Top Fuel Warmup - Brainerd, MN

A closeup, steady shot of NHRA Top Fuel Driver David Grubnic warming up his car in the pits.

Category:

Sports

Tags:

• NHRA
• Brainerd
• MN
• top
• fuel
• warmup
• nitro
• loud
• pits
• grubnic
• dave
• drag
• race

[Krisspychiken]

what are they actually doing when it explodes? just punching the accelerator? or just backfiring

[luckyleaf6]

I'm not a top fuel expert and correct me if I'm wrong, but what they are doing is a process in the engine warmup called seating the clutch. The driver releases the clutch (similar to a manual transmission on a passenger vehicle)which applies pressure to the clutch system on the back of the motor. Then they whack the throttle open for a few tenth's of a second a few times to tighten together or "seat" the clutch plates in the bell housing (that bulbed shape thing behind the engine)

[bready123]

at 47 he is just setting the throttle to idle as you can hear the revs drop. the fuel pump is set at full at all times other wise there would b danger of over leaning the engine.

[luckyleaf6]

Although I cannot say for sure exactly what happens at :47 I am certain that these cars do the burnout on one fuel pump,fuel cars have two, therefore I am cetrain that the fuel is not set to full all the time. My conclusion was based on the fact that you get a similar effect when the second fuel pump turns on after the burnout procedure just prior to lighting the second bulb at the start. Also you can see the Jon pull a lever where the fuel pump is located. Can anyone back me?

[harley333man]

They used to have two fuel pumps/two controls. Usual set up now is one control/two pumps. Warming up and burning out they set fuel pressure to around 50 PSI. On the run it's around 600PSI. At 0:47 he's setting the pump valve full open, as for the launch and run. The idle RPM drops with full fuel pressure, as the fuel/air mix changes. Some people I know are now using 120 gallon pumps, measured at 8000 RPM. Some of that is always sent back to the tank, and the return flow is altered on the run.

[luckyleaf6]

Thanks for clearing that up.

[pittdready]

Lol, you pinhead. The drop is from the second fuel pump being turned on and loading the motor. THE RATIO IN THE TANK IS THE SAME JUST MORE OF IT BEING ADDED YOU FUCKING IMBECILE!

[CSXer]

CH3NO2....Mmmmm....,

[sanfranciscobay]

@luckyleaf6

Here's an explanation from a driver. Type this into the youtube search box

Ron Capps walk through of a Top Fuel Dragster warmup LitbyNoonProductions

[TheRMSAndre1]

Try putting that engine on your Civic.:D

[tehshadow23]

@Krisspychiken dunno

[300Z31]

@harley333man Yup, you can tell when they make the switch because those fuel cars get awfully quiet. It's kind of neat really. Great explanation.

[tfxbillet]

@michaliscon they actually do produce a dyno that is capable of handling this much horsepower. the problem is an 8,000 to 9,500 nitro burning engine will expire in ten seconds (at full throttle) therefore not lasting long enough to collect the data they need

[licmy3balls]

this NEVER gets old. i fail to see how one could be excited about football when you have shit like this to watch.

[whitetrashchevyluvr]

That is NOT a Chevy!!!!!!!!!

[nitr0junki3]

after grubby whacked the throttle the first time, what was the crew chief looking back at the rear of the engine/rear end are before grubs hit the throttle the second time? thanks guys, big nitro fan here in NC, waitin anxiously for the charlotte and richmond events coming soon!!

[Polybun]

Oh that's not true. Anything that makes that kind of power does the same thing. Stand on the foot plate of a large 4-8-4 northern steam loco. They make right around 5000-6000hp as well, and they let you know it.