I finally made it to a track this year and got to try out my 20" Nitto DRs. 36 psi with no burnout will yield half a track of smoke and a laugh from the box 20 psi with a decent burnout and I was sticking good. I didn't really worry about RT as I ran alone in Time Only in between the big dogs rounds. The best run I got was 12.52 @111.9 mph with a 1.77 60', out of 8 tries today. DA was 6741 and climbed all day...guy I was with had one of those handheld DA tools. My best run I was real soft out of the hole but the car took off great. The next 5 runs I had zero tire spin after small smokey burnouts and I just loaded the converter and nailed it...it felt like the car was holding back or something in first gear...all I did was a singlepush of the traction control so Mr. Squiggles was lit like I always do. I ran 12.8s all the rest of the day with 1.8 and 1.9 60' times and trapped at 110-112 mph every time. Anyone have any ideas? The third vid in the red and white Firebird is the dude that put my current 426 together. He ran 8.64 to 8.69 every single time with virtually identical RTs. It's nice to have a friend with a portable shop in his giant trailer Anyway, earned a great sunburn and should be able to get 8 or 10 runs in tomorrow again. I'll load the laptop as a passenger and try to datalog. Thanks for looking! Best run: Best run vid: http://s152.photobucket.com/albums/...as 08-14-10/?action=view¤t=M2U00010.mp4 Typical runs most of the day: http://s152.photobucket.com/albums/...as 08-14-10/?action=view¤t=M2U00013.mp4 Why the smoke out of the left tailpipe on one of my first runs? http://s152.photobucket.com/albums/...as 08-14-10/?action=view¤t=M2U00006.mp4 Brian Leibee sick Firebird: http://s152.photobucket.com/albums/...as 08-14-10/?action=view¤t=M2U00008.mp4
If it was holding back in first, I would guess it was due to you only pressing the traction control button once. I would hold it down for 8 seconds and turn it off as much as possible. I would think it would greatly benefit the launch of the car.....
I thought that for a while, but in two different SRT Engineer sessions, two different SRT dudes said that for straight line racing there was no difference. Holding the traction control until the chime only allows more yaw and wheel angles before intervening or something like that. It just felt like I was starting off in molasses for a second. I was preloading the converter much harder though...I am still pretty new to this. On my best run I just pussy'd it out of the hole and it didn't feel like that. It was 20 degrees cooler though. I can use all of the pointers I can get!
I got fed up with my reaction times and "slow" Charger and got into autocross and roadcourses instead. When I did try drag-racing, I was always advised to "warm up the tires" before hand and to sort of roll your foot into the pedal instead of jumping on it. Sort of the car equivalent of squeeze instead of pull the trigger. Beyond that, I dunno. That big LX ass likes to take her time getting off the line.
Jon, Sorry to say, but the Engineers Chat session is all about what they can and can not say due to legal and liability reasons. There is a huge difference between the single push and 8 - 10 seconds push... Why don't you have Bob turn the TC off through CMR? Anyway, with the ever increasing DA, your PCM was also having a hard time adjusting itself. I get that on occasion up here. Thin air = heavy quick breathing. lol Not too bad of a day, though.
Well cool, I will try that tomorrow like you and Dave say. My intake was rippin' hot to the touch and my AITs were like 130 degrees F. After I started doing burnouts (I had to get the ok from the track guy as I was the only one with tread doing them and didn't want to piss off the heavy hitters) I could load the TC and just nail it out of the hole...no spin. My car just didn't seem to get going. Does the car try to protect the transmission on the 1-2 shift? If so I need that to go away Tam, I have to drive 4 hours to get to a 1/4 mile track...lol...I don't even KNOW where a road race track is
Yeah, my mom lives in Cheyenne and she tells me its not exactly LX friendly except maybe three months a year. Between the altitude and the climate of Mars. Good luck figuring it out though, just gotta keep trying it until you get it worked out and *knock on wood* you don't break something the second you get it worked out.
You got LSD don't you? If you spun the tires half way down the track your traction control isn't doing anything. I think you just need to learn what launch technique works works with that motor and TC. What rpm to stall to and how to nail the gas. If you are being held back it's going to be torque management in your tune and that's going to at shift points rather than launch. The Jeeps come stock with limited throttle in 1st. The LXs don't. What RPM are you stalling to, what RPM are you shift points set to and are you running stock rear end gears? It's only first gear where the RPMs are down that low right? The best time vid and the next one looked/sounded like good launches? About the smoke... that can't be a good thing. You were still completely in it and all the way down the track it starts blowing smoke all of a sudden? What's up with that? Your catch can overflowed right at that moment? Just can't be good. Does it do it regularly? Like maybe it gets hot enough by the time you get that far down the track, your lifters get a little longer? or your heads start leaking? or... just can't be good.
That was the only time I saw smoke in any of my runs. I am going to check the catch can today. I believe it was that run where I kicked it from 3rd to 4th and it shifted immediately...before it usually does at 6400. I got the '06 flash where I can't hold gears and it shifts anyway so I had been starting in "1." I was in it all the way.
This is what I was getting at with the shift points and first gear and where you're starting out from the stall rpm. (forgot to ask tire on the DRs so we'll just assume stock tire size -- 45 aspect ratio) Shifting at 6400 rpm in 1st will drop you into second at 3882 rpm (47.7 mph). Shifting at 6400 rpm in 2nd will drop you into third at 4123 rpm (78.2 mph). Shifting at 6400 rpm in 3rd will drop you into fourth at 4529 rpm (121.4 mph). So launch up to ~3900 rpm in 1st are the only time you'll see rpms under 3900. (approximations above dependent on tire size but you get the idea).
You got that right.. My car ran like it had 1000lbs holding it back even with the blower. I did a little light to light jaunt with a Plum Charger SRT last Sunday night on a back country road in Cheyenne off of Del Range somewhere.
Got 5 runs in today before I eliminated myself first round in Sportsman...only red light of the week-end and I ran a 12.56 on a 12.70 dial. OUT. So I wiped my windows and wrote "T/O" on them and ran some more in between heats FWIW, I held the TC disable button until it chimed...I could run 12.6s at will in the same DA as the day before, and I did NOT feel the same boggy feeling out of the hole. Hmmmmmmm. DA was 6700 and above all day. Corrected this gives me an 11.7 at ~119 mph. Does this sound about right? Here is my final practice before I eliminated myself: Reaction .08 60 ft 1.78 I ran a manual Camaro SS with a CAI and Catback exhaust...he was running 13.8s and 13.9s with 2.1+ 60s and trapping around 105 mph. You can hear him burn out before me and hear him scratch through 3rd gear next to me. (I also lost to him when I red-lighted next round...he also broke out. Total coincidence we ended up paired together again.) http://s152.photobucket.com/albums/...as 08-14-10/?action=view¤t=M2U00033.mp4
With that kind of DA, you're right about where you should be. Corrected is a little high on the MPH...With 1.6-1.7 60' and 115-117ish MPH you should be in the mid to high 11's with zero DA...MPH tells you about the HP you're producing, ET is more about driving skill/traction off the line. Good 60' is key. In such a high DA, you did very well...
LOL Dave. I have more vids and sent one to Bob Crespo at SVS. I can see brief puffs out of both sides every once in a while...it sure seems like a PCV issue. My catch can was 1/2 full when I checked it after I noticed the smoke in the first video. My engine builder was there with me in the red/white Firebird and looked at it...kind of scratched his head. My best 60 ft times were 1.75 or so. I could run 1.8s most of the time. http://s152.photobucket.com/albums/...as 08-14-10/?action=view¤t=M2U00015.mp4 Here is my buddy running yet another 8.64...guy is deadly. The Camaro's rotor came apart inside his distributor on launch... http://s152.photobucket.com/albums/...as 08-14-10/?action=view¤t=M2U00017.mp4
I didn't actually think it was the catch can overflowing. But something is coming from somewhere. I'd be less worried if it smoked all the time or maybe right when you let off it or at shift points or something like that.
I hear ya. It comes from both sides which I was actually glad to see. It acts like oil it getting into the intake. It definitely almost quit altogether when I emptied my catch can.
Just watched the vid for the first time...funny commentary from the wife. Jon, check your valve cover and make sure you didn't pinch the gasket when you installed. I know you've had them off a good bit recently. I had passenger side pinched a while back and never knew until my wife followed me somewhere and she said I had smoke coming out from passenger side tail pipe. While sitting still, and revving i couldn't duplicate it. I had the hood popped and was scratching my head when all the sudden a puff of white smoke came from the passenger side header...oil was dripping down from valve cover onto the header. While moving it would get pushed down under the car from the hood scoop, and released out the rear, looking like it came from tail pipe.
DA was 6700 and above all day. Corrected this gives me an 11.7 at ~119 mph. Does this sound about right? If thats your corrected time, then you are probably right where you should be. Im sure there is still room for improvement on the 60 fts.... but that DA is crazy........
