Denso Fuel pump part # ?? 255lph?
AFAIK, nobody has actually published actual flow test data for a twin pump system. Buschur plans to, and AMS states that their dual pump system will support 1000HP, but I've not seen any flow testing to show the volume capacity of the twin pump setups. Some other twin pump setups on DSMs showed that two pumps DID NOT pump twice as much as a single pump system, at the same pressure, so it will be interesting to see the flow data when someone tests it in the "on the car" configuration.
Are you on the DSMLink boards, by any chance? If my memory serves me correctly, I think I recall tests on dual pump setups years ago by a few members on the board. I could search though the board, but it would be useless, since it's a private board anyway. Even if there was data, I couldn't link you to it.
Eric
The tests I saw were on NABR, but I can't link you to them. 
I'm a DSMLink member as well, and can look there. Since each of the tests were on unique pump setups, I think we'd have to test a "on car" dual pump system to really see what we had on the Evo. I've not got my dual pump system on yet, and there's 3 feet of snow here, so the Evo won't be out for a few weeks here anyway. If AMS or Buschur tests their systems, it would be great to see how their respective solutions perform in dual pump operation.
I'm a DSMLink member as well, and can look there. Since each of the tests were on unique pump setups, I think we'd have to test a "on car" dual pump system to really see what we had on the Evo. I've not got my dual pump system on yet, and there's 3 feet of snow here, so the Evo won't be out for a few weeks here anyway. If AMS or Buschur tests their systems, it would be great to see how their respective solutions perform in dual pump operation.
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Excellent info CO_VR4! Thank you 
Using the Supra TT pumps sounds like a really good idea, if it's possible. I would think with some additional modification it shouldn't be too difficult. The Supra TT pumps, in a twin in tank setup should provide enough fuel for around 750whp(dynojet) Do you agree?
I've been looking for alternatives to Walbro's without going with a huge, loud external pump. Since Full Blown and now Buschur have come up with twin in tank units, I've wanted to see about using different pumps that were more reliable and quieter. There's just some sounds I want to hear when driving a high performance car, and some sounds I dont want to hear, and a whining fuel pump is the latter.
Using the Supra TT pumps sounds like a really good idea, if it's possible. I would think with some additional modification it shouldn't be too difficult. The Supra TT pumps, in a twin in tank setup should provide enough fuel for around 750whp(dynojet) Do you agree?I've been looking for alternatives to Walbro's without going with a huge, loud external pump. Since Full Blown and now Buschur have come up with twin in tank units, I've wanted to see about using different pumps that were more reliable and quieter. There's just some sounds I want to hear when driving a high performance car, and some sounds I dont want to hear, and a whining fuel pump is the latter.
I have run the pump, although not in the car. Like most OEM Densos, it's very quiet. I expect it has the traditional Denso reliability as well. The down side is simply that, in the stock 38mm diameter configuration, it does not flow as well as the Walbro, and it costs $250 each, the same price as the Buschur modified HO Walbro.
On the other hand, if you are using a dual IN TANK configuration like Buschurs apparently is, and cutting the stock fuel pump assembly to accommodate two pumps, you might be able to use the 50mm Denso Supra Twin Turbo pump (-1020) which flows more than the stock Walbro 255 up to 75PSI (and close to it to at least 85PSI, which would be 42 pounds of boost). That should be enough for almost anyone, and that pump costs in the neighborhood of $175, is very quiet, and dead reliable, as you would expect from a Toyota OEM quality pump.
AFAIK, nobody has actually published actual flow test data for a twin pump system. Buschur plans to, and AMS states that their dual pump system will support 1000HP, but I've not seen any flow testing to show the volume capacity of the twin pump setups. Some other twin pump setups on DSMs showed that two pumps DID NOT pump twice as much as a single pump system, at the same pressure, so it will be interesting to see the flow data when someone tests it in the "on the car" configuration.
On the other hand, if you are using a dual IN TANK configuration like Buschurs apparently is, and cutting the stock fuel pump assembly to accommodate two pumps, you might be able to use the 50mm Denso Supra Twin Turbo pump (-1020) which flows more than the stock Walbro 255 up to 75PSI (and close to it to at least 85PSI, which would be 42 pounds of boost). That should be enough for almost anyone, and that pump costs in the neighborhood of $175, is very quiet, and dead reliable, as you would expect from a Toyota OEM quality pump.
AFAIK, nobody has actually published actual flow test data for a twin pump system. Buschur plans to, and AMS states that their dual pump system will support 1000HP, but I've not seen any flow testing to show the volume capacity of the twin pump setups. Some other twin pump setups on DSMs showed that two pumps DID NOT pump twice as much as a single pump system, at the same pressure, so it will be interesting to see the flow data when someone tests it in the "on the car" configuration.
eventually my question is what if you ran 1 supra tt pump in the buschur twin pump assy. would it flow more than the walbro and still be quiet?
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I'm sure if I'm mistaken, he will correct me, but this is as I understood it.
Last edited by Frenchy4g63; Jan 13, 2007 at 10:21 PM.
The other Denso pump is the 50mm TT Supra pump, often known as the 1020 The Supra Denso is fatter than the stock pump, and you'd have to modify the stock fuel assembly to fit it, as the stock pump slides into a molded plastic cylinder that is about the same 38mm diameter as the stock pump.
The AMS 1000HP kit uses a 38mm Walbro in the tank, and a fuel hose siphon and sock connected to an external Walbro pump to configure their dual pump setup. The AMS setup connects the two pumps with a "Y" nitrous fitting to the -8AN line so they run in parallel to the front of the car. The AMS system thus does not cut the 38mm cylinder housing the pump in the fuel assembly.
The Buschur dual pump setup puts two pumps in the tank, and appears to cut the fuel sender assembly to do so, attaching the pumps to the fuel sender assembly with a big hose clamp.
The Full Blown dual pump setup puts two pumps in the tank, with a custom CNC upper assembly, completely replacing the stock factory sender assembly except for transfering the fuel level sender and another part from the stock assembly, but uses an anodized aluminium lower section that is shaped to accept the pump diameters. I assume that it is approximately 38mm in diameter, cut in half.
The question that has not been answered is if there's room for a 50mm dual pump in either the Buschur or the Full Blown setups.
You could put the Supra pump intank in the Full Blown setup in a single pump configuration (or a Bosch 044 or any other pump of your choice) if Full Blown made available a custom lower housing that supported the diameter of the substitute pump.
[QUOTE=trinydex;385847 eventually my question is what if you ran 1 supra tt pump in the buschur twin pump assy. would it flow more than the walbro and still be quiet?[/QUOTE]
The Supra TT fuel pump has proven to be OEM quiet and much more reliable than the Walbro 255. You can find flow volume at pressure comparisons with a web search. In summary, they show that the Supra pump flows more than the Walbro 255 up to 65PSI, and about the same till 85PSI (stock base pressure + 40PSI boost pressure compensation). The Walbro flows a little more above that level, but very few people would care, as they don't often run more than 40 PSI of boost.
sorry to ressurect an old thread like this, but I must. I am going to do a stage 2 for my evo and a fuel pump is what's needed. Problem is everybody uses the walbro and it isn't quiet and reliable like the supra pump. Despite the work required and labor to fit the supra pump, I believe the end result is better, so who can upgrade me to the supra pump? I'm sure the tuning shops would all prefer walbro since that's all they do. Let me know because I hate unnecessary noises and whines.
This is the Denso 240 LPH fuel pump that is sold by AP Boss:
http://www.apboss.com/japanese/index...d=29&Itemid=45
It's about 1/2 way down the page.
This one is the right diameter to fit into the stock Evo fuel pump housing.
AP Boss also sells a heavy duty pump rewiring harness, which you can also see on that page.
http://www.apboss.com/japanese/index...d=29&Itemid=45
It's about 1/2 way down the page.
This one is the right diameter to fit into the stock Evo fuel pump housing.
AP Boss also sells a heavy duty pump rewiring harness, which you can also see on that page.
