Fuel Pumps?
Thread Starter
Cruising
Joined: Oct 2007
Posts: 13
Likes: 0
Fuel Pumps?
Looking for some help....
I have a 383, PSC1, 60 lbs injectors, BAP and a Racetronics pump. I am making 604 RWHP and fuel pressure is dropping at 6-8 lbs of boost. It is my second Racetronics pump. Any sugesstions?
I have a 383, PSC1, 60 lbs injectors, BAP and a Racetronics pump. I am making 604 RWHP and fuel pressure is dropping at 6-8 lbs of boost. It is my second Racetronics pump. Any sugesstions?
Melting Slicks
Joined: Feb 2006
Posts: 2,163
Likes: 5
From: Houston
Le Mans Master
Joined: Feb 2009
Posts: 5,169
Likes: 199
From: Your Sister's Bedroom
This is the way we went as well, great fuel hat. But I wouldnt use the pumps supplied. You can go much bigger and they are the same size and will work with the hat. We are using th Ford GT pumps that are made by walbro and rated at 430Lph each. You can get them for about $100 a piece.
Thread Starter
Cruising
Joined: Oct 2007
Posts: 13
Likes: 0
Thanks.
I did not put the pump in.
It does have the BAP.
After 6-8 months the Pressure is now dropping on hard pulls.
I have heard different stories on how much RWHP the Racetronics can produce (from 600-700Rwhp). Mine was at 604 RWHP and it seems like the pump can not make enough pressure now.
Pump gone bad or at the limit for the pump? Maybe both?
I did not put the pump in.
It does have the BAP.
After 6-8 months the Pressure is now dropping on hard pulls.
I have heard different stories on how much RWHP the Racetronics can produce (from 600-700Rwhp). Mine was at 604 RWHP and it seems like the pump can not make enough pressure now.
Pump gone bad or at the limit for the pump? Maybe both?
Le Mans Master
Joined: Feb 2009
Posts: 5,169
Likes: 199
From: Your Sister's Bedroom
Thanks.
I did not put the pump in.
It does have the BAP.
After 6-8 months the Pressure is now dropping on hard pulls.
I have heard different stories on how much RWHP the Racetronics can produce (from 600-700Rwhp). Mine was at 604 RWHP and it seems like the pump can not make enough pressure now.
Pump gone bad or at the limit for the pump? Maybe both?
I did not put the pump in.
It does have the BAP.
After 6-8 months the Pressure is now dropping on hard pulls.
I have heard different stories on how much RWHP the Racetronics can produce (from 600-700Rwhp). Mine was at 604 RWHP and it seems like the pump can not make enough pressure now.
Pump gone bad or at the limit for the pump? Maybe both?
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
Supporting Vendor
Joined: Dec 2001
Posts: 1,573
Likes: 31
From: A dealer near you.
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. Addition of a pump voltage booster may increase support to apx. 700RWHP. Cars with superchargers, turbos and low battery voltage may see lower HP support numbers.
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.
If you do have or install a FMFPR system you may still be on the edge running that HP with a FI setup.
A simple plug and play solution would be a Racetronix / Lonnie's dual in-tank system for apx. $600-$700. A DP system can support upwards of 1000RWHP!
Last edited by Racetronix; Mar 6, 2009 at 07:51 AM.
Melting Slicks
Joined: Jul 2007
Posts: 2,939
Likes: 7
From: Simpsonville SC
St. Jude Donor '09-'10
I just had to tame an MSD BAP off my 99. After trying to figure out fluctuating fuel pressures for a couple of months (since I installed the BAP), I talked with MSD support. They told me the MSD WILL NOT WORK on a returnless system, like my 99!
If you do not have a return system this is normal. From our web ad:
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. Addition of a pump voltage booster may increase support to apx. 700RWHP. Cars with superchargers, turbos and low battery voltage may see lower HP support numbers.
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.
If you do have or install a FMFPR system you may still be on the edge running that HP with a FI setup.
A simple plug and play solution would be a Racetronix / Lonnie's dual in-tank system for apx. $600-$700. A DP system can support upwards of 1000RWHP!
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. Addition of a pump voltage booster may increase support to apx. 700RWHP. Cars with superchargers, turbos and low battery voltage may see lower HP support numbers.
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.
If you do have or install a FMFPR system you may still be on the edge running that HP with a FI setup.
A simple plug and play solution would be a Racetronix / Lonnie's dual in-tank system for apx. $600-$700. A DP system can support upwards of 1000RWHP!
Supporting Vendor
Joined: Dec 2001
Posts: 1,573
Likes: 31
From: A dealer near you.
LPE uses boosters all the time as well as many of our other dealers. Perhaps MSD does not know how to solve your specific problem hence their response?
Supporting Vendor
Joined: Dec 2001
Posts: 1,573
Likes: 31
From: A dealer near you.
