressure created from the turbo (exhaust gases hitting the turbo and trying to spool it) can overcome the intake pressure and push the intake pressure back through the intake and cause the turbo to surge and try to spin it the opposite way.
Also can happen with a malfunctioning Blow Off Valve because it won't release the pressure and it has no where to go but back into the turbo.
Another problem in high boost applications is if you have the intake and exhaust valves open at the same time, the high pressure intake can over power the exhaust back pressure and force the intake charge straight through the cylinder causing you to lose the boost you built.
Everyone will tell you to get this cam becsuse they have it so you should. Everyone has an opinion and EVERYONE is always right... Best advice I have is if it's a budget choice you looking for get an 02+ ls6 cam if not call some of the big name shops (I got Shawn at VAspeed to spec me one) but in the end just get someone that does this for a living to spec YOU a cam for YOUR exact setup...
Thread Starter
Joined: Oct 2003
Posts: 1,313
Likes: 10
From: Las Vegas NV
FormerVendor
Joined: Dec 2001
Posts: 2,444
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From: WWW.SPEEDINC.COM
To the OP. In my opinion, your money would be better off spent on upgrading to a better turbo. You will make much more power with a good turbo and a stock cam than a bigger cam and your current turbo.
TECH Fanatic
Joined: Sep 2010
Posts: 1,037
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http://www.google.com/url?sa=t&rct=j...RInX_g&cad=rja
Give her a read. A turbo improperly chosen for your setup will cause back pressure on the exhaust and reversion when happen.
Give her a read. A turbo improperly chosen for your setup will cause back pressure on the exhaust and reversion when happen.