back when i was deep into toyotas, they spoke of 8.7/8:1 being the most ideal cr for a street car. however, most other companies i have seen doing boosted engines factory were in the 7.x:1 area for compression.
personally, i would rather have 9:1 with good internals. during previous turbo engine builds (honda, mostly), i have found this number to be the best for a street car application (300-ish whp). for those with higher goals, but small pockets, lower cr would be better due to the margin of error with the lower cr.
just remember, it takes more "psi", from the same set-up (turbo, etc), for a lower cr (7:1) engine to make the same power as one with higher (9:1) cr. there is a limit to the application of that comment though, but thats a different conversation.
personally, i would rather have 9:1 with good internals. during previous turbo engine builds (honda, mostly), i have found this number to be the best for a street car application (300-ish whp). for those with higher goals, but small pockets, lower cr would be better due to the margin of error with the lower cr.
just remember, it takes more "psi", from the same set-up (turbo, etc), for a lower cr (7:1) engine to make the same power as one with higher (9:1) cr. there is a limit to the application of that comment though, but thats a different conversation.
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