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heliolps2 heliolps2 is offline
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Join Date: Jan 2009
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044+ MSD fuel pump voltage booster(=more fuel on top?)

Has any body tried using a MSD fuel pump voltage booster ?
pros and cons ?

It maintains fuel volume in relation to boost pressure by stepping up the supply voltage to the electric fuel pump.


The voltage boost is streetable, since it only pumps up the voltage under boost. On a side note the voltage booster only works on return line style fuel systems. It will not work on pulse modulated fuel systems.

posted by JFairman

The Bosch flow rates are conservative.
Bosch tests some 044 pumps and the ones that flow the higher rating are renamed 413 and given a higher price.

Link to Bosch PDF on the 044 and 413 pumps: http://www.bosch-motorsport.de/pdf/components/fuel_pumps/FP-200.pdf

Here's a copy of someones post on a corvette forum almost 5 years ago...

" Bosch Fuel Pump Information for High HP Applications"

--------------------------------------------------------------------------------
"I did a little research on the Bosch pumps that are being used and this is what I found out from Bosch Motorsports and one of their US distributors.

Let me first preface this by saying that pumps flow different amounts under different conditions. Typically less voltage to the pump, higher pressure, and higher temperature means less flow out of the pump. The flow numbers and max HP approximations I am reporting are the numbers Bosch supplied for the various models and I do not have information for other pressures or voltages yet. The distributor did say that the flow and HP numbers are a little conservative.

Pump #1: Bosch 0 580 254 979 ( 930 rear Pump)

This is the pump I hear referred to as the 310 LPH pump frequently.

Bosch Rating: 165 LPH at 72.5 PSI and 13.5 V

Bosch Rating: 230 LPH at 43.5 PSI and 13.5 V

Bosch Approximate Crank HP rating at 72.5 PSI and 13.5 V: 600 HP


Pump #2: Bosch 0 580 254 044

This is the pump I hear referred to as the 420 LPH pump frequently.

Bosch Rating: 200 LPH at 72.5 PSI and 13.5 V

Bosch Approximate Crank HP rating at 72.5 PSI and 13.5 V: 750 HP


Pump #3: Bosch B 261 205 413

This pump is the same pump as pump #2, but this pump is flow tested and rated at 116 PSI instead of 72.5 PSI. What Bosch does is flow some of the pumps and sort them out. This pump they will guarantee to flow its rated capacity at 116 PSI instead of 72.5 PSI. Since lower peressure generally means more flow, all else equal, I think this pump will outflow pump #2 at typical working rail pressures (60 - 80 PSI) or at least maintain a high flow rate if rail pressures above 72.5 PSI are required in high boost / high HP applications.

Bosch Rating: 200 LPH at 116 PSI and 13.5 V

Bosch Approximate Crank HP rating at 116 PSI and 13.5 V: 750 HP

A side note on pump #3 is that it is only available from a Bosch Motorsports dealer, which is different than a regular shop that sells Bosch products.

Obviously at lower pressures the pumps will flow more volume. Also, with the addition of a voltage booster, the pumps will flow more volume. Therefore, it is apparant that the pumps can support more power than the Bosch Motorsports representative indicated given more favorable conditions (less pressure and more voltage)."

The question to you will the MSD fuel pump booster helps us 930 CIS turbo guys that are getting too lean at high rpm's ?

Maybe Chris from TurboKraft can weigh in.
__________________
1986 944 turbo -first car
1997 993 Cab 6 speed-sold
1992 964 C2 turbo
SOLD, 911GT ,CIS, 428 fwhp 450 trq, Carrillo rods, 964 cams, TT retainers,7.5 comp 1.1 bar boost 320 ml black fuel head 009 injectors, 044 pumps, 60-1 T4/T3 dual scroll turbo

Last edited by heliolps2; 11-22-2011 at 06:15 PM..
Old 11-22-2011, 05:54 PM
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