How's 9.0 CR sound for 15psi on a 370?
#1
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How's 9.0 CR sound for 15psi on a 370?
Just like the title says. I've been researching what CR i should shoot for on my new motor (forged 370) and i know it would be fine at 8.5:1 but i just feel that it would be too sluggish when not in boost. So i was thinking 9:1 should be a bit better but still handle a decent amount of boost. What are your thoughts? Thanks
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ive almost got my 370 finished im going to run around 9.5-1 cr , i havent ordered head gaskets yet though so i have little play. like you said i dont want it to be sluggish when not in boost. and since i dont plan to run it with 15 psi daily i can use race gas for the track. i will run close to 12-13 psi on the street. im also planning on using a good shot of nitrous(150) with the higher boost though.
#7
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Originally Posted by parish8
i dont think it matters too much. you will probably need meth or race fuel to get to 15psi with either ratio.
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#8
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i think it has something to do with cylinder presures but there are a ton of factors and i dont really know how it all works. i do know that 15psi is a lot.
on a stock lq4 you can typicly goto 6-7psi without an intercooler on pump gas
not 100% sure on this but i think a stock lq4 with an intercooler would add about 3psi to that so about 9psi is a safe limit on pump gas.
now drop the cr .5 to 1 point and that would probably add about 1-2psi more on pump gas. that gets you to 10-11psi.
spray some meth and get another 4-5psi on the same pump gas. that gets you up to around 15psi.
these are real word examples i have seen on the street with diferent set ups. there have been a lot of other factors like a cam swap or more cubes but i think it is prety acurate overall. there is just a limit to what you can do on pump gas.
on a stock lq4 you can typicly goto 6-7psi without an intercooler on pump gas
not 100% sure on this but i think a stock lq4 with an intercooler would add about 3psi to that so about 9psi is a safe limit on pump gas.
now drop the cr .5 to 1 point and that would probably add about 1-2psi more on pump gas. that gets you to 10-11psi.
spray some meth and get another 4-5psi on the same pump gas. that gets you up to around 15psi.
these are real word examples i have seen on the street with diferent set ups. there have been a lot of other factors like a cam swap or more cubes but i think it is prety acurate overall. there is just a limit to what you can do on pump gas.
#9
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I don't know about 3 psi from the intercooler -- guess it depends on the intercooler efficiency and flow, but I've seen applications that add 5-6psi from the FMIC on LQ9s -- for a total of 11-12psi.
Swap in the right cam, though, and you can get higher boost.
I'd be running meth at 15psi, personally -- hard to argue with the benefits for high boost.
Swap in the right cam, though, and you can get higher boost.
I'd be running meth at 15psi, personally -- hard to argue with the benefits for high boost.
#10
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I ran my old setup at 8-10lbs with no intercooler and pump gas for about 1.5yrs, wasnt getting much timing 12-13deg. So far I am running less boost with the intercooler just because of the fact that I like the way it runs. Lower boost level but still more power the when I was at 8-10lbs. This is on a LQ4