[Clap135]

Well I went to the track for the last test and tune of the year.

Problems right off the bat, I was on 225 45 18 blizzak ws70 snow tires in the rear and 225 40 18 dunlap 3d snow tires in the front.

Right from the start I knew I wasnt going to get any type of ETs with these tires so I was there mainly for trap speed and to test out traction control.

Got to the track, and inputed settings and went for 2 runs. I was trapping 110-111. I had zero traction 2.6-2.8 60 foot times lol. However I was wondering why my trap speed was soooo off. Well stupidy must have struck me cause I wanted to cap boost at 19 and run 17psi to start the autotune. Well I put in 17 in initial boost instead of 70 lmao, check the logs I was only runing 11.8 psi LMAO. Ok, put in the correct settings and got a 13.4 @ 117.5 as my best run with a 2.7 60. The more i spun the lower my trap speed got, so on that run i pretty much launched at idle, shifted to 2nd at 3k, landed in 2nd at 2.5k and floored it lmao. On the way i realized something HORRIBLE. My traction setting input was 15, if you read the beggining of the post, I am running two different (read incorrect sizes on front and rear) On the way home i felt constant surging while going 70 mph, car would go foward, stop go forwad stop, despite me not spinning, well this was caused to different wheel speed from the front and rear of the car and the procede traction control was turned on. Soooooo lmao I turned it off today by inputting 100 and the car RIPPPPSSS compared to the track.

I feel like an idiot however I still outtrapped every stock turbo n54 there. That 117+ trap with traction control dropping power throught the entire run was pretty damn good.

Mods:
dci
plm downpipes
ets fmic
meth
ms109.

I believing I could have gotten close to 120 if I realized the procede was robbing me of power despite me not actually spinning.

A fully bolted e92 m3 dct was there and only hitting 111 traps
Lost marine went 11.9 on drag at 121
Everyone else on street tires sucked.


That is all.

[dzenno]

11.9@121 for LM with RB twins? That sucks...

As for the traction threshold, I set mine to 20 for both maps...isn't it 20-30 recommended???

[Clap135]

Originally Posted by dzenno

11.9@121 for LM with RB twins? That sucks...

As for the traction threshold, I set mine to 20 for both maps...isn't it 20-30 recommended???

Yea it is, but the fact that I am running smaller tires in the front than rear (height wise) it complete throws off the procede traction control system because it thinks I am spinning. The stock tires on the car are roughly the same exact height. My rears were about 5 percent taller than they should be.... I didn't realize this would be a problem untill i noticed the surging driving home from the track. These blizzaks are very squirmy so when i doing the passes I was dancing all over the track and didnt even notice I was dropping power, I just thought it was the tires being balloons.

[Clap135]

I believe Steve (lostmarine) was running somewhere around 19psi on ms109 and meth. Like I said the track prep was horrible, he had a couple tranny shifting issues and what not but for the most part I thought he did ok. He was also running a jb4 and was there to pretty much log his runs, not to set records. Maybe go on n54 and ask him for the exact details as I wasnt really by him for most of the day. Everyone had some sort of issue. the jb guys were bogging, throwing codes, tranny issues. Themyst was having misfire problems (lol) and some other problems. Steve had traction and tranny issues i believe. I had stupidity problemes and that pretty much sums up the last test and tune of the year

[Clap135]

Originally Posted by maxnix

Never thought a drag strip was a track as in a racing track.

Dragging with snow tires doesn't seem very bright, either.

Yea well, they are rated to 118, I checked. So i was within spec lol. Not bright, but not the craziest thing I have done either. Plus it was last minute. My 265 summer tires go nowhere in this weather, the snow tires actually hooked up better.

another main reason for the shitty traction everyone delt with was due to the track using tons of water in the water box, being that you can't avoid the water box due to track design, this leaves shitty traction for all the street tire guys.

[lyndon_h]

Originally Posted by maxnix

Dragging with snow tires doesn't seem very bright, either.

There is a better way (more tactful) way to convey your thoughts. We Texans don't have to worry about installing snow tires like they do in the north. I'm sure he would have removed the snow tires and put on the performance tires if he was attempting to break records.

[lyndon_h]

^^^ started creating this post, took out the trash, then hit submit. Clap has already responded.

[Sniz]

Originally Posted by Clap135

Yea well, they are rated to 118, I checked. So i was within spec lol. Not bright, but not the craziest thing I have done either. Plus it was last minute. My 265 summer tires go nowhere in this weather, the snow tires actually hooked up better.

another main reason for the shitty traction everyone delt with was due to the track using tons of water in the water box, being that you can't avoid the water box due to track design, this leaves shitty traction for all the street tire guys.

I can attest to summer tires being horrible blow 45 deg or so.

I took my car out on Saturday, at 75mph in 3rd gear I hammered it to test traction and immediately went sideways, speedo hit 100mph, bounced the rev limiter and did not accelerate. No traction at all.

his snow tires were probably better than the 265 summer tires I have on right now.

[Clap135]

Originally Posted by lyndon_h

There is a better way (more tactful) way to convey your thoughts. We Texans don't have to worry about installing snow tires like they do in the north. I'm sure he would have removed the snow tires and put on the performance tires if he was attempting to break records.

Well i spoke with themyst the night prior to the morning track even because snow was starting to stick to the ground at my house, however the projected temps for the track day were going to be in the low 40s, which they were. Either way like I, and many other stated, the hankook v12 absolutly suck once the weather drops. I can spin from 40 starting in 3rd gear, around 70 it starts getting sideways. The tires seem to turn into pvc pipe. I think lostmarine has the same tires and he couldnt get faster than a 12.6 with them on lol, so he put on his drag radials and got down into the 1.8 range which still sucks, but like I said, no one was hooking up. The day ended with a 9 second s10 truck doing a complete 180 just after the 60 foot mark and catching on fire....the truck burned down to the ground and everybody pretty much called it a day. A month ago we had a cold front come in and atco raceway had an event, 3 crash, 1 driver lost his life when he lost traction mid track and crashed into the fall, flipping over the wall. Sad day.

[themyst]

Yep had misfire issues plague me later in the day while at the track. I am starting to think the meth wasn't working towards the end of the day as my ignition correction skyrocketed. Goes to show, don't run meth without a failsafe. Mine is at labonte awaiting replacement. My traps were going from 114 to 107 lol.

[Clap135]

Well i finished out the day with a 0.5 aggression level, so i def didnt have the same issues you did. You can't catch a break man.

[Clap135]

Well my buddy just talked to SHIV and the procede traction control does not monitor front wheel speed, so maybe my theory is flawed? Either way, then i turned off the procede traction control, my surging went away. Why? I dont know, maybe shiv can chime in a little more.

[OpenFlash]

Originally Posted by Clap135

Well my buddy just talked to SHIV and the procede traction control does not monitor front wheel speed, so maybe my theory is flawed? Either way, then i turned off the procede traction control, my surging went away. Why? I dont know, maybe shiv can chime in a little more.

Beats me But easy enough to datalog the cause of the surge by just datalogging throttle blade angle, applied throttle, ignition correction (which shows TC intervention) and ignition advance. Traction control intervention requires a few conditions that you wont see while cruising around. But it's a new feature so anything is possible at this early stage in the game. What I might do after the holidays is use a light on the dash to indicate Procede TC intervention.

Shiv

[Clap135]

Either way shiv i am disappointed, i FULLY expected to cut a 1.6 on 225 winter tires using your traction control system. Major fail my dude, MAJOR fail.

lol

[supracg]

haha send him some logs on these wheels and see if shiv can figure it out

[Clap135]

this is my winter set up, that turns the factory control system on if i simply switch lanes on the highway. It is totally my fault, i simply dont care cause the car wont be race for the next 3-4 months lol. It worked fine on my summer set up, which is sized correctly.

[OpenFlash]

Originally Posted by Clap135

this is my winter set up, that turns the factory control system on if i simply switch lanes on the highway. It is totally my fault, i simply dont care cause the car wont be race for the next 3-4 months lol. It worked fine on my summer set up, which is sized correctly.

I still wanna know though
... so send me those logs!

[Clap135]

Originally Posted by shiv@vishnu

I still wanna know though
... so send me those logs!

What exactly do you want to see? The surge crusing at a constant speed?

[Clap135]

Originally Posted by maxnix

Sorry if the truth hurts your namby-pamby feelings, jackwagon! But snow tires are not made to transfer a lot of power to a bare road.

Maybe he should have tried half-tracks at that temperature.

Half tracks? really? did you mis the part where the car didnt get off the line at all in the first 2 gears? The only time i hooked up and went was in 3rd and 4th.

Put it this way, my 1/8th mile was 86, my trap was 117

What car gains 31 in the back on stock trubos? lol not any n54 i know. It just shows you how screwed up the first half of hte track was.

[OpenFlash]

Originally Posted by Clap135

What exactly do you want to see? The surge crusing at a constant speed?

Yep... just datalog:

can dbw throttle
throttle
bank 1 afr
bank 2 afr
ignition correction
boost
dme ign advance
road speed

That should cover all the bases. We're bound to find the culprit and then figure out how it can possibly be caused by your ridiculous tire mismatch

[Clap135]

give me a day or so, im in the middle of planning my wedding, well not planning, but attending all the bullshit that my fiance has lined up lol. Quality time with the car is rather limited.

[Constant.S]

Originally Posted by Clap135

give me a day or so, im in the middle of planning my wedding, well not planning, but attending all the bullshit that my fiance has lined up lol. Quality time with the car is rather limited.

aww congrats man