E55_POWER

I guess no one can really say the E55 is "THIS FAST".

Spero ran consistent 12.6 @ 112, and I ran a consistent 12.2 @ 116 but I see some folks on the board here that are running 12.0x.

My 60 best time was 1.87 with a R/T of .530 yet I'm still pulling 12.2's.

Am I doning something wrong here?

I would have liked to hit 11's but truthfully I am happy with 12.2's in my family sedan!

skratch77

Your not doing anything wrong trust me your time is right were its supposed to be.There are so many variables at the track like

Temp,tire pressure,type of gas,driver and not all cars are made equal.

04E55 AMG

It seems that the Renntech mod gains you about .3 - .4 sec on the 1/4 mile.

MB Fanatic

A simple change of the pullies helps quite a bit too. Also some better tires like the PS2's from Michelin will also help with a better time.

Jon200

12.2s in stock form is very good for a family sedan

E55_POWER

But I have Renntech pulley and ECU. I also have 19x10 HRE 547R's with Michelin PS2's 275/30/19.

I noticed the Renntech does gain you about .3 to .4 to the 1/4 over stock.

Fikse

heavy wheels and tires won't help......

Jon200

my bad, didn't realize you had mods

enzom

What was the temperature at the track? Was it humid? Did you cool the car off between runs?

There are so many reasons why you may have "only" run a 12.2. I say "only" because there are very few things with 2 doors (forget 4) that can keep up with you. Be happy.

Stephen04E55

Do a density altitude calculation for the weather conditions(temp, barometric pressure, dew point, altitude of track) and that will give an indicator of how dense the air was on that particular day. A negative number will give the best hp due to the greater density of the air. At the same track, air temperature will give the greatest changes in air density. On my best stock runs the density altitude was negative and I was able to run the e.t. in my signature. I believe the DA that day was -500ft. I am not sure if there is a pure mathematical equation to do a "correction factor" for different DA values but it will give you an idea. In my experience on the best day vs the worst day for DA values your e.t. can vary +/- .4/4mph. Could be more in very extreme cases. Here is a link to input your data http://www.wahiduddin.net/calc/calc_da.htm
Also remember that your reaction time has no effect on your e.t. The clock starts when your car moves...not when the light turns green. You could have sat on the line after the light turns green for a minute and your e.t. would have been the same.

Vetluver

I think the most overlooked factor in drag racing is air quality. Cold dry air will make a lot more horsepower than hot wet air.

In addition I saw an article about how very small differences readings of air and engine sensors can change how much HP a Dinan BMW makes. Just putting a fan in front of the car on the dyno increased the HP by 10 to 20%.

My point is with the sophisticated puters and sensors on the cars today tiny differences can make big differences in peak HPs. The answer to more HP probably is custom adjustable engine software mapping according to the conditions. I think this a little much for a family car.

DerekFSU

FYI, R/T has nothing to do with your quarter time.

saber

this inconsistency is exactly why I add a cro2 system. It shoots co2 on the intercooler radiator and has freezing tubes in the air inlet tubes. When used it provides consistent times. I have found that by just increasing the pulley size results do not improve in any temps over 47 degrees. The increased boost makes the cooling problem much worse. It is a case of diminishing returns when you just add a pulley and ecu upgrade and do nothing about cooling.

Marcus Frost

This is what I have been saying all along, I made a post a while back that precisely addressed this point, but it seems people didn't really pay much attention to it.

-m

04E55 AMG

Seems that the new Stage 3 from EvoSport which is being currently tested should help with what Saber & MF have been saying.

On a side note, spoke to my MB Service Manager and he has no problem installing the new AMG LSD from Harris, since it is a complete swap out. The biggest difference between Kleemann and AMG is that one has a 60% lock and AMG has a 30% lock. Off course the obvious is that one is a AMG product that has been engineered by them for our cars.

Once you have all this extra power you need to be able to use it

enzom

Out of curiosity, what would it cost (parts and labor) to swap the stock rear for an LSD? Any ideas?

04E55 AMG

Labor is around $100/hr @ my dealership.

RossN

Can anyone breakdown what this means to the cars performance?

DerekFSU

Per Kleemann, their LSD is suppose to reduce 0-60 times by .3 seconds. I have no idea what the difference in lockout percentage would mean in real world driving.