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Old 10-02-2015, 02:09 PM   #1
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Advice on best 1/4

I am looking for some advice on getting my quarter mile times down using the best technique. I have a manual v6 and still consistently at 14 flat. My mods are steeda cai, mpt tune, Aluminum one piece, and the 3.55 gears

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Old 10-02-2015, 02:25 PM   #2
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Whats your trap speed
Whats your 60'
Where are you shifting
Have you checked the DA on the days you're running?
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Old 10-02-2015, 02:45 PM   #3
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Lower control arms and a good set of tires
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Old 10-02-2015, 02:52 PM   #4
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Here's some stuff to read on the subject...
http://www.hardtail.com/techtips/analizingtimeslip.html
EDIT: Actually this is for Bracket racing. It really doesn't entirely apply.
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Old 10-02-2015, 03:03 PM   #5
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Good link, nice stuff in there.
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Old 10-02-2015, 03:06 PM   #6
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Good link, nice stuff in there.
Well it's good for me who's trying to learn all this stuff. LOL
Not exactly what the op needs but gets him thinking.
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Old 10-02-2015, 03:09 PM   #7
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Originally Posted by Diehard View Post
Well it's good for me who's trying to learn all this stuff. LOL
Not exactly what the op needs but gets him thinking.
Hence, all the questions i asked lol, that link explains why i asked them.
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Old 10-02-2015, 03:10 PM   #8
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Quote:
Originally Posted by Diehard View Post
Here's some stuff to read on the subject...
http://www.hardtail.com/techtips/analizingtimeslip.html
EDIT: Actually this is for Bracket racing. It really doesn't entirely apply.
Interesting to read. Did not know you get better traction when the sun goes down.

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Old 10-02-2015, 03:12 PM   #9
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But does anyone have a recommendation for what rpms I should launch at with my 235 perllis?

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Old 10-02-2015, 03:13 PM   #10
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Originally Posted by Voltwings View Post
Hence, all the questions i asked lol, that link explains why i asked them.
Yeah my thoughts as well.
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Old 10-02-2015, 03:23 PM   #11
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Quote:
Originally Posted by Voltwings View Post
Whats your trap speed
Whats your 60'
Where are you shifting
Have you checked the DA on the days you're running?
OP start by answering these questions to see where you are deficient.
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Old 10-02-2015, 03:24 PM   #12
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Quote:
Originally Posted by Voltwings View Post
Whats your trap speed
Whats your 60'
Where are you shifting
Have you checked the DA on the days you're running?
Quote:
Originally Posted by mckhammer View Post
But does anyone have a recommendation for what rpms I should launch at with my 235 perllis?

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^^ Start there. Honestly, on 235 street tires on stock suspension you shouldnt be "launching" at all. I'd typically stage around 1500-2000 rpms, then slip the clutch for a second with about half throttle, then release the clutch completely and floor it. Was typically cutting around 2.0 60', which isnt great for street tires, but isnt terrible either.
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Old 10-02-2015, 03:30 PM   #13
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Quote:
Originally Posted by Voltwings View Post
Whats your trap speed
Whats your 60'
Where are you shifting
Have you checked the DA on the days you're running?
Trap speed is right around 95-100 with my 60' being 2.3-2.6. I do not know what DA stands for but the temperature has been 70 degres or below with the humidity being 60-70 percent

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Old 10-02-2015, 03:32 PM   #14
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It is a delicate balance between ever so slightly slipping the clutch to get a good launch with street tires.


You should be able to crack a 2.0 60' time which should net you at least a 13 second time slip. The rest will depend on suspension and tires and finally practice.
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Old 10-02-2015, 03:37 PM   #15
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Quote:
Originally Posted by smurf stang View Post
It is a delicate balance between ever so slightly slipping the clutch to get a good launch with street tires.


You should be able to crack a 2.0 60' time which should net you at least a 13 second time slip. The rest will depend on suspension and tires and finally practice.
Im not a very avid drag racer, but whats the general rule of thumb? .1 in the 60' is about .2 off the ET? Taking his 2.5 ish 60' down to about 2.0 works out to about a 13 second slip give or take. Sounds like its all in the launch, which is murdering your trap speed as well, i'd expect your car to be trapping at least 105


And DA is density altitude. Basically factors in things like height above sea level, the heat and humidity in the air ... a 9 second car at sea level may struggle to run mid 10s at 6000 feet you know. Obviously i pulled that example out of my ***, but you get the idea.
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Old 10-02-2015, 05:07 PM   #16
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My elevation is 700 ft above sea level approx. If anyone is familiar with summit raceway, that is where I am

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Old 10-02-2015, 05:08 PM   #17
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Quote:
Originally Posted by Voltwings View Post
^^ Start there. Honestly, on 235 street tires on stock suspension you shouldnt be "launching" at all. I'd typically stage around 1500-2000 rpms, then slip the clutch for a second with about half throttle, then release the clutch completely and floor it. Was typically cutting around 2.0 60', which isnt great for street tires, but isnt terrible either.
I'll be trying that tactic tonight. I'll let you know how it goes

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Old 10-02-2015, 05:17 PM   #18
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What am I doing wrong??? I launched this time at idle.

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Old 10-02-2015, 05:56 PM   #19
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My car has the 2.73's with a manual and I managed a 1.96 60' and ran a 13.6 @ 105.2 on the stock Pirellis.

I ran 35 PSI in all my tires (normal street driving), removed my spare tire and other junk. Completely disabled Advancetrak and traction control, that was it.

I launched my car around 3800 rpm, slipping the clutch nearly the entire way, no-lift shifted each gear and ended up with a time and trap that was very close to some of the Coyote drivers that were there.

It's all about skill and experience.

A launch is all about keeping wheel spin to a minimum and not letting the engine bog. The first 60' are really the most important. After that, just bang those gears and make a clean pass.

I would also think your car should be trapping a bit higher. What gear and RPM are you in when you go through the last trap?
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Old 10-02-2015, 08:07 PM   #20
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Quote:
Originally Posted by Ish416 View Post
My car has the 2.73's with a manual and I managed a 1.96 60' and ran a 13.6 @ 105.2 on the stock Pirellis.

I ran 35 PSI in all my tires (normal street driving), removed my spare tire and other junk. Completely disabled Advancetrak and traction control, that was it.

I launched my car around 3800 rpm, slipping the clutch nearly the entire way, no-lift shifted each gear and ended up with a time and trap that was very close to some of the Coyote drivers that were there.

It's all about skill and experience.

A launch is all about keeping wheel spin to a minimum and not letting the engine bog. The first 60' are really the most important. After that, just bang those gears and make a clean pass.

I would also think your car should be trapping a bit higher. What gear and RPM are you in when you go through the last trap?
Or just to add, what rpm are you shifting at in each gear? WIth your mods you're leaving an easy 5-7 mph on the table.
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Old 10-02-2015, 09:51 PM   #21
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I shifted around 7300 to 7500.
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Old 10-03-2015, 12:17 AM   #22
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I shifted around 7300 to 7500.

Uh isn't that way past red line lol


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Old 10-03-2015, 12:23 AM   #23
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Uh isn't that way past red line lol


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Slightly.
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Old 10-03-2015, 12:38 AM   #24
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Slightly.

I believe you shouldn't be shifting that high up. Someone else will chip into this thread soon but I believe that is way to late for shifts.


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Old 10-03-2015, 08:49 AM   #25
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I believe you shouldn't be shifting that high up. Someone else will chip into this thread soon but I believe that is way to late for shifts.


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Doesn't hurt anything but without long tubes and ported IMs definitely well into where the power starts to fall off. Shifting 71-7200 might yield better results.
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Old 10-04-2015, 12:47 AM   #26
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Advice on best 1/4

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Originally Posted by mariusvt View Post
Doesn't hurt anything but without long tubes and ported IMs definitely well into where the power starts to fall off. Shifting 71-7200 might yield better results.

Shifting that far up in the RPMs won't cause any damage?


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Old 10-04-2015, 12:55 AM   #27
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I get this inkling that he knows what he is doing lol
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Old 10-04-2015, 09:23 AM   #28
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Or just to add, what rpm are you shifting at in each gear? WIth your mods you're leaving an easy 5-7 mph on the table.
I am shifting between 6400-6800. On my gauges I have a shift light so its mostly spot on every time. When I get to the end of the track I'm in 4th at about 5800 rpm

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