0-60 & 1/4 mile Times

[Longshot270]

Originally Posted by BlackSTX

Nice little update-
I ran it again now that we are "enjoying" winter weather..... Yes, I'm being sarcastic..... and my 1/4 mile time dropped by a full second. I guess dropping about 70 degrees in intake air temps. makes a nice difference, even if you can't feel it. BTW, this time was with some wheel spin too, which was nonexistent on my previous 1/4 time.
Now if there was a way to keep these temps in the single digit range during the summer......

I noticed the same thing. Going from 100˚ to 60˚ cut over half a second. Also cut a full second off my 1/4 mile.

[88Racing]

I wonder if winterized gas is also playing apart in the dropped times?

[Jackpine]

In the cooler temperatures, you're getting TWO effects that contribute to power. BOTH the fuel and the air are colder, so they are somewhat more dense. This adds up to more energy per fuel/air charge in the cylinders, so, you should see better acceleration. You pay for it though in increased fuel consumption.

As an aside, this phenomena was VERY apparent in the planes I used to fly. In the winter, our jets would just "leap" off the ground (but you couldn't fly as far without refueling). In the hot Texas summers, the old T-33s that I got my basic training in would almost not make it off the ground before we ran out of runway.

One of the preflight calculations you do is "takeoff distance". It needs to be less than the runway length or you don't go. And, a turbojet engine is really just a glorified diesel engine. (It will even burn diesel fuel - but it needs jet fuel for the anti-icing properties).

- Jack

[Longshot270]

Jack's got a good point. But I have also noticed that my truck runs different when they make the switch. I also remember Bill recommending to someone who was having trouble to run 91 tune even though there was 87 in the tank. Maybe they mix the winter stuff to resemble the higher grade fuels.

[BlackSTX]

I considered the obvious effect of the cooler air being denser, which is the very reason I wanted to see what improvement could be had.
Now if there is anyway to keep these temps during the summer, that would be a nice bonus.

One note everyone should consider for winter roads. If you have your shift firmness all the way up, watch for a sudden loss of traction if you're accelerating hard. I have experienced it a couple times already, temps in the teens or lower + cold tires = wheel spin (and instant fish tailing ). It didn't catch me totally off guard, though I was a bit surprised that I was shifting that hard; I usually don't feel it even when the roads have been slush covered.
Let's have a safe winter!

[Jackpine]

Originally Posted by longshot270

Jack's got a good point. But I have also noticed that my truck runs different when they make the switch. I also remember Bill recommending to someone who was having trouble to run 91 tune even though there was 87 in the tank. Maybe they mix the winter stuff to resemble the higher grade fuels.

The "switch" though, comes ahead of the really cold temps for most of us. I still maintain that because of the increased density of the cold fuel, that you are getting more energy out of it per injector shot (which controls volume only) than you do at warmer temperatures, even though it's a "winter blend".

Here in Tucson, they used to blend in MTB? (or something like that) to reduce the Carbon Monoxide (CO) emissions in the winter. Yes, it seemed to hurt mileage. I don't think they use that stuff anymore, since they found it had a cancer causing link, but they DO "oxygenate" the fuel with some additive.

I don't think Bill was saying they actually blend winter fuels to resemble higher octane stuff, I think he just said that the colder overall temps reduced the volatility, which is really what octane is all about (how easily the fuel will "flash ignite"). High octane fuel is simply less "explosive", as is "cold" gas.

Oh, and BlackSTX - GOOD post on winter traction! We don't want any of our members ending up nose into a tree!

- Jack

[Jeb]

well how are the runs now that winter is over. for me, here in south louisiana, it has already reached 85F. i received my programmer yesterday and did a few runs today with it.

best 0-60 was 9.12s. that was with 87T and WOT set to 5000rpm, WOT Fuel set to 1.8%, and Shift set to 25.

best 1/4 mile was 16.5 sec at 85mph. that was 93P with settings same as above.

i have 2008 SCrew. mods are Gryphon Programmer and K&N CAI. I also have 87 octane in the tank now. its 75% full, so i have to burn this tank and retest the 93P settings again. i am running canned tunes. i will get custom tunes as my mods change. i am looking into exhaust (headers and cat-back), elec. fans, and underdrive pullies. that should really let the engine breathe.

[Longshot270]

Originally Posted by Jeb

well how are the runs now that winter is over. for me, here in south louisiana, it has already reached 85F. i received my programmer yesterday and did a few runs today with it.

best 0-60 was 9.12s. that was with 87T and WOT set to 5000rpm, WOT Fuel set to 1.8%, and Shift set to 25.

best 1/4 mile was 16.5 sec at 85mph. that was 93P with settings same as above.

i have 2008 SCrew. mods are Gryphon Programmer and K&N CAI. I also have 87 octane in the tank now. its 75% full, so i have to burn this tank and retest the 93P settings again. i am running canned tunes. i will get custom tunes as my mods change. i am looking into exhaust (headers and cat-back), elec. fans, and underdrive pullies. that should really let the engine breathe.

I would go back to your custom tune and take the WOT fuel down to about 1.4, anything over 1.5 is just wasting gas most of the time. I have mine set to 1.35 for the WOT fuel but since you have a CAI I'd go a little higher(try playing with 1.4-1.5).
Do you have the 5.4 and 4wd? You have a little bit heavier cab but even I run 16.1 every time on the 1/4 with highway (3.55) gears and plenty of weight for the brush guard and tool box type of stuff. I also have the 4.6L under the hood.

[Petros]

I pulled an 6.5 second time once on level 3 canned tune when i first installed Edge EVO for 0/60 mile test. I then used custom level 3 tune (changed gear ratio and tire size to proper setting) and im constantly getting 7.4 - 7.8 seconds now.

Mods are as follows:

K&N CAI
JBA 1 5/8" shorty headers
Magnaflow cat-back exhaust 2.5 inch
3.73 gears
265/60 R18 Michelin's
90,000 miles

[cajunboy2208]

Hope these resize automatically...
Best time was a 15.65 and that was with me editing my already custom tune...
The Gryphon said I would run 15.1s, well, it lied. lol. A good .5-.7 secs off my actual runs.

The last one I was going against my buddies 96 Z28. I was surprised I beat him in the 60' mark. I had 2.312 to his 2.331. The low end torque on these trucks are amazing!