Happy days driving the goon. A glimmer of excitement in a sea of monotony.
Got some new JBC parts in so I replaced my hand drilled bare aluminum prototype. Bolt in adapter for B15 Sentra accel pedal assembly.
Got an exciting shipment, haven't put them on yet.
Parts in process, just a teaser photo.
As mentioned, I've been struggling with fuel starving with tank levels as low as 1/2 full.
No good, and with my track record I would rather head off the problem before it hurts the engine.
After not being able to make it through the last AutoX I couldn't ignore the problem any more.
Enter this surge tank. Not large but it's the biggest tank I could find that would fit in my planned location and not hang too low below the car. As well finding tanks designed for above mounting rather than bottom mounting (for in your trunk) was quite hard.
1L volume, can for size reference.
Any sure tank setup requires a second pump. I was originally going keep the walbro, which is extremely loud and so I assume somewhat strained, as the high pressure pump. Then get a cheap low pressure pump for tank to surge transfer, but then I rethought. If I'm going through the trouble to add reliability, adding a cheap pump doesn't make sense. Then if I'm going to buy a pricey transfer pump, why not buy a pricey high pressure pump and demote the walbro to transfer duty.
Bam, Bosch 044. About the size of a 12oz can, these get a much better job done than the Walbro.
Test fit tank in situ. Just behind the rear floor board. The floor board will provide nice protection from road debris and this spot is also right next to the front leaf mount for bottoming out protection. Only hazard is a loose driveshaft 😅
A little more driving duty.
Then I jumped on the conversion one weekend. Mind your step.
A few brackets, a bunch of line re-routing, some head scratching.
walbro picks fuel up from tank and pumps into surge tank, this then fills the surge until fuel exits through the top port and goes back to the tank return line. The oversized lower port feeds into the bosch pump which supplies the engine and the return from the fuel rail goes back into the surge tank as well. Thus even if the walbro starves out the bosch has to use all of the reserved 1L and it actually has to burn it since the return goes back to the surge.
pre-filter relocated. not good spot for this...
And a final car on the ground shot showing clearance.
I was at 2/3 full when i starved out on full throttle and high speed cornering while autoXing
Below 1/2 full I would starve out under a hard acceleration or prolonged full throttle.
Below 1/4 full I would be able to hear the pump starve with just normal jostling from stop and go traffic and lights.
I drove well below 1/8 tank and was able to hear the transfer pump cut out but had completely normal AFR's under hard acceleration ad prolonged full throttle.
as long as one of the extra bajilion connections doesn't fail...