Major modifications MUST be made to the in tank housing (I.E.,complete removal of fuel filter assy,yes it is part of the assembly)and the connector that attaches to the fuel pump must be cut off and eye connectors installed as the Supra TT pump has the wires attach via nuts,not a plug connector.The Supra TT pump is aprox 50% larger in Diameter so it physically will not fit in stock,un-modified housing.I have done this and may be offering it as an less expensive option than some of the vendors dual pump set-ups,just want to see how well it will work on a 600+whp evo sporting a GT-35r
AMS turbo kit (thanks Dan B. )before I offer it to others(I like to R+D before offering it as I know that there is a big demand for such,but profit does not come 1st for me as I know quite a few others on here it does)I need to be completely positive that this will work up to 700WHP before offering it to others.BTW,the Supra TT pump
aka Denso 1020 can be purchased alone for aprox $210.00 +/- $20,but remember,this is NOT a Plug and Play pump by any means.Also,the denso is as quiet as stock and lots of aftermarket fuel pumps are compared TO it and works quite well for modified Supras.

 

how much lph does the Denso 1020 flow?

 

That all depends on the amout of VOLTAGE that is available at the pump as it is not constant,that is why rewiring and adding larger gauge wires to power fuel pump help out tremendously(via a relay) If you do a MSN or Yahoo "search" on Supra TT or Denso 1020 fuel pump you will find alot of info and flow charts can be had on them.
I spent aprox 16 hours searching/reading up on them before I ever even decided to undertake this route.

 

turbodan,

do you have any info on DB's modified walboro fuel pump?

 

My off-the-cuff calculations reveal installing two pumps in series increases overall capacity by an estimated ~20%. Keep in mind that the greater the pressure demand on the pump, the less the flow volume the pump can maintain. The pressure demand equals the outlet pressure minus the inlet pressure. By installing two pumps in series, this reduces the pressure differential that each pump must maintain by 50%. The reduction in pressure demands on each pump increases the overall flow rate for each pump.

 

Assuming Teds calculations are about right (they seem conservative to me, which I appreciate) that means my setup should be fine for around 635whp/565wtq on a Dynojet. What that means to me is that I won't ever outpace my current fuel system as I have no desire to push my setup past 600whp/535wtq.

BTW, several folks have been pm'ing me to ask how exactly I set up my second inline Walbro pump. Stay tuned for photos and/or explanations.

 

The twin Walbro 255s set up in series is the same pump setup supplied in the AMS "1000HP fuel system". Maybe they calculate more liberally. Certainly the use of the larger lines and less restrictive rail would be beneficial in reducing resistance, but still the pumps themselves are the same.

 

Am also running a Walbro 255 intank together with an external type Walbro 255 just after the fuel filter and before the fuel rail. Cars making 612WHP 545WTQ at 32 psi on 1000 cc injectors. Fuel pressure is a rock steady 45 psi at idle and does not drop off at 77 psi on boost. No problems whatsoever. The single in tank Walbro ran out of fuel at 550 WHP at 25 psi. This is of course on a stroked 2.3 litre motor running a GT35R.

 

That is the best way to do it imho. Use a Y block of course. I believe this is exactly how the AMS fuel system is setup.

 

just let us know where you post the pictures

 

do you think a twin pump setup would be necessary for a 2.3 stroker with a 20g?

 

No.

 

Absolutely not.

 

The limitation on HP for that setup is the 20g. You only need uprated pumps when you have a turbo that can flow enough air to require more fuel than a single pump can provide. There are not many 20g powered cars over 450 HP

 

turbodan got updates for us on that supra pump and housing mod install gig?