FlansS14
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| posted on 9/5/07 at 01:19 PM |
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TVR chimeara Fuel pump
I have a Chimeara fuel pump, i've been told its rateed at 2.5 liters/minute at 2.5bar
will that be ok for 310bhp but running 3bar injectors.
Why didn't i just make it simple!
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BenB
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| posted on 9/5/07 at 02:05 PM |
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Well the 5L Chimera made 340Bhp so all things being equal (and assuming they didn't use a different fuel pump for that model).....
yes
There are equations out there for pump requirements for various BHPs but seeing what the donor car makes is a good indicator (unless your engine has
unusually bad efficiency)....
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ed_crouch
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| posted on 9/5/07 at 04:33 PM |
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NO. It'll stall the pump and kill it. Those pumps need fuel flowing through them for cooling, and if you stall the pump, it'll
overheat.
If the pump is rated for 2.5 bar, winding the fuel pressure reg up to 3 bar will stop the pump.
Are you sure its rated that low? I'd be surprised: my 390SE wedge runs at 3 bar quite happily on an SD1 3500 EFI pump.
Ed.
I-iii-iii-iii-ts ME!
Hurrah.
www.wings-and-wheels.net
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matt_claydon
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| posted on 9/5/07 at 05:07 PM |
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I don't think the pump is rated to 2.5 bar max pressure, it's just that the flow rate is quoted @2.5bar. Most FI pumps go way way higher
than that but flow rate reduces as pressure goes up.
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ed_crouch
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| posted on 9/5/07 at 08:55 PM |
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if you buy a 7 bar fuel pressure gauge, rig it all up, and drive the pump directly against the gauge, and see what pressure it takes to stall the
pump. This will tell you its ultimate pressure.
Dont do this for long though: it'll knacker the pump if you leave it stalled...
Putting the car on the rollers or similar in-car instrumentation will tell you whether the pump is man enough for the engine. If its not, the AFR will
go well lean at high RPM and throttle, i.e. in the higher RPM echelons of a rolling road power run.
HTH
Ed.
[Edited on 9/5/07 by ed_crouch]
I-iii-iii-iii-ts ME!
Hurrah.
www.wings-and-wheels.net
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FlansS14
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| posted on 10/5/07 at 12:57 PM |
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Thanks Edd, ill have a look into that.
ps do you work at Sindles farm.
Stuart
Why didn't i just make it simple!
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ed_crouch
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| posted on 10/5/07 at 04:08 PM |
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Nah. Engineer.
I-iii-iii-iii-ts ME!
Hurrah.
www.wings-and-wheels.net
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