MSD boost-a-pump
04-02-2007, 03:56 PM
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MSD boost-a-pump This is an upgrade, along with a bigger fuel pump for a turbo kit I was reading about, can't remember exactly where right now. It increases fuel pressure along with boost. Can't this be done by tuning? How is this necessary or adventageous over tuning?
04-02-2007, 04:12 PM
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i am not sure what you are asking but i do believe that in order to have fuel pressure increase along with boost pressures most guys are running boost referenced fuel pressure regulators. most of the info that i see about "boost a pumps" are that they increase the actual voltage going to the fuel pump and in turn increase its output.
hope this helps.
Louie
hope this helps.
Louie
04-02-2007, 04:14 PM
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MSD bap bumps up the voltage to the fuel pump so it can maintane fuel pressure and volume. your motor needs both pressure and volume to prevent a lean condition, which can be bad thing.
04-02-2007, 07:32 PM
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In the case of an EFI system pressure maintenence = volume.
Voltage boosters make the pumps spin faster which moves more fuel. Maintaining a set fuel pressure requires a minimum volume depending on the demand from the engine. This is why seeing a pressure drop under load is a sign of low volume.
With most pumps an increase of 1 volt to the pump will increase available volume by about 10%.
Voltage boosters make the pumps spin faster which moves more fuel. Maintaining a set fuel pressure requires a minimum volume depending on the demand from the engine. This is why seeing a pressure drop under load is a sign of low volume.
With most pumps an increase of 1 volt to the pump will increase available volume by about 10%.
04-03-2007, 11:35 AM
#7
This is from Racetronix website. Bob
Technical note:
The Racetronix fuel pump in this system is capable of supporting apx. 600RWHP @ 0.5 BSFC @ 58PSI (400KPa) using factory lines. In early model C5's with rail-mounted fuel pressure regulators the above HP support can be achieved.
If a pump voltage booster is added 700RWHP+ can easily be supported. (at this HP level modified fuel rails should be used to prevent deadheading)
Late model C5's with the returnless rail system will not be able to achieve this level of HP support with the fuel system alone.
This is because the point of regulation is at the back of the car. The location of the FPR does not allow it compensate for line
pressure drop even though the pressure is stable at the back (regulator location). There are two options to get around this problem.
First is to convert the system to a rail mounted FRP return type (best). The second option is to install a pump booster which is
activated at the point where rail pressure starts to drop. The boost in fuel volume overwhelms the regulator / return line thereby
increasing the fuel pressure at the back of the car which translates to higher pressure at the rail. We recommend the MSD unit for
FI applications as it ramps the voltage based on manifold pressure. This prevents a short but abrupt fuel pressure spike which
causes the motor to hiccup from brief over-fueling. If you are using an instant-on N2O system then the KB BAP can be considered as well.
Please understand that this is not an issue with the Racetronix system but rather a design limitation of the factory configuration.
Racetronix is working on a plug & play solution to address these problems as well as the new 2003 C5 module. No ETA is available at this time on these solutions / components.
2003 C5 Corvettes can be checked for compatibility with the Racetronix fuel system. If your access port for the fuel module can be seen in front of the driver's side rear tire (under the car) then this system will work. If it is not visible then you have the new type of module which goes in from the top of the tank. The Racetronix system is not compatible with this fuel module / system. If you are not sure please have a qualified person check before ordering your system.
Alternator-direct power for maximum voltage / True PnP with GM type connectors:
The 2003+ C5 Corvette is equipped with a top-loaded fuel module which contains a Walbro vane-type fuel pump. This module has an integrated fuel pressure regulator and fuel filter. The Walbro vane pump used in this new module flows less fuel than the Walbro gerotor pump used in previous model C5's. Having the regulator located in the module moves the point of regulation farther away from the fuel rail. This reduces the fuel pressure stability at the rail even further. Racetronix will be releasing a fuel pump upgrade for this application however removing the fuel module is a major job in this case. The exhaust system and transaxle must be dropped in order to remove the DS fuel tank which contains the fuel module. The module itself is very difficult to re & re from the tank. For these reasons most C5 owners who have this system will chose to use external devices to boost fuel pump performance. This is where the Racetronix fuel pump upgrade harness comes into play. The Racetronix PnP upgrade harness provides alternator-direct power for maximum pump voltage. Racetronix has documented an average 1.0-1.2V increase in pump supply voltage on the 2003+ C5. This equates to a 10-15% increase in pump volume. A minor increase in fuel pressure will actually be experienced with the installation of this harness. The harness is fully 'plug & play' so it is installed without cutting into the factory wiring. The entire harness is waterproof made with the same Delphi interconnect components used throughout your C5. The harness' operation is quite simple. The factory power wire which was once used to supply the fuel pump is used to trigger a 40 amp-rated mil. spec. relay which in turn supplies power directly from the car's alternator with fused protection. The harness is ultra-reliable which is why Racetronix provides a lifetime warranty on parts and labor. All connections are crimped and soldered unlike the factory where they are only crimped. All wiring is protected by high-temperature-rated Nylon looming.
Redundant grounds = improved voltage & reliability:
A redundant ground is provided which loops into the harness. This loop enhances the pump's ground providing a two-fold
improvement.
Pump booster PnP ready:
Most people installing supercharger, turbo or nitrous oxide systems in a 2003+ C5 will chose to use a fuel pump booster / voltage amplifier (KB BAP or MSD) which can increase vane pump performance upwards of 50%. Up until now people installing a booster would have to cut into the factory wiring harness which for many reasons is not a very good approach. This is no longer required with the Racetronix harness as it is equipped with an intermediate high-current (30 amp) connector just after the relay. This allows for easy plug & play addition of a pump voltage booster. The Racetronix harness removes the increased load off of the factory wiring created by the booster's amplification process. The Racetronix harness only supplies power to the pump booster when the vehicle computer commands fuel pump operation so there will be no parasitic load on your battery when engine is not running. The Racetronix harness allows the booster to be removed easily should the need arise. The booster is easily mounted inside the open area behind the driver's side rear wheel well covering where these is plenty of room, good ventilation and minimal exposure to the elements. This area is easily accessible and prevents the booster's installation from adding to underhood clutter. A connector assembly set is included so that any booster can be adapted to plug into the Racetronix harness. The Racetronix harness further enhances the pump booster's performance by eliminating the factory wiring's voltage drop which would require more voltage amplification as compensation. The heavy 10 gauge power feed is rated at 30 amps (relay 40 amps) which is more than capable of handling the 15+ amp load generated by the booster and pump at elevated voltages. The best part is that the Racetronix harness is so easy to install that the labor savings will usually pay for the harness itself when compared to hardwiring a permanent solution from scratch.
Hardware included:
Plenty of wire ties are included as well as a SS mounting hardware for the fuse holder, spare 20A ATC fuse and silicon grease to prevent corrosion and lubricate the chassis-mounted ground leads .
Technical note:
The Racetronix fuel pump in this system is capable of supporting apx. 600RWHP @ 0.5 BSFC @ 58PSI (400KPa) using factory lines. In early model C5's with rail-mounted fuel pressure regulators the above HP support can be achieved.
If a pump voltage booster is added 700RWHP+ can easily be supported. (at this HP level modified fuel rails should be used to prevent deadheading)
Late model C5's with the returnless rail system will not be able to achieve this level of HP support with the fuel system alone.
This is because the point of regulation is at the back of the car. The location of the FPR does not allow it compensate for line
pressure drop even though the pressure is stable at the back (regulator location). There are two options to get around this problem.
First is to convert the system to a rail mounted FRP return type (best). The second option is to install a pump booster which is
activated at the point where rail pressure starts to drop. The boost in fuel volume overwhelms the regulator / return line thereby
increasing the fuel pressure at the back of the car which translates to higher pressure at the rail. We recommend the MSD unit for
FI applications as it ramps the voltage based on manifold pressure. This prevents a short but abrupt fuel pressure spike which
causes the motor to hiccup from brief over-fueling. If you are using an instant-on N2O system then the KB BAP can be considered as well.
Please understand that this is not an issue with the Racetronix system but rather a design limitation of the factory configuration.
Racetronix is working on a plug & play solution to address these problems as well as the new 2003 C5 module. No ETA is available at this time on these solutions / components.
2003 C5 Corvettes can be checked for compatibility with the Racetronix fuel system. If your access port for the fuel module can be seen in front of the driver's side rear tire (under the car) then this system will work. If it is not visible then you have the new type of module which goes in from the top of the tank. The Racetronix system is not compatible with this fuel module / system. If you are not sure please have a qualified person check before ordering your system.
Alternator-direct power for maximum voltage / True PnP with GM type connectors:
The 2003+ C5 Corvette is equipped with a top-loaded fuel module which contains a Walbro vane-type fuel pump. This module has an integrated fuel pressure regulator and fuel filter. The Walbro vane pump used in this new module flows less fuel than the Walbro gerotor pump used in previous model C5's. Having the regulator located in the module moves the point of regulation farther away from the fuel rail. This reduces the fuel pressure stability at the rail even further. Racetronix will be releasing a fuel pump upgrade for this application however removing the fuel module is a major job in this case. The exhaust system and transaxle must be dropped in order to remove the DS fuel tank which contains the fuel module. The module itself is very difficult to re & re from the tank. For these reasons most C5 owners who have this system will chose to use external devices to boost fuel pump performance. This is where the Racetronix fuel pump upgrade harness comes into play. The Racetronix PnP upgrade harness provides alternator-direct power for maximum pump voltage. Racetronix has documented an average 1.0-1.2V increase in pump supply voltage on the 2003+ C5. This equates to a 10-15% increase in pump volume. A minor increase in fuel pressure will actually be experienced with the installation of this harness. The harness is fully 'plug & play' so it is installed without cutting into the factory wiring. The entire harness is waterproof made with the same Delphi interconnect components used throughout your C5. The harness' operation is quite simple. The factory power wire which was once used to supply the fuel pump is used to trigger a 40 amp-rated mil. spec. relay which in turn supplies power directly from the car's alternator with fused protection. The harness is ultra-reliable which is why Racetronix provides a lifetime warranty on parts and labor. All connections are crimped and soldered unlike the factory where they are only crimped. All wiring is protected by high-temperature-rated Nylon looming.
Redundant grounds = improved voltage & reliability:
A redundant ground is provided which loops into the harness. This loop enhances the pump's ground providing a two-fold
improvement.
Pump booster PnP ready:
Most people installing supercharger, turbo or nitrous oxide systems in a 2003+ C5 will chose to use a fuel pump booster / voltage amplifier (KB BAP or MSD) which can increase vane pump performance upwards of 50%. Up until now people installing a booster would have to cut into the factory wiring harness which for many reasons is not a very good approach. This is no longer required with the Racetronix harness as it is equipped with an intermediate high-current (30 amp) connector just after the relay. This allows for easy plug & play addition of a pump voltage booster. The Racetronix harness removes the increased load off of the factory wiring created by the booster's amplification process. The Racetronix harness only supplies power to the pump booster when the vehicle computer commands fuel pump operation so there will be no parasitic load on your battery when engine is not running. The Racetronix harness allows the booster to be removed easily should the need arise. The booster is easily mounted inside the open area behind the driver's side rear wheel well covering where these is plenty of room, good ventilation and minimal exposure to the elements. This area is easily accessible and prevents the booster's installation from adding to underhood clutter. A connector assembly set is included so that any booster can be adapted to plug into the Racetronix harness. The Racetronix harness further enhances the pump booster's performance by eliminating the factory wiring's voltage drop which would require more voltage amplification as compensation. The heavy 10 gauge power feed is rated at 30 amps (relay 40 amps) which is more than capable of handling the 15+ amp load generated by the booster and pump at elevated voltages. The best part is that the Racetronix harness is so easy to install that the labor savings will usually pay for the harness itself when compared to hardwiring a permanent solution from scratch.
Hardware included:
Plenty of wire ties are included as well as a SS mounting hardware for the fuse holder, spare 20A ATC fuse and silicon grease to prevent corrosion and lubricate the chassis-mounted ground leads .
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04-03-2007, 11:49 AM
#8
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I guess what I'm asking is: won't the fuel pump increase volume based on MAF readings? The MAF will read way more air and the fuel pump should respond accordingly. More boost, more fuel pressure, right?
