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zak
01-23-2009, 11:11 PM
I just got back from the track and I'm fairly disappointed in the times I got. I have a 325 with M3 drivetrain and an AA stage 1 setup @10psi. I make 280rwhp. I have 255/35s in the rear set at 30 psi. Tried launcing from 3k, 3.5k, and 4k. One of these times was at 3.5 and the other 4. Here are the times I got

R/T .834 .289
60' 2.258 2.333
330 6.205 6.236
1/8 9.284 9.312
1/8 et 81.16 81.12
1000 11.912 11.947
1/4 14.122 14.157
ET 101.30 102.42

Any ideas on what I was doing wrong?
:(

DADx2
01-24-2009, 01:28 AM
It looks like your tire pressure may be a little high. My best run was on my Toyo T1R's at 20 psi. I had a pretty decent 60' which was 1.85. It resulted in a 12.98 at 105mph. My rwhp was 338 at the time, so you should be able to ET close to mine. The trick is to slip the clutch just enough before spinning the tires.

Based on your mph, you should be able to get into the low 13's with a good 60ft.

jworms
01-24-2009, 01:47 AM
slow shifting? with 280rwhp you should be in the 13s, even with a 2.3 60 ft time. what track? elevation? conditions?

morerevsm3
01-24-2009, 02:23 AM
It looks like your tire pressure may be a little high. My best run was on my Toyo T1R's at 20 psi. I had a pretty decent 60' which was 1.85. It resulted in a 12.98 at 105mph. My rwhp was 338 at the time, so you should be able to ET close to mine. The trick is to slip the clutch just enough before spinning the tires.

Based on your mph, you should be able to get into the low 13's with a good 60ft.

what weight was your car on that run (with driver)?

DADx2
01-24-2009, 02:36 AM
what weight was your car on that run (with driver)?

I am not exactly sure. However, I did take out my sub box, the spare tire, everything in the glove box, loose change, floor mats, and had less than a quarter tank of fuel. Otherwise stock weight. I did not go as far as removing the back seat or anything. I would like to know what it truly weighed.

I weigh 200lbs if that helps.

zak
01-24-2009, 11:30 AM
Track is probably somewhere near sea level. It was about 40-50 degrees outside. In those two runs I banged the crap outta the gears, so it wasn't slow shifting. It didn't feel like I was losing lots of grip but I could have just been spinning them through 1st and 2nd.

jworms
01-24-2009, 01:39 PM
Track is probably somewhere near sea level. It was about 40-50 degrees outside. In those two runs I banged the crap outta the gears, so it wasn't slow shifting. It didn't feel like I was losing lots of grip but I could have just been spinning them through 1st and 2nd.
heavily slipping clutch maybe? with those conditions, there's really no reason you ran 14s if you're making that much power ...unless maybe you have a ton of extra weight in your car?? something is missing in this equation.

the other strange thing is that you're only gaining 21mph after the 1/8th which only involves one shift (unless you have different gearing?). there are guys making significantly less power doing the same thing and trapping around the same in the 1/8th. so from a roll, at ~81mph to a bit over 102mph, you would be equal with an N/A E36 M3 making less power??? something is up!

here's a perfect example of what i was talking about. this guy has a basic bolt-on N/A E36 M3 probably making around 230rwhp and he's trapping similarly to you:

I didn't know this thread was going on.. I'd like to add my times from a few years ago. They were in another thread but I guess that was taken over by this one.

1997 M3, 100% interior in minus the spare tire.

fan delete
UUC Underdrive pullies
Cosmos Racing 3” CAI
AA 3” track pipe
Edge Racing cat-back exhaust
Diffsonline.com 3.46 rear with 40% lockup
Jim Conforti “Shark” injector


Time:

13.450 @ 102 w/ 1.8 60' time was my best

Slip:
http://i192.photobucket.com/albums/z231/TheEstoril/13450102.jpg?t=1224640372

MrBlonde
01-25-2009, 03:36 AM
Your car doesn't make that much power.

zak
01-25-2009, 05:08 PM
Your car doesn't make that much power.

The car does make that much power. The clutch does not feel like it's slipping and shows no obvious signs of slipping. I am going to go back this week and try with some different tire pressures. When you guys go from 1st to 2nd do you dump the clutch and floor it, or feather it to control boost? Granted I am running not a whole lot of power, but I think I may be spinning all the way through 2nd.

bennyfizzle
01-25-2009, 09:10 PM
Apparently not..I trapped 102 in my bolt-on S52...trap speed is trap speed.

It doesn't lie, either you have a 4500lb m3 or there's something off there.

Apparently not..I trapped 102 in my bolt-on S52...trap speed is trap speed.

It doesn't lie, either you have a 4500lb m3 or there's something off there.

morerevsm3
01-25-2009, 10:59 PM
I am not exactly sure. However, I did take out my sub box, the spare tire, everything in the glove box, loose change, floor mats, and had less than a quarter tank of fuel. Otherwise stock weight. I did not go as far as removing the back seat or anything. I would like to know what it truly weighed.

I weigh 200lbs if that helps.

I am interested because I run almost identical ET and trap in mine, at 3174 Lb, and only 276 rwhp (dyno dynamics)

someguy2800
01-26-2009, 01:58 AM
you need to get your 60 foot in order before you can really start looking for faster times. I've seen worse but your 60 foot is pretty bad. For comparison my tow vehicle, a 6000 lb 180 hp diesel pickup has done a 2.3 60' in 2wd.

Before you go to the strip again take your car in a safe area somewhere and practice your launch through first gear over and over again until you get it right. Try holding the throttel in a fixed position (say half throttel for starts) and managing wheelspin just with the clutch. Then when you've mastered that you can start adding more throttel. Also if your having wheelspin in secound try going into secound gently instead of hammering the gear and dropping the clutch. It's mutch easier to control wheel spin if you never allow them to start spinning. When you go back you will be looking for at most a 2.0 60' time and if you can do that your times will drop drastically.

stanksbeamen
01-28-2009, 01:43 PM
Take a camera with you next time you go out and put it in your car or have a camera man to tape it. You must be spinning 1st and 2nd, what differential do you have in your car?

MikeE36
01-28-2009, 07:40 PM
Your car doesn't make that much power.


The car does make that much power. The clutch does not feel like it's slipping and shows no obvious signs of slipping. I am going to go back this week and try with some different tire pressures. When you guys go from 1st to 2nd do you dump the clutch and floor it, or feather it to control boost? Granted I am running not a whole lot of power, but I think I may be spinning all the way through 2nd.


You are absolutely NOT spinning all the way through 2nd gear with 280 whp unless you've got like 185 tires on there. I think you've got some underlying power issue as that trap speed is definitely too low.

swollix
01-29-2009, 01:51 AM
my N/A e36 traps 104....

DTM325PWR
01-30-2009, 05:13 AM
my N/A e36 traps 104....

i trapped 103 with my s50 powered 325. something is wrong

BadBoostedBmwM3
02-03-2009, 01:05 AM
At 280rwhp... you have a lot more left in the car. And, what does the car way with you?? I remember right don't you have a complete audio setup...


my N/A e36 traps 104....

True... but you are/were spinning real bad on street tire... with proper tires you will prolly slow down to 102 or 103.

zak
02-03-2009, 01:11 AM
At 280rwhp... you have a lot more left in the car. And, what does the car way with you?? I remember right don't you have a complete audio setup...



True... but you are/were spinning real bad on street tire... with proper tires you will prolly slow down to 102 or 103.


Nope no audio setup. Car weighs 3400 or so with me in it, I'm a lard ass. Went back to the track and basically figured out it was my lack of ability at driving. I had never gone to a track before, and this last time was the 2nd time around. This time I did:

2.198 60'
9.056 1/8
82.18 MPH 1/8
11.672 1000'
13.866 1/4
103.07 MPH 1/4

I didn't realize what I was doing with my left foot, most likely cause of adrenaline etc. That was the last run of the night, and I actually really slipped the clutch instead of slowly dumping it. Definately slow times because of my crappy driving/launch. Knowing what I know now I should be able to get into much lower 13's I still have alot to cover with the 60' time. However, the next time I go to the track I will probably be making much much more power. Atleast I will know better how to drive and will be looking into breaking into the 12s :redspot

m3boost
02-03-2009, 02:00 AM
[QUOTE=zak;15449876]Nope no audio setup. Car weighs 3400 or so with me in it, I'm a lard ass.

That's your problem.... have someone else drive it...

ptldM3
02-05-2009, 01:14 AM
Nope no audio setup. Car weighs 3400 or so with me in it, I'm a lard ass. Went back to the track and basically figured out it was my lack of ability at driving. I had never gone to a track before, and this last time was the 2nd time around. This time I did:

2.198 60'
9.056 1/8
82.18 MPH 1/8
11.672 1000'
13.866 1/4
103.07 MPH 1/4

I didn't realize what I was doing with my left foot, most likely cause of adrenaline etc. That was the last run of the night, and I actually really slipped the clutch instead of slowly dumping it. Definately slow times because of my crappy driving/launch. Knowing what I know now I should be able to get into much lower 13's I still have alot to cover with the 60' time. However, the next time I go to the track I will probably be making much much more power. Atleast I will know better how to drive and will be looking into breaking into the 12s :redspot
Not bad but your 1/8th should be quicker for 280whp, practice your shifting technique.