Trap Speed - Can a bad launch impact it?
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Trap Speed - Can a bad launch impact it?
Does anyone have an idea as to how much a bad launch will impact your trap speeds. Ran over the weekend and spun really bad off the line. Had to let of the gas a few times to let the wheels catch. How much, if at all, do you think this impacts the MPH in the 1/4 mile. I realize it does impact the time, but what about the MPH. Thanks
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From: South Florida
STS,FGT,12C,P85D,M4
post all the time data, and we can look.... 1/4mile et/mph 1/8 mile et/mph, 60' etc...
if you want to get a good idea of your trap speeds, leave ESP on, and just jump on it slowly off the line for .5 sec, then hammer it....
most of the time the traps will be pretty consistant, good launch or bad...
BUT, if you have to keep letting off the gas down the track, then it will bring down the traps.....
if you want to get a good idea of your trap speeds, leave ESP on, and just jump on it slowly off the line for .5 sec, then hammer it....
most of the time the traps will be pretty consistant, good launch or bad...
BUT, if you have to keep letting off the gas down the track, then it will bring down the traps.....
Originally Posted by MB_Steve
Does anyone have an idea as to how much a bad launch will impact your trap speeds. Ran over the weekend and spun really bad off the line. Had to let of the gas a few times to let the wheels catch. How much, if at all, do you think this impacts the MPH in the 1/4 mile. I realize it does impact the time, but what about the MPH. Thanks
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From: Salt Lake City (but not Morm)
2003 E55 & 2014 GL550
post all the time data, and we can look.... 1/4mile et/mph 1/8 mile et/mph, 60' etc...
When you get a sec....let's take a look.
You'd be surprised how great that "quickly but smoothly without mashing" launch technique works. Fastest stock Benz in the US swears by it.
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Originally Posted by Fikse
post all the time data, and we can look.... 1/4mile et/mph 1/8 mile et/mph, 60' etc...
if you want to get a good idea of your trap speeds, leave ESP on, and just jump on it slowly off the line for .5 sec, then hammer it....
most of the time the traps will be pretty consistant, good launch or bad...
BUT, if you have to keep letting off the gas down the track, then it will bring down the traps.....
if you want to get a good idea of your trap speeds, leave ESP on, and just jump on it slowly off the line for .5 sec, then hammer it....
most of the time the traps will be pretty consistant, good launch or bad...
BUT, if you have to keep letting off the gas down the track, then it will bring down the traps.....
60 ft. .............1.8
1/4 mile............12.072
MPH.................115.8MPH
Recently got the Kleemann I/C Pump which I think helped tremendously. Had to drive 45 minutes to the track and ran it immendiately when I got there. Had a chance to run it 6x. Experimented with ESP off, shifting manually, etc. This was my last run of the day. Car never had a chance to cool off. Literally had no more than 5 minutes cooling period between runs.. Trying to break into 11s. This was frustrating, but I think with a cooler engine and a better launch I can get there. FYI, this was on PS2s.
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Originally Posted by KenE55
You call a 1.8 second 60 foot time a bad launch? That's about 0.1 better than my best ever...
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From: Palm Beach Gardens, Fla.
2004 E55
Originally Posted by MB_Steve
Yes, spun like crazy off the line and had to let off the gas. It was actually a 1.88 or 1.87 (maybe). Not a 1.8 flat. Also my car is not stock. Has Renntech upgrades. ECU, pulley, headers, and airbox..
Your 60' and et are Very Respectable! To have a 12.0+ trap et, you should be knocking on the door of 120mph's trap speed. Based on your times, it would appear you do have a cooling issue .... as the motor is building boost thru the 1/4, the intake charge is probably getting to hot and the timing is being retarded...hence your low 115mph trap speed............
GET the cooling upgrade!!:zoom:
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From: South Florida
STS,FGT,12C,P85D,M4
1.80 - 1.89 is actually a pretty good launch.... and your ET and MPH line up pretty well.....
the ET and MPH don't line up with your mods though.... you should be pulling 120+ traps easily with your level of mods....
questions:
what track was it at? and what was the outside temps?
have you had the car dyno'd?
have you had the ECU service campaign done and the computer re-flashed by RENNtech?
the ET and MPH don't line up with your mods though.... you should be pulling 120+ traps easily with your level of mods....
questions:
what track was it at? and what was the outside temps?
have you had the car dyno'd?
have you had the ECU service campaign done and the computer re-flashed by RENNtech?
Originally Posted by MB_Steve
Yes, spun like crazy off the line and had to let off the gas. It was actually a 1.88 or 1.87 (maybe). Not a 1.8 flat. Also my car is not stock. Has Renntech upgrades. ECU, pulley, headers, and airbox..
Last edited by Fikse; May 15, 2006 at 01:14 PM.
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Originally Posted by Fikse
1.80 - 1.89 is actually a pretty good launch.... and your ET and MPH line up pretty well.....
the ET and MPH don't line up with your mods though.... you should be pulling 120+ traps easily with your level of mods....
questions:
what track was it at? and what was the outside temps?
have you had the car dyno'd?
have you had the ECU service campaign done and the computer re-flashed by RENNtech?
the ET and MPH don't line up with your mods though.... you should be pulling 120+ traps easily with your level of mods....
questions:
what track was it at? and what was the outside temps?
have you had the car dyno'd?
have you had the ECU service campaign done and the computer re-flashed by RENNtech?
So do you think that my not achieving 120s has nothing to do with my launch?
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I think your 1.8 60ft has nothing to do with your 115 trap speed. Something else is holding you back. What tires was this done on? If it was the stock tires that is great!! Most likely it is a cooling issue like most have said.
Trap Speed = Much power your making
60ft = how good your traction is
Trap Speed = Much power your making
60ft = how good your traction is
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From: Emerald City
2006 E55 Black
Based upon experience with my stock car, I have consistently found that a great launch reduces the ET but actually lowers the trap speed. You simply have less time to accelerate. My best ET (12.49) was one of the lowest traps (112.3), while my worst ET (12.676) was my best trap (115.95). I believe a good launch effectively shortens the race, which means you just don't have time to get to those higher speeds.
If I can get nearly 116 bone stock, I'm surprised so many modded cars have only marginally faster traps.
If I can get nearly 116 bone stock, I'm surprised so many modded cars have only marginally faster traps.
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Originally Posted by Mad TKD
I think your 1.8 60ft has nothing to do with your 115 trap speed. Something else is holding you back. What tires was this done on? If it was the stock tires that is great!! Most likely it is a cooling issue like most have said.
Trap Speed = Much power your making
60ft = how good your traction is
Trap Speed = Much power your making
60ft = how good your traction is
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Originally Posted by Mad TKD
how are you launching the car? esp on or off
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From: El Paso, TX
'03 G500, '13 G63, '17 GLS63,
I had a strange night once where I was running 106mph traps. I thought my car was broken. However, I noticed that the ESP light was blinking halfway down the poorly prepped track. Went to another track and it was running right on par with other E55 traps. I'm guessing the ESP was slamming on the brakes hard throughout the runs.
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I sent you a PM......
Originally Posted by MB_Steve
I agree. I also think I should be trapping in the 120s.. I haven't had the car dynoed. Wanted to do it before the upgrades, but didn't get a chance to do so. Without a base run I figure to dyno now would be useless. I did have the ECU service campaign done and the computre re-flashed by Renntech. I ran it at Englishtown, NJ on Saturday afternoon. Temperature was in the mid to low 60s. Last week I got the Kleemann I/C pump upgrade because I thought my car was heatsoaking during the runs. It might run better cooler, as I ran it pretty hard to the track and once there I ran it 6x before getting the 12.072.
So do you think that my not achieving 120s has nothing to do with my launch?
So do you think that my not achieving 120s has nothing to do with my launch?
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Originally Posted by KenE55
Based upon experience with my stock car, I have consistently found that a great launch reduces the ET but actually lowers the trap speed. You simply have less time to accelerate. My best ET (12.49) was one of the lowest traps (112.3), while my worst ET (12.676) was my best trap (115.95). I believe a good launch effectively shortens the race, which means you just don't have time to get to those higher speeds.
Think about this:
The car that gets to 60 ft the quickest is accelerating the fastest.
A car like the E55 will easily overpower the tires on a hard launch and give a poor 60 ft time. Now, if that same E55 is down on power, the tires have a better chance to grip and will produce a quicker 60 ft time. BUT, that same car will have a slower trap speed because it's down on power.
60 ft times and trap speeds are not highly correlated.
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Originally Posted by Grumpy666
Your observations have no real merit.
Think about this:
The car that gets to 60 ft the quickest is accelerating the fastest.
A car like the E55 will easily overpower the tires on a hard launch and give a poor 60 ft time. Now, if that same E55 is down on power, the tires have a better chance to grip and will produce a quicker 60 ft time. BUT, that same car will have a slower trap speed because it's down on power.
60 ft times and trap speeds are not highly correlated.
Think about this:
The car that gets to 60 ft the quickest is accelerating the fastest.
A car like the E55 will easily overpower the tires on a hard launch and give a poor 60 ft time. Now, if that same E55 is down on power, the tires have a better chance to grip and will produce a quicker 60 ft time. BUT, that same car will have a slower trap speed because it's down on power.
60 ft times and trap speeds are not highly correlated.
Ted
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Originally Posted by Ted Baldwin
..............I understand that it may not seem to make sense, but it is indeed the experience of many at the dragstrip that your trap speed does go down with improvement in your 60ft time. Infact you can tell a fake timeslip by noticing no decrease in tra pspeed with improvements in 60ft time. Perharps Fiske can chim in.
Ted
Ted
https://mbworld.org/forums/w211-amg/141238-finally-tracked-car.html
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From: Mia
2005 E 55
Your 60ft does not affect your trap speed as much as everyone seems to think. Something else is causing your drop of 5 to 8 mph, its probably the weather or most likely ic heat soak.
The car's 60ft will not change more than 1 to 2 mph of trap speed from my experience. Contrary to popular belief your car can 60ft better and still trap higher mph.
The car's 60ft will not change more than 1 to 2 mph of trap speed from my experience. Contrary to popular belief your car can 60ft better and still trap higher mph.
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Originally Posted by rflow306
Your 60ft does not affect your trap speed as much as everyone seems to think. Something else is causing your drop of 5 to 8 mph, its probably the weather or most likely ic heat soak.
The car's 60ft will not change more than 1 to 2 mph of trap speed from my experience. Contrary to popular belief your car can 60ft better and still trap higher mph.
The car's 60ft will not change more than 1 to 2 mph of trap speed from my experience. Contrary to popular belief your car can 60ft better and still trap higher mph.
Ted
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Here's some real-world fodder to graze on. The link below shows groups of time slips for the same car on the given day. Each group represents a different level of mods for that day. Take your time and scan down the 60 ft and 1/4 mph columns. I didn't plot the values in Excel, but in my head it formed a scatter plot, which indicates no correlation. For a valid comparison, stay within a group. It is nicely documented.
http://www.jumptronix.com/TeamJumper/Time_Slips.htm
I Googled 60 ft time trap speed to find this URL - it was the 7th listing on the 1st page.
http://www.jumptronix.com/TeamJumper/Time_Slips.htm
I Googled 60 ft time trap speed to find this URL - it was the 7th listing on the 1st page.
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Originally Posted by Grumpy666
Here's some real-world fodder to graze on. The link below shows groups of time slips for the same car on the given day. Each group represents a different level of mods for that day. Take your time and scan down the 60 ft and 1/4 mph columns. I didn't plot the values in Excel, but in my head it formed a scatter plot, which indicates no correlation. For a valid comparison, stay within a group. It is nicely documented.
http://www.jumptronix.com/TeamJumper/Time_Slips.htm
I Googled 60 ft time trap speed to find this URL - it was the 7th listing on the 1st page.
http://www.jumptronix.com/TeamJumper/Time_Slips.htm
I Googled 60 ft time trap speed to find this URL - it was the 7th listing on the 1st page.
Ted
