The Fuel System Thread: Stock to 1000+whp
Jan 15, 2007, 07:59 PM
#61
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.
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
May 2, 2008, 08:03 AM
#64
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.
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.
May 2, 2008, 10:30 AM
#65
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.
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.
May 2, 2008, 11:13 AM
#66
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.
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.
May 2, 2008, 11:39 AM
#67
^^ 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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