http://www.solsticeforum.com/forum/s...ad.php?t=16715

Looks like were getting some help from the Solstice guys. 8.8-8.5:1 compression forged pistons along with forged rods.

 

we have forged rods already but hey if they are stonger...

you link is wrong BTW

 

fixed it. NOt sure on power levels yet, he said he will have a test set in about a week.

 

very interesting

 

8.8 and 8.5:1 hmmm less compression isn't stock 10:1 doesn't the higher compression give more power? idk lower compression for turbo or s/c maybe these would be better but aren't stock forged?

 

Yes these are low compression pistons and for those of us who are planning for higher levels of boost with turbo or supercharger. Stock rods are "forged" but these should be much stronger then the stock rods. And our stock pistons aren't forged.

 

2.2L is 10:1 compression, 2.4L is 10.4:1 compression...the 8.8:1 and 8.5:1 are for turbocharged applications looking to run large amounts of boost (15+psi). I wouldn't go any lower on a supercharged application unless I was planning to run the supercharger close to its limits.

 

what if we want to only run like 10-1psi I'll be happy around 275-300whp

 

can we make HIGHER compression ratio for those guys who want to remain N/A

 

I don't see why not but correct me if I'm wrong.

 

bump

 

should i go higher compression for (N/A) or lower compression to get boosted - which would be more cost effective (i.e dollars per HP)

 

I'd say F/I for bang for the buck. It would have way more torque as well.

To go high compression pistons, you'd really need some head work (valve train too) and cams to get the maximum gains.

 

so if i lower the compression ratio, ill be losing HP numbers until i get the s/c - am i right?

 

that is correct.

 

grrrr... what would the highest compression ratio i'd be able to make to support a s/c

also, how much $$ would this be + installation?

 

also- what would the HIGHEST compression ratio i'd be able to attain if i were to keep the car N.A

 

id say 8:5:1...that should let you run about 45-50 psi of boost

 

thanks mike, but i really wanna keep my car N.A - so whats the highest compression ratio for a Naturally Aspirated car? and what gains would i see?

 

well i was kiding about that level of boost..maybe 20's- to 30's possibly...and for NA you could prob get the highest compression pistons you could find and put them in there...with all the proper "alowances", you should see somewhat moderate gains from this...but i will say that the engines life will most likely be dramatically lowered

 

I believe your pistons are cast, not forged...so you would be correct.

 

I doubt 10 or 11 PSI will gain you 300 whp but it all depends on the size turbo. Even on a slightly higher compression, you're looking at low to mid 200s if you're properly tuned.

 

Yes. You would have to get them custom made though. Contact Karo @ www.carcustoms.net and he can get them made for you by Wiseco.

 

It all depends on what you want as far as power and money spent...that's what it really comes down to.

No one can honestly give you a dollar per HP ratio because there is no set amount of power either way. There are too many variables to determine how much power you'll gain under boost or staying naturally aspirated. This is something you'll honestly have to do research on and see what is available for your vehicle, what others have done (their results) and what you'll personally like.

Just remember, if you do stay N/A, there is alot more that you'll have to do to gain power than just your pistons and with boost, there will be alot more maintenance for you to keep up with.

 

Please don't tell people stuff like this...

You could be running 12:1 compression and run 20 PSI, it's all in how you're tuned.

Also, you can't base a certain amount of PSI per compression nor can you give generalizations of PSI. Race cars run 45+ PSI but there is alot more than just turning up the boost.