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ok.. just a question.. what if i want to put turbo in my car and i decided to get low comp pistons first for me to prepare my engine for a turbo(just an example)... will i actually lose hp? and will lowering the comp help with n2o? i hope this is not a repost.. coz i cound't find the answer i was lookin for.. thanks!

 
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if u lower the compression u will lose power if u go n/a but for boost u wont

 
Rep Power: 311

no matter what you do, turbo, nitrous, etc...

higher compression = higher cylinder pressure
higher cylinder pressure = more power

the only reason to lower the compression would be to run more boost on pump gas. When you raise the conpression, you run more of a risk of detonation.

 
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yes, i know that was a somewhat skewed reply, but it is true in most cases. I know timing, fuel, etc. etc. comes in to play, but that explains the jist of it.

 
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n/a or boost, lowering compression will cost you power.

lower cr makes tuning a boosted car easier due for only one reason. more tolerance for a/f errors.

having a higher cr is good, because it give you better off boost throttle response. that is the reason why monster boost cars don't like to be driven on the streets. at stop and go traffic, they feel like dogs, because no boost + low low cr + retarded timing = less power than stock at low rpm.

 
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lowering compression will lose power when not making boost, but will aloow for more boost to be put in the engine...

 
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that is correct, but only if you consider .1 cr to a .1 % more psi a huge amount of boost you can add to the engine.

the compressed ratio makes a huge difference in tolerance but not that much different in the phyical amount of max boost you can put to the motor.

 
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so being able to boost higher will make up for the power lost.
Correct?

 
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In a way I guess. You are comparing two different aspects of setups. You would want a more error tolerable motor so you can boost more with less wories. In turn that = a larger amount of power. The ratio of added boost to lowering the compression is higher. Going from a 10:1 with 6IB Boost and lowering to lets say 9:1 ratio and 14 IB boost makes the second situation more favorable just for power. It is less favorable for street driving, and having a more smoothed out torque curve. As well, you will notice later with the lower compression. By buddies t-4 on his s2k spools at very low rpm's due to the 11:1:1 compression.

OVERALL:

What is it that you want and why? If you are going to boost, swap the pistons, rods, etc.

If you want to see 200 something WHP on N/A, get cams and higher compression. Just dont wait for the torque too long

 
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"you will notice the turbo spooling later with lower compression or higher in the rev range"

I dont know why I wrote that so wierd first.