Kyosan pumps
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6600 rpm clutch dump of death Administrator
Joined: Dec 2001
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From: Texas
Kyosan pumps I had found an old thread on Corvette Forum about a reworked Toyota pump from a company called Kyonsan. I was wondering if anyone had every heard of them, or if anyone was using the Toyota/DEnso pumps, or a Denso / Kyosan pumps. It sounds like the Denso pump might be a better option since it is an OE pump over a Walboro, but I just wanted to see if anyone had used them.
http://forums.corvetteforum.com/c5-f...lph-40psi.html
http://forums.corvetteforum.com/c5-f...00-1500hp.html
The stock toyota twin turbo supra 93-98 has a denso 195130-1020 pump. This pump flows 290lph on 14 volts. Yes... much more than the walbro 255, supporting over 500wheel horse power, on one in tank pump. The pump pumps more fuel at more voltages and a wider range of rail pressure psi's than any other stock pump I have been able to find. It gets better...
This pump has gone up against every other in tank pump in many magazine shootouts, and not only does it flow more than most, but it IS the most RELIABLE!... the magazine tests show how overspinning a pump can lead to almost instant failure with the walbro 255, but not with the denso pump.
btw, there are many denso pumps, for all toyotas, so when doing your research, stay on the part number described above 195130-1020, and it also goes by 195130-1270.
But.. it gets better...
HKS got their hands on the denso supra pump, and re worked it. While it doesn't show any big advantages over the stock supra pump at 12 and 14volts, it runs away to 340lph at 16v @43psi rail pressure. Yeah... thats right... and magazines have tested it as well, and it is still relaible, and can be overspun without failure like our little walbros, which is why it retails for over 800 dollars hks part number 1407-001US
and it gets better... Kyosan is a japanese company as well, who took the denso, re-worked it, and they came up with the kyosan 895091-0810. Same size, same outer casing, inlet and outlet, but 390lph at 14v at 43psi. That wasn't a typo... and i know several people who have been running these pumps on daily driver cars for over 2 years, with fuel return systems, at a constant 45psi, and 14 volts. AND I have had 3 of these pumps sent to 3 different fuel flow testing facilities, and all came back with the big 390lph number, and ALL 3 companies called me out of curiosity to inquire where i got the pump, and what it is.
our vettes run at like 13.7 volts with the alternators going, and a kenne belle boostapump box can take us well over 16 volts.
More kyosan stats:
10psi 510lph 7.7amps 14v
20psi 470lph 8.3amps 14v
30psi 430lph 8.9amps 14v
40psi 390lph 9.5amps 14v
50psi 350lph 10.5amps 14v
60psi 305lph 11.5amps 14v
70psi 258lph 12.5amps 14v
80psi 200lph 13.5amps 14v
90psi 140lph 14.2amps 14v
30psi 320lph 7.3amps 12v
40psi 273lph 8.3amps 12v
50psi 225lph 9.3amps 12v
60psi 180lph 10.4amps 12v
40psi 120lph 7.1amps 9v
i got all the 9v numbers, but who cares, our batteries hold 12, so even if your alternator fails, your still in ok shape.
My vette builder at has figured out how to modify the stock in tank pump carrier setup on my 02 z06, and a 2003 frc to accept either 1, or 2 of ANY of the pumps described above since they all have the same outer casing, and we have been able to feed more fuel to the motor than a lingenfelter c5r 427 750tt package could come close to drinking, and we are now making 800+hp to the wheels after the retune with enough fuel, bigger injectors, rails, and lines. The reason is it would take 4, four... (4) walbro 255's to compete with the fuel system we have. 4 pumps. Try getting the stock carrier to hold that... No thanks,
A single kyosan will support OVER 800hp forced induction to the wheels without a problem. Dual stock denso supra tt pumps will support OVER 1000rwhp on fi motors with high rail pressures. On my 02 z06, we are running 1000cc (96lb) low impedance injectors, and the pumps can OUTFLOW the injectors by 30-40% at 100% duty cycle!... you can do the math for yourself if you understand all the formulas.
Best of all... the cost. The stock denso pumps retail for about 400 bucks.
he hks sells for over 800 retail. part number 1407-001US
And the kyosan's... 390lph @ 43psi and 14v in tank pump... designed for an industrial feed tank on large equipment over in japan. retailed for over 1000 dollars, the few that actually made it to the states.
http://forums.corvetteforum.com/c5-f...lph-40psi.html
http://forums.corvetteforum.com/c5-f...00-1500hp.html
Originally Posted by irun4cops
The stock toyota twin turbo supra 93-98 has a denso 195130-1020 pump. This pump flows 290lph on 14 volts. Yes... much more than the walbro 255, supporting over 500wheel horse power, on one in tank pump. The pump pumps more fuel at more voltages and a wider range of rail pressure psi's than any other stock pump I have been able to find. It gets better...
This pump has gone up against every other in tank pump in many magazine shootouts, and not only does it flow more than most, but it IS the most RELIABLE!... the magazine tests show how overspinning a pump can lead to almost instant failure with the walbro 255, but not with the denso pump.
btw, there are many denso pumps, for all toyotas, so when doing your research, stay on the part number described above 195130-1020, and it also goes by 195130-1270.
But.. it gets better...
HKS got their hands on the denso supra pump, and re worked it. While it doesn't show any big advantages over the stock supra pump at 12 and 14volts, it runs away to 340lph at 16v @43psi rail pressure. Yeah... thats right... and magazines have tested it as well, and it is still relaible, and can be overspun without failure like our little walbros, which is why it retails for over 800 dollars hks part number 1407-001US
and it gets better... Kyosan is a japanese company as well, who took the denso, re-worked it, and they came up with the kyosan 895091-0810. Same size, same outer casing, inlet and outlet, but 390lph at 14v at 43psi. That wasn't a typo... and i know several people who have been running these pumps on daily driver cars for over 2 years, with fuel return systems, at a constant 45psi, and 14 volts. AND I have had 3 of these pumps sent to 3 different fuel flow testing facilities, and all came back with the big 390lph number, and ALL 3 companies called me out of curiosity to inquire where i got the pump, and what it is.
our vettes run at like 13.7 volts with the alternators going, and a kenne belle boostapump box can take us well over 16 volts.
More kyosan stats:
10psi 510lph 7.7amps 14v
20psi 470lph 8.3amps 14v
30psi 430lph 8.9amps 14v
40psi 390lph 9.5amps 14v
50psi 350lph 10.5amps 14v
60psi 305lph 11.5amps 14v
70psi 258lph 12.5amps 14v
80psi 200lph 13.5amps 14v
90psi 140lph 14.2amps 14v
30psi 320lph 7.3amps 12v
40psi 273lph 8.3amps 12v
50psi 225lph 9.3amps 12v
60psi 180lph 10.4amps 12v
40psi 120lph 7.1amps 9v
i got all the 9v numbers, but who cares, our batteries hold 12, so even if your alternator fails, your still in ok shape.
My vette builder at has figured out how to modify the stock in tank pump carrier setup on my 02 z06, and a 2003 frc to accept either 1, or 2 of ANY of the pumps described above since they all have the same outer casing, and we have been able to feed more fuel to the motor than a lingenfelter c5r 427 750tt package could come close to drinking, and we are now making 800+hp to the wheels after the retune with enough fuel, bigger injectors, rails, and lines. The reason is it would take 4, four... (4) walbro 255's to compete with the fuel system we have. 4 pumps. Try getting the stock carrier to hold that... No thanks,
A single kyosan will support OVER 800hp forced induction to the wheels without a problem. Dual stock denso supra tt pumps will support OVER 1000rwhp on fi motors with high rail pressures. On my 02 z06, we are running 1000cc (96lb) low impedance injectors, and the pumps can OUTFLOW the injectors by 30-40% at 100% duty cycle!... you can do the math for yourself if you understand all the formulas.
Best of all... the cost. The stock denso pumps retail for about 400 bucks.
he hks sells for over 800 retail. part number 1407-001US
And the kyosan's... 390lph @ 43psi and 14v in tank pump... designed for an industrial feed tank on large equipment over in japan. retailed for over 1000 dollars, the few that actually made it to the states.
Thread Starter
6600 rpm clutch dump of death Administrator
Joined: Dec 2001
Posts: 4,983
Likes: 13
From: Texas
Ok, I was looking around on the Turbo Buick site and found a post on this by Racetronix. Apparently Racetronix carries Kyosan pumps, and has stated some of the information on CF is according to Kyosan "innaccurate".
http://www.turbobuick.com/forums/gen...stalled-9.html
Anyway, still looking for input on whether anyone has used either unit.
http://www.turbobuick.com/forums/gen...stalled-9.html
Anyway, still looking for input on whether anyone has used either unit.
Here is an interesting link with some fuel pump comparisons http://realstreetperformance.com/sto...on-test-5.html
Thread Starter
6600 rpm clutch dump of death Administrator
Joined: Dec 2001
Posts: 4,983
Likes: 13
From: Texas
So, did some more digging. Apparently someone had a friend at Aeromotive test one of these pumps.
http://www.3si.org/forum/f1/kyosan-f...ctures-510579/
Apparently it did not test as well as its advertised numbers.
Another thread on Supraforums about it.
http://www.supraforums.com/forum/sho...n-390lph-40psi
What I take from it is that the OEM Supra pump is a good pump up to about 800 HP. The Kyosan modified pump has significant flow drop as pressure goes up. So, as a boost referenced pump I don't think it would keep up. In a N/A application, it might be fine.
From 30 psi to 90psi the Kyosan volume rate drops 290 liters. From 29psi to 87psi., the HKS volume rate drops only 49 liters.
The ratings to be most concerned with, is the volume of fuel at high pressures(60-90psi). At 14 volts the Kyosan appears the perform well, but it actually pushes it’s true capabilities out of it’s own range. It’s not a high pressure pump.
Kyosan vs. HKS (bosch)
10psi 510lph 7.7amps 14v
20psi 470lph 8.3amps 14v
30psi 430lph 8.9amps 14v - 29psi 249lph 13v
40psi 390lph 9.5amps 14v - 43psi 237lph 13v
50psi 350lph 10.5amps 14v
60psi 305lph 11.5amps 14v - 58psi 225lph 13v
70psi 258lph 12.5amps 14v - 72psi 212lph 13v
80psi 200lph 13.5amps 14v
90psi 140lph 14.2amps 14v - 87psi 200lph 13v
Here is a prety good test that was done on some of the pumps out there to give good idea about how some of the pumps stacks up. Lots of good info.
http://www.stealth316.com/2-fuelpumpguide.htm
http://www.3si.org/forum/f1/kyosan-f...ctures-510579/
Apparently it did not test as well as its advertised numbers.
Another thread on Supraforums about it.
http://www.supraforums.com/forum/sho...n-390lph-40psi
What I take from it is that the OEM Supra pump is a good pump up to about 800 HP. The Kyosan modified pump has significant flow drop as pressure goes up. So, as a boost referenced pump I don't think it would keep up. In a N/A application, it might be fine.
From 30 psi to 90psi the Kyosan volume rate drops 290 liters. From 29psi to 87psi., the HKS volume rate drops only 49 liters.
The ratings to be most concerned with, is the volume of fuel at high pressures(60-90psi). At 14 volts the Kyosan appears the perform well, but it actually pushes it’s true capabilities out of it’s own range. It’s not a high pressure pump.
Kyosan vs. HKS (bosch)
10psi 510lph 7.7amps 14v
20psi 470lph 8.3amps 14v
30psi 430lph 8.9amps 14v - 29psi 249lph 13v
40psi 390lph 9.5amps 14v - 43psi 237lph 13v
50psi 350lph 10.5amps 14v
60psi 305lph 11.5amps 14v - 58psi 225lph 13v
70psi 258lph 12.5amps 14v - 72psi 212lph 13v
80psi 200lph 13.5amps 14v
90psi 140lph 14.2amps 14v - 87psi 200lph 13v
Here is a prety good test that was done on some of the pumps out there to give good idea about how some of the pumps stacks up. Lots of good info.
http://www.stealth316.com/2-fuelpumpguide.htm
Before I bought my triple 255 walbro setup I was searching around for pumps that would be the best blend of performance, budget, and reliability. I found that CF link multiples times about the Kyosan pumps. I'm glad you were able to dig up more information on them.
Another thing to note, the Denso/Kyosan pumps are quite a bit bigger than the OE pumps in the later model GMs and the aftermarket high flow pumps like our DW301. And our DW301 flows better throughout the pressure range, too.
The Denso/Kyosan is about 50mm in diameter vs. the 38-39mm of the OE and aftermarket.
The Denso/Kyosan is about 50mm in diameter vs. the 38-39mm of the OE and aftermarket.
