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Just trying to get an idea of what are the approximate limits of the factory Z06 fuel system when adding more horsepower. I've read that being direct injection that the high pressure fuel pump is the weak link followed by the injectors (short window of time for them to spray). Is there any tips or tricks with the fuel system itself or anything with the tuning aspect that will gain you more headroom? (Commanding more pressure,etc).
Also, does anyone know if any companies are actively working on any fuel system components for our cars?
So basically does anyone know the horsepower limits on
1. Factory fuel system as it sits
2. Factory fuel system when tuning tricks are involved
3 Factory fuel system when running E85
4. Factory fuel system using meth. I'm not totally sure exactly how much further the addition of meth will take you.
Over the winter I'm looking to add more horsepower but not exactly sure how yet that's why I'm asking these questions. I'm either looking at going with a ported factory blower, pulley, e85 etc or just wait for the whipple 2.9 to come out and run low to moderate boost on pump gas. I'd really like to stay away from meth if possible (I know a lot of ppl will probably suggest it) I guess I'd be happy at what ever power level I get with the fuel system maxed out (well close to it anyways) until someone makes some pumps or injectors.
Any advice??
The factory fuel system is adequate with gasoline for all normal mods. I mean pulleys, headers, cam, etc.
The fuel system is TOO SMALL for full E85. Some say you can get away with it. Chevrolet didn't. It's definitely on the ragged edge.
There are no bolt-in-replacement high pressure pumps, but you can buy cams that upsize the lobe that drives the pump, and that gets you additional capacity.
Some people are spraying additional methanol as a fuel, but if not cut 50/50 it's flammable and we've seen a couple of total loss car fires ostensibly related to it.
E40 maximum or 700 rwhp maximum to keep it like stock (625rwhp for LT1)
you can run the fuel system with falling pressures at WOT and squeeze out a little more, overwork the injectors, low rail pressure, etc but to me it's not worth it.
that's why so many bigger power cars are running meth as fuel (for better or worse). meth injection was designed as an intake charge cooler, not for fueling.
you can command more rail pressure to work the pump harder, it helps a little bit, not much, imo. you can also start injection earlier in the cycle, but then you are spraying out an open exhaust valve and losing control of fueling and wideband accuracy (false rich). theoretically you should be able to spray as early as intake valve open but that's really not a lot more time anyways and just a potentially larger fuel loss to the exhaust valve.
Higgs, I was hoping you would reply in here. So basically you're saying a stock fuel system we're looking at 700rwhp max on 93 pump gas? I guess I could live with that (initially..lol). I wonder what kind of boost that would equate to on the whipple?
Higgs, I was hoping you would reply in here. So basically you're saying a stock fuel system we're looking at 700rwhp max on 93 pump gas? I guess I could live with that (initially..lol). I wonder what kind of boost that would equate to on the whipple?
Anyone else have any first hand experience?
max of what i consider ideal, yes. I don't like to push limits, unpredictability not a good thing when it comes to being out of fuel or on the verge of melting metal.
I was told 800rwhp with meth. I'm sure you're going to get many answers on this in here. Bottom line you need to have a good tuner that knows what they are doing.. I'm at 730rwhp with no meth and after 3800 miles and many nights on the street so far so good..
I was told 800rwhp with meth. I'm sure you're going to get many answers on this in here. Bottom line you need to have a good tuner that knows what they are doing..
So what are guys doing to reach 750+ rwhp? Changing out what components? I'm wanting to do the procharger D1 setup, but it's easy to reach 750+ with it.
So what are guys doing to reach 750+ rwhp? Changing out what components? I'm wanting to do the procharger D1 setup, but it's easy to reach 750+ with it.
Medium to large cam with fuel lobe, lower pulley (and upper pulley if you want), ported blower, intake, headers, a good tune. I would run a mix of E25-35 if ethanol is available in your area but this may stretch beyond the limits at 7xx.
Medium to large cam with fuel lobe, lower pulley (and upper pulley if you want), ported blower, intake, headers, a good tune. I would run a mix of E25-35 if ethanol is available in your area but this may stretch beyond the limits at 7xx.
Also, dyno in the winter.
No Cam, summer Dyno :-). Dynojet of course.
Can't stress the need of a good shop....and tuner.
08-17-2016, 03:43 PM
What are the limits of the factory fuel system?
