1st time at the track, SUCKED!!! - Page 2 - Subaru WRX Forum
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#16 Old 04-08-2008, 07:15 PM
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thanks longshot for the info great to know.
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#17 Old 04-08-2008, 09:38 PM
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Quote:
Originally Posted by mosc View Post
memorization
+1 when your cruising around town just watch the tach when you shift. it is about 1000 rpms give or take some.

Robby
02 rex is gone.
I defected to an evo :)
Evo is gone :(
Now I got nothing.
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#18 Old 04-08-2008, 10:10 PM
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Quote:
Originally Posted by mosc View Post
memorization
Dude, you crack me up.Always so dry.Love it.

Tim "That Thangs Got Turbo?"
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#19 Old 04-09-2008, 12:39 AM
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Its because hes an engineer. All the schooling ruined his sense of humor and compassion.

Robby
02 rex is gone.
I defected to an evo :)
Evo is gone :(
Now I got nothing.
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#20 Old 04-09-2008, 01:44 AM
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Rofl:drofl:d

Tim "That Thangs Got Turbo?"
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#21 Old 04-10-2008, 10:00 AM
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Quote:
Originally Posted by mosc View Post
memorization
heh! This sure is a long topic...

Anyway, i was thinking of a way to precise things a little bit more... If you have the rpm drop between gears and depending on the power performance curve (hp/rpm & torgue/rpm) you could easilly figure out the optimum operational rpm range. Of course there will be "side effects" from the use of the clutch, from the quickness of the shifting movement, etc.

I have an idea how to measure the drop, but i'm interested to know if there is a useful and applicable math way of calculating it.
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#22 Old 04-10-2008, 11:06 AM
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gah fine, I'll pull out the math stick

You need the gear ratios and the final drive ratio and you can take any rpm in one gear and find out what speed that would be and then use that speed to find the rpm in the next gear.

However, I find this kind of silly because if you drive the car for a few minutes you'll quickly learn the points relative to your driving style which is much more valuable. Analyzing the gear ratios doesn't really account for the slow down of the car between shifts or the clutch buffer. Basically, my answer is memorization because you learn by feel as much as anything else what is smoothest and then you do that.

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#23 Old 12-20-2011, 09:04 AM
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Quote:
Originally Posted by Longshot View Post
He needs to read this:

"There are two things you need to accomplish to get a good launch in the wrx.
You need to launch under some boost,
and you need to control the load on the engine so it stays near max torque rpm for the first few feet without banging the clutch and shock loading the drive train.

There are several variations on the theme and each person will discribe it slightly differently but you want to engage the clutch quickly and smoothly so it slips just a bit with out just side stepping the clutch, or frying the clutch by holding it at partial engagement. The newer 2003 cars have a flow limit valve in the clutch line so you cannot just let up on the clutch and break things. It slows down the engagement just a bit. On the 2002's you'll have to do that yourself.

One of the top WRX drag racers in the country describes the technique where you stage, and then let the clutch out a bit until you can tell it is just ready to engage (the friction point) is just a fraction of an inch away.

Hold at a moderate fast rpm (everyone picks a slightly different number) I use about 3000 3500 rpm.

Now comes the key to launching under boost.

You can only build boost under no load conditions when the engine is accelerating at WOT .

Just as the second yellow comes on, stomp the throttle to the floor from your stage rpm, the engine will take about a second to rev to red line. There is only .500 seconds between each of the yellow lights.

Watch the tach and as the rpm swings by 5000-5500 rpm let up on the clutch quickly.
(you can't wait for the green light you have to start leaving on the last yellow)

Since you prepositioned the clutch right at the friction point there will be very little clutch motion, or shock, your engine will be very close to 5500 rpm when the clutch engages and under some boost because you floored the throttle a fraction of a second earlier. If you get all that coordinated you should have enough torque and energy stored in the flywheel so the engine does not bog.

Hang on !!! you will be accelerating at over 1 G and hit red line in low in about 1.5 seconds.
Be ready to shift !!!!!
The biggest time loss that keeps folks at 2.x seconds is a slow shift, you have to shift quickly to get back under power in second gear before you complete the first 60'.

Shift quickly and firmly but NOT VIOLENTLY !!! your not trying to break anything just be quick.


I tell folks to hold the shifter in their fingers not to grab it like a club, this gives you more feel and makes you less inclined to try to rip the shift knob off the console.


If you get it right its quite a ride."



I did not create this, it is pulled from another website, but it's a very good how to on launching a WRX. Enjoy.
I read and used this technique. Gave me a perfect launch. Each launch won't be the same, though, because you have to think quick.
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