Higher compression vs Lower compression pistons

[Hadi17]

guys ! I planned to change my Evo 3 pistons to a higher compression pistons like the 2JZ pistons ..
but recently i heard that higher compression pistons are no good for higher boost..:hmmmm:
if like that why some people convert their pistons to higher compression pistons ? what are the pros and cons of this higher and lower compression piston ?

need some help here ..:vollkommenauf:

 

[6UE5t]

Higher compression will make more power but if combined with high boost, you'll break the pistons/rods/crank etc. as the actual compression after boost becomes too high. That's why high boost needs lower compression.

High compression more suited for N/A engines, or low boost application (even that has to be coupled with careful engine management). If your engine is GDI, then it can have higher compression since the risk of detonation is much less.

Engine sifus here can CMIIW though since my knowledge is very limited on the surface only.

 

[Hadi17]

Higher compression will make more power but if combined with high boost, you'll break the pistons/rods/crank etc. as the actual compression after boost becomes too high. That's why high boost needs lower compression.

High compression more suited for N/A engines, or low boost application (even that has to be coupled with careful engine management). If your engine is GDI, then it can have higher compression since the risk of detonation is much less.

Engine sifus here can CMIIW though since my knowledge is very limited on the surface only.

thnxs bro .. even its limited i still admire that ..
thnxs !

 

[Waiora_ProTuner]

The total compression (dynamic) would be higher (so high), unless you're lowering the boost...

Static compression creates more heat..prone to detonation...air compress by compressor (as in turbo) would go through intercooler (or at least long enough route to be cooled slightly)...

For the same total compression, lower static compression would give better detonation elimination...but peakier torque curve (higher boost threshold)..higher static compression (low boost) would give better torque curve, but require more care for detonation..

But normally manufacturer just go for bigger engine low boost...or low static ratio and low boost..so no problem here...