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Cams, the bigger the better?


Defiant
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Galant VR-4 org Post #: 1240243 posted 10/31/17 08:34 AM     Remind Me!  Send Private Message   Edit Post      
I have a question regarding cams.

We all know that bigger cams help rev higher and help up top, but hurt turbo spool.

My question is at what point are the cams over kill?

A lot of people run 272's but are there any benefits over something smaller, lets say 242's?



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Galant VR-4 org Post #: 1240276 posted 11/01/17 01:27 PM     Remind Me!  Send Private Message   Edit Post      
If you are on a stock sized turbo, 264's are good and will yield a gain but not a whole lot. Anything smaller and your not going to really gain anything for the cost, time and labor. Might as well stay with the OEM cams.



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Defiant
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Galant VR-4 org Post #: 1240279 posted 11/01/17 02:08 PM     Remind Me!  Send Private Message   Edit Post      
I have an FP Red and I'm wanting to increase spool time. Currently have 272/280 cams but thinking of going smaller.



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fuel
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Galant VR-4 org Post #: 1240308 posted 11/02/17 10:39 AM     Remind Me!  Send Private Message   Edit Post      
the stock cams are about 252/256 duration, so 242 would be a big down-grade. As others have pointed out, 264 duration cams are just about right, and incidentally are what the Evo 8 are running stock.



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Galant VR-4 org Post #: 1240309 posted 11/02/17 11:53 AM     Remind Me!  Send Private Message   Edit Post      
You can improve spool via tuning. You can also swap in smaller cams tailored to better spool, but I'd bet you'll probably see minimal gains, especially without being able to degree the cams. The FP Red is a middleweight journal bearing turbo in a bolt-on FP turbine housing. There's probably not a whole lot you can do to get great spool up out of that turbo. A similarly sized ball bearing turbo would net you much better spool up times, no doubt.

If you want any meaningful advice, you'd need to provide a log of a 3rd gear pull showing your current tune and resulting spool times. A comprehensive mod list of what's currently done to your car would be required as well. Absent that data, any advice given is simply food for thought. My gut feeling would be there's probably ground to be gained in spool up times by simply tweaking your tune.

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Galant VR-4 org Post #: 1240366 posted 11/05/17 02:19 AM     Remind Me!  Send Private Message   Edit Post      
what are you revving the car to? what's the intake manifold & head setup?

I doubt for most people that a 280 is a good choice. Personally, straight 272 or even 264/272 is probably a more fun street car, and overall if you're on a 2.0 revving under 9k, probably a better choice.

That said, which cam makes a big difference, between HKS/BC/GSC/JUN/etc. so...



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Defiant
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Galant VR-4 org Post #: 1240394 posted 11/07/17 06:49 AM     Remind Me!  Send Private Message   Edit Post   
Stock intake manifold
Fully built head
Revving to 8k

These are regrinds to HKS specs.

I'm defiantly going to go with a smaller cam setup. I'm leaning more towards the 264/272 cam setup.



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