I was having a think about it and i was wondering if there would be any advantage/disadvantage to running a ls style fuel system i was thinking it would create less heat soak to the fuel as its not passing through the rail before returning to the tank. and you can run a straight twin feed setup. our setup ls setup
I like it, would be less under plenum clutter too. I'm guessing it keeps the fuel rail pressurised at all times then?
Not 100% certain but if it's programmed in to the ECU to simply give a good burst on the injectors when the engine is hot and cranking then it would clear any vapour quickly. Should be able to do the same with a decent ECU in a Z32 and if I had to have a guess I'd say this is all they will be doing. Actually plenty of cars do not return fuel to the tank from the rails so most manufacturers don't seem to consider vapour lock a big problem. Just making you aware it is a possible issue but there are ways around it :zlove:
Seeing as on start ours batch fire our injectors I wounder if that would suffice. This being said I have long been suffering from what I have wondered to be vapor lock and it does not help......... I have trouble starting my car in the heat of the day if the car has been left for than 30 mins or so..... it cranks for 5-10 seconds before it fires. once it fires it starts straight off. Worst fuel for it is vortex, Keep the car in the shade no issues, but I digress. If the batch fire would not appease the vapor lock gods could it be modified to do so? with the correct tune. finally does our fuel temp sensor give a reading that may identify vaporlock.
hey chris most people ditch that intank filter reg combo (not sure why, might be a restriction?) easy way would be to run a reg like on my car: Aeromotive Reg It handles the feed and return so effectively you could mount it in the back if you wanted to but for a turbo car it would still need a vac line. would still need a filter up front though but at least the fuel doesn't pass the rail and return.
ive never had or seen efi cars get vapor lock(not saying it doesnt happen) ive seen plenty of old carbie cars get it. you would still have the reg in the engine bay and not down at the tank. i think it would simplify the fuel system on the zed
yea kirt just like that. i was just wondering the advantages/disadvantages of not having the return in the fuel rail.
Seems like a lot of fart arsing about for something that could be solved with a inline fuel cooler...
well its not really allot af fart assing about 80% of us have aftermaket regs anyway its just the way we rout it. i would have the system as a twin feed no return. im wondering if it can supply more fuel or if its just the same
The main advantages of a deadhead (Factory LS style) fuel system are the there is no heat sink and the plumbing is cheaper/simpler. Most modified LS cars change to a return line system. The return line system is self bleeding and will control fuel pressure more accurately than a deadhead system as the regulator is closer to the injectors. Heat sink is a big problem for street cars running a return line system, particularly with a fuel pumps without a speed controller. A fuel cooler on the return line will help.
Sorry, re-read it. Thought you were going to put the reg in the tank. Can't think of any clear benefits either way. Do it and let us know And are you still making those bored out standard fuel rails?
Another big advantage of a return line system is that a boost referenced regulator will be able to bleed off the higher fuel pressure when the boost is dropped. In a deadhead system the higher pressure fuel is trapped at the injectors until the fuel is consumed.
Why not do one of these? http://www.ebay.com/itm/Flex-a-lite...r-/350606984243?forcev4exp=true&forceRpt=true
Its my understanding that EFI "should" be imune to vapor lock. There is part of me that wonders if it is the "chip" that has been fitted to my ecm or maybe I have a regulator issue or even an injector that is faulty and on hot starts it is overfueling. My guess now days tends more to the Chip but seing as I dont have a factory one I can not compare. It has not always been there however even though the chip has and is definately worse on Vortex fuel which I have been told has a slightly lower density due to its additives. I do not know if that tidbit of info is genuine or BS.
Wouldn't the time frame for this high pressure would be absolutely minimal? seeing as fuel does not compress the moment all 6 injectors have fired at least once I would figure the extra pressure would be well and truely gone. I am happy to be wrong with this comment, just curious.
The euro zeds had diff coolers didn't they? How about modding one of those to suit a big fuel system utilizing the HICAS lines to route the fuel supply and return?
