[BlackedOut04GT]

Well I have been trying to get my 1/4 miles times down from a 14.617sec @96.03mph with a 2.159sec 60'. I have a JLT True cold air intake, MGW short shifter, Nitto 555 tires (front and rear). I got a pair of Nitto 555R's but couldn't get a good launch out of them. What PSI should I be running and what RPMs should i be trying to launch at?

P.S. I am buying Richmond 4.10 gears with a Predattor Tuner in the next 4 weeks.

[01gtMustang132]

I've leave out at 4000 just driving out hard not popping the clutch...

(13.51 on 315/35/17 NT555R,4.10,PREDATOR 93 octane tune)

[product1620]

what psi are you running now? I'd start out with 28psi and work my way down until they start grabing, it might take some playing around to figure out what works best.

[casper gt]

hoosier quick time pro's or full slicks are best for stick cars. once you get the 4.10s & tuner you'll have your hands full with nitto's ( they do work very well on auto cars thuogh). do your self a favor & throw new clutches in your trac-loc while its, out cheap insurance.

[01GT4.6]

on 17" nittos with 21.5 psi I got a 1.60 60', launching at 3800 (with a slight bog). I did probably about a 4-5 second burnout. Suspension helps a lot though.

[usafimj]

Not sure on the tire psi but you should try finding your sweet spot going in 250-500rpm increments. Mine is at 2500rpms. If I try at 3K I'll spin to much. Once you find the rpms where you'll get more potential then work on your clutch foot work. Just my 2 cents.

[BlackedOut04GT]

i had just had the tires put on my old stock rims and found that they had 40psi in them after my first run. dropped them down to about 19psi, and was bogging off the line for the next runs.

[BlackedOut04GT]

The 4.10 gears and tuner will not being put in and done until the spring.

[Whitehorse]

I try to launch right about 3500. I usually catch a tiny bit of spin but it's about the best way I have found so far. Of course that is when I remember to turn off my traction control..... Last time out at the track I gave everyone a good laugh with that one and had a sweet 15sec run. haha I actually roled right out of the gate after that run and went home.

[adamo41188]

i had my bfg's down to 20 psi and i launched at 3500 and griped like a mother! just featherd it till grabbed and hammerd it and 13.8 for my stock GT

[TheUNZippee!]

Manual transmission shifting help.

I'll pass along what I have learned over a few years.

Before 10 people say it after I post this, let me say as a warning that all these methods are for racing, not day to day driving, and yes, they are hard on your car. It's hard on the clutch, the transmission, the rear end, U joints, and the engine. And that's assuming you don't blow a shift, which can be catastrophic.

Launching.

Okay. The first thing in racing is the launch. This depends greatly on your car & how much power it makes, what gears you have, what tires you have, and how sticky the track is. Atmospheric conditions also play a part in how your car runs. So even when you find your car's sweet spot, what worked one week for you may need adjusting another week or at another track.

The best launch is one where there is no wheel spin. Wheel spin = less forward movement. Try dropping your clutch at 2500 rpm. If the engine bogs down, you need a higher rpm launch. If you light the tires up, you need a lower rpm launch. Work your way up and down in 100 rpm increments until you find your car's sweet spot.
Sometimes, particularly in cars with lots of power, or in cars with an open differential (non-posi), or on a shitty track surface, you find that no matter where you dump the clutch, you spin the tires too much. In this case, sometimes you have to sidestep, or slip the clutch on the launch. This means slowly letting the clutch out as you roll on to the throttle to launch as hard as you can but without spinning the tires.

Shifting.

The best result for racing is power shifting. It sounds easy in principle, but it takes concentration, as a blown shift can be disastrous, especially if you are running a car with no rev limiter.

To perform a power shift, you keep your right foot on the accelerator pedal during the shift. When it's time to shift, keep the accelerator wide open. With your left foot, you stab the clutch in one quick motion, down and up, moving the shifter to the next gear as your leg is descending & disengaging the clutch. The clutch is only disengaged for a split second, just enough for you to ram it in to the next gear.

How do you know at what rpm to make the power shift? Again, this depends on the car. The reason you power shift is the quicker shift helps keep the rpm up higher where the power is. So this is also a trial & error thing, and takes you getting to know your car. If you are driving a typical Mustang GT that makes it's peak horsepower around 5700 rpm, stab the clutch right at 5700 rpm. Pay attention. If you do it right, the rpm should jump up just shy of your rev limiter, and then when the clutch re-engages, your rpm will still be right where all the horsepower is. Sometimes you're better off making the shift a little sooner in the rpm range, sometimes a little higher. If you bounce it off the rev limiter, you've made the shift too late, or at too high an rpm. You have to work at it until you get the best result for your car.


p.s. breaking shit is cool.

[jivepepper]

I run my 17 dr's to 17-18 psi

[chefalan23]

i have to launch at 2500 rpm otherwise ill blow my tires off

[01GT4.6]

wow I thought for sure that someone would have thrown up the bs flag on my previous post

[MustangMatt96GT]

only cause i know you have suspension can i beleive it...

Do you believe im just on drag springs and coil overs in my car?

[01gtMustang132]

I run my tires at 40 psi always ...
If the track is prepped good I get some 1.90 60's...(4000 drive out)

[01GT4.6]

Originally Posted by MustangMatt96GT only cause i know you have suspension can i beleive it... Do you believe im just on drag springs and coil overs in my car?

lol, I have no idea what you have for suspension. But drag springs and coil overs is a nice setup, so if that's what you have then that's awesome. I wish I had coil overs

[jivepepper]

Originally Posted by 01gtMustang132 I run my tires at 40 psi always ... If the track is prepped good I get some 1.90 60's...(4000 drive out)

You mean the front tires?

[Grabber523]

I ran my MT e.t. streets at 15 pounds yesterday, heated them up REAL good first, launched between 3000-3500 (depending on how the track was hooking throughout the day) and cut 1.8's all day on a shitty-prepped track for "street legal drag". 15 psi is a little low on the left side though, because all the load on the launch was on the left tire, and it spun the tire on the rim about 3" by the end of the day. Next year I'll have to bump it up to 16-17 psi so the tire and rim stay put in relation to each other.

[mystang0673]

ran my 315 nittos at 16lbs the other day and was bogging from a 4k launch... i keep about 25lbs all the time on back... lower to 16 at track. i can feel the wall wrinkle when they that low. lets me know they hookin. lol