There's been a bit of chatter lately about twin fuel systems, so I thought I'd throw in a few pics of mine.... Twin FPCU... Fuel Filter.. Lots of hoses and vacuum tubing.. Front of engine showing twin outlets.. Drivers Side showing twin inlets.. Twin Fuel Pressure Gauges, wank factor as they should be the same.. I used the Hicas hydraulic lines to run from the tank up to the front and twin TT internal pumps, so should have plenty of flow
It's really nice, but it's completely over the top... ! But I guess Kyne's got to have something to do since his Z is never drivable
I don't believe the fuel system I don't believe the fuel system is as good as people say. Those tiny lines can't possibly supply enough fuel to keep the Zed going at 300km/hr. Better being over the top than under. Same goes for the twin 3" exhaust. Our Aston Martin (carburetted) was capable of doing 260km/hr on standard setup, but that was with the choke on (believe it or not, it made a difference of 12mph). We found that 5/8" lines were required to supply enough fuel at the correct pressure to keep it going at that speed, and it only put out 171kw on the dyno (keeping in mind this was a carburetted engine). Twin pumps ARE required for long term fuel supply, I'm not building a 1/4 mile machine or something I can throw on a dyno and run full chat for 10 seconds. And yes, it gave me something to do in between each of the 8 bolts I had to put in to bolt the GT28R's up..... I think it worked out to about 5 months per bolt. All this was done without removing the engine from the car too, talk about some skinned knuckles. I may take some pics of the custom external wastegate dumps I made too.
Photos of the rear And also any of where you joined it to the old hicas lines. And (i know im asking lots) how did you mount the second pump? Sounds like a nice setup and its got me thinking too.... that said its $$$$$$$ lately on the zed.
The system definitely has it's merits. Personally I would keep the system single to the point it met the fuel rail then divide the supply and return lines which would certainly eliminate the contraversial lean #6 cylinder
More pics... I bought another fuel pump assembly etc and installed it with a few mods into the other hatch in the tank (where the second fuel gauge sender is). I ran aluminium fuel lines down to the hicas lines at the back as you can sort of see..... It's a bit hard to see anything in there This is where the front aluminium lines join into the Hicas.... These are what you can see of my dumps....
That's what I'm doing with a nippon-denso in tank pump, should be good for around 700hp worth of fuel. Will also be using the HICAS hard lines but as send and return rather than twin sends.
GT28R's I'm running GT28R's, I removed the wastegates and machined out the seats to accept 1 1/2" pipe and wedged the outlet pipe on the dump pipes in there.... hope it works
It looks like quite a good setup but very messy and a hell of a lot of potential leak spots. It would be a scrutineers nightmare and I very much doubt they would pass it actually. There must be at least 20 or 30 join spots there. I am not trying to knock you and think the initiative is great however when dealing with fuel I personally believe the least amount of joints possible is best. You could have ran new lines from the tank in braided hose and chopped out several joins straight away. It might have cost a little more but might save your zed from burning to the ground. I have seen a few track cars end up with that fate and its not a pretty site. I do like your dump pipe initiative though well done Cheers Jason
Scrutineering Would it pass if it were braided hoses and thus eliminating those joins? That said you'd still have to join it to the old hicas piping somehow but then wouldnt that be the same as the stock setup. If im remembering right stock is like so.. pump -> hose -> fuel line -> hose -> fuel filter -> hose -> regulator -> hose -> pipe -> hose -> fuel rail and this would be the same substituting the fuel line with hicas line.
I wish I'd taken pics when they were off I wish I'd taken pics when they were off the car, but didn't. It's very hard to get a decent photo laying under there
Thats pretty close I suspect but his system is doubled at least with dual feed lines etc by the looks of it. There has been a lot of talk within CAMS about fuel system modifications and I believe they are renewing the CAMS manual to reflect these proposed changes for next year. Simplicity is key I think and if not using braided hose use custom hard lines full length its not that expensive to buy it in rolls and personally believe its better to be safe than sorry. I suffered a few fuel leaks this season and its a scarey thing indeed smelling that dreaded smell and looking for flames. How do you go with pink slips and the like.
