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Old 03-07-2014, 09:38 AM   #1
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cams with a turbo. NEED ADVICE.

I am currently having my engine fully built into a forged (manley) 5.0 stroker. I plan on throwing my turbo back on the car and pushing about 15-16 lbs of boost to mske about 600 at the tires. I've always wanted that old school muscle car thump to the car (currently run borla stingers and offroad pipe) but never knew my options with a turbo. I know there are turbo cams but apparently they just gain hp and dont have that heavy lope to them. Can I add cams like Detroit rockers and frpp hot rod cams to a turbo set up? How will it act? Will it be a rough ride? Any and all experience and opinions/knowledge would be appreciated!
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Old 03-07-2014, 09:59 AM   #2
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Turbo/supercharger power doesn't work well with big thumping cams.

Basically, a turbo runs off of exhaust gas. A big thumping cam has more overlap of both intake and exhaust valves being open. In a forced induction application (turbo moreso than supercharging) that overlap creates crazy amounts of pressure on the exhaust valves that just isn't there in a NA build and causes blowback.

Basically in a forced induction car, you want high lift and short duration. That is why cams in the 114 - 115+ LSA range are preferred for boost whereas an NA will have an LSA of 110 - 113 (this creates the thumping or cammed noise).
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Old 03-07-2014, 10:18 AM   #3
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Quote:
Originally Posted by Ish416 View Post
Turbo/supercharger power doesn't work well with big thumping cams.

Basically, a turbo runs off of exhaust gas. A big thumping cam has more overlap of both intake and exhaust valves being open. In a forced induction application (turbo moreso than supercharging) that overlap creates crazy amounts of pressure on the exhaust valves that just isn't there in a NA build and causes blowback.

Basically in a forced induction car, you want high lift and short duration. That is why cams in the 114 - 115+ LSA range are preferred for boost whereas an NA will have an LSA of 110 - 113 (this creates the thumping or cammed noise).
Is there no way of getting the lope that I desire while using a turbo? Or when you say it doesnt work well together, does it mean that it won't build boost as well? And lsh are you the guy on IG with the TT termi?
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Old 03-07-2014, 11:02 AM   #4
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I don't own a Terminator. The cars I have are listed in my sig.

With a big lopey cam, the car just will not run correctly as there will be too much pressure for the exhaust valves to deal with, thus creating the blow by.

You can still get a turbo cam that will have a lope to it, just nothing like an NA car will have. Think of how the stock car sounds with slightly more lope from a turbo cam.

Also, a turbo acts as a muffler so the car will be much quieter than it would NA. Opening up the exhaust will likely fix that.
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Old 03-07-2014, 11:17 AM   #5
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I don't own a Terminator. The cars I have are listed in my sig.

With a big lopey cam, the car just will not run correctly as there will be too much pressure for the exhaust valves to deal with, thus creating the blow by.

You can still get a turbo cam that will have a lope to it, just nothing like an NA car will have. Think of how the stock car sounds with slightly more lope from a turbo cam.

Also, a turbo acts as a muffler so the car will be much quieter than it would NA. Opening up the exhaust will likely fix that.
Exhaust is already fairly open (no cats and hot stingers off a y pipe) and for the little lope youll get, the vet minimal lope, its not worth $1000.
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