"All driving was done on a closed course with professional drivers"


I am aware that my 01TT is a 12.4 116 mph car and 04 E55 is a 12.5 117 mph car per R & T mag, so I was expecting a dead heat, but instead I could easily PULL the E55. The E55 was shocked. Every time I pulled him with ease.

Reason? - I have been running 100 Octane racing fuel for the past 6 months. This is the first chance I have been able to compare against a very similiar car and see the difference. Its the only thing I can think of as to why I had such an advantage....

Noticed my A/C was on the whole time!

Bond

 

ALRIGHT. my younger bro has an 05 55 and not only am i going to beat him but with a big fat promise

 

The higher octane does help; especially since your car's ECU has had a chance to really integrate it into the timing.

Nice job!

 

Very nice - 100 octane makes a huge difference, especially if you normally run 91. On my car we often see 100whp (yes, at the wheels) differences between 91 and 100. Of course that's for a custom 100 program, but 100 is awesome.

Now you need to flash your car with a GIAC race gas program and pull on the E55 like it was in reverse

 

run the mixed about 95ish octane on my GT3 SAT night i noticed the differecne as well. car pulls sure harder.

 

What is you altitude? Turbo's have no loss, but NA cars see about a 2-3% decrease per 1000 feet.

 

I have an E500, and even recognizing the improvements AMG does to the E55, I have a really hard time believing that it can run anywhere near a TT, particularly on a track. It's a tank!

 

the e55 isn't NA, its supercharged...would this make a difference at high altitude??

 

We were only 50 feet above sea level

 

would a higher octane really have any affect on hp without being propertly tuned for it? i suppose the higher octane would keep your car from detonating and pulling timing and thus making more power, but only if it was pulling timing and running badly from the start. high octane gas only keeps your fuel from igniting under pressure early and screwing up the timing of the spark. it doesn't contain any more power than normal fuel, only lets you run a higher compression in the cylinder before going BOOM. turbo cars run quite a bit of pressure since your forcing it into them.

is your car heavily modded or running more boost where it needed race gas? is this just something that 996 turbo porsches benifit from for some wierd reason? i know nothing about your car, so was just curious about the misconception of octane creating power without upping the boost or changing the characterists of the motor.

: )

 

I watched one run 12.35 sec @ 115ish mph (bone stock) at the track with my own eyes. They are very stout.

 

aaronlosey:

1/ Car is stock
2/ Gas is 91 in California
3/ Porsche requires 93
4/ ECU checks quality of fuel through knock sensors
5/ Stock ECU will continue to recalibrate via boost and/or timing for fuel quality beyond the minimum 93 for added power above the stock HP rating to a point (probably ~ 95)

By the way, does anyone know the HP I might be getting - I have heard that the stock non-x50 is actually 430 hp + 100 Oct (20~30hp?) = 450/460 hp?

Bond

 

Mr Bond:
I know you guys are "professional drivers", but I have to call BS on this. BS BS BS....Where can you find enough open road to "pull 60-140mph" not once, but several times on a Benz. If this is a track, where can you go up to 140?????????
Tell you what, when I am at a real track (RoadAtlanta), I can Barely hit 135+ on the back straight. The "pucker factor" at 135+ even on the track is huge for me. You guys must be very experienced and good at this!
Some guys on this board with their "kill" stories just amaze me.

 

Not sure if I understand you right, but 140mph is hardly a challenge for our Porsche or E55... it can get up to those speeds fairly quickly on any open stretch of highway. There are many on this board who have gone much deeper into the triple digits than 140.

 

I don't know. In my 'momentum car' C4S, I probably need no more than a mile of straightish road to go 60-140, and once you're there, it's pretty comfortable.

The pucker factor you speak of is a pretty personal thing. I'm well aware of the odds of surviving a 150mph crash, but at those speeds, the car is stable and composed, and so am I. I'm not going to go drifting at those speeds, but on a clear, dry day, on the right road, it's pretty undramatic. They're designed with continual autobahn use at those speeds in mind.

BTW, I've got a total of two PCA DE events to my name, so I'm a long way from being a 'real' driver.