Can humidity make my car this slow.....?
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MBWorld Fanatic!
Joined: Jul 2008
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From: Philly
997TT, C192 GT63, W464 G550, MS Plaid
Can humidity make my car this slow.....?
My previous best was a 11.66 @120 with 1.80 60'. I went to the track yesterday and got 4 runs in. I couldn't even break into 11s and my trap speeds were 113-114. On my best run I got a new personal best 60' of 1.78 and went 12.0@113.39 
It was about 82-85 degrees and 95-100% humidity. Can the weather conditions impact the car by that much? Or should I start trouble shooting, if so where....
Mods..
Evosport Pullies (175mm)
Evosport Ceramic Coated Headers
Evosport Phenolic Spacers
AMG 80MM Throttle Body
LET DynoTune
K&N Air Filters
Custom Exhaust
Johnson CM30
Code3/Spearco Heat Exchanger
It was about 82-85 degrees and 95-100% humidity. Can the weather conditions impact the car by that much? Or should I start trouble shooting, if so where....
Mods..
Evosport Pullies (175mm)
Evosport Ceramic Coated Headers
Evosport Phenolic Spacers
AMG 80MM Throttle Body
LET DynoTune
K&N Air Filters
Custom Exhaust
Johnson CM30
Code3/Spearco Heat Exchanger
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Joined: Jun 2008
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From: Texas
2003 CL55
Yes it can. Go back and calculate the DA on the day you ran the 11.66 and then compare to now. As a very general rule, you will lose .10 per 1000 feet of increase in DA.
Barometric pressue and temp are the largest HP robbers, then I would say humidity.
Once you have a general ET on your car, know your DA, then you can generally pre-calcualte what your car will run before you even go to the track. That way, you can go to the track and have a good idea if you will beat your last time.. Of course, this also means knowing your car, same race weight and no major changes to the car.
Barometric pressue and temp are the largest HP robbers, then I would say humidity.
Once you have a general ET on your car, know your DA, then you can generally pre-calcualte what your car will run before you even go to the track. That way, you can go to the track and have a good idea if you will beat your last time.. Of course, this also means knowing your car, same race weight and no major changes to the car.
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E63 Biturbo, UPD Cold Air induction kit, UPD performance crank pulley and UPD adjustable rear suspension with ride height adjustment.
CL55 UPD Cold Air Boost kit, UPD 3000 stall converter, UPD 77mm SC clutched pulley and beltwrap kit, Custom long tubes, UPD crank pulley , UPD suspension kit, UPD SC pulley, Aux. HE, Trunk tank w/rule 2000 pump, Mezeire pump, UPD 5pc idler set, Aluminum rotor hats.
www.ultimatepd.com
instagram @ultimate_pd
facebook.com/ultimatepd
Out Of Control!!
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haters crazy
What conditions were your previous best run in? Have you checked your intercooler pump to make sure its working? If you are running in bad conditions I recommend icing down the blower before a pass. If your pump is wired to always run with the ignition on I would let it cycle a few times with the ice on the charger. If you have an ice reservoir even better.
Senior Member
Joined: Oct 2008
Posts: 441
Likes: 57
E550
Yes it can.
Go to weatherunderground.com get the stats for yest at the time you ran and enter it here
http://www.modulardepot.com/?show=density
Go to weatherunderground.com get the stats for yest at the time you ran and enter it here
http://www.modulardepot.com/?show=density
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Joined: Jun 2008
Posts: 3,834
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From: Texas
2003 CL55
Bottom line,, If you run in a worse DA than your best ET,,, then you will be highly prone to have a worse ET. Unless you add more HP!
Why does the ECU pull timing aggressivley?? Simple ,, he ran in Frickin horrid heat!! That is all part of a high DA, heat and engine management adjusting to heat..
If you do not watch the DA, then you will never have a baseline on your runs or cars power. You end up just guessing, wasting gas and tires. Then feeling bad/confussed about how your car ran..
Forget the weather correction calculators, the ECU may pull the timing more aggressively. The DA correction calculators can not take that into account.
If you do not watch the DA, then you will never have a baseline on your runs or cars power. You end up just guessing, wasting gas and tires. Then feeling bad/confussed about how your car ran..
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From: Maryland
'14 E63S & '14 Audi SQ5
Bottom line,, If you run in a worse DA than your best ET,,, then you will be highly prone to have a worse ET. Unless you add more HP!
Why does the ECU pull timing aggressivley?? Simple ,, he ran in Frickin horrid heat!! That is all part of a high DA, heat and engine management adjusting to heat..
If you do not watch the DA, then you will never have a baseline on your runs or cars power. You end up just guessing, wasting gas and tires. Then feeling bad/confussed about how your car ran..
Why does the ECU pull timing aggressivley?? Simple ,, he ran in Frickin horrid heat!! That is all part of a high DA, heat and engine management adjusting to heat..
If you do not watch the DA, then you will never have a baseline on your runs or cars power. You end up just guessing, wasting gas and tires. Then feeling bad/confussed about how your car ran..
Tom
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Thread Starter
MBWorld Fanatic!
Joined: Jul 2008
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From: Philly
997TT, C192 GT63, W464 G550, MS Plaid
What conditions were your previous best run in? Have you checked your intercooler pump to make sure its working? If you are running in bad conditions I recommend icing down the blower before a pass. If your pump is wired to always run with the ignition on I would let it cycle a few times with the ice on the charger. If you have an ice reservoir even better.
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From: SoCal
W221
Thread Starter
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From: Philly
997TT, C192 GT63, W464 G550, MS Plaid
on a positive note i was testing an intake setup for 2 of the runs that gave me a a 114 and 115 mph traps.
.8-1.5mph higher then without it
.8-1.5mph higher then without it
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From: Delran, NJ
05 C55
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2006 E55 AMG
. Prodigy, I just recently witnessed how DA affect our cars...it was ugly. On average it seems I lost a little more than a tenth and little over 2 mph per 1000 feet. The differenc in DA between my PB and Fontan was around 3000 feet. It was great to experience how DA affect our cars but I'm pretty sure I won't be doing that again. 105 degrees kills the brain after long periods of time
.
MBWorld Fanatic!
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2006 E55 AMG
What conditions were your previous best run in? Have you checked your intercooler pump to make sure its working? If you are running in bad conditions I recommend icing down the blower before a pass. If your pump is wired to always run with the ignition on I would let it cycle a few times with the ice on the charger. If you have an ice reservoir even better.
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From: Glendale Arizona
C55,SL55,C63
anything for a 10th i guess.I use to run my IC pump when my car was off to keep things at a less then stupid hot temp. That back fired when Chiromikey had to jump start me in the staging lanes. wont be doing that again.
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From: Philadelphia, PA
2008 A8L, 2002 996TT X50, 2009 X5
to this comment, then I remembered that you have an IC pump that could drain someone's pool for them - guess that sucker draws some current, eh? 
Thread Starter
MBWorld Fanatic!
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From: Philly
997TT, C192 GT63, W464 G550, MS Plaid
I think it only helps to make a wet mess. It doesn't take long once you start your car for everything to get hot. People do it though, from blown Mustangs to Mercedes. Maybe it does work anything for a 10th i guess.
I use to run my IC pump when my car was off to keep things at a less then stupid hot temp. That back fired when Chiromikey had to jump start me in the staging lanes. wont be doing that again.
anything for a 10th i guess.I use to run my IC pump when my car was off to keep things at a less then stupid hot temp. That back fired when Chiromikey had to jump start me in the staging lanes. wont be doing that again.
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2005 E55
I think it only helps to make a wet mess. It doesn't take long once you start your car for everything to get hot. People do it though, from blown Mustangs to Mercedes. Maybe it does work anything for a 10th i guess.
I use to run my IC pump when my car was off to keep things at a less then stupid hot temp. That back fired when Chiromikey had to jump start me in the staging lanes. wont be doing that again.
anything for a 10th i guess.I use to run my IC pump when my car was off to keep things at a less then stupid hot temp. That back fired when Chiromikey had to jump start me in the staging lanes. wont be doing that again.
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From: Houston/ Austin /Toronto / UAE / Minneapolis / Orlando /Cincinnati
Eurocharged Performance ML63 and TT lambo
in the midwest on track days, its actually odd to see someone not doing this...
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haters crazy
It does help. Let it sit for a bit til the charger is cool and cycle the fluid using the intercooler pump. I put the ice bags in another bag to prevent a wet mess. I dont have an ice reservoir installed so this is as close as I get. Its been proven that the ice resrvoir works. Think about it, cooler IATs and less heat soak. I can hot lap the car and not lose mph but if I let it sit in the lanes it quickly gets heat soaked.
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From: Glendale Arizona
C55,SL55,C63
