Spanky's 2.2 Turbo Build....Stage 2
10-07-2010, 04:55 PM
#76
Well the LSJ pump is probably going to send fuel at a higher rate/psi, because the LSJ and L61 use a different fuel filter, for that exact reason, the LSJ fuel pump pumps at a higher psi rating.
If you tossed say, 60's in an L61 you're probably going to be demanding fuel faster than the pump can deliver it. I wouldn't say you'd notice right away perhaps, but you'd guaranteed burn your pump out as opposed to 60's on an LSJ.
If you tossed say, 60's in an L61 you're probably going to be demanding fuel faster than the pump can deliver it. I wouldn't say you'd notice right away perhaps, but you'd guaranteed burn your pump out as opposed to 60's on an LSJ.
10-07-2010, 11:38 PM
#85
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Haha, well, it just reads low, and some people don't like that. Then of course, auto's always dyno lower, but I mean, its still accurate of course. Just can't concentrate on the numbers.
10-08-2010, 10:03 AM
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Well the LSJ pump is probably going to send fuel at a higher rate/psi, because the LSJ and L61 use a different fuel filter, for that exact reason, the LSJ fuel pump pumps at a higher psi rating.
If you tossed say, 60's in an L61 you're probably going to be demanding fuel faster than the pump can deliver it. I wouldn't say you'd notice right away perhaps, but you'd guaranteed burn your pump out as opposed to 60's on an LSJ.
If you tossed say, 60's in an L61 you're probably going to be demanding fuel faster than the pump can deliver it. I wouldn't say you'd notice right away perhaps, but you'd guaranteed burn your pump out as opposed to 60's on an LSJ.
First of all, pumps don't 'pump at a certain psi'. Pumps only flow liquid at certain flow rate usually measured at a certain l/hr. A fuel regulator and restrictions in a line is what causes pressure usually measured in psi. Volume and pressure are directly proportional in this matter, and the fuel system could supply a ton of fuel at a low pressure, or not so much fuel at a very high pressure. This is the reason that fuel injectors, fuel pumps, and fuel systems are upgraded in cars because in the end the system cannot support enough fuel going into the cylinders.
The LSJ and the L61 use the *exact* same fuel filter. I recently changed the fuel filter in my 07' SS/SC and my GF's 08' LT, and it was the exact same filter, lines, etc, however a different pump is in the tank. The fuel filter has *nothing* to do with fuel flow or fuel pressure, unless you want to get technical and say that the restriction of the filter causes increased pressure and decreased fuel flow in a small sense. The fuel filter is however where the stock system returns fuel to the tank. Yes, the Cobalt stock has a 'return style fuel system', however it is at the rear of the car, and is not boost referenced or anything, but instead has a simple regulator in the canister in the tank). The fuel pump flows fuel from the tank through the feed line, to the filter, where the flow is split inside the filter, hence the 1 inlet and 2 outlets. Some fuel is sent up to the engine, while the other portion of fuel is sent back to the tank via the return line where it passes though a ball bearing and spring regulator where it is then difused and splashed over the fuel pump to help cool it. That return line to the tank and the regulator causing a restriction is what causes the 58psi stock fuel pressure.
Look at all of the people running E85 or high boost high fuel applications who are still using the stock LSJ pump... The stock LSJ pump after 2005 is a great pump and it flows as much if not more than the Walbro. The 2005 LSJ pump is junk however. The fuel system efficiency can further be increased by using a return style regulator system or rewiring the fuel pump for more voltage hence stability and flow.
I am not sure of the specs on the 2.2's fuel pump, but I'm sure it is not intended to flow near as much fuel volume. If you have a 2006 or 2007 LSJ pump, use it. And no, you can't 'burn u[' a pump in that sense. Yes, it's an electric motor and will fatigue and wear out like anything else, but it's not like the faster you go the harder it pumps... The fuel pump will fail just as easily cruising on a 500 miles trip as it will doing back to back dragstrip passes.
Yes, the LNF is different... The filter is in tank in the LNF. The LNF uses some sort of cam driven fuel pump on top of the engine as well. The fuel pressures are wayyyyyyy higher to support the direct injection. I have never torn one apart like I have a LSJ system so I won't pretend to know anymore about the LNF lol.
Last edited by csementuh; 10-08-2010 at 10:38 AM. Reason: Automerged Doublepost
10-08-2010, 10:36 AM
#98
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You 2.2 people were asking about fuel pumps, and some wrong info was said, so I tried to set the record straight...
Last edited by csementuh; 10-08-2010 at 10:42 AM.
10-08-2010, 11:21 AM
#100
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Yes, the LNF is different... The filter is in tank in the LNF. The LNF uses some sort of cam driven fuel pump on top of the engine as well. The fuel pressures are wayyyyyyy higher to support the direct injection. I have never torn one apart like I have a LSJ system so I won't pretend to know anymore about the LNF lol.