Fuel Pumps

[Mad_Trbo]

I am looking into my fuel situatio and with the current upgrades I have on the way will need to upgrade the fuel pump. Have any of you tried utilzing a Supra Fuel pump?

I am working with cotton's and the recommendation is a double pumper at an astonishing half a c- note. Kind of expensive and possibly over kill.

Looking @ around 700 - 750 hp, now on my Eclipse the Supra pump with a hardwire the can handle this.

Please advise on the many paths taken with regard to fuel pumps for this ride, looking for internal upgrade only!

 

[Nick Micale]

Go back to work with Cotton for parts and advise on your turbo Buick. The ricer board is fine for info about your Eclipse pump, but does not apply here.

 

[Mad_Trbo]

Interesting I figured GPH is GPH regardless of the application.

There are a couple of Walbro pumps claimed to be capable of mid 11's, anybody care to chime in on their success in using one of these?

Realizing fuel is not an area to scrimp on, but the double pumper just seems like over kill.

 

[Fuelie600]

Jack won't steer you wrong. $500 fuel system is only the beginning. If 700-750hp was affordable, everyone would be in the 9's. Brian

 

[87GN_70GS]

From an earlier post:

"I had the 340 and the Denso 195130-1020 transposed, with is a much cheaper ($180 vs $400) alternative to the A'PEXi 404-A011 and (meant to say) outflows the 340 under certain conditions. The 195130-1020 is a Supra TT pump and is not in the stock GN configuration. However, at 13.5v, the Denso does outflow the 340 below 65 psi. Above 65 psi, it's the opposite story, which says to me that with a mod to the pressure relief of the -1020, you might have more flow than the 340. You still have the problem of if not just dropping into the stock hanger. Here's a link to a lot of fuel pump flow curves: http://www.stealth316.com/2-fuelpumpguide.htm "

 

[GNVYUS 1]

The Supra TT pump is a great pump, but it just does not work with our set up and its more expensive than the 340 which is pretty close in flow.

If you are looking for 700hp, thats probably a 800lb TQ GN and a double pumper is not going to be overkill, its going to be nessasary so that your motor is not killed.

One pump is not going to be enough for a 3500lb GN pushing all that TQ, the imports can get away with it due to less weight and much less TQ.
Cottons got you going in the right direction like he always does, stick with what that guy says even if you are shelling out $500 for a fuel system.

 

[Mad_Trbo]

Cotton hasn't led me astray yet, so it is agreed that I will follow his advice. But I think what I will do is use the Supra pump I have make a few modifcations to the hanger and lower my expectation.

In an earlier post someone states the mass of the car will basically help in determining what kind of pump you will need. I don't necessarily agree with this. Torque and horsepower and fuel requirements aren't dependent on weight. A 650 - 750 hp engine in a 3500 lb car will have the same fuel reqruirements as that same horsepower motor sitting on an engine dyno. I need to do the math, to determine the requirements. Excellent link in the upper portion of the thread talking to different pumps.

 

[Mike Licht]

The current production GSS340 and F2000169 Walbo pumps outflow the Supra TT pump by a small margin at high (65+) pressures as is. If you already have a Supra you can use it but expect no better than low 11's
Mike

 

[V6 Beast]

I don't know what fuel pressure or pump the Supras use but in a Buick there are two things to consider. Flow and Fuel Pressure. You have to make sure that you have enough flow at the fuel pressure you are going to be running. It isn't just horsepower. The problem with a single pumps is the flow rates drop off at higher pressures. Many of them have plenty of flow below 50-60 PSI. But when you start with 43 PSI fuel pressure and add 25 psi boost, then your pump needs to be able support the flow for the HP level at 68 PSI. If you run 30 psi boost and then it needs to flow the required GPH at 73 PSI.

When I had a single pump, I could run 25 psi boost and the car ran very high 10's. If I tried to turn the starting pressure up so it would have more fuel so i could run more boost, it actually got leaner because the pump was unable to keep up with flow at higher pressure.

If your 700-750 HP 4 cyclinder eclipse isn't adding additional fuel pressure for boost then it may be possible for it to supply enough fuel at a low pressure.

Bottom line.. listen to what Jack is telling you because he knows what he is talking about.

Sully