Drag Racing Tech Question

[Ninety8stang]

Me and my dad are having a little debate over 60ft times vs. your overall MPH. It's to my understanding that when you get a better 60ft your MPH will drop. Let's say you ran a car with stock tires and then threw a set of DR's on and cut a better 60ft. I guess my question is does a better 60 decrease your MPH?

 

[OnyxCobra]

I believe so, it always seemed like the more i spun off the line the higher my MPH was despite the slower ET.

 

[BLOWN 95GT]

Where is MODO when you need him to explain something :dontknow:

 

[MustangChris]

easy button?

 

[duff daddy]

I believe so, it always seemed like the more i spun off the line the higher my MPH was despite the slower ET.

Awesome great technical advise from a long time drag racer.






Drag Racing is funny, your 60' can tell some of what your doing and alot of people hang on that number. However your 330 is more of a tell tale sign of how the overall run is going to end up. It is real easy to cut a good light, hook and move 3 car lengths, but the 1-2 shift and sometimes 2-3 depending on car/trans/gear will tell you a whole lot more then the 60'.

If you look at alot of your slips it seems the slower the ET the higher your MPH is. Its odd how it happens but it is. With most of our cars being on the slow end of the sport our numbers are a little more difficult to track then others. We have more variables then most and our cars and ourselves are less consistant then the higherup's in the sport.

 

[OnyxCobra]

Duff were you being sarcastic?

 

[Venom351R]

No that's pretty much right on. My highest MPH Trap is 110 but no where near my best ET. My best ET was done on a run where I trapped at 108.

 

[duff daddy]

Duff were you being sarcastic?

lol yea :thumbsup:

 

[OnyxCobra]

Duff were you being sarcastic?

lol yea :thumbsup:

well then can you stop acting like an asshole? I wasn't claiming to be a pro, just telling it like i saw it.

 

[Venom351R]

Duff's always an A hole lol

 

[Ninety8stang]

i appreciate the information guys. haha but it seems we are getting slightly off topic.

 

[OnyxCobra]

Duff's always an A hole lol

That doesn't make it okay...

 

[Chris_Scott]

I agree with Duff on what he said..a lot of street/strip cars are really inconsistent and there is a lot more than plays into a run than a 60' ...however that really wasn't what the OP was asking

NMRA Pure Street guys will agree..they consistently cut 1.33-1.37 60'...their telltale sign of a good pass is the 330'

Anyways..so that my post is on topic and somewhat constructive.

OP..think about it like this..if you spin off the line and have a slower ET..that means your car has more time to accelerate, thus the higher trap speed.

Duff's always an A hole lol

That doesn't make it okay...

Welcome to the interwebz.

 

[duff daddy]

OP..think about it like this..if you spin off the line and have a slower ET..that means your car has more time to accelerate, thus the higher trap speed.

Great way to put it!!!

Duff's always an A hole lol

That doesn't make it okay...

Im not trying to get off topic but alot of the posed question has been answered.

 

[Venom351R]

Point being dont worry about your trap speed other then an indication of what you should be running for an ET, other then that your 60' is more important then much more of the run. The 330 can be blown b/c of the 60' so the first thing to get right is the 60' then make sure you make a good shifts after that so your 330 is not junk

 

[Chris_Scott]

Point being dont worry about your trap speed other then an indication of what you should be running for an ET

The only thing MPH is good for..is a good indication of how much power you are making..think of it as sort of a real world dyno.

My old NA setup would trap 113-114 all night...but it wasn't going to run the ETs because of gearing&tires.

 

[uncltrvlnmatt]

I am going to disagree with DuffyBoy. Although I am going back quite a while, my best ET was 12.58 which tied my best MPH of 113. When I was on, I was running low 12.60's @110-113MPH. My car was capable of running low 12's but I had the wrong gears in the back.

 

[Chris_Scott]

I am going to disagree with DuffyBoy. Although I am going back quite a while, my best ET was 12.58 which tied my best MPH of 113. When I was on, I was running low 12.60's @110-113MPH. My car was capable of running low 12's but I had the wrong gears in the back.

He already addressed that issue.

"If you look at alot of your slips it seems the slower the ET the higher your MPH is. Its odd how it happens but it is. With most of our cars being on the slow end of the sport our numbers are a little more difficult to track then others. We have more variables then most and our cars and ourselves are less consistant then the higherup's in the sport."

Cars that are dialed in correctly ..will follow the trend of 'faster ET = lower trap'

Most street cars at the track are not dialed in. Wheel spin, shifting points, speed between shifts, how the suspension unloads on the launch and between shifts, track temperature, DA, and prep alllll make a difference.

...so just because of that ONE pass...doesn't mean he is incorrect. That just means A) your car isn't set up properly B)you had ideal track conditions that day, that allowed you to have a best ET with a high trap as well.

Just for an example

http://www.youtube.com/watch?v=uXxYDBUrzYU

Fast/dialed in cars almost always behave that way at the track.

 

[uncltrvlnmatt]

At the time I was running a 1968 Mustng Gt with a 428CJ. My gears were 4:86's. I should have been running 4:30's When I originally built the car I had 4:11's I was running consistant 12.70's@ 110-113mph with a 1.8 60ft. after the gear swap to 4:86's my 60ft dropped to 1.5-1.6. But I ran out of motor at the big end cracking the rev. limiter at around the 1400ft mark killing both ET and MPH.

 

[Chris_Scott]

At the time I was running a 1968 Mustng Gt with a 428CJ. My gears were 4:86's. I should have been running 4:30's When I originally built the car I had 4:11's I was running consistant 12.70's@ 110-113mph with a 1.8 60ft. after the gear swap to 4:86's my 60ft dropped to 1.5-1.6. But I ran out of motor at the big end cracking the rev. limiter at around the 1400ft mark killing both ET and MPH.

err...1400ft mark is AFTER you pass through the traps?? Unless your engine falls on its face as it approaches the limiter..I don't see that affecting your ET or MPH at all.

Anyways...what you said wasn't relevant to the points me and Duffy made. [unless you are referring to your best time & ET coming after you had made a gear swap..which means you are comparing two different setups..which is apples to oranges]

...however that does sound like a pretty neat car to see at the drag strip!