hey

is it safe or a good idea to run a Supra TT pump and a stock FD as a dual combination for dual pump or should i go with dual supra pumps only ( i have one now but i was thinking about putting the FD's stock one back in as a combo package )

 

my dual setup has 2 FD pumps... which are 255s ... makin a total of 510lph ! Think thats quite enough for a whole lot of power ... and i got my second pump for 99 p of ebay ...

I WOULD NOT install 2 different pumps on the same circuit... i think if one flows more than the other it will break the smaller pumps flow down !? ... as you have more flow coming from one pump than from the other... not sure if my theorie is right ^^... i i were you id install the suprapump and keep my eyes open for another supra pump! ...

 

thanks!

 

I'm also running dual FD pumps. I have a thread writeup on here somewhere about it. I've heard of people running 2 different pumps, not sure if there is any downside to it.

There is also more then one way to run dual pumps. You can use a Y block in the tank and run it same as stock after that. Or you can use the return line as a second line and run 1 pump per rail.

IE: Supra pump to secondary rail, FD pump to primary rail, then use the line from the charcoal canister as the return line.

The flow won't quite be double with 2 pumps and a Y block due to increased line restrictions, but 2 FD pumps should flow enough for over 600 HP

 

I would run two supra pumps and upgrade the fuel line. You have put too much work and money into your rx7/supra monster to experiment with fuel delivery.

 

I'm the only person dumb enough to run two differently sized pumps, but that is because my pumps run independently to the fuel rails (the fuel rails are not connected to each other at all, with an FD pump feeding the primaries and cosmo pump feeding the secondaries).

The reason I ended up at this solution was because of the fear of running a Y block and having one pump stop working (next thing you know you are at full boost but only have fuel from one pump, and pop goes the weasel ). So the safer solution (to me) was to run two independent fuel circuits for each rail. I am using the evap hard line for the second pump. In the case that one pump fails, basically that rail dies.... that's something you'll notice for sure before you have a problem. If its the primary, the car will just stop dead in its tracks. If its the secondary the car will fall on its face when you get on the gas. To prevent backflow pressurizing the other rail, I installed check valves for each line at the regulator. It's not fool proof, and hopefully someone can tell me the problems a setup like this introduces... but to me it was a safer way to go.