N/A cam with a turbo?
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N/A cam with a turbo? my original plan was to build a N/A 5.3 for my camaro but now i have bought everything needed for a turbo setup, the cam in it now is a texas speed 228r .600 lift 110lsa how much will this cam affect my performance?
'thanks in advance
'thanks in advance
If it doesn't have very much backpressure at all then an NA cam will do well. But with ~2:1 backpressure (which is typical on a kit that will fit an F-Body or vette) the exhaust gets pushed back into the cylinder (and intake) on the intake stroke with a cam that has a lot of overlap. A typical "turbo cam" will not have overlap.
Having said that, the cam you have has 8 degrees of overlap. Honestly I would let it fly for the initial install and then get some backpressure readings to spec out a good cam for it.
Having said that, the cam you have has 8 degrees of overlap. Honestly I would let it fly for the initial install and then get some backpressure readings to spec out a good cam for it.
Coming from someone who has done exactly this with my 228r @112lsa...backpressure with a full 3" exhaust is still an issue and holding boost uptop beyond 6k rpm starts to drop. But I make killer torque and less hp. If your shifting around 6200rpm it should do quite well. I love my 228r but now I wanted a suited turbo cam to maximize efficiency.Low boost is fine but trying to ramp it up to 15psi is where backpressure uptop really shows.
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If it doesn't have very much backpressure at all then an NA cam will do well. But with ~2:1 backpressure (which is typical on a kit that will fit an F-Body or vette) the exhaust gets pushed back into the cylinder (and intake) on the intake stroke with a cam that has a lot of overlap. A typical "turbo cam" will not have overlap.
However, experience shows otherwise. There are many engines with high backpressure ratios which will also show impressive improvements to flow with more overlap. Some great examples are the well known sr20/4g63/2jz platforms, which all come in some form or another turbocharged, and all respond well to increased overlap despite high ExGasPress ratios and OEM style manifolds being retained. It might be that the head/ports are more well suited to flow like that (they come turbo, with 4V/cyl head, just a guess) or perhaps its something to do with the whole combination (exhaust gas velocity or port acoustic tuning, another guess) mainly, just be aware that the rule of decreasing overlap for high pressure turbines is not hard or fast.
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I used to think this also. It makes perfect sense.
However, experience shows otherwise. There are many engines with high backpressure ratios which will also show impressive improvements to flow with more overlap. Some great examples are the well known sr20/4g63/2jz platforms, which all come in some form or another turbocharged, and all respond well to increased overlap despite high ExGasPress ratios and OEM style manifolds being retained. It might be that the head/ports are more well suited to flow like that (they come turbo, with 4V/cyl head, just a guess) or perhaps its something to do with the whole combination (exhaust gas velocity or port acoustic tuning, another guess) mainly, just be aware that the rule of decreasing overlap for high pressure turbines is not hard or fast.
However, experience shows otherwise. There are many engines with high backpressure ratios which will also show impressive improvements to flow with more overlap. Some great examples are the well known sr20/4g63/2jz platforms, which all come in some form or another turbocharged, and all respond well to increased overlap despite high ExGasPress ratios and OEM style manifolds being retained. It might be that the head/ports are more well suited to flow like that (they come turbo, with 4V/cyl head, just a guess) or perhaps its something to do with the whole combination (exhaust gas velocity or port acoustic tuning, another guess) mainly, just be aware that the rule of decreasing overlap for high pressure turbines is not hard or fast.