Hi all , as my fuel pump getting very tired so I want to change it before something bad happen . I have a few option : 1 / stock TT pump , 260 L/h - 330 dollars 2 / denso pump , 265 L/h - 180 dollars 3 / Aeromotive stealth pump , 340 L/h , - 220 dollars . I am leaning forward Aeromotive stealth pump , but just need to know , as It is 30% more flow than Stock TT pump , will it effect badly on idle and fuel economy on stock fuel set up , and stock tune ? Many thanks .
Unless your engine is horrendously modified and already exploiting the limits of its stock pump, then adding a bigger/higher flow pump will have no consequences at all either good or bad. Whatever your wallet allows M8 L8r E
Id say yes. BUT, would I trust it to continue to do it under all circumstanes? Not in a million years!!!! Build in a decent level of headroom into a fuel system and sleep well IMHO!!! L8r E
Even with a new stock pump, its a good idea to measure the voltage to it at the pump end. Low voltage to a new pump is just as bad as an old fkd pump with good voltage. You want to see 13.5 consistent solid volts to get the max flow from a stock pump. http://www.google.com.au/url?sa=t&rct=j&q=300zx%2Bfuel%2Bpump%2Btest%2B&source=web&cd=1&ved=0CBwQFjAA&url=http%3A%2F%2Fwww.stealth316.com%2F2-fuelpumpguide.htm&ei=NUm3TsDTFeGRiQeprfifAg&usg=AFQjCNEqXl20ONQyaUb-IjZEKk_3J8Qhhw
My 20 year old stock fuel system (nothing touched )coped just fine on my last engine .. 20psi all day... over 300rwkw But my cams couldn't take it
I go with OEM pump . It was well proven reliable , and can make a decent power . Little bit pricey , but straits fit and no need to do FUel control unit mode ( earthing out to get constant 12v for aftermarket pump ) .
nismo gtr 279 lph pump for me. flows alot more then stock around 240ish when new.. direct fit.. you will need a new reg as the stock reg cant cope with the extra flow.
IMO , if you just want less than 300 KW ATW , then the stock pump is perfect . No need to fit adjustable FPR , and can keep engine bay look stock . Z was perfect desire , and I try to keep it as stock as possible .
i could of sworn iv seen a write up stateing the stock tt fuel pump will handle 700hp??? And the N.A up to 450hp...
Probably the oldest myth in the book IMHO. Someone has taken the peak lph of the pump put it in a calculator and come up with the answer that the OEM TT pump will support 700RWHP ! They fail to allow for even base fuel pressure let alone increase with boost pressure, or a higher "Brake specific fuel consumption" BSFC for a boosted engine. Its probably theoretically what a carburetted (read low pressure) normally aspirated engine could produce with that pump on a us dyno, IE 700 would be flywheel HP in Australia. Is there any one running 550RWHP plus on a stock pump ? ..... anyone ! See this graph its considered pretty accurate, 250 lph at 35 PSI, notice as the pressure increases flow drops off. Now have a look at this calculated. To make that sort of HP lets play with 20PSI considering some pretty decent size turbos, the stock pump drops to 210 lph. http://2.3liter.com/Calc1.htm#FPHP Choose .4 BSFC for NA and .6 for boosted, put in 840 HP (700RWHP x 1.2 for fly) the MINIMUM flow for an NA is 206 and for boost 309 lph ! Now try it with 700HP fly (sort of converts to 585RWHP on Aust dyno) 172 lph for NA and 257 for boosted. The pump is still theoretically out of its depth. So what will the pump support ? I would estimate about 450-500 rwhp on Aust dyno. This was rough and quick but hopefully it shows what I mean. Also calculators are not the be all and end all, they are guides with and without headroom included, but hopefully the above numbers explain where 700HP comes from. And no fitting a TT pump in an NA will not give it 700HP.
Closest I have seen to verify is Sav's old car. Completely stock fuel system, 750 injectors, new oem pump. 500rwhp at 20psi boost. I do not know what the injector duty cycle was so can not comment on how much more the pump had, but at a guess i would say 550rwhp tops on a stock new pump.
Yeah i agree, that's why I asked some what sarcastically in the beginning of my post if anyone was running more then 550RWHP, some would poke up there but I tried to keep it in the "this is what it will do reasonably reliably all day" format so it doesn't precipitate more myth. But to the OP, put a secondhand OEM pump in if money is an issue or a new one if you care about the car, as was mentioned above regulator overrun is possible with too much flow, how much I don't know, the FPCU is designed to run the pump as low as 6V, some pumps don't like that, make it easier cheaper and end up with a better thing, 2nd hand or new OEM pump for me.
Some more pump ratings http://www.google.com.au/url?sa=t&rct=j&q=aeromotive%20340%20lph%20fuel%20pump%20-%2011142%20%20%20any%20good%20&source=web&cd=7&ved=0CEQQFjAG&url=http%3A%2F%2Frealstreetperformance.com%2Fstore%2Fpages%2Ffuel-pump-comparison-test-5.html&ei=JFa8Tr6kOe6ImQWVxdieBA&usg=AFQjCNGTho7n17k-hERgsdWWECICrq2qeA&cad=rja
Thanks for sharing that was a very good write up. The sum ups for each pump really put things into perspective.
