10.2:1 to 9:1 difference
03-15-2007, 04:47 AM
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10.2:1 to 9:1 difference
was running a stock b16a2 at 8psi, but damaged one of the pistons and had a set of gsr pistons which i made fit and now my compression ratio is 9:1. i can feel the throttle response is slower but my question is would i have to run 10psi to make the same power as before ?.
03-15-2007, 04:52 AM
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Re: 10.2:1 to 9:1 difference (flangemastermike)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by flangemastermike »</TD></TR><TR><TD CLASS="quote">was running a stock b16a2 at 8psi, but damaged one of the pistons and had a set of gsr pistons which i made fit and now my compression ratio is 9:1. i can feel the throttle response is slower but my question is would i have to run 10psi to make the same power as before ?. </TD></TR></TABLE>
You would have to run a higher psi to compensate for the lower compression but I dont know where you got 2psi more from.
You would have to run a higher psi to compensate for the lower compression but I dont know where you got 2psi more from.
03-15-2007, 03:30 PM
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Re: (flangemastermike)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by flangemastermike »</TD></TR><TR><TD CLASS="quote">it was a guess , any one got any experiance with this ?</TD></TR></TABLE>
It's really more about acceleration when it comes to staying at a relatively higher compression than a lower compression. What you're feeling is the OFF-BOOST effects of the lower static compression. Remember this, the actual power output doesn't change whether you have a low static compression or a high one. IT does take a bit more "boost" to get the same hp, but it does not change what the horsepower itself will be.
It's really more about acceleration when it comes to staying at a relatively higher compression than a lower compression. What you're feeling is the OFF-BOOST effects of the lower static compression. Remember this, the actual power output doesn't change whether you have a low static compression or a high one. IT does take a bit more "boost" to get the same hp, but it does not change what the horsepower itself will be.
03-15-2007, 06:57 PM
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Re: (bigbadboy)
I'm assuming it wasn't retuned after the fix. Running less compression means you can run more timing per lb of boost, and that you need to run a little more boost for the same power. Amount of boost is really irrelavant, its the power ceiling of the ringlands on the pistons you have. Cast pistons aren't all that great, regardless.
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03-15-2007, 07:22 PM
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Re: (bigbadboy)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bigbadboy »</TD></TR><TR><TD CLASS="quote">you lost 10hp 
ever point of compression is 10 hp less. look it up its been tested</TD></TR></TABLE>
Hmm interesting, B16's do gain about 10whp from CTR pistons, which is about a 1.0:1 jump in compression.
ever point of compression is 10 hp less. look it up its been tested</TD></TR></TABLE>Hmm interesting, B16's do gain about 10whp from CTR pistons, which is about a 1.0:1 jump in compression.
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