fuel injectors and sniper

[stangalator]

A little while ago when i bought my pi swap it came with 24lb/hr injectors. I've been looking into the $1500 vortech sticky and reading up on them a little and i've been seeing that people are saying 42lb/hr are the minimum and what not. Also I haven't heard about people tuning your supercharged cars with a hand held tuner like sniper SF or what not. So my question is, can i run a low psi set up (6) vortech with 24lb/hr injectors, stock fuel pump and stock MAF with a sniper tune SAFELY?

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[AirBrontosaurus]

Not even close.

Conservatively, you're looking at about 350 hp. Your stock injectors will run out of steam before that, even at 100% duty cycle, which is not what you want at all.

And even if the injectors somehow could make it, your MAF will also peg way before you get to your max power. And even if you managed to somehow magically get the injectors and MAF to work, your stock fuel pump will not be able to supply the necessary fuel for the mixture up top.

Basically, what would happen is your MAF would peg early on, which means it stops telling your ECU to add more fuel right when the ECU needs to add a whole bunch of fuel; your injectors would be woefully inadequate at providing enough fuel even under perfect laboratory settings; and your pump would be working full blast and still not pump enough fuel. Your engine would go very, VERY lean which is not good.

HOWEVER, you could drive the car around and everything would be fine IF you made sure never to get into high RPMs. Sniper does allow you to tune your car for a blower and keep stock hardware, so your timing and fueling tables would be correct. At low to mid RPMs, your injectors could deliver enough fuel, your MAF wouldn't peg, and your pump could keep the injectors supplied. But if you ever, even once went too high for any of those parts, you would go very lean very quickly. You would have literally no safeguard in place.

So while it could be done, I would recommend against it. And who buys a supercharger to putt around town with anyways ?

[stangalator]

ok, so 42lb/hr, focus svt pump and new MAF would be needed. Could i use them and tune with my sniper hand held safely. the only reason is that all the dyno/tune places that can tune my car are very far away (about 6 hours)

[AirBrontosaurus]

Your tune will be plenty safe. As long as you make those upgrades and put them in Sniper, your car will run perfectly fine. I ran with those upgrades and a Sniper tune for months.

I still would not take it WOT without a wideband (even though Sniper makes their mixtures rich for safety, why risk it?). However, the car will be tuned for all the new upgrades, and your fueling and timing will be fine. It probably won't drive like a dream, but it will certainly drive well enough to get you to the tuner, even if it's 6 hours away.