siswati

Hi all

Heading to Moroso tonight. Ran for the first time last year, at this time and just did the stomp approach, running 12.5’s at 114mph.

Now want to try and improve my times with the feed-in approach. My beast is still bog standard. Any and all advice greatly appreciated.

I presume preload to about 1500-1800 RPM’s and roll off the line, feed in till the rear has set, and then floor it.

Are most of you running ESP on or off? Are any of you shifting manually with buttons or are you all in S mode?

How many of you drive through the water and do a burnout before your run? How many do not do a burnout?

I am running PS-2’s. Will inflate rears to 25psi , and fronts to 45psi, unless someone has a better proposition.

How much gas do you reccomend in the tank?

I look forward to reading your advice and comments

In anticipation
Siswati

X55

Experiment a couple of different ways to find out how your car reacts. Try 1) driving off the line, then 2) brake torquing at 1000, then 3) brake torquing at 1500, etc. until you find what the car likes to do. Try not flooring it, but giving the throttle progressively faster input as fast as you can. Imagine "squeezing" the throttle instead of "stomping". You may be surprised.

ESP off. Car in D - car shifting itself. I was never able to get a good result shifting myself and it seemed to confuse the trans more than anything. My best times were with the car doing all the work.

On street tires absolutely do not go thru the water box and do not back into the water box and do a burnout. Street tires do not need loads of heat like drag slicks do to achieve maximum traction. Your front tires going thru the water will roll a line of water all the way to the starting line, resulting in you launching on wet pavement if you do this. Drive around the box and launch as described above once you've staged.

Those numbers are about right. Street tires DO NOT like low pressures like slicks do!!!! Any lower than 25 psi and your tread will be cupping in the middle, reducing available traction. Slicks have soft sidewalls and the tread stays level when they go low pressure.

No more than 1/2 tank but no less than the amount required to keep the fuel pump from possibly starving so I'd say do no more than a few runs at the 1/4 tank level.

Give the car at least 20 minutes if not longer between runs to cool down - engine off, hood up. Even the naturally aspirated E55's like mine suffer from heat soak if you don't give them a break.

DJE55

Preload as much as your tires will stand but with PS2's you're probably better off just feathering it off the line with little preload. You'll need more air in the rears than 25psi. The 18" PS2's sidewall is too stiff to run that low of pressure. You will be using the outer edge of the tire and nothing in the middle if you run them that low. You will probably have to go up to about 30-32psi. Inflate the fronts to 48-50psi. I know that's a lot but it's not going to hurt. Keep ESP on. WIth the PS2's and cooler weather don't bother trying it with out ESP. I run a lot softer tire and I can't launch the car any better with ESP off. Stay out of the water and run with as little of gas in the tank as possible. Have fun and I hope you beat your old times. Good luck!

Jakpro1

Here it is....straight from the fastest stock E55 in the US's mouth. 11.84

(sidenote, elevation plays a MONSTER part in these cars....even if you are at 800-1000ft, don't expect housclass times my Benz brotha....)

launch...easy...by brother did it on his second try...

esp off...do burnout

esp back on

powerbrake to 1100

from 1200 to full throttle about 1 second...dont' flat foot it...that's how i got that 1.99

rear tires at 25 psi.

hrp is a killer track...i was the first one down the track with the 11.84...they vht'd the track then they draged it...as the night goes on, the track goes away...street tires kill the starting line.

john

WayneE

Here's how I've done it on my bone stock (including Conti tires) E55:

- ESP off
- tranny S mode
- manually downshift to first gear before launch
- let tranny upshift
- full tank of gas
- stock pressure up front/28psi in the rears


I do a short scrub of the tires to clean them off, just get the rocks and dirt and **** off. Roll up to the line and put the tranny in first gear. Light the stage bulbs. Now, the launch technique really depends on track prep - I don't preload and bring the revs up at all - if it's my first pass, I will just roll into the gas and see how the track hooks. You need to get to WOT in first gear as quickly as possible without blowing the tires away. If I hooked up, I get more aggressive with the throttle. I have been to a track that allowed me to absolutely flat foot it right off the line and run a couple of 1.77 60' times, dead hooking.

Good luck and remember to have fun

lbE55

This has worked best for me; except for what WayneE mentioned, sometimes I do better without powerbraking. My best 60' time is 1.87 on PS2s. Try different things and find out what works best for you.

siswati

This is good stuff guys - great that there are so many different approaches - and yup I will be experimenting. Really appreciate the response so far
Anyone with other advice?
Siswati

WayneE

IMO, unless you have a 3000+ rpm stall speed in your converter and a MONSTER cooler, you're just putting a bunch of heat into the tranny by loading up the converter at the line.

With all the tq in the E55, you can flash the converter higher by just hitting it from idle, rather than trying to push against it at the line. And for the modded cars, it will flash higher the more tq you throw at it. For example (making up these #s), a stock car may flash to 1400 with 516 ftlbs... but a pulley/ecu car with 575ft-lbs will see 1800-1900 from the stock converter.

Mad TKD

Does anyone have a time with a stock car with just Drag Radials. I bet the launch would be no problem. You would be able to pre load the car and just hold on.

pas

I agree with Wayne regarding gas, the more weight you can put over the rear wheels the better. When I have 4 people in the car the rears don't spin, when its just me they love to spin. The extra weight might make the car marginally slower, but by getting the power down soon you'll more than make up for it. These cars have enough torque where a few extra lbs won't make that big of a difference. IMHO

medici78

I'm thinking of heading out to thr track, except I have BFG Drag Radials. What PSI should I run?

Mad TKD

I seem to have had my best luck with about 18psi in BFG DRs

RobertG

Try putting a bag of ice on the intake manifold or intake runners

e55 baller

Setup: Stock + BFGs + 104 octane + 2K Density elevation + 32 psi (dumb)


What did/didn't work.

run #1

early at track with good VHT
1.84 12.2@114
5 sec burn out
ESP off entire time
stomp it from idle

run #2

2.3 short time 12.7@114

massive burn-out 30 seconds out using the water
ESP off entire time
stomp it from 1100rpms brake boosting
came out sideways for 30 feet until I hooked up late
32 psi


from the results of others you can see neither are optimal, one just much worse than the other....104 octane useless IMHO

Mad TKD

Yep you had way to much air in the tires. 15-18psi will be magic. Hopefully i will be able to test that soon.

Jakpro1

Okay, give it up Sis.....how'd you do? Let's see the goods?

Bet you tore um up!!

siswati

Hey Jak

youre safe dude - see my post on last nights attempt at https://mbworld.org/forums/showthrea...46#post1383746

Many thanks to all of you who posted your launch advice - I used it ALL - some worked for me and some didint, but I am improving (just a little) thanks to your help!

This is a really great board! No doubt about that!

Siwati

WayneE

e55 baller... where did you go? Are you running BFG DRs on stock 18s?

Next trip, start at 18psi hot (I'm assuming you drive to the track on your DRs). If you dead hook, you should be running in the mid-low 1.6x 60' range if you're aggressive enough with the throttle. If you spin, drop 1psi per pass, down to around 13-14psi.

Jakpro1

12.3......that's great!!!

Sounded like a blast. Must be fun going with other guys. Nothing like going to your local track and being the ONLY luxury car there......little weird.

pas

Hey Siswati what did you end up doing for fuel? Full tank or less and did you notice any effect?

siswati

Hey Pas

I ran the whole night with my fuel tank at around 5/8ths full. Next time I will run around 1/4 and see what happens.

A cold front is moving into FLL as I type, but it looks a though it will warm up before Wednesday, the 2nd last track day of the year. Hopefully it will linger a bit and I might get a chance to run with cold crisp air

Siswati

pas

when does Moroso shut down for the year?

I'm out of town again this week but I can go next week.

medici78

Elevation does seem to be a *****. I'm around 4k ft and my best so far on BFG DR's is only a 12.75, with very good conditions (well, for 4k feet)
Don't even ask about my times w/ the stock Contis.
My car felt way stronger when I first picked it up in Houston, 800 miles east and closer to sea level.