very cool joe.!

i have a question.

damian, you mentioned that the in-tank pump is just a feed pump, and the pump after the surge tank is what actually pressurizes the fuel.. my question is whether both fuel pumps have to be of the same size, or if the feed pump can just be my stock pump, or a 044 or something..

 

they do not need to be the same size, BUT you must make sure the feed pump can at least out flow the pressure pump during WOT.

 

Hey Damian, trust you are well, an old thread but some great information.

I've just put a deposit on an RX7, it's going to be just an open track car (for now), it's mostly all show and not much go at the moment so some upgrade required during the winter.

One of the important jobs is fuel control and installing surge tank system, now as it's going to see street use and I'd like to have use of the trunk the tank will need to be external. I've seen a few cars listed as having surge tanks in the stock charcoal canister location which would be a great idea for me. Having looked around they are spec'd as 1 liter capacity, which doesn't sound like very much.

What volume of tank are most people here running and is there an optimum size for a specific flow rate?

Richard

 

Unless you have a full on race car with a fire wall between the fuel and pax compartment, the better alternative is one of hyperion's anti-surge thingy:

https://www.rx7club.com/vendor-classifieds-276/group-buy-fuel-anti-surge-system-fd-877845/

It is safe, cheap and easy and it works!

 

I agree this would be a worthwhile first step, unfortunately the website says "no product found" so it can't be purchased, may be they have stopped making them!

Richard

 

Hey Richard, glad to see you are part of the rx7 community now :-)
Sorry I have not connected with you yet, been crazy busy at work but I will connect with ya soon on your car.

What year is the car? the 95 tanks were made a bit better for fuel starve, so you can get away with running it to around 1/4 tank, but the earlier tanks were very bad with fuel starve with a lot of fuel still in the tank.

Here is a solution I am looking at that you may concider:
http://www.intengineering.com/Integr...17398-1-2.html

I may actually replace my surge tank setup with their 2 pump version:
http://www.intengineering.com/Integr...15581-1-2.html

We can chat more on it when I connect with you to go over your car.

 

^That is a very neat product.

Guess that will not fit through the stock sending unit hole?


John

 

not sure what you mean?

that entire unit sits out side the tank, not inside. So look at the start of the thread where I have pics, its the same setup structure, but instead of the surge tank i made, the unit above would replace it....the rest of the setup stays the same.

the stock sending stuff all stays the same, the stock pump becomes the feed pump, not the pressure pump, the pressure pump is in the surge tank.

 

"Integrated Engineering Submerged 044 Billet Surge Tank WITH PUMP"

The term submerged led me to believe it was mounted in tank.

I know your system is external to the fuel tank. That is what confused me.


John

 

ahh i see. Yeah the 'submerged' just means the pumps are submerged. That can be a benefit, as having the pumps submerged cools them better than if outside the tank.

 

That is a very cool product.. I've been wanting to design a surge tank for my FD for a while, and I like the submerged pump.

Edit: They have just the pump plate/seal for building your own tank, very cool. Would like to design something that would be bolt in..

 

Damian,

Thanks for the link, looks interesting.

The car is a 94, I won't pick it up till the end of the month, I will actually be back in St Louis next week and the week after working, so hope to make a quick trip to Columbia to see Ted.

Take care and talk to you soon.

Richard

 

could i use 044 as lift and pressure pump in a set up like this?

my plan is 044--atl swril pot---044---filter........

any suggestions is greatlty appriciated

 

^Yes, you could use an 044 as a lift pump. Not sure it would be necessary as it will be seeing very low pressures, but it will sure be reliable.

 

Ditto on the reply above, you can use a 044 as the pickup and another for the lift pump. the lift pump typically does not have to be as strong as the pressure pump but it is hard to go wrong with the 044 pump no matter what you use it for.

 

I like this set up, simple and effective, curious to know damian what changes you made to the fuel system when you changes to the 20B MOTOR.

 

Actually I may not change much, remember we are not trying to make a lot more power, so fuel consumptions needs will not really go up much. The only change I may make would really be geared towards making it more reliable fuel delivery under race conditions.

 

how loud is the pump in that location?