R6_C5_CLS55

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

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

Best Price I Found: $219.00


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

Best Price I Found: $220.00


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

Best Price I Found: $382.78

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).

--Sean

QuickSilver2002

This verifies one thing I have seen many times. Two pumps that are the same model can flow totally different.

Does anyone know what it takes to get one of these to work in the stock bucket.

SS930

I'd also like to know. I wonder how Nick's was done?


BTW, nice research Sean!

glennd

Nice job of investigation. Just a note of advise to those people who are hearing claims of 900+ rwhp, such as those by MDMC, the pump they supplied to me is pump #1 Bosch #0 580 254 979. I purchased one before doing my research. This pump will not support any more than 730 Rwhp @ 55 PSI with 22 Volts applied to it under boost. Beware! The MSD controller can put out a max of 22 volts, however it will not return to normal operating voltage if adjusted for 22 volts out, unless you are running 30 PSI boost reference pressure to it, unlikely. The Kenne Bell Boost-a-Pump claims a 50% voltage increase, however that is if you are running 11.5 volts to it. The maximum it will put out ever, independent of input voltage is 17.5 volts.
Good Luck

onfire

I've been trying to find a flow curve for the 044 and 413 pumps all year. The 413 should be the hot ticket with OEM reliability....just wish Bosch would give the flow curves.....at the least what the 413 would flow at 80psi.

Robert56@RNS

Are these inline pumps or intank pumps?
Robert

SS930

Intank.

0EG@EnglandGreen

Great info folks. Thanks!

jbsblownc5

I run an LPE intank, that feeds my surge tank. From there, I have a Bosch inline pump that runs to the rails. I also run my KB BAP on the Bosch. I'll have to check on the exact pump, but it flows plenty of fuel for the 630 RWHP range...

I've been running the **** out of it for most of this year without a hitch. I'm boost referenced and she climbs steadily from 60 psi to around 70 psi like clockwork. It does not matter weather I have a full tank or an 1/8 of a tank of gas!
JB

Robert56@RNS

The reason I ask is I have a 580 254 984 inline that specs out to the 580 254 979. Can I use this inline with the stock Z06 pump ('02). I am converting to a return system also. Or does it need to be on it's own supply line (tee'd at tank) then tee'd back to supply. I guess I am asking can the stock system flow through, and then when n2o is activated pump comes on. I am a little confused on how it should be plumbed. I only want the extra volume when spraying (dry hit and 42lb inject). I will be around 550rwhp. Thanks for any insight/advice.
Robert

NICK YOSKIN

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well i can tell you guys from experiece the following. i have run my car @18psi and fuel is referrenced by 1.1 regulator and seeing fuel pressures of 82psi! i data logged those runs and also logged the fuel pressure as i run defi- d link fuel guage which allows data logging. fuel pressure held rock steady. i have spare bosch pump(same one in the car) at work and intrested which one it is cause its the 420 submergable version and i paid alot more the 2XX for it. kinda doubt that it is that one anyway.
BTW i am also running msd bap.

i question the if my pump is the one "referred to 420" as i am @82psi and my duty cycle is @ 90 to 95%!!!!!!!!!!!!!!!!! not sure how to convert it to flow therefor hp but i beat you its a sh*t load!
oh yeah a/r are low 11.

the weight difference between my lpe and bosch is triple


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Skunkworks

I don’t know if Bosch inline has built in check valve (discharge), most inlines do. If so, you should be able to run bypass line around inline (even if it doesn’t you can add check valve, but size appropriately). Then add check valve in bypass to prevent reverse or shortcircuiting flow. As far as turning ON fuel pump with N2O hit, I would think you should turn on pump beforehand.

Oh, on most Bosch spec sheets flow is after 20 hour break in.


Mike

sqeznbi

I tried to put a t-rex inline pump after the fuel filter and the motor rpm when idiling would fluxuate up and down. does anyone have a diagram of stock system or one with stock fuel system with an inline pump.

stevieturbo

Im pretty sure the 10 bar version of the 044 flows pretty much the same as the regular 5 bar rated pump. It just keeps its flow ability once the pressure increases.
044 flow chart
http://www.fuelsystem.co.uk/new_page_10.htm
http://www.fuelsystem.co.uk/bosch-1.pdf

Ive asked many times, and never could figure why guys in the US ay it flows 420lph, as thats almost double what Bosch claim themselves.
Even in Aus they only rate it at around 330lph, which is about 50% more than Bosch claim.

Although Bosch's flow data doesnt support the amoung of HP these pumps can actually create in real life.

These pumps are inline, they can also be used in-tank. There is also a dedicated in-tank version that is rated at slightly less, which is the "040" pump which has an open gauze bottom, same size as the pump.
Here is 2 044's installed in a custom carrier for a WRC spec Subaru



Some random text via a search
http://clam.rutgers.edu/~dreadsct/re...p/fuelpump.txt

onfire

The 420L/hr rating must be at open flow... 0psi.

Thanks for the additional info....I'm surprised at the results people are getting with a single 044 pump...the flow data doesn't back up the amount of HP it's supporting. Bosch may be real conservative on the data they release.

SS930

Nick,
Do you know the part # for the one in your car now? Why do you have a spare, were you expecting problems?

It suprises me the stock bucket doesn't run dry given it's small volume with the larger pump and increased fuel needs of hi output engines. Did they drill any holes in the bucket to increase flow through the bucket?

NICK YOSKIN

as a matter of fact i thought i did. drove to work and fuel was low and i as i was pulling in the station the car died, lost pressure. i was like "man just made it"
i filled up and all was good but 1 mile later it died again. i used test light to see if i was get 12v at the plug for the pump, i was!
got the car towed to my house threw it on my lift drained full tank of gas and pulled the pump. i popped the top of the bucket and benched tested pump all fine! apparenlty the plug for the bulkhead is hammered.
shoving a test light made the connection but not the male pin.
chris @ ls1speed is excellent to deal with and will refund all my money when he recives the new pump back.

the pump physically is much larger then lpe 225 and doesnt leave much room in the bucket but like i said it seems to work great.

stevieturbo

Nearly all Bosch pumps are approx 2.5" diameter.

SS930

Thanks Steve. I was actually refering to the pumping volume rather than its physical size... But since you mention it, if they are all 2.5" does this mean the pump is close to being a direct bolt in for the C5 bucket?

stevieturbo

Ive no idea what a Corvette bucket looks like. Sorry, cant help ya there.