Dry Ice in your fuel cell?

[art leong]

I did this at Atlanta one year. It was 92 degrees out and my fuel checked at 45 degrees. Got some weird looks, but explained what I did and it checked fine.
I chopped the dry ice up and put directly into the fuel jugs (half full). I laughed at all the looks I got LOL.
It really didn't seem to make a difference. But at the time I was running quite a bit rich.
I think it would have been worth something if I could retune for the cold fuel (at the time I didn't have the knowlege to retune the ecu).
I think I picked up some (.50) mph. In my case the fuel would probably have cooled the intake air (EFI)
Don't have the time or wallet to test things properly. I tried C25 and picked up between .6 and 1.2 mph. But lost 2 tenths in the short time .050 total. So some tuning would probably have been a net gain. This was tested with 3 runs on C12, then 3 runs on C25, then 2 runs on C12. With no tuning changes and not much DA change.
Some day I'll get around to actually making some tuning changes. With cold fuel or C25 (I was told it needs more timing) Don't really need it right now. Can get into instant trouble in good air.

[Tom Meyer]

Ever put it your fuel jug yes bubbled like a sob make sure the jug is less than half full ,had frost on the out side of my gas tank. Don't remember what the fuel temp was at fuel check but did go 1.36 under. You do need to jet them to be worth anything. The TAFC and TAD were doing this and now is not legal. Tom

[vic guilmino]

what is ln2

[randy wilson]

I think you need to back the timing up a couple of degrees with C-25, and jet up a size or two. Someone may correct me. I purchased two cool cans from a custom builder that you freeze a 16, or 24 oz. beer can filled with water, then slide it down between coils, and fill with water. Don't know if it works, but it looks cool.

[Ed Wright]

Someone mentioned cool cans. We used to use them, back when my hair was still brown. I used dry ice and rubbing alky in mine when I had my Jr Stocker. If you have any water in your fuel, you will find it. Freezing it in the fuel line up once. LOL

We can't use cool cans like we used to. I was told there can not be anything in it to cool the fuel while going down the track. Only before the run. Makes that pretty useless. I guess an EFI car could run the fuel pump to circulate fuel through it and back to the fuel cell because of the return line they all use. Then dump it. Dry ice is "before the run", but I don't know that the oficials approve. As mentioned, guys I have seen doing it don't put the cap back on too quick. A fuel cel is vented, not a fuel jug.

[randy wilson]

You know something Ed, I may have been illegal using a cool can then, but no one ever said a word. But, in back to back test runs, we never really seen anything. What I did see at Bethany was if you laid bags of ice on the intake between runs, there was a much as .03 in it.

[art leong]

At Indy a few years ago. I saw some superstockers during class carrying fuel jugs with blankets on them. Went over and saw the moisture on the outside of the jugs.
It seemed hush/hush but I Added 2+2. Seemed like a great idea. Especially with fuel injection (injector about 3 inches from intake valve). It has to cool the incoming air. My air temp sensor is way ahead of the injector (so ambient air), so I don't know how much.

[Ed Wright]

Originally Posted by randy wilson

You know something Ed, I may have been illegal using a cool can then, but no one ever said a word. But, in back to back test runs, we never really seen anything. What I did see at Bethany was if you laid bags of ice on the intake between runs, there was a much as .03 in it.

Was worth a couple hundredths on my old '56 Chevy, and the next car, 250 hp 327" '65 Chevelle. My C/SM Camaro didn't seem to care.

[Kevin Panzino]

Originally Posted by vic guilmino

what is ln2

Liquid Nitrogen, Vic.

[HandOverFist]

Originally Posted by vic guilmino

what is ln2

Liquid nitrogen...when you need extreme cooling. Transported in a Dewar such as this one...





Not something as easily applied as dry ice. I still think the cooling of the fuel outside the car is the best option overall. Heck, just setting the fuel jug in a cooler with ice/water is a step ahead.