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Knock on the VQ37VHR - gear heads step inside

Originally Posted by JoeyD Yes your car would be tuned. However, a tune won't change your compression ratio. High Compression and FI don't go together well. If the VQ is

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Old 01-19-2009, 08:27 PM   #1 (permalink)
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Yes your car would be tuned. However, a tune won't change your compression ratio. High Compression and FI don't go together well. If the VQ is seeing knock with no boost it is undoubtably pulling timing and that results in a net power loss. Same will be true with FI only more timing will be pulled.
No a tune won't help the compression ratio go down any but actually compression is great with FI as long as it is safely tuned. You can get a lot more power per pound of pressure with higher compression. Just look at rsx-s boosted usually with 11.5:1 compression ratio and turboed making 500whp and safely tuned. It is ALL in the tune.
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Old 01-20-2009, 08:24 AM   #2 (permalink)
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No a tune won't help the compression ratio go down any but actually compression is great with FI as long as it is safely tuned. You can get a lot more power per pound of pressure with higher compression. Just look at rsx-s boosted usually with 11.5:1 compression ratio and turboed making 500whp and safely tuned. It is ALL in the tune.
I agree. High compression + FI might not always be the best for 93 octane, but it works great in race circumstances.

Anyone have the GTM graph?
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