Is this true or not?
10-28-2009, 06:14 PM
#1
Is this true or not? I was just told that when you tune 60 lb. motoron's with efi live you need to set it at 70 lb. injectors because the computer thinks the 60's are smaller than they really are and make them work harder. Is this true and may this be why im loosing so much fuel pressure at wot?
10-28-2009, 06:47 PM
#5
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your fuel pressure should not be going that low, something isnt right there. most fuel systems run at 3 bar ratings, 3 bar equals 43.5 psi. our cars run at 4 bar, so therefore we have 58 psi of fuel pressure. so 43.5/60 is to 58/x. The injectors are actually 80 lb injectors if my math is correct.
10-28-2009, 08:40 PM
#7
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That kind of fade is just nasty, I think you need to
upgrade some plumbing and possibly electrical. At
least verify that the voltage at the pump is hanging
tough, maybe the BAP is sleeping on the job or
something. You can't tune for consistency when
you don't have any, in the fundamentals.
upgrade some plumbing and possibly electrical. At
least verify that the voltage at the pump is hanging
tough, maybe the BAP is sleeping on the job or
something. You can't tune for consistency when
you don't have any, in the fundamentals.
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10-29-2009, 07:20 AM
#8
First, you set them larger in the tune b/c they are rated at 43.5 psi but you are running them at 58 psi, as stated previously. Using the RC Engineering calculator, that comes to about 69-70 psi.
Second, with your power output, and being boosted (which raises your BSFC) you are right on the borderline for a single Walbro pump. As jimmyblue recommended, check your voltages at the pump at WOT. A boost-a-pump will raise the voltage during boost, to the hotwire kit voltage (usually 13.7-14.5v) plus whatever voltage the BAP is set at. For example, if the hotwire kit raises your pump voltage to 13.7 v and you have the BAP set to 3 v, it will raise the fuel pump voltage to 16.7v. If your voltage is good, you have a restriction. Usually the pump itself, unfortunately.
Second, with your power output, and being boosted (which raises your BSFC) you are right on the borderline for a single Walbro pump. As jimmyblue recommended, check your voltages at the pump at WOT. A boost-a-pump will raise the voltage during boost, to the hotwire kit voltage (usually 13.7-14.5v) plus whatever voltage the BAP is set at. For example, if the hotwire kit raises your pump voltage to 13.7 v and you have the BAP set to 3 v, it will raise the fuel pump voltage to 16.7v. If your voltage is good, you have a restriction. Usually the pump itself, unfortunately.
