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**Trent** · 1-12-08, 12:13

To determine the amount of fuel you can supply with your AFPR or FMU follow this calculation:

Fuel pressure @ rail = Rise x boost + idle pressure
Example: 10 x 5 + 50 = 100psi

So using a 10:1 FMU at 5 psi will yield 100psi at the rails. Generally, you don't want to go over about 100-110 psi, so a 12:1 would be too much according to that calc. Depending on your injectors and ultimate horsepower goal, an 8:1 may be sufficient.

cf_z, have you ever measured your fuel pressure at full boost?

1-12-08, 12:13	#3 (permalink)
Trent "Dark Side" of the moon Join Date: Jul 2003 Location: The Mosquito State, LA, USA Age: 25 iTrader: (0)	To determine the amount of fuel you can supply with your AFPR or FMU follow this calculation: Fuel pressure @ rail = Rise x boost + idle pressure Example: 10 x 5 + 50 = 100psi So using a 10:1 FMU at 5 psi will yield 100psi at the rails. Generally, you don't want to go over about 100-110 psi, so a 12:1 would be too much according to that calc. Depending on your injectors and ultimate horsepower goal, an 8:1 may be sufficient. cf_z, have you ever measured your fuel pressure at full boost? Last edited by Trent : 1-12-08 at 12:17.
	It's a well-known survival tip that you should always carry around a length of ethernet or fibre cable when traveling in wilderness areas. If you get hopelessly lost, bury it. Then you can ask the backhoe operator for directions when he cuts through it. '91 Miata: Turbo.