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there isn't another drop in replacement to replace the wallbro. However the bosch can be fitted with some small modifications. best to do a search for bosch fuel pump. Got a bosch 909 fitted on my P1.
Mine wines all the time, sometimes I notice it more tha others - its done this for years. If you take the rear seats out its even louder
It doesnt seem to effect performance and the fuel pump is fine. You'd soon know about it if it was knackered!
On Track I get fuel starvation issues under a third of a tank........
Suppose I should ask, as Simon mentions the Walbro is OK upto 450 bhp.
I have a calculated 430-440 BHP based on the calc for 4 ( no. injectors ) x 850 (flow rate mm/min ) x 72% ( injector duty max ) divided by 5.5 ( mls per hp ) . TD05-20G at 1.65 bar - 1.70 bar boost. Broke the gearbox recently after 2 years of 363 bhp/325 lbft!
Is this calc about right?
It was spot on for the last turbo / injectors at 360 when measured 3 times on 2 rolling roads over 18 months at 363 bhp/325 lbft. ( 550 injectors at 91% duty, TD05 @ 24 psi )
No way it will get that power - not 'real power' but fantasy numbers
Then again I dont want to comment much more than to say at best its about 380-400 (on optimistic rollers) as I dont want it to go into a Turbo Thread
I'm going down the Bosch route as my uprated pump, although not knackered, just cant flow enough above 5500 revs, the pressure drops by .5 bar.
I've sourced the pump from Harvey () and list of bits required to fit it from Bob Rawle () but wont be fitting it till early next year as I've got to do MOT, engine mount changes etc first. The bits for fitting cost abotu £50 from Demon Tweeks, they're good in that you'll prob just need to state you're fitting a Bosch ### to a scoob and they'll send you the parts.
Yep, Walbro...its only had the whine once or twice this year and works well but the drop off from 5500 revs is now causing issues. I dont need two pumps or anything like that as I'm heading for 500 bhp, no more, so the single Bosch will do nicely. Not sure what the fitting will be like as I've never taken a pump out before but I've got a guide and pic from Bob ( ) to help me along.