Power Adders Technical discussion related to Turbos, Superchargers and Nitrous Oxide
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Any FI guru's have views on this?

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Old Jan 8, 2003 | 05:41 PM
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i have a question about that equation...do you use the hp rated to the motor or to the wheels? & are the other numbers the same for all cars?
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Old Jan 8, 2003 | 07:08 PM
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Either, depending on which number you want to know.
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Old Jan 8, 2003 | 09:02 PM
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also does the compression ratio matter...i have an h22 the stock comp was 10:1 or 10.4:1 but now it is 8.8:1...will this make a difference?
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Old Jan 9, 2003 | 04:03 AM
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Theoretically yes, but for calculation purposes don't worry about it.
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Old Jan 19, 2003 | 03:07 PM
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Originally posted by "Levi"




You really need to lean that bitch down a bit.






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Old Jan 19, 2003 | 09:50 PM
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Actually, if my memory serves me correctly 14:1 is the perfect stoichiometric ratio for air fuel combustion.

This is also the ratio that will give you the most power per quantity of fuel assuming you can use this ratio without detonation.

The only reason to go any lower is to reduce the risk of detonation in high compression or forced induction motors.

For that reason I would say it is not lean, but just not rich enough for use under adverse conditions.

If your view of mild compression is less than 10:1 that a/f ratio would be just fine for a n/a motor and should be pretty close to what all modern closed loop emissions motors are trying to keep their mix rate at.
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Old Jan 19, 2003 | 11:58 PM
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Originally posted by "400HP930"

Actually, if my memory serves me correctly 14:1 is the perfect stoichiometric ratio for air fuel combustion.

This is also the ratio that will give you the most power per quantity of fuel assuming you can use this ratio without detonation.

The only reason to go any lower is to reduce the risk of detonation in high compression or forced induction motors.

For that reason I would say it is not lean, but just not rich enough for use under adverse conditions.

If your view of mild compression is less than 10:1 that a/f ratio would be just fine for a n/a motor and should be pretty close to what all modern closed loop emissions motors are trying to keep their mix rate at.

Wow, you just proved that you really don't have too much field experience, if you know what I mean with tuning performance engines. Books are great, but test some of the theories a little.

14+:1 will work great on high compression motors and boosted motors under low throttle, low load circumstances, but that is it. The burn would be WAY to hot under WOT causing extreme detonation and burning of the pistons and or valves.
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