ISF-88

How on earth do u guys get 12.385-12.5 qtr mile...I've been trying with my stock F and best I could do is 12.957@111.7mph on a Gtech Pro SS meter and i hit in the high 12's only this once..Car was in sport mode/vsc off using paddle shifts. I shift right after it beeps. Also my car had just over 3/4 tank of gas when I hit this time. Then 5 days later I tried again tonight but with a qtr tank of gas and kept hitting 13-13.1@109 mph...All these runs I've tried tq braking at 1500-2000 rpm. Only thing I was sastified with was my 0-60 time at 4.57.

First off tho I know these Gtech Pro meters may not be super accurate but when pitch level is set right then it's close enough within a few hundredths of a second. Also the drag strips haven't open up yet. Probabely will open in the next few months.

Another thing is my location is in the mountains located in Calgary, Alberta Canada. I was told that higher elevation will effect hp performance not giving it's full potential. Is it true about high elevation getting less hp and slower times out of cars?

Please fill me in with some knowledge and advice on how to improve my drag time.



Thanks,


Andy

MRxSLAYx

Ive only been to the track once and i was quick to notice that 60' and how you launched mad allot of difference.

Does the Gtech Pro record your 60' and 1/8th mile times? If so what are they?

caymandive

iTrader: (2)

The answer is simple. Weather and Density Altitude. Do some research on that and you'll find your answer. Also for reference check my drag strip journal in my sig.

J

ISF-88

It was pretty clear both nights, 1 night of being -1 degrees Calcius and 2nd night was 3 degrees calcius. I don't know density but our city's altitude is Elevation AMSL 3,557 ft / 1,084 m


60' ft time was 2.1XXX don't remember exact. Also have to check what my 1/8 time was. Also u say on how u launch meaning should i be spinning the tires before taking off? I researched on tq braking and it says not to spin the tires out before launching.

szechuan

maybe try and lower your 60' by dropping the tire pressure a couple pounds. they say every tenth off of your 60' is a tenth and a half off your total time. if you can get it down a tenth or 2 you will be right in that ball park

ISF-88

hmmm interesting. Never thought about lowering the tire pressure, good advice. Also my vsc wasn't fully turned off, I thought it was but i just researched just pressing it once will turn off only up to 20km. If I fully turn it off would it make a difference?

Juanca

iTrader: (5)

Turning VSC completely off will make a big difference. I don't know about lowering the tire pressure... I'd do it on 17" or 18" tires, but on the stock 19"s the sidewall is so small that I wouldn't risk it. When launching I hold it betweem 1200 and 1500 RPM, and I don't warm up the tires.

ISF-88

So when I turn VSC off completely and tq brake around same, should i floor it right after let going the brake or should i ease the throttle til i get traction?

When I did it before with VSC semi off I tq braked around 1500 rpm then let go the left foot off brake and punch it and my traction seems fine but traction control kicks in after 20km.

ToothDoc

You gotta do a burn out. No burn out = spinning 1st gear. Your trap speed of 111 is pretty good at such high altitude though. If you take off VDIM completely and you do a good burnout, you won't spin out at all (if the surface is clean). Brake torque or not, I see no difference. One of the things that might be getting you is the 1 foot rollout - does your GTech allow for a 1 foot rollout?

ISF-88

Sorry for being a noob but are u referring 1 ft roll as car moves 1 foot then the time starts? Anyhow if it is then I don't think so cuz once the car moves the Gtech will start timing...Also the Gtech will not start timing if tires are spinning. It will start the time once the car is actually moving and off.

ToothDoc

Even when the tires spin, the G tech starts because spinning = slow acceleration. 1 foot rollout is just that - the timers etc. don't start until after the first foot of going. At the drag strip, there is something called staging - where you setup before you go. Short staging gives you a full 1 foot rollout and deep staging gives you no rollout. Short staging gives you a quicker ET. Your G Tech might have something you can adjust in the parameters to allow for a 1 foot rollout.

ISF-88

I just read the Gtech Pro SS manual and yes there is a built in roll out of 12 inches(1 ft) There is no setting for it so I guess it starts timing after 1 ft factory default setting on the Gtech. I'm going to try again on Monday night. Will let u guys know how I do. Also my 60 ft time was 2.151 and my 1/8 mile time was 8.4XX forgot what trap speed was on the 1/8 mile. Hopefully I can experience a better time with VSC fully turned off.