mthis

What's a good 1/2 mile trap speed for a non FI c63 with bolt ons
I hit 152.9 with bolt on mods and was wondering if it was good or bad.
Total weight of my car with driver just a tad under 3800#

jrcart

That sounds low, was it a standing or rolling start? There was a C63 coupe with just a Weistec tune at Shift Sector trapping at 151. My C BS was trapping 165-167 depending on the wind and the CLK 181 mph to put it in perspective. If you trap was a standing start that is a decent time, rolling it is a little slow.

mthis

Was from rolling 35-40mph

What u think is wrong ?

Tune is from Oe for ms109 made 465rw with 12.2 11.9 a/f

Merc63

Why so rich NA?

That's around what I am running with the blower.

With headers, I was running 13.0-13.2 WOT.

mthis

Beats me.
What should I be running NA

Merc63

Is that tuned specifically for MS109?

I think MS109 has a lower stoichiometric rating.

BAD430BENZ

i am around 11.9 with blower . i was also at 13.0 when n/a

jrcart

I would not jump right out and say anything is wrong. A few more questions have to be asked, was it flat, uphill, downhill? Windy, headwind or crosswind? My speed at Shift Sector were done with a 40 mph roll and only 2550ft, they factored our rolling take off area into the half. I would think you would be trapping over 155.

I am by no means a 1/2 mile expert, but I have run two of them in the past two months and I was pitted with most of the benzes running the events and saw and heard what most of them were trapping. I think a tune only CLS M157 tt was trapping at 157

Merc63

VP109 is 13.41

Ya it has a lower rating, so if that is tuned to run on MS109 strictly, you are about right on,maybe a tab bit rich..

But for pump gas, that tune is too rich for NA, IMO. Probably costing you some power.

jrcart

I was at 12.8-13.0 a/f when I was na and I had a wideband guage that I monitored frequently, 11.9 sounds a little off. You running a wideband? How are you figuring your a/f?

mthis

Yes Dyno tuned for ms109

mthis

Flat surface. Pocono raceway.
Head and cross winds that day
The track is up in the mountains so its got to be high in elevation

Merc63

Comparing your races to other races held half way across the country is pointless.

Its like us in Canada comparing 1/4 times to you guys racing in -600DA and a different track, it just isn't apples to apples.

All you can do is compare the same day at the same track, there is just way too many other variables to take into account.

For a perfect example, look at your signature, 10.9 in the 1/4, when we have the same car and pretty much same mods (before the blower), I was running my best of 11.8. You're almost a full second faster.

I bet I wont even hit 10.9 with the blower.

jrcart

Is your car stripped of weight? How are you at 3800 with driver? My car is over 4100 with me in it. I am sure the blower and ice tank add some weight but not 300 pounds. How much do you weigh, I am under 200.

mthis

I got a dashtaq with zentronic I think that's what it's called .
I got it connected to the exhaust and a display shows me what's going in.

emericr

I think it will be difficult to come to a "good number" and whether your number is good or bad.
The current conditions of that day will make it unique. You can come up with a range of saying 15Xish is in the ball park but I think that is about it.
I had a similar argument regarding the mile run. The event I did, it took at least 900rwhp to break 200mph and we were debating if a vette who clocked over 200 supposedly only had 700ish rwhp.
Your best way would be to compare other cars and the mods they had and what speed they achieved that day with you.
The rest is kinda speculation.

mthis

Hehehe. That's with the passanger seat in the car no less .
When I run the 1/4 with me in the car its under 3700lbs

Dads C63

I think you are fine. As its already been said it all depends on many factors and anything in the 150's is no slouch. Enjoy and be safe.

mthis

Cool tnx Keith.
How about the a/f anything u can say about that.

Dads C63

If that's what its tuned for then it should be good.

mthis

3910# stock weight with 1/4 gas and no tool kit or wheel.

Rotors,rims,hood, trunk, no rear seats, spacaro racing driver seat , no pass seat ,15lbs battery,
That's 320# plus some other things
I'm under 200 my self but above 175 lol

xtyper

Hagi, I think your results are right where they should be. I ran at the recent Shift S3ctor 1/2 mile event with the mods listed in my sig (full weight w/ 95 octane fuel) and consistently hit 151mph from a 40mph roll.

The stock C63 at the event was hitting high 130's, and the tune only C63 was doing 144-145.

Hope that makes you feel a bit better. Strong car you've got there for NA.

mthis

Thank you. I was hoping to hear from you on this topic .
It was my 1st time doing a 1/2 mile event so I dint know if its good or bad.
Anyway your 151 is strong for full weight , I'm 300# minus plus I have a tune for ms109.

NS_C63

@ jcart - what was the TT E63 trapping . The one with upgraded turbos?

jrcart

I think it went 167 but Steve or Mike from Weistec would have to confirm. All I know is that I was beating the Ewith my C at the No Fly Zone event in March by 3 cars in the 1/2 and then at the Shift Sector event in April the same E was beating me by 3 cars....they are obviously continuing to tweak that monster.