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high compression throw off air/fuel ratio???

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Old 04-23-2011, 08:41 AM
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Default high compression throw off air/fuel ratio???
so here's the deal...will be running b16a2 head with b16a block with ctr pistons.....with basic bolt ons...now my question is will running the higher compression throw off my air/fuel ratio running the oem b16A2 ecu? and dont tell me to get it tuned if im scarred obviously i know that...making it simple...will it throw it off or no when running it? thanks n lmk
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Old 04-23-2011, 08:56 AM
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Default Re: high compression throw off air/fuel ratio???
Do you mean is it going to be able to be read properly? If so then yes its still going to be accurate.
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Old 04-23-2011, 09:27 AM
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Default Re: high compression throw off air/fuel ratio???
yea its going to be off, the stock ecu can only compensate for so much change from stock
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Old 04-23-2011, 11:25 AM
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Default Re: high compression throw off air/fuel ratio???
so with the higher compression in a b16a than the b16a2 block the air fuel ratio will be richer or leaner with my b16a2 ecu???
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Old 04-23-2011, 11:29 AM
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Default Re: high compression throw off air/fuel ratio???
yes it will.....leaner....
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Old 04-23-2011, 02:54 PM
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Default Re: high compression throw off air/fuel ratio???
Why would increasing compression ratio make the oxygen sensor read leaner?
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Old 04-23-2011, 04:52 PM
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Default Re: high compression throw off air/fuel ratio???
i dont see how it would affect the a/f mix at all.
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Old 04-23-2011, 07:40 PM
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Default Re: high compression throw off air/fuel ratio???
Originally Posted by ddd4114
Why would increasing compression ratio make the oxygen sensor read leaner?
It doesnt.... the raised compression=more air = the need for more fuel

Originally Posted by SolScifen
i dont see how it would affect the a/f mix at all.

Originally Posted by ReDHaTcHyGuy
yea its going to be off, the stock ecu can only compensate for so much change from stock
x2

Short term fuel trim can only do so much before it sets a code....
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Old 04-23-2011, 09:32 PM
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Default Re: high compression throw off air/fuel ratio???
Why does raising the compression ratio induct more air?
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