I think I figured out why my 1/4 times stink
#1
9 is not my lucky number.
Thread Starter
Last Wednesday I went up to New England Dragway and met up with George (Blazing Saddles). I made 4 runs, all about 20-30 minutes apart and did 14.471@98.33, 14.675@98.67, 14.477@95.99, 14.479@98.39. Pretty consistent right?
Then I parked the car and let it sit for about an hour and a half with the hood open. When I came back the engine was dead cold. I got back in line and pulled the best run of my life at 14.109@101.13. I did nothing different than what I usually do. I did the same burnout and launched the same way as always.
I guess the key is keeping the engine as cold as possible. Now I know why George put in that electric water pump. Engine temperature is key. These cars just don't cool down fast enough.
Right after I did this great run my engine was super hot and I could barely touch my K&N intake. I got back in line to race George within 15 minutes of my last run. My engine choked on launch, suffering from the "hesistation after deceleration" BS everyone talks about. I did a 15.366@91.86. I am suspecting that the "hesistation after deceleration" is caused by hot engines choking on hot air inside the engine compartment.
What do you guys think?
Then I parked the car and let it sit for about an hour and a half with the hood open. When I came back the engine was dead cold. I got back in line and pulled the best run of my life at 14.109@101.13. I did nothing different than what I usually do. I did the same burnout and launched the same way as always.
I guess the key is keeping the engine as cold as possible. Now I know why George put in that electric water pump. Engine temperature is key. These cars just don't cool down fast enough.
Right after I did this great run my engine was super hot and I could barely touch my K&N intake. I got back in line to race George within 15 minutes of my last run. My engine choked on launch, suffering from the "hesistation after deceleration" BS everyone talks about. I did a 15.366@91.86. I am suspecting that the "hesistation after deceleration" is caused by hot engines choking on hot air inside the engine compartment.
What do you guys think?
#2
Heat Soak is what your engine is experiencing. It can be seen during long dyno sessions and drag duty. The '05+ will always be known for this above all other issues me thinks.
The trick is to bring a cooler with packets of ice for your intake, it helps a ton between runs with hot outside temperatures.
-Dan
The trick is to bring a cooler with packets of ice for your intake, it helps a ton between runs with hot outside temperatures.
-Dan
#4
Heat soak is definitely a problem. But, from my experience, I can "hot lap" 3 or 4 runs, and see about drop off of maybe .01 - .03 per run. But, if it sets for 20-30 minutes or so, it cools off pretty well (at night, anyway). And yes, I gotta get me an electric pump, too!!
BTW, on your last run, did you have TCS turned off? Sounds like maybe it wasn't.
BTW, on your last run, did you have TCS turned off? Sounds like maybe it wasn't.
#5
9 is not my lucky number.
Thread Starter
Originally posted by don_w@September 19, 2005, 1:15 AM
Heat soak is definitely a problem. But, from my experience, I can "hot lap" 3 or 4 runs, and see about drop off of maybe .01 - .03 per run. But, if it sets for 20-30 minutes or so, it cools off pretty well (at night, anyway). And yes, I gotta get me an electric pump, too!!
BTW, on your last run, did you have TCS turned off? Sounds like maybe it wasn't.
Heat soak is definitely a problem. But, from my experience, I can "hot lap" 3 or 4 runs, and see about drop off of maybe .01 - .03 per run. But, if it sets for 20-30 minutes or so, it cools off pretty well (at night, anyway). And yes, I gotta get me an electric pump, too!!
BTW, on your last run, did you have TCS turned off? Sounds like maybe it wasn't.
#6
#8
Originally posted by don_w@September 18, 2005, 11:36 PM
I would be extremely surprised if heat soak caused you to drop off by almost a full second. I sometimes make as many as 6-7 passes in an hour, and have never seen ETs drop by more than a tenth or two.... from the first pass to the last one.
I would be extremely surprised if heat soak caused you to drop off by almost a full second. I sometimes make as many as 6-7 passes in an hour, and have never seen ETs drop by more than a tenth or two.... from the first pass to the last one.
#9
Team Mustang Source
If you are on stock tires, don't do a burn out. Just drive around the water. If you get some semi-racing tires or slicks, then do burnouts.
My times when down when is stopped doing them.
My times when down when is stopped doing them.
#10
I never thought about the heat myself, could explain why both times I've gone to the strip so far I've got my best time on my first run. Its about a 30-45 minute ride to the strip from my house so the car is nice and hot when I get there. I will have to let it cool down and see if I can shave a few tenths off my time.
#12
#13
Join Date: February 20, 2005
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1/8 mile............8.14@84.71
#16
Originally posted by Blazing Saddles@September 19, 2005, 4:38 PM
It's best to leave the line at 175-180 degrees.
It's best to leave the line at 175-180 degrees.
#17
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Originally posted by don_w@September 19, 2005, 5:42 PM
Wouldn't you be going the wrong direction then?
Wouldn't you be going the wrong direction then?
#18
Originally posted by Blazing Saddles@September 19, 2005, 4:50 PM
Just flip your rearend over and you'll have 5 gears in reverse.
Just flip your rearend over and you'll have 5 gears in reverse.
:worship: :worship: :worship:
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