I know quite a few guys run their cars at these places so wanted some advice.
1. What should tire pressures be before a run ? Say surface temps in 90s?
2. PSM on or off?
3. PDCC on or off?
4. Octane booster?
5. Fuel level in tank ?
6. Flaps up or down ?
7. Manual or auto mode in sport plus?
8. Advice for quicker reaction time
Many thanks !

 

1. Have to test what works best for your tires. I used 24 cold.
2. On
3. On
4. Race gas
5. 1/4 tank or less
6. Retracted.
7. Auto
8. Practice your timing. You have to let off the brake a little before the green light.

 

In our experience...
Tires in the low 30's cold
Driver aids off...they really hurt 1/4 mile
Agreed retracted, auto and practice

Feel free to reach out if I can be of any assistance

 

Yeah you're right. PSM definitely always off. Not sure if PDCC makes any difference.

 

A,
Try more tire pressure. It hurts your mile per hour and makes the car really Squirrley to go that low. These tires are designed for more pressure so if you don't have it to support the sidewall all the mechanical grip actually goes away.

 

My quarter mile set up

1. 26 PSI rear. 31 front.

2. If warm temps and prepped track PSM off. If cold unprepped track then PSM on.

3. PDCC off to allow for more weight transfer to the rear. In a half mile I turn it back in post launch.

4. Race gas (MS109/Torco 108/Sunoco 104).

5. 1/4 tank or less but never with fuel reserve light on.

6. Spoiler retracted.

7. Sport plus (but manually retract spiders and turn PDCC off) and launch control -- not manual use of paddles

8. Sidestep brake when light turns green rather than pulling back your left foot.

9. AC off

10. Windows closed

 

Thanks very much guys! Much appreciated !

 

Make sure you start your launch when 3rd yellow light goes;
BUT to avoid the false start, you need to approach the start line very slow and cautiously. You need immediately stop as soon as 1st Set lights are on instead of running over the start line
it will give you nice start without the false start
if your front wheels even a little over the start line my advice will not work


Best regards

 

Hi is there any update or additions to this thread that can help in a 1/4 setup?

Thanks

 

Try brake boosting the car in sport and spinning the tires some before staging. Make sure to remember to put the car back in sport plus and auto after that. You can't brake boost in sport plus as it goes into launch control automatically.

 

Hey William just curious are you doing this while driving in/through the water box? I assume you aren't but this got me thinking about your other thread for reasons you were launching worse at the drag strip vs the street.

Driving through the water isn't recommended with street tires because sometimes water can remain within the tire tread and carry forward to the launch pad and cause wheel spin at launch. Driving around the water box on these cars with street tires is the preferred method.

 

No I avoid it but on that second run, I picked up some water because I went on the wrong side of it so that is why I slipped. On the first run they hadn't even put any water down because we were first up. I brake boosted and got good tire spin so I felt I was set for a 1.6s or better 60ft but no luck there. I am pretty sure the problem with the boost happened near the end of that run because I sensed a loss in power around 126 mph but I didn't have the AP logging so I can't verify the sequence. The next run just totally freaked the car out because it was already failing to boost properly and I ran it like it should be.

 

Any adjustment to tyre pressure suggested for 1/2 mile run?

 

Do you want a higher terminal speed or a better launch? Also what tires do you have?

 

What would e gear do?