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3 minute(s) of a 95 minute read
5-23-2012
5-23-2012
Adam,
I will take a closer look at my fuel set-up. Sitting in my garage, I presently have the Magnus fuel rail, AMS braided fuel lines, as well as the MAP AFPR as you stated. I have been reading a lot about fuel pumps and came across this very informative post by mrfred:
At 500 whp, the stock fuel supply line causes 16-18 psi pressure increase at the pump. add 43 psi base pressure and say 27 psi boost pressure, and total pressure at the pump is 86-88 psi. there isn't much flow from a walbro 255 at that kind of pressure. when flow rate drops off, pressure at the rail starts dropping. most people don't realize how badly fuel rail pressure is falling off because up to a point, its possible to tune around it. another interesting tidbit is that pressure increase due to the fuel line goes as the square of the flow rate, so for instance at 550 whp, the pressure increase at the pump due to the supply line is 20-22 psi, and at 600 whp, its 23-26 psi. Again, add boost pressure and base fuel rail pressure to get total pressure at the pump. 90 psi is when the flow of most fuel pumps starts dropping like a rock. a significant fuel system upgrade is a good idea for anyone planning to make 550+ whp on e85. a single pump setup like a walbro 400/460 needs either an upgraded fuel supply line or a kenne bell boost-a-pump. a double pumper can work well up to 600 whp because the custom fuel hose that comes with it replaces the most restrictive part of the factory supply line (three very restrictive sharp 90 degree connectors).
At this present time, I am leaning towards installing the Magnus fuel rail as well as the AMS braided fuel lines along with the double pumper mainly due to my track record with the DW301. I will clearly be over 500whp even on a moderate tune on the EF4 without question. I see that I can buy the Walbro 400lph for slightly less than $300 since I already have the upgraded fuel lines and aftermarket fuel rail. I have not fully read about the results of the Walbro 400lph at this time but I do know that the double pumper has been tried and true. I would vote for more is better than having just enough as it relates to my fuel set-up.
5-24-2012
Fellahs,
I sincerely need your expertise on this one. Yesterday evening I got around to putting in the Amsoil Z-Rod (20w). I drove it just a tad last night and everything was good to go. I drove it to work this morning (about ten miles) and everything was good to go. Well, during lunch, I started to notice this sound coming from the engine bay. The best way that I can describe it is that it sounds like plastic blowing in the wind. The "plastic blowing" sound gets louder and more rapid as I give the car gas. I am at a loss as to what this can be. Here is the video that I took this afternoon. What are your thoughts?
Here is the second video.
Lastly, here is a video showing what I believe to be an "abnormal" pulley. Am I being overly cautious?
Nice details
Posted by Diggymart on 10/11/20 @ 2:05:26 AM