Zeebrock

I only have a stock C55 to go by but looking at your time slips I'd say you are trapping a little on the low side. Going by your 1/8th trap and power mods I would expect to see you trapping 110 - 111mph consistently. Rather than the 109mph you seem to be at. A good "guide" of power is the gain in mph from 1/8 to 1/4. A stock car does well to gain 20mph, some high performance cars can pull 22-23mph. I'd expect your car to be gaining 25mph. You are close to that so all is not bad. By the way the 1/8 - 1/4 trap speed removes the "driver error" as anyone can keep their foot planted on the gas, so its all down to conditions and the car.

John

My C55 stock best time slip, car 821.

Kevwood

Wow, that was a great race by the slip, neck and neck to the line. What was the other car?

Zeebrock

Audi S5, he got a great launch. I was still learning how to launch the C55

betrezra

Zee - I'm guessing data-logging Wideband O2 with that 1/4 mile pass will reveal some very rich conditions.

I would uncork that exhaust then put a tune on it.

91RS

Keep in mind that this was my first time ever at a drag strip, so some of the runs I was experimenting with different launch techniques and any of the runs over 12.9x the T/C cut the throttle off the line. One of the guys at work who is big into drag racing said with my speed I should be able to get around the 12.5 area with more practice (and possibly the limited slip should help).

Zeebrock

Your launch has nothing to do with the speed you gain over the last 1/8 that's why it's a good indication of performance. Like I said as long as your foot is on the floor until you cross the line then you could be a complete novice and still gain the same. Now your ET and trap speed is dependent on your launch and skil at the track. I agree you should be down in the mid 12s but that just need practice.

Nachtsturm

Here is a few of my runs for a comparison.

My car on my best run gained 26mph.

I did have a couple more runs, but one i used the shift paddles, and my time went horrible. Mid 13 at 105. My highest trap was 109 but with a worse 60', so et suffered.

Just curious, are you just leaving it in drive or are you using the paddles?

FYI, i was running without traction control on. With all the cars I have run at the trip, from an Mazdaspeed3, to a 2003 Mustang Cobra, I have always ran slower with it on.

91RS

I left it in drive sport mode but selected first gear (where it will still shift to the next gear at redline).

Nachtsturm

I would definitely get a tune if you haven't yet. If you get one from Eurocharged, they can tune it, then if you get headers, they will do a retune for free.

Zeebrock

I'm sure I could run 12's at 110mph at Byron, that track is like a Ski jump hill lol, I'm just joking! I run with the traction off in S mode. Tried it with the traction on and it kills the run. I'd like to get below 2.0s for my 60' I could see me running close to 12.9 if I could pull a 1.8s 60' Maybe I'll try it this year. I'll need new rear tires before the summer is done anyway!

Nachtsturm

I actually always run slower at Byron. All my best times seem to be at Great Lakes Dragway.

I am going to try to make it back to byron this sat. You should come out.

The look of the track is an optical illusion though.

91RS

Went to the track again last night, was kinda a last minute thing so no Quaife yet though. I tried it with the traction off for 5 of my 6 runs. First run was the best 12.777 @ 110.35mph. 60' was 2.035 and the 1/8 was 8.308 @ 86.79mph. I also ran a 12.838 @ 110.47 and a 12.827 @ 110.22. The other runs I was just testing different things to try and get a good launch. I'm going to get the Quaife in before the next time, the car likes to try and slide the rear end around when spinning tires so I should be able to get a much better burnout and launch. Finally verified the part numbers for the bearings so I'm going to order those this weekend.

loudandheard

Drag radials and a quaife and you should be mid 12's or lower.

Zeebrock

Thats more like it, consistent 110mph traps. It is possible to get sub 2.0 60' times on street tires (I haven't done it yet) that would get you close to a 12.5s 1/4 Maybe try lowering tire pressure into the high 20's that should give you a little more grip off the line. Great numbers though, keep us updated when you put the Quaife in. An LSD is next on my list.

John

91RS

I had thought about lowering my tire pressure, but I had no way to raise it back up after. I guess I could have gone to a gas station or something after. My buddy with the Cobalt SS lowered his slicks to 15psi and managed a 13.5 @ 110 (which is his best so far)!

loudandheard

Your car does not come with the emergency pump that the c32 comes with, need to check the wife's car.

Zeebrock

Did you check in your trunk? Don't you have the space saver spare. You should have the air compressor also, I thought all C55's came with them.

John

91RS

I might actually! I think I've only been under there once when I first bought the car.

91RS

I figured I would update this rather than start a new thread just for this. I've got the Kleemann headers on and the rest of the exhaust complete (see here: https://mbworld.org/forums/c32-amg-c...aust-done.html). I haven't been back to the dyno, but I managed to get out to the drag strip last Friday for the last test and tune night of the year and I'm pretty happy with the result! This was the first run. Every subsequent run was a hair slower than the last, they weren't prepping the track at all as the night went on. I had so much rubber stuck to my front tires and all in the wheel wells after the night was over. What a PITA to clean... Anyway, here's the time slip of that run. This is with Mickey Thompson ET Street Radial II tires in 245/40/18 on the stock C55 wheels. These tires actually cost me 2mph when I put them on due to the taller size but I couldn't find any 18" drag tires that were in the stock size.

Left is me and right is my buddy in the Cobalt SS.

AMG3.2

Nice, 12.25 is a solid time!

Quicktwinturbo

.004 R/T.. Holy batman.. lol

Is yours NA or S/C'd? Nice result!

GT-ER

You trapped 114 on street tires? Not bad at all honestly, but I doubt you'd still touch 400whp. My E55 had 429whp stock and it trapped 114mph while weighing 400lbs more and having longer gearing. I think maybe 380whp tops which isn't bad really, it IS a measly MP112 after all.

On my friends car I'm looking to touch 400whp but that's with a smaller pulley and lower compression ( more timing ) and he has the same exhaust setup you have.

91RS

I didn't run street tires with the new exhaust, it's pointless because it won't hook. I was trapping 110 before the exhaust on my street tires and it dropped to 108 after the taller tires. I put down 365hp at the wheels before the exhaust.

GT-ER

Oh, I thought you did since you said the drag radials dropped your traps by 2mph I thought you swapped them on those runs.

Dyno it and find out, but I doubt it'll touch 400whp.

Regardless, it's a quick as hell car. Enjoy it.

91RS

It better be at least 400whp or I will be VERY unhappy. I've already regretted buying this car and doing all this to it on a few occasions. I'm worried that it's going to nicke and dime to to death now. I just spent $200 for a belt tensioner to fix the rattle/squeaking it was making. My valve cover gaskets are leaking again. The heat exchanger I just noticed is leaking a few days ago. And I still have to tighten the fuel block banjo bolt on the secondary fuel pump under the hood every few weeks or it starts leaking fuel! What next?