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Old 02-17-2009, 05:19 PM   #1
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Default what compression ratio for more boost

curently running 17psi what would be a good compression ration if i wanted to up the boost to around 25psi and what make rod/pistons would be good i know weisco ones are top not but ideally want some a little more pleasing on the pocket

thanks
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Old 02-17-2009, 05:29 PM   #2
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1:1
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Old 02-17-2009, 05:30 PM   #3
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Quote:
Originally Posted by madmalc View Post
I'm currently running 17psi. What would be a good compression ratio[n] if I want[ed] to up the boost to around 25psi? What make rod/pistons would be good? I know Weisco's are top notch but, ideally I want some a little more pleasing on the pocket.

Thanks!
What's your setup? What turbo? What's the car used for? How much power are you looking to make? Is English your first language? Are you 17 and from California by chance?
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Old 02-17-2009, 05:35 PM   #4
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What's your setup? What turbo? What's the car used for? How much power are you looking to make? Is English your first language? Are you 17 and from California by chance?
sorry for my punctuation spend alot of time on msn messenger

no i'm not 17 nor am i from california i am a 22 year old mechanic from england

im using a gt2876r ball bearing garret item it gets used as a daily driver and as a track toy my friends have skylines and evo's and i am on a quest for more power from what they call my hairdresses car

it currently produces 277bhp from a 1600 and i dont want to up cc
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Old 02-17-2009, 05:38 PM   #5
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What the **** mate? Why dont you learn how to use bloody periods and capitals you ******* ******. Does this look like msn messenger to you?
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Old 02-17-2009, 05:41 PM   #6
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Old 02-17-2009, 05:46 PM   #7
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why don't you **** suckers go bitch somewhere else

madmalc it is really kind of a trade-off. The higher compression your pistons are the more power you will make off boost, but the less air you can cram in. Pistons with lower compression have less power off boost, but help you cram more air into the motor.
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Old 02-17-2009, 05:49 PM   #8
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What the **** mate? Why dont you learn how to use bloody periods and capitals you ******* ******. Does this look like msn messenger to you?
Sorry i appoligised! Dont particually like being called a ******* ******

I asked quite a sensible question, which i had hoped i would get a sensible answer! Oh how wrong could i be! Quite right, how the question was written wasn't very well worded but it was easy enough to understand.

Certainly looks welcoming to a newbie if this was the 1st post they read.
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Old 02-17-2009, 05:50 PM   #9
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Quote:
Originally Posted by mazda/nissan View Post
why don't you **** suckers go bitch somewhere else

madmalc it is really kind of a trade-off. The higher compression your pistons are the more power you will make off boost, but the less air you can cram in. Pistons with lower compression have less power off boost, but help you cram more air into the motor.
WTF? This isn't m.net. He types like a 17 year old kid, doesn't search, and expects serious responses?
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Old 02-17-2009, 05:54 PM   #10
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Quote:
Originally Posted by mazda/nissan View Post
why don't you **** suckers go bitch somewhere else

madmalc it is really kind of a trade-off. The higher compression your pistons are the more power you will make off boost, but the less air you can cram in. Pistons with lower compression have less power off boost, but help you cram more air into the motor.
I understand the lower/high compression ratio pros/cons, just really wondered what other people were using for similar boost levels and which makes were good and recomended

To be totaly honest money isn't the issue here more the fact of what is good and well recomended
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Old 02-17-2009, 05:54 PM   #11
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not every thread needs to become a flame... simple typing errors aren't enough cause to deface a thread that could yield useful info even if the topic has been covered before imo.
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Old 02-17-2009, 05:58 PM   #12
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this is the engine bay

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Old 02-17-2009, 06:02 PM   #13
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at miata.net they are more concerned with spelling and grammar than they are about compression ratios. so no, this is not miata.net
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Old 02-17-2009, 06:04 PM   #14
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at miata.net they are more concerned with spelling and grammar than they are about compression ratios. so no, this is not miata.net
I'm sorry but seriously, if you dont put thought and care to neatly organize your thoughts into coherent posts then why should others? You know what im saying?
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Old 02-17-2009, 06:06 PM   #15
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Quote:
Originally Posted by ThePass View Post
not every thread needs to become a flame... simple typing errors aren't enough cause to deface a thread that could yield useful info even if the topic has been covered before imo.
Agreed. He can just type like a normal person and the discussion go forth. There's a difference between a typo and I-don't-give-a-****-how-I-type. Anyways, he says he's from England, so I'll back off if he tries to type decent. But his first post was not even trying. That wasn't "simple typing errors" as the kid from Cali says... Like the OP said, imagine what all the newbs will think if they come here and see a bunch of kids that can't even type. Looks like the OP is typing fine now.

madmalc- most here don't build setups to run 25 PSI, so real world info is tough to come by. Around 9:1 comp is usually what most run for big boost/big power turbo setups. Personally, I would recommend 8.5:1 or so unless you plan on swapping in a huge set of cams where you'll need the extra comp to get your effective compression ratio back up. hustler on the forum recently had very good results running 8.5:1 compression with a similarly sized turbo. Do a search for threads started by him and you'll find plenty of info on his setup and dyno graphs.
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Old 02-17-2009, 06:06 PM   #16
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possibly a little jelousy from patsmx5 and saml01 because i want to run 25psi of boost :(

any sensible answers would be great i know a bit lazy but i dont have time to trawl through all threads with 25psi in
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Old 02-17-2009, 06:07 PM   #17
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FWIW; I just bought these: BELFAB RACING PRODUCTS

And I think another forum member did too. I bought mine with 9.0:1 compression. They have other options.
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Old 02-17-2009, 06:08 PM   #18
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at miata.net they are more concerned with spelling and grammar than they are about compression ratios. so no, this is not miata.net
You knew what I meant y8s.
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Old 02-17-2009, 06:34 PM   #19
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8.5:1 Supertech pistons.

Belfab rods.
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Old 02-17-2009, 06:35 PM   #20
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You knew what I meant y8s.
I did, but at the same time, I know you guys hate to see this place fill up with dum noobs the same way I hate to see this place fill up with eleventy billion Catman style "fix yer grammar" posts.
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