Latest fuel pump upgrade test..
Thread Starter
PLATINUM SPONSOR
Joined: Jun 2008
Posts: 3,834
Likes: 65
From: Texas
2003 CL55
Latest fuel pump upgrade test..
I replaced my stock high pressure pump with a bosch 044 .. This pump in conjunction with a high flow intank pump should flow for 600 plus rwhp on paper..
Made a few test runs and still have a large pressure drop above 5K.. This pump seems about the same as the stock pump.. I focussed more on psi drop vs trying to graph the exact psi to rpm change.. I did not see psi go below 65 psi this time and it seemed to hold 70 psi out longer. Either way, 78-79 psi is normal and I am still seeing a 10-15 psi drop above 5000k..
1)Any I deas?
2) Anyone check thier pressure on stock or light moded cars?
3) Maybe AMG drops pressure for more volume? Just a wild guess.Need to know what a stock psi shows.
I am stuck right now and not sure what to try next.. It is hard for me to see that 5-6mm ID fuels lines are not a potential flow issue..
Here is the pump , before i fastened down and insulated it..
Made a few test runs and still have a large pressure drop above 5K.. This pump seems about the same as the stock pump.. I focussed more on psi drop vs trying to graph the exact psi to rpm change.. I did not see psi go below 65 psi this time and it seemed to hold 70 psi out longer. Either way, 78-79 psi is normal and I am still seeing a 10-15 psi drop above 5000k..
1)Any I deas?
2) Anyone check thier pressure on stock or light moded cars?
3) Maybe AMG drops pressure for more volume? Just a wild guess.Need to know what a stock psi shows.
I am stuck right now and not sure what to try next.. It is hard for me to see that 5-6mm ID fuels lines are not a potential flow issue..
Here is the pump , before i fastened down and insulated it..
__________________
E63 Biturbo, UPD Cold Air induction kit, UPD performance crank pulley and UPD adjustable rear suspension with ride height adjustment.
CL55 UPD Cold Air Boost kit, UPD 3000 stall converter, UPD 77mm SC clutched pulley and beltwrap kit, Custom long tubes, UPD crank pulley , UPD suspension kit, UPD SC pulley, Aux. HE, Trunk tank w/rule 2000 pump, Mezeire pump, UPD 5pc idler set, Aluminum rotor hats.
www.ultimatepd.com
instagram @ultimate_pd
facebook.com/ultimatepd
E63 Biturbo, UPD Cold Air induction kit, UPD performance crank pulley and UPD adjustable rear suspension with ride height adjustment.
CL55 UPD Cold Air Boost kit, UPD 3000 stall converter, UPD 77mm SC clutched pulley and beltwrap kit, Custom long tubes, UPD crank pulley , UPD suspension kit, UPD SC pulley, Aux. HE, Trunk tank w/rule 2000 pump, Mezeire pump, UPD 5pc idler set, Aluminum rotor hats.
www.ultimatepd.com
instagram @ultimate_pd
facebook.com/ultimatepd
Super Moderator
Joined: Jul 2006
Posts: 3,365
Likes: 12
From: Orange County, CA
GMC - Miata - Trek - P-Car
Just for diagnostic purposes, have a go with the filler cap ajar.
It’s a (albeit remote) possibility that the unburned hydrocarbon recovery system is inhibiting sufficient flow.
Sure as hell has tripped me up previously - quite like a finger over the soda straw.
It’s a (albeit remote) possibility that the unburned hydrocarbon recovery system is inhibiting sufficient flow.
Sure as hell has tripped me up previously - quite like a finger over the soda straw.
Thread Starter
PLATINUM SPONSOR
Joined: Jun 2008
Posts: 3,834
Likes: 65
From: Texas
2003 CL55
gOt BoOsT the bosh 044 should be producing way more psi than that. try upgrading the fuel pressure regulator...or maybe the intank pump.
sneakyneon how much noise dose your pump make?
Here is a pic of the stock bosch 044 outlet fitting (brass color) that was removed , in place of a 5/16 barb fitting.. Any ideas how to use this fitting again or add a ball valve back to the pump?
It is 98 deg. outside and I made some hwy runs checking 02 Mv.. From 4K up, I hold a solid .945 MV.. Not a great test but very safe MV.. Timing is 19 but drops to 9 deg. when IAT`s hit 140 deg.
I also have trouble with starting after the car sits.. It seems that removing the Bosch 044 outlet fitting , eliminates the ball valve? Any ideas on adding a ball valve back, to keep pressure from bleeding off?
__________________
E63 Biturbo, UPD Cold Air induction kit, UPD performance crank pulley and UPD adjustable rear suspension with ride height adjustment.
CL55 UPD Cold Air Boost kit, UPD 3000 stall converter, UPD 77mm SC clutched pulley and beltwrap kit, Custom long tubes, UPD crank pulley , UPD suspension kit, UPD SC pulley, Aux. HE, Trunk tank w/rule 2000 pump, Mezeire pump, UPD 5pc idler set, Aluminum rotor hats.
www.ultimatepd.com
instagram @ultimate_pd
facebook.com/ultimatepd
E63 Biturbo, UPD Cold Air induction kit, UPD performance crank pulley and UPD adjustable rear suspension with ride height adjustment.
CL55 UPD Cold Air Boost kit, UPD 3000 stall converter, UPD 77mm SC clutched pulley and beltwrap kit, Custom long tubes, UPD crank pulley , UPD suspension kit, UPD SC pulley, Aux. HE, Trunk tank w/rule 2000 pump, Mezeire pump, UPD 5pc idler set, Aluminum rotor hats.
www.ultimatepd.com
instagram @ultimate_pd
facebook.com/ultimatepd
Last edited by Exotic-metal55; Jul 17, 2010 at 08:43 PM.
