compression ratios....

[eward]

why is lowering the c/r better? cuz however i think of it...a higher c/r would mean more air turbulence and wouldn't that be more volatile? and if its more compressed and then you ignite it...wouldn't it be more efficient? or am i totally off...cuz i have nothing to base it on....

[97teg]

yes, a higher c/r makes a more efficient combustion, but you can only compress gas so much before it detonates. this is rated by its octane number. the higher the number, the more you can compress it before detonation.

when you slap a turbo on a car that already has to run on premium, it is most likely going to detonate. because a turbo compresses air and forces it into the combustion chamber, then you have the piston that will compress that air/fuel even more. so either you would have to use racing gas with a higher octane rating, or you would have to lower the engines compression ratio, so it could run on pump gas.

[big black jew]

lower cr is better for running a turbo, but if your staying na, then stay with a higher cr

[edspecR]

very cool...thanks yall.

[kane2g]

i will somewhat disagree with this

lower cr is better for running a turbo

Its not better, its rather safer. The thing with turbo is that people build low comp engines and then boost them to huge PSI numbers and get the same power as same engine w/ higher compression ratio and less boost. which one is better depends on your perspective. but you still have to run the high octane gas like 97teg said. But dont think you're cool to run 30PSI of boost with shitty compression ratio
just my 2 cents

[jOYRiDe]

yeah me too, running a low CR is good for mileage and efficiency also

[ivymike1031]

huh? you meant a high compression ratio for efficiency, right?

[mellowboy]

Here read this http://www.automotiveforums.com/vbul...5&pagenumber=1

I was arguing about the cr with MatT3T4 but i finally understand him. So read it and u'll know why