Originally Posted by CO_VR4
(Post 3864555)
The Denso 38mm fuel pump sold here by AP Boss Ltd. was sent to RC Engineering and flow tested. Here are the results:
PSI ------- LBs/Hour ---------- Liters/Hour 35 399 244 40 380 232 45 (43 base pressure) 362 221 50 7 352 215 55 12 333 203 60 17 323 197 65 22 305 186 70 27 289 176 75 32 274 167 80 37 256 156 85 42 236 144 90 47 230 140 95 52 217 132 100 199 121 105 184 112 110 169 103 This is the 38mm Denso pump that fits in the stock fuel sender assembly, not the Denso Supra TT pump, which is a 50mm diameter pump. What voltage were these tests done at? Eric |
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What voltage were these tests done at? |
Originally Posted by CO_VR4
(Post 3864555)
The Denso 38mm fuel pump sold here by AP Boss Ltd. was sent to RC Engineering and flow tested. Here are the results:
PSI ------- LBs/Hour ---------- Liters/Hour 35 399 244 40 380 232 45 (43 base pressure) 362 221 50 7 352 215 55 12 333 203 60 17 323 197 65 22 305 186 70 27 289 176 75 32 274 167 80 37 256 156 85 42 236 144 90 47 230 140 95 52 217 132 100 199 121 105 184 112 110 169 103 This is the 38mm Denso pump that fits in the stock fuel sender assembly, not the Denso Supra TT pump, which is a 50mm diameter pump. |
I don't have a "site" -- I just had the Denso tested myself, for my own information. :)
At higher pressures, the Walbro does maintain higher flows than the Denso. Whether that makes a differenece in your pump selection really depends on how much boost you plan to run, since the boost determines the level of pressure that the pump has to match on a 1:1 increase. Under 30 PSI of boost, there's not much difference. It's the guys with big turbos running very high boost that need this information to make a decision about pump selection. The Denso has the advantage of being much more quiet, and OEM quality for longevity. So, if you want a quiet dependable OEM quality pump and don't boost over 30 PSI or so, the Denso will be a good option. If you want to spend quite a bit less, and have higher pressure capacity, the Walbro is in widespread use. |
Originally Posted by CO_VR4
(Post 5616948)
I don't have a "site" -- I just had the Denso tested myself, for my own information. :)
At higher pressures, the Walbro does maintain higher flows than the Denso. Whether that makes a differenece in your pump selection really depends on how much boost you plan to run, since the boost determines the level of pressure that the pump has to match on a 1:1 increase. Under 30 PSI of boost, there's not much difference. It's the guys with big turbos running very high boost that need this information to make a decision about pump selection. The Denso has the advantage of being much more quiet, and OEM quality for longevity. So, if you want a quiet dependable OEM quality pump and don't boost over 30 PSI or so, the Denso will be a good option. If you want to spend quite a bit less, and have higher pressure capacity, the Walbro is in widespread use. The flow numbers you have show it flowing quite a bit less across the entire pressure range than Walbros also tested by RCEng. For pump gas with stock to mild turbo upgrades, the Denso does make sense because its a more reliable pump. I'm in need of something that can supply sufficent flow for an E85 setup where the fuel needs are much higher, and the boost pressures run high (as high as 25 psi at 7000 prm) to take advantage of the E85. From what I've read, the Wally is the only drop-in pump that's up for the job. I do worry about the reliability issue though. I'd really like to take a look at what would be needed to fit a Supra or Skyline sized pump in there. |
^^ Because the stock fuel pump assembly is molded, the "drop-in" pump options are limited to 38mm diameter pumps. The Supra pump is an option, but the only way I know of to do it is to use a Full Blown or similar custom housing if you want to put it in the tank. Another option would be to use the in-tank pump as a feeder, and put a Denso Supra 1020 pump (or a Bosch 044) inline. The Bosch is a real performer at high pressures, flowing nearly 300 lph without a feeder at 90 PSI (check for AMS fuel pump testing results). That would keep you well fueled at the pressures and E-85 fuel you're thinking about, unless you had a larger turbo. Both the Supra 1020 and the Bosch pumps are very reliable OEM parts, as well.
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