BlackHammer

Guys,
I was at the track this weekend. I don't even want to get into it but it prompted me to create this spreadsheet that compares Centerline's recent "10.5 Fest" and JoeJErnst who ran a solid 11.6. PM me and I will send you the spreadsheet (picture is below):

Some points of interest/surprises:

Almost identical better times by Centerline from 60' to 330', 330' to 1/8 mile, and 1/8 to the 1000' markers.

JoeJErnst had a higher MPH increase from the 1/8 to 1/4.

Looks like the key to a strong 1/4 time is a strong 1/8 mile (?)

Ruthle55

Whats the point of this? Seriously?

It's obvious 1 car is making more power or is lighter than the other. Also, 1 car cut a 60ft better by .2

BlackHammer

E-Z on me in this virtual world we are living in on this forum...The intent is not to bring down one guy and/or bring another one up. As a matter of fact I didn't use my time slips from over the weekend to showcase a few great runs from other cars (yes, different cars, different power, etc.) and not to make this about "me"...

You don't have all the history but I put this together after my trip to the strip this weekend. I am totally bummed out. My previous 2006 E55 (Stock) ran a 12.16 at 115 MPH. My new one (168mm pulley, tune, headers with cat-less downpipe, Fabtech H/E with engine bay tank) ran a whopping 12.39 at 116 with a best trap of the day of 117. My other mods in my signature are waiting to be installed. The slower than expected times is one things but the lower that expected traps is even a bigger bummer so I wanted to do some comparisons with other cars to see how mine was moving especially on top. A tenth here and there makes a huge difference.

So, searching for answers and trying to figure out what the heck is wrong (the net was I had some very poor 60' and 330' times). Also, I ran better than most of my "peers". A modded-up Coyote 5.0 was running 13.40's at 107 mph due to no traction.

The other piece is I thought the spreadsheet was interesting (and don't believe any one has posted it before) looking at the various times to distance and MPH stats.

I found it interesting how the slower ET (11.65) car speed increased by 26.11 MPH from 1/8 mile to 1/4 mile versus the faster ET (10.5) who's speed increased 22.93 MPH but covered the distance about a .42 second quicker.

Lots of physics that I don't understand and thought it would make for an interesting post/topic. I also thought folks would want the spreadsheet to put in comparisons of their runs versus others.

Hopefully this makes sense.

Ruthle55

You are trying to make a spread sheet on data that changes by the hour.

What were your IATs in your 2006 e55 during 1 run that trapped 116 vs this one?

What was the DA?

What was the tempature?

There is too many variables.

BlackHammer

This is great info. I don't have the data but Saturday was a perfect day. Temps in the 60's, some sun, with no humidity. The day I ran my 12.16 it was cool (60's) but damp. The track was also broke in and I got great 60' times (1.8 was the average).

I am like a beat up dog right now and trying to find some sanity in all this. Attached is another look of my best run of the day versus a C7 Z06 I ran (manual with drag radials). Both had similar starts to 330' then he went by me at half track like I was parked...

Maybe the best thing is for me to add more mods, get a LSD, and D/R's.
I should have my head examined also for being so spun-up on this!

Ruthle55

Whats your AFR?

Was your tank too hot raising IATs?

BTW, 168mm pulley only gives you like 1psi. Lets just say you get a bit of belt slip. That 1psi is gone.

Perfect weather, the car would probably go 118. 2mph of trap is a lot. You're forgetting these cars weigh like 4000lbs without a driver.

You have very minimal mods.

How did you launch the car? What settings did you use?

Too. Many. Variables.

Ruthle55

Dude, bone stock c7 z06s trap like 130. Of course hes going to freight train you. He back halfs probably 20mph more than you.

JoeJErnst

Are you running drag radials or street tires?

When you say "he went by me at half track like I was parked" makes me think your I/C pump may be dead. You need to log at least your IATs to see what's happening.

Ruthle55

That, on top of the fact that z06 had 8mph of trap on you....That is a TON.

kustom2k1

You need to log your runs/passes.

Hulk

^^^ this
Get some data logging equipment, zeitronix and dashdaq

Also it's no secret that the 1/8 is the key to the 1/4

JoeJErnst

That seems to be the best logging setup, but you can still get meaningful data from a less expensive setup. I use the Innovate Motorsports OT-2 and my cell phone to watch and log IATs, boost, and timing during my runs.

BlackHammer

Thanks for the replies and helping cope...
This is therapy that I need!

Here goes on the comments:

IAT's - A Fabtech H/E with Engine Bay tank was recently installed along with a new Mez pump. The water in the engine bay tank was bathtub warm after the runs so not sure if IAT's killed me.

"Not a lot of mods": K2 and a HE and Tank I agree. BUT, The car feels way way way faster than my stock one (not just my opinion)...

Tires: Brand New 275 Super Sports in the rear set at 25 PSI

Launch (I gave some advice recently on "launching" which makes me want to write a roast on ME). I did a break stand to 1,200 and immediately let off the gas with no added pressure on the acelerator. After the car starts rolling I mashed the gas. This didn't work so I reduced rev to 1,100 then applied less pressure, then down to 1,000 and eventually I think I was fully by the Tree before I mashed it. Every run I had the ESP holding me back. Maybe I should have turned it off...

10-4 on the Z06. But still, 117 trap and they went down all day to a low of 114 on my final run (12.59 run).

Hulk - Bow on the 11.04
Ruthle55 - Bow on the 11.4
JoeJErnst - Loved your runs and trap. I see you have altitude of 70. Mine was about 800 (Wisconsin). Could this be a difference maker?

Like I said the track was slick (apparently it was brand new). But still, not happy with the traps. A 1,045 HP Hellcat had a best of 11.1 of the day when I left (more like stormed out like a little Bia-tch)...

These are the mods sitting in the box:

84mm S/C Pulley
Belt Wrap Kit
82mm TB
550 Injectors
1-step colder plugs
VRP Intake
Eurocharged TCU
Eurocharged Tune

Ruthle55

I'm going to just say it.

Stop being such a cry baby.

You basically have a stock car with cooling mods. What do you expect?

BlackHammer

I literally Laughed Out Loud on this post. I am a big fan of "Tough Love" and this is it...

What did I expect? 11.90 @ 120 ish.

JoeJErnst. I see your signature you improved your times! Nice. Also, my theory on "Altitude" is out the window with a certain someone who runs at over 1,000'.

SilverStrk

Throw all the goodies on and have Jerry DO a Custom Dyno Tune.. Will make ALL the difference in the world after those parts are put on, Trust Me... Good Luck..

JoeJErnst

The density altitude on the day I ran was hovering around 850'. I don't have enough runs on my current setup to predict ETs based on DA, but last year I used this formula to dial in:

1/4 mile ET = .00009144*DA + 10.28 + predicted 60' time.

So on the day I ran 11.59 this year, I would have been running about 12.15 on last year's setup (hoosiers, PLM H/X, long tube headers). To get that extra 0.5 seconds I added 82mm TB, 77mm S/C pulley, ECU tune, TCU tune, and looped fuel rail.

If you care about your numbers, which apparently you do ;-) , you really need a set of drag radials and log IATs at a minimum. I would also highly recommend a weather station like the Kestrel 4250 so you know the actual weather conditions and DA when you run.

Hulk

Iat , timing and afr, those are the ones you really want to see.

For example on your tune day if you tuning and the tuner says he's seeing the commanded timing example 16* then when you goto the track and when you look at your logs if you see 12 or 10* timing then something is making the ecu pull timing, is it iat, is it afr, you will have a better understanding of what's going on. Da and drag radials will become your friend. Get drag radials that will help the 60' the 1/4 is all about the 1/8 so 60' is very important. Da is a b1tch or the goddess lol if you get negative da you will enjoy your runs, if you are in positive da sometimes better not even to run because you will be disappointed just saying

Good luck bro

Ruthle55

Some people also see a loss in trap with DRs. Just another factor.

Hulk

Yes Hoosier qtp will give less and so can the Mickey Thompson ET streets

Get Hoosier drag radials if you can

Rocman8

If you have the Fabtech Tank with the "newer" style lid then you are sucking in air and you IAT is rising about 100 degrees on a 1/4 mile. I've proved this on my tank and had to add a pickup tube in it.

BlackHammer

Thanks a ton for this info.

Is this the newer tank? See picture of the engine bay tank.




TK

Rocman8

Yup that's it. Fabtech claims there is no issue with it but now you are the 4th person found with this issue. Watch your temps and see them go sky high on a hard pull.

BlackHammer

I don't have any data logging equipment so I wouldn't have noticed. The water in the engine bay tank was always "bathtub warm" so I never would have thought twice. With this stated what is a "pickup tube" and do you have any information on where to get the part and how to install?

I did a search on this site and didn't find anything.

Thanks,
Tim

Rocman8

https://mbworld.org/forums/w211-amg/...ml#post6771392

Also any cheap obd tool will do just fine to check the intake temps if you want to check.