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Old 10-18-2010, 03:00 PM   #1
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rpm launch help

okay so iam goin to the track on friday and i plain on running my car agian.. i seem to have trouble hooking up.. i usually luanch my car inbetween 2,000 and 2,500 rpm car usually spins through first and 3 quaters thru second... this is only alowwing me to run a 13.5 at 105.1 mph any tips
p.s tire have 20lbs in them and there "z" rated ultra high porformance with a soft rubber compound.
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Old 10-18-2010, 03:21 PM   #2
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Re: rpm launch help

My Mach 1 spins the tires durning 1st and 2nd. I have not put my stang on the track yet. I have plans to do it in two weeks. I let you know how I run to see if you are running good times.
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Old 10-18-2010, 03:26 PM   #3
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Re: rpm launch help

04machazblue-guessing you got manual tranny?
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Old 10-18-2010, 03:28 PM   #4
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Re: rpm launch help

yea sure do.. last time i ran it i had the stock clutch in, i recently just put in a RAM HDX clutch my self in the start of september.
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Old 10-18-2010, 04:43 PM   #5
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Re: rpm launch help

Might want to look for a set of drag slicks if you plan to run it at the track often.
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Old 10-18-2010, 04:54 PM   #6
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Re: rpm launch help

i don't think 13.5 is a bad time for a pretty much stock Mach 1 (i'm assuming). 04DSGM1 will be running an auto so it won't be an exact match for an idea on numbers. i believe the only thing he has is K&N air filter...

i agree buying a set of slicks would be a good idea if you plan on takin her to the track often.

the best way to find your best launch is to try and try again. learn the car.
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Old 10-18-2010, 05:04 PM   #7
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Re: rpm launch help

Every vechile is different. I know when I raced my truck on the track I would lauch at 2500 rpms. That was the best for my old truck. What I did was found a parking lot before going to the track the first time and just tryed different rpms.
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Old 10-18-2010, 05:06 PM   #8
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Re: rpm launch help

Right now all I have is the K&N air intake. So the car is almost stock. We will see how she runs in two weeks.
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Old 10-18-2010, 11:37 PM   #9
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Re: rpm launch help

20 psi is a bad idea for street tires. I have an old motor trend mag and they said how tires are designed to be optimum at reccommended pressures. Big burnouts are bad as well. Just spin them to clean the dust off and dry the water.

Street tires can become too tacky if you do a big burnout. Do not treat street tires like slicks. I see people do this at the track all the time and it's silly.
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Old 10-19-2010, 12:22 AM   #10
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Re: rpm launch help

ajpturbo is right 20 psi on your tires is very bad. You will tear them up very badly. Most Z rated tires wear quicker than normal tires. With the air pressure lower they will were uneven and faster. I think you should find rims (do not care what they look like) and put slicks on them, so you can change them out quickly (if you go to the track alot.) If you do not go to the track often then just run your stock tire with the right psi. Another option is to get wider rims and tires for everyday use. I used to have 10 inch tires on my old truck. It gave me great traction.
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Old 10-19-2010, 02:41 PM   #11
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Re: rpm launch help

yea i ran the tires at normel psi and didnt do better than 13.5 close but.... 04trv6 the car was completly stock at the time all i have now is slp 2.5'' pipes with dynomax mufflers... strange combo but i got them for $40 not to bad. and it sounds great thier dumped dont have that raspy noise, just real throaty iam getting a catless H-pipe
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Old 10-26-2010, 11:42 PM   #12
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Re: rpm launch help

Catlless H? its gonna be beastly loud
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Old 10-27-2010, 01:00 AM   #13
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Re: rpm launch help

I have a catless H-pipe on mine. it's not THAT loud
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Old 10-27-2010, 06:12 PM   #14
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Re: rpm launch help

Depends on what you have catback though Nate..

As for launching... 2500 RPM is ok, Maybe try around 2..

Slip the clutch! Don't just drop the hammer, you will definitely spin.. You want to be on the edge of wheelspin, maybe just a little spin.. But .. you can control it with the clutch..

I got a 1.9 60' out of street tires on my old 5.4 hatchback.. And regularly see 2.0 60's on the GT with street tires

If you're planning on flat shifting it (Holding the gas pedal to the floor) or even if you lift a bit... Best way to not miss a shift is to put pressure on the shift lever.. At WOT you won't pull it out of gear until the clutch goes in.. As soon as clutch goes in BAM it's in the next gear..

It's a lot of fun, play with the car see how it does - Practice makes perfect.
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Old 10-27-2010, 07:53 PM   #15
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Re: rpm launch help

Practice speed shifting but contrary to what others have said 20psi at the track for a few passes will offer you a beneficial gain on your traction. You should be able to come from about 3-3500 with a feathered clutch with enough practice. I used to mess with my buddies and a 2.03 what the best 60' I ever got
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Old 10-27-2010, 08:01 PM   #16
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Re: rpm launch help

Quote:
Originally Posted by MonteCitan View Post
As for launching... 2500 RPM is ok, Maybe try around 2..

If you're planning on flat shifting it (Holding the gas pedal to the floor) or even if you lift a bit... Best way to not miss a shift is to put pressure on the shift lever.. At WOT you won't pull it out of gear until the clutch goes in.. As soon as clutch goes in BAM it's in the next gear..

It's a lot of fun, play with the car see how it does - Practice makes perfect.
2 grand and you will bog.

Shift like this and you will leave your tranny at the 1/8 mile marker.

And when it goes "BAM" it might be a broken tranny and not the next gear.
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Old 10-27-2010, 08:12 PM   #17
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Re: rpm launch help

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Practice speed shifting but contrary to what others have said 20psi at the track for a few passes will offer you a beneficial gain on your traction.
If it's optimum to run 20 psi then you should do it all the time and not just at the track.

The foot print of the street tire is not as intended with lower than reccommended air pressure. The design of the tread blocks are not able to be utilized becuase of their deformed position to the road becuase of the low air pressure reducing traction.

People in street classes want to be like the big boys and do the same things but with different equipment it's so silly.
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Old 10-27-2010, 08:41 PM   #18
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Re: rpm launch help

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Originally Posted by ajpturbo View Post
If it's optimum to run 20 psi then you should do it all the time and not just at the track.

The foot print of the street tire is not as intended with lower than reccommended air pressure. The design of the tread blocks are not able to be utilized becuase of their deformed position to the road becuase of the low air pressure reducing traction.

People in street classes want to be like the big boys and do the same things but with different equipment it's so silly.
Trust me, I understand exactly what your saying and am completely on board, but it's redundant. These are the same manufactures that tell you to put the new tires on a front axle then years later tell us they belong on the non steering axle (rear). Paper Pushers can say what they want, but I have significantly lowered 60's with a drop in air pressure for street tires. While the footprint may not be designed for that use it still provides the extra effort of traction and friction that makes a difference.
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Old 10-27-2010, 10:52 PM   #19
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Re: rpm launch help

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Originally Posted by ajpturbo View Post
2 grand and you will bog.

Shift like this and you will leave your tranny at the 1/8 mile marker.

And when it goes "BAM" it might be a broken tranny and not the next gear.
Are youuu sure?

2k RPMs won't bog a 4.6 on street tires. You're slipping the clutch, not dumping it. The engine will rev and the car will move out with limited wheelspin. It will probably bog if you're on drag radials, street tires? not so much

And as for shifting.. If you're shifting fast/hard, it's better to hit the shift than to miss the shift and grind a gear by timing your hand moving the shifter to your foot hitting the clutch. The missed shifts are what destroys our transmissions.

This is just my experience, not saying I'm right.. I've never completely dropped a transmission out of the past 10 years drag racing manual trans cars.. Only one I damaged was due to a missed shift to third.


The above mentioned shifting is the same way my dad would run his car at the track.
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Old 10-28-2010, 05:05 AM   #20
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Re: rpm launch help

I've ran my car a few times on street tires. I get a significant gain in traction when dropping the pressure 5-10 lbs. I don't know that I would go to 20, start around 25 and go from there. Once you get a feel for it you'll know what both you and the car like.
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Old 11-11-2010, 07:57 PM   #21
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Re: rpm launch help

Hey 04machazblue I will be taking my Mach 1 to the track tomorrow night. We will see the difference in the auto and stand tranny. I will post my run times.
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Old 11-11-2010, 07:57 PM   #22
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Re: rpm launch help

Sorry I hoped to run the Mach 1 sooner.
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Old 11-12-2010, 12:46 PM   #23
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Re: rpm launch help

i also read out of a magazine that when you burnout on street tires it spins the oils in them to the surface.... idk if this is true or not though.
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Old 11-12-2010, 07:01 PM   #24
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Re: rpm launch help

Sorry man I will have to put it off another week. I re hurt my knee at work today. Just in to much pain right now.
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