compression ratio vs boost psi

[EK4R]

was using shell before in the dc5 which wasn't turbo'ed

seemed ok. but dont want to run a batch of bad oil. think il stick to BP like before.

[crx_boy7]

more comp less boost = not much power potential
less comp more boost = good power
very low comp, extreme boost = will give insane power

the amount of power your engine makes is limited to its flow characteristics and how much it can take before pinging,

higher compression will result in a more responsive and fuel efficient engine

but boost is also limited to how much fuel you dump into the engine

1 of hondas F1 engines has 6:1 compression with something like 60psi to make over 700hp from a 1.5L

[IEVAQ8]

more comp less boost = not much power potential
less comp more boost = good power
very low comp, extreme boost = will give insane power

not sure where ur theory comes from, czn u back it up???............excluding the F1 stuff that has millions of dollars spent on research and developement???

[WATAJK]

BP ultimate and synergy 8000 both good fuels

thank god, there the only 2 ill use

[crx_boy7]

not sure where ur theory comes from, czn u back it up???............excluding the F1 stuff that has millions of dollars spent on research and developement???

im not sure either, do some research and if you can proove it wrong pls post

to get past this problem there is a way to cheat out compression, volvo and a few other manufacturers are duing this, volvos system incorporates a variable height deck, than can lift the head along with the sleeves to increase/decrease compression

[DLO01]

1 of hondas F1 engines has 6:1 compression with something like 60psi to make over 700hp from a 1.5L

That was with old 80's technology.......

Now, higher compression, more responsiveness, better reliabilty you'll acheive the same figure. So therefore, more compression the less boost you need to run to acheive the same figure.

[ZeForce]

Also, an engine like that designed purely for racing application would be useless on the street

[VTi_b0i]

That was with old 80's technology.......

Now, higher compression, more responsiveness, better reliabilty you'll acheive the same figure. So therefore, more compression the less boost you need to run to acheive the same figure.

exactly! i dont know about anyone else but id much rather make for instance 200kw atw on say 7psi then the same figure on like 15psi? its a no brainer... my compression is at 11.4-1 only running 7.5psi daily and occasionally 9psi and its great.

[IEVAQ8]

im not sure either, do some research and if you can proove it wrong pls post

the best proof i can give u is in my own ITR.............

stock b18c7 with a gt30, full race mani, 7.5psi making a healthy and very respectful 239.8kw daily driven, and after a whole year of daily driving, 3or 4 1/4mile drag nights/days and plenty of street thrashing/racing, it still made a healthy 240.5kw on the same dyno as it was tuned.........

it made it a very responsive and very fun to drive, and due to the high stock compression, it could be driven as if it was na under 4500rpm on light throttle and no one would know the difference.........

[Lukezen27]

the best proof i can give u is in my own ITR.............

stock b18c7 with a gt30, full race mani, 7.5psi making a healthy and very respectful 239.8kw daily driven, and after a whole year of daily driving, 3or 4 1/4mile drag nights/days and plenty of street thrashing/racing, it still made a healthy 240.5kw on the same dyno as it was tuned.........

it made it a very responsive and very fun to drive, and due to the high stock compression, it could be driven as if it was na under 4500rpm on light throttle and no one would know the difference.........

I think that's also a very good example of just how difference buying quality parts and planning your intended power out-put can be.

Man I can't believe some A-hole sole your car!

[Limbo]

high comp is good, but the reason why people go lower comp is so they can run more boost and make more power reliabily without race fuel.
Reason is our fuel is not up to scratch. If you could get consistent race fuel all the time, a high comp motor with high boost is fine. The low comp motors compensate for the occasional crap fuel without killing the motor completely.

[IEVAQ8]

I think that's also a very good example of just how difference buying quality parts and planning your intended power out-put can be.

Man I can't believe some A-hole sole your car!

thanks luke........

and i still sook about it not being here in my posetion in my garage to be taken for a drive when ever i want.............. it sucks hard............