[bcjjones]

Got a couple custom cam recommendations. All pretty close to each other. All were a 114 LSA. I messaged one company, I won’t mention the name, and they were in line spec wise with everyone else. A little more duration, in the 230’s at .050, then the others but they cam only was $800 bucks! I’ve seen some awesome builds from them but man that seemed pretty steep comparatively.

Questions for the gurus and this is stemmed from a gentleman I’ve come to really trust on another forum. He says that boost being blown out the exhaust is a myth generally speaking on a supercharged engine. Boost levels of about 15psi or less, the cam overlap doesn’t have nearly the affect it does on say a turbo engine running 20 plus psi. In his opinion, and others online from different posts I’ve read through, the 110lsa on an 8-10 psi motor is possibly better. The supercharger makes up the torque in the lower RPM range and the tighter LSA helps in the upper where the supercharger starts to run out of breath.

Im just conflicted on if it’s really worth $800-$1000 bucks and the time to change it. I was thinking much of the boost is getting “blown out the exhaust” but if that’s truly not the case, then how much power is there really to be made?

 

[bcjjones]

There is way more to cam timing than just the duration, lift and LSA numbers. Think about the lobe shape and what's happening at the crank position.
Trust the guys who make a great living.....not the joe blow internet know it all.

Definitely, and I’m inclined to believe the custom cam guys, but understandably they won’t weigh much into whether or not their cam will make more power than the current one. One did say his would make way more power below 4k rpm, which with my current traction issue, may not be a good thing 😂

 

[bcjjones]

Maybe I just need to pony up, swap the cam and answer my own questions. 50 hp is worth it for sure but 20 isn’t to me.

 

[bcjjones]

What would you expect them to say?
"Well, for $800 the best I can do is less than you have now"

I figured it was worth a shot to ask, but I knew the answer would be vague at best!

Honestly I need to start working on getting the power to the ground better. I’m looking into some adjustable shocks for the front and rear to help with the cal tracs I have installed. 20 hp would be achievable by swapping to a smaller blower pulley. Right now the 177 is 2.15 overdriven producing about 8 psi. Swapping to their 2.85” upper pulley would put it at 2.45 overdriven and I would guess about 10 psi. I hate to spin it that much but with the meth injection maybe the inlet temps won’t be so bad. I can’t find any solid info on max rpm but I have my redline set to 6250rpm. Which would put the blower speed, overdriven to the 2.45, at 15,300 rpm at redline.

One thing I haven’t done is check fuel flow. I have a nine boost referenced regulator right now. Th me AFR gauge never goes lean, which I would assume it would do if I was running out of fuel volume?