Dyno problems

saltzstang · 10-31-2002, 03:40 PM

While dynoing my car this last weekend the air fuel ratio went to 17:1 as soon as we shot 150-hp at 3500 rpm . The dyno operator shut everything down in enough time that no engine damage occured. I have a walboro 190-lph in tank pump with factory lines, new fuel filter(high flow), and a kirban adj. fuel reg set to 40 psi ,24 pound inj.. Everything ran fine on 80 hp shot. On motor made 260 at the wheels on a mustang dynometer . The n2o kit is made by nitrous works and is obviously a wet kit. Im pretty sure the kit robbed the fuel pressure from the motor. So with all that said has anyone experimented with adding an in-line pump after the in-tank pump to boost flow/pressure available at the regulator.

RPM427 · 11-01-2002, 12:21 AM

Are you sure you jetted the fuel correctly when you changed to the 150 setting? What was the FP doing when you hit the nitrous? It is a possibility that you may need to jet the fuel up to reach the required level of enrichment.

saltzstang · 11-01-2002, 11:42 AM

yes ,jetted correctly/fp@40psi, think my walboro pump(190) not enough,may try 255 holleywhat ya think?

RPM427 · 11-01-2002, 07:07 PM

the 255 should be plenty, Thats what i am running with a 125 Zex kit

10-31-2002, 03:40 PM	#1
saltzstang Registered Member Join Date: Sep 2002 Location: southeast texas Posts: 90	Dyno problems While dynoing my car this last weekend the air fuel ratio went to 17:1 as soon as we shot 150-hp at 3500 rpm . The dyno operator shut everything down in enough time that no engine damage occured. I have a walboro 190-lph in tank pump with factory lines, new fuel filter(high flow), and a kirban adj. fuel reg set to 40 psi ,24 pound inj.. Everything ran fine on 80 hp shot. On motor made 260 at the wheels on a mustang dynometer . The n2o kit is made by nitrous works and is obviously a wet kit. Im pretty sure the kit robbed the fuel pressure from the motor. So with all that said has anyone experimented with adding an in-line pump after the in-tank pump to boost flow/pressure available at the regulator. __________________ AFR 1492 heads,Track Heat Intake, d.s.s super pro bullet 331, lakewood bell, king cobra, 3550 ,UPR shifter, aluminum shaft, 4.10, 31-spline, spool,hoosier27x10, moroso ds-2, 175-juice, egt...11.40 on motor spray pass coming.

11-01-2002, 12:21 AM	#2
RPM427 Registered Member Join Date: Aug 2001 Location: Huntington NY Posts: 573	Are you sure you jetted the fuel correctly when you changed to the 150 setting? What was the FP doing when you hit the nitrous? It is a possibility that you may need to jet the fuel up to reach the required level of enrichment. __________________ -1993 Mustang, 900rwhp 03-04 cobra based 4v swap, full Griggs setup, project underway -1994 Ranger w/ 427cid windsor (daily beater) check it out!

11-01-2002, 11:42 AM	#3
saltzstang Registered Member Join Date: Sep 2002 Location: southeast texas Posts: 90	yes ,jetted correctly/fp@40psi, think my walboro pump(190) not enough,may try 255 holleywhat ya think? __________________ AFR 1492 heads,Track Heat Intake, d.s.s super pro bullet 331, lakewood bell, king cobra, 3550 ,UPR shifter, aluminum shaft, 4.10, 31-spline, spool,hoosier27x10, moroso ds-2, 175-juice, egt...11.40 on motor spray pass coming.

11-01-2002, 07:07 PM	#4
RPM427 Registered Member Join Date: Aug 2001 Location: Huntington NY Posts: 573	the 255 should be plenty, Thats what i am running with a 125 Zex kit __________________ -1993 Mustang, 900rwhp 03-04 cobra based 4v swap, full Griggs setup, project underway -1994 Ranger w/ 427cid windsor (daily beater) check it out!

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