• Welcome to the Contour Enthusiasts Group, the best resource for the Ford Contour and Mercury Mystique.

    You can register to join the community.

Options for more fuel

kscontourkid said:
well at the peak of the injectors capabilities im wondering if the average fuel pressure (at max injector capacity) is allowig the bank 1 injectors to produce more flow vs the bank 2 injectors... the fuel rail runs 3,2,1,4,5,6... what i am saying (this is all theory) is the the average fuel injected from injectors 3,2 and 1 is higher than the average of the fuel injected from injectors 4,5 and 6 possibly due to the fact at MAXIMUM possible injection given the slight drop in pressure between the 2 banks that bank 1 is recieving a little bit more fuel than bank 2... this may be a normal condition that no one has noticed before because they havent tested it as expensively as you have... and/or the right person has not chimed in yet...
Click to expand...
OMFG SOMEONE GETS IT!!!! That's the theory I was trying to explore from the jump. Though it seems to be agreed upon by those in the know, that this couldn't happen. If bank two cannot be getting LESS fuel because of this theory, I would expect it to be agreed upon that bank one could not be getting MORE. It's seems to be believed, very strongly in fact, that bank 1 could not hog the fuel to starve bank 2, given adequate fuel pressure. I think it's a consensus that there could not be enough pressure loss between the schrader valve, (where you get the pressure reading), and the last cylinder fed, (#6), to cause this. I'm not sure where I stand on it at this point, but once I ruled out an obstruction in the rail, I gave up on this theory because of all the resistance just trying to talk about it.
 
like i said it is just a theory i have not tested anything. i can see where everyone else would say it is not possible due to the fact that the injectors are not pushed to any limits.

in this case it seems they are being pushed to their absolute limit given the pressure but as per the theory of hydraulics this occurance is slim to impossible. i would like to see what your exhaust tests come up with. are you just going to have the manifolds on? that is how i would test first. it sounds cool too :laugh:
 
I'm going to get readings as it is now, at idle & different points under load. If the back pressure and/or difference between the backpressure of the two banks, is only minimal, then I'll stop there & pronounce the exhaust theory dead. If there IS significant backpressure or a significant difference in backpressure between banks, then I'm going to drop the exhaust from the y-pipe back for some stupid-loud datalogging.
 
oddly enough it shouldnt be that loud... my hybrid 3L running the high compression really wasnt that loud when i was running it straight off the header with no cats lol that will be fun if you do it.
 
Shouldn't be that loud? I suppose loud is very subjective but I would definitely call it loud. Sounded like :censored::censored::censored::censored: too IMO... AND it shot the y-pipe restriction theory dead. It did the same thing with only the exhaust manifolds to channel the exhaust - bank 2 O2 went lean. The interesting thing was what happened as I started messing around with other things while I had it on the dyno. Bank 1 O2 started going lean as well. WTF? Since the wideband in the exhaust was still staying pig-rich, I opted for new O2's.
Problem solved.
So now I've answered my question of exactly why things were happening the way they were, but of course, it all raised more questions as well because both banks now stay rich. Just to verify, I welded in O2 bungs so I could monitor each bank independantly with a wideband. Sure as :censored::censored::censored::censored:, starting just before 5K, it gets crazy-rich, on both banks & stays that way to redline. I'm surprised to find out that the fuel delivery is keeping up. It seems to me that the PCM just commands too much fuel to continue making power passed 5K.

The funny thing is that if I didn't want more power out of this thing, I wouldn't NEED a tune at all. I was told directly by a few people and read stuff from a bunch of others when I started this swap, that what I intended to do, would not work... and yet, it works. In fact, it works just like Ford intended for a 98 SE, to run. Granted, bigger injectors & a tune are going to give me more power, better fuel economy and possibly a host of other things, but, neither is an absolute necessity for the car to run properly - and I've proven it.

That said, my next order of business is deciding what tuning route I'm going to go. :cool:

Thanks to everyone who gave input & tried to help.
 
You must log in or register to reply here.
Back
Top