boost vs. fuel requirements

Unit 5302 · 12-24-2001, 07:13 PM

Procharger indicates a 75% increase in power running on a stock engine at 14psi.

225hp x .75 = about 155hp. That's NOT to the wheels. Now 225+155 = 380hp at the crank. RWHP with his AOD is likely to be about 300. 19lb/hr injectors can support nearly 350hp, WITHOUT an FMU. Just with an AFPR and streching the injection cycle a little.

At ProChargers estimated gains, he'll be sitting at about 380hp, which would require a 4:1 FMU, or about 62psi on 24lb/hr injectors at the stock injection cycle. At 400hp, he'd need 69psi, or a 4:1 FMU. At 450hp (which is what ProCharger suggests performance may be at 17psi), he'll need 87psi, or a 6:1 FMU.

There are people on this board that are/have running/run near 500RWHP on 30lb/hr injectors. That's more like 600 crank hp on 30lbers.

In other words, the 24s will be just fine on an engine making what HP ProCharger suggests performance will be.

An FMU is NOT a band aid for fuel problems/injectors. It is a tuning tool that should be present on a forced induction car. If he runs a 6:1 FMU he's going to be completely fine, but like I said, if he's going to do anything in the way of mods, he'll be pushing the 24's.

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12-24-2001, 07:13 PM	#1
Unit 5302 Registered Member Join Date: May 1999 Posts: 5,246	Procharger indicates a 75% increase in power running on a stock engine at 14psi. 225hp x .75 = about 155hp. That's NOT to the wheels. Now 225+155 = 380hp at the crank. RWHP with his AOD is likely to be about 300. 19lb/hr injectors can support nearly 350hp, WITHOUT an FMU. Just with an AFPR and streching the injection cycle a little. At ProChargers estimated gains, he'll be sitting at about 380hp, which would require a 4:1 FMU, or about 62psi on 24lb/hr injectors at the stock injection cycle. At 400hp, he'd need 69psi, or a 4:1 FMU. At 450hp (which is what ProCharger suggests performance may be at 17psi), he'll need 87psi, or a 6:1 FMU. There are people on this board that are/have running/run near 500RWHP on 30lb/hr injectors. That's more like 600 crank hp on 30lbers. In other words, the 24s will be just fine on an engine making what HP ProCharger suggests performance will be. An FMU is NOT a band aid for fuel problems/injectors. It is a tuning tool that should be present on a forced induction car. If he runs a 6:1 FMU he's going to be completely fine, but like I said, if he's going to do anything in the way of mods, he'll be pushing the 24's.