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Old 02-20-2012, 04:05 PM   #1
DoomsdayFAN
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Question How much gas in the tank during a 1/4 race?

Whether you're racing for time or racing against another car to be first across the finish line, what is the best amount of gas to have in your tank while doing so? I've heard some people say to go with a full tank, but others have said try to get it right around a quarter tank. So what's best to ensure your car gets every possible advantage?

As far as cars go, I'm simply refering to your averagely modded (CAI/Exhaust) Focus, or in my case, an ATX Sedan. Nothing special like turbo or "track only" cars.


Also, I figure the next time I go to drag, I'll take everything out of my car I don't absolutely need right then and there. That means my spare tire, my jack, my Craftsman automobile tool kit, my tire iron, etc. I figure by ditching these things it'll help me lose an additional 60lbs, give or take. That's got to count for something, right?


Does anyone happen to know the thrust to weight ratio in the Focus? As in, for every 100lbs of weight gain, you lose something like .10 off your times?


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Old 02-20-2012, 08:39 PM   #2
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You want to run with the least amount of gas in the tank as possible to reduce weight. With that said you need to keep enough gas in the tank so the pump does not starve for fuel.

As far as weight reduction at the track for a street car its always a good idea to completely strip the trunk bare. Also remove any items in the car itself which is also a safety precaution. You can go more extreme but it's a street car not a race car.

Also remember a few things at the track to increase the rear tires to the maximum PSI. Front tires are dependant on grip and track conditions. I start at 25psi and work my way down from there.
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Old 02-20-2012, 09:22 PM   #3
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i run 1/2 tank when i go, but I'm return fuel system. On a stock fuel tank you can run 1/4 tank and be fine. bryan (bwinkles) runs a 1/8 tank lol
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Old 02-21-2012, 02:01 AM   #4
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Thats good to know. At times, I've run my tank til the gas light comes on, and then I kept going. :D Not good I guess.But yeah, next time I go, I'll take everything out of my car and just show up bare with just myself in it, a quarter tank or less, and hope for the best.

And when I get a header, exhaust, and tune, hopefully all that, plus the empty car, will help me achieve my desired goal of 14s for the 1/4 run.
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Old 02-21-2012, 07:53 PM   #5
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Quote:
Originally Posted by DoomsdayFAN View Post
Thats good to know. At times, I've run my tank til the gas light comes on, and then I kept going. :D Not good I guess.But yeah, next time I go, I'll take everything out of my car and just show up bare with just myself in it, a quarter tank or less, and hope for the best.

And when I get a header, exhaust, and tune, hopefully all that, plus the empty car, will help me achieve my desired goal of 14s for the 1/4 run.
4 Door Sedan weighs a good bit... 2.0L Duratec or 2.3L Duratec?

2.0L I can't see you running 14's with Intake,Header,Exhaust,Tune. I would aim for low 15's.
2.3L Very possible for 14's.

Your 60ft times will determine how good you run. I've seen some quick bolt-on cars run off what they expected when they go to the track, takes practice to launch correctly.

Speaking of going to the track, you will want to look at upgraded motor mounts to keep wheel hop down at the track. Not only will it improve your times it will save your axles/diff.
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Old 02-21-2012, 11:05 PM   #6
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I'll certainly look into motor mounts. btw, it's a 2.0L

Well, do you think with Intake/Exhaust/Header/Tune/Empty Car AND coilovers w/ new tires, I could run 14s?



I went to the drags today (they're closed but the gate to get out there was wide open) so I drove out there and found some dude out there who looked like he was working on something, so I asked if I could line up and make a run and he said he didn't care. So I lined up, reved my car while pressing on the break, then launched off. By the time I passed the 1/4 marker, I was doing exactly 80mph. So, 0-80 in 1/4 mile with only a CAI and nothing else (not even a tune), how good is that? I know it's nothing even remotely special, but now at least I know what I'm running. Do you think that post header/exhaust/tune I'll be able to make the same run and get up to 95+mph by the 1/4 mile marker?
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Old 02-22-2012, 08:58 PM   #7
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Hate to break it to ya, but you arent going to hit anything in the 14's with even those mods. the 2.3 would be at the point of getting ther but still wouldnt.
The only stock car except for the mods stated minus the header that busted into the upper 14's was squirting nitrous.
nore like mid to high 15's is luck is with you. been there, done that, wont do it again. waste of money imho.
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Old 02-22-2012, 11:45 PM   #8
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Not including a Turbo, Supercharger, or NOS, what other kind of mods would I need in addition with the CAI/67mm TB/Header/Flexpipe/Exaust/Tune/Empty Car to get me to the 14s?


Mid-to-high 15s is decent for an ATX 2.0 Duratec Focus Sedan, isn't it? I mean, as it is now, I'm probably running 17s-18s or something like that. So in the 15s sounds pretty good to me, for what the car is.
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Old 02-23-2012, 10:36 PM   #9
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with those mods and the slushbox high 15's unless the tune also firms the shifts and raises the shift points, then maybe somewhere in the mid 15's.
without either seriously building the motor or running some type of boost or power adder its pretty out of reach. not saying it cant be done.
Look at how much all those parts add up too, is the hunt for what little your going to gain vs the cost for parts worth it? the tune itself is going to run a minimum of 350 just for the tuning unit and a custom tune by a reputable tuner is going to add another 300-600 to that.
Not trying to dissuade you, just pointing out reality and sometimes reality sucks when the big picture (costs vs gains) is looked at.
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Old 02-24-2012, 05:33 PM   #10
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Quote:
Originally Posted by goinloco1 View Post
with those mods and the slushbox high 15's unless the tune also firms the shifts and raises the shift points, then maybe somewhere in the mid 15's.
without either seriously building the motor or running some type of boost or power adder its pretty out of reach. not saying it cant be done.
Look at how much all those parts add up too, is the hunt for what little your going to gain vs the cost for parts worth it? the tune itself is going to run a minimum of 350 just for the tuning unit and a custom tune by a reputable tuner is going to add another 300-600 to that.
Not trying to dissuade you, just pointing out reality and sometimes reality sucks when the big picture (costs vs gains) is looked at.

Uhg, yeah, that's my problem. Every time I think about this, I want to sell my Focus and go buy a different car. One that'll be a hell of a lot faster.

But the Foc runs good, and mod'ing it would be fun. I just know it wouldn't make me all that fast, which just kills me to know that. So, I don't know what to do.



Also, here in Cali the highest rated fuel we have is 91 (out of 87 - 89 - 91), so what if I had my tuner tune me to 91 gas? How much difference would that make?
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