Fastest way to launch a manual???


bmwboy
09-22-2005, 07:34 AM
when launching a manual one has to avoid wheel spin and bogging, so basically the perfect start within torque peak and without wheel spin is impossible? or is it... I have heard people talk about slipping the clutch so that you stay within power range and at the same time just about eliminate wheel spin (easier said than done) however i was thinking what happens if you find the rpm where you can let go the clutch (fast) just without wheelspin (probably around 3000rpm) just so that you chirp the tires then as soon as u start moving immediately press the clutch a second time to add alot of power to your start ( the idea would be that when already rolling its much more difficult to spin the wheels than from the start so u can add alot more power) so you have to press the clutch two times before the powershift to second gear... This technique is much easier to perform consistently...
Until now I have used this technique myself, because I never managed to execute the clutch slip correctly (it seems very hard on the clutch aswell) Has anyone tried this technique and if so can anyone tell me which one is faster???

travis712
09-25-2005, 10:18 AM
What car? What engine? A lot of torque or a 4 banger? More info..is it a bmw? You should be able to dump the clutch without bogging. Where your car peaks in torque, try leveling the RPMs out there, and dump the clutch. Or, just whatever works for you.

rice(er)
09-26-2005, 07:10 PM
two ways i launch my car is to slip it and get wheelspin, then it grips and off i go, second way is to balance the clutch and gas right in the middle for a couple secs, this gives me NO wheelspin and launches pretty good, but i can feel and tell that its pretty hard on my car, so like the guy above me said, you basically have to know your car, take it to the drag strip or something and test it out, i might be doing that later on to see which technique will give me a better 60 ft. time, etc etc

beef_bourito
09-26-2005, 08:08 PM
slippingthe clutch and getting no wheelspin isn't hard on the entire car, just on the clutch. it's actually better on the engine and rest of the tranny because there's no sudden jolt of torque being applied. that's, i believe, the way to ge the bes launch, rev up the engine to x rpm, let out the clutch fast but don't dump it and dont slip it too long, do this a couple of times and keep increasing the rpm untill you get spinning, then keep it just under the spinning rpm. this will kill your clutch very fast but will give you good times

BullShifter
09-27-2005, 10:54 PM
however i was thinking what happens if you find the rpm where you can let go the clutch (fast) just without wheelspin (probably around 3000rpm) just so that you chirp the tires then as soon as u start moving immediately press the clutch a second time to add alot of power to your start ( the idea would be that when already rolling its much more difficult to spin the wheels than from the start so u can add alot more power) so you have to press the clutch two times before the powershift to second gear

:screwy: :eek7: :grinno:

bmwboy
09-28-2005, 05:53 PM
Thanks for the responses everyone... its always good to share and work with different ideas

Chiquae07
10-23-2005, 06:12 PM
all that did was confuse me as well....

Kuntry_Boi06
10-26-2005, 07:39 AM
so really threre is no "quick" way to launch eliminating wheel spin that wont fuck this broke man's clutch?

AlmostStock
10-29-2005, 01:28 AM
if you find the rpm where you can let go the clutch (fast) just without wheelspin (probably around 3000rpm) just so that you chirp the tires then as soon as u start moving immediately press the clutch a second time to add alot of power to your start (the idea would be that when already rolling its much more difficult to spin the wheels than from the start so u can add alot more power) so you have to press the clutch two times before the powershift to second gear...

No drag racers ever do this. It might feel strong when you re-pop the clutch the second time but by then you've wasted too much time not under power with the clutch disengaged. From a dead stop try releasing the clutch at different rpms and rates. You want some tire spin. If you slip the clutch too long you'll burn it up and get crappy times. It's better to release it quicker (less than 1 second) and let the tires spin a little. Keep the motor in the power band and the tires almost fully hooking up!

2of9
10-31-2005, 03:25 PM
i think the best way would be first to know your car and i think the best way to launch your car is not to make the wheel spin, but a small chirp. Of all launches i've done, i've only done this once.

nismowu
11-01-2005, 11:28 PM
all that did was confuse me as well....

I think he's saying dumping the clutch twice for the 1st gear,
1st time to get the car moving
2nd time to get another boost, which he thinks should be
faster this way because the tires r rolling already, mininize wheel spinning.

I think the fastest way is to get both -
wheel spinning and clutch slipping,
if u do it right, both clutch and wheels will get the grip real quick.
it reduces the wear and prevents overheat on either of ur clutch or tires(unless u have racing tires).

that's how most of car magazines test their cars,
and their explanation is that car accelerates faster
when both tires and clutch fight for the friction

bmwboy
11-06-2005, 09:01 PM
very interesting... I have never thought of slipping both simoutaniously... this makes alot of sence... where did u read about the magazines testing the cars this way??? I always wondered how they do it, also in programms like "top gear" or "auto motor und sport"... it must be done by proffesionals who know how to do it properly... it would be nice if u can provide a link or some material on the topic :)

nismowu
11-08-2005, 04:07 AM
very interesting... I have never thought of slipping both simoutaniously... this makes alot of sence... where did u read about the magazines testing the cars this way??? I always wondered how they do it, also in programms like "top gear" or "auto motor und sport"... it must be done by proffesionals who know how to do it properly... it would be nice if u can provide a link or some material on the topic :)
http://www.caranddriver.com/article.asp?section_id=4&article_id=2509

CBFryman
01-08-2006, 03:00 PM
ummm...if you know how to drive you can regulate throttle and clutch slippage to get maximum traction (NO WHEEL SPIN).
For the best launch oy uwant to be right below the area where your wheels start to brake traction.

beef_bourito
01-08-2006, 03:05 PM
if you know the coeficient of friction between your tires and the racetrack, you can find the quickest theretical acceleration you can get. you want your tires to be right on the edge of slipping without it actually happening. so you rev up to a certain rpm, then let the clutch out quickly without dumping it. when you do this you want to let your clutch slip enough so that you don't spin your tires but not soo much that you accelerate slowly, the only way to get it perfectly is with practice.

TypeGs-R
02-08-2006, 08:25 PM
shit the way i launch my car is put it up at like 4 grand and dump the clutch

beef_bourito
02-08-2006, 09:12 PM
and that's why your wheels spin and you get crappy launches.

Chiquae07
02-08-2006, 09:57 PM
im with beef_burito on this one...but if u really wanna know where to launch, just rev your car in Neutral for awhile till it warms up, and slowly press on the gas...you will easilly be able to see where your tq curve picks up and launch right under that in order to get rid of the wheel spin, but just about the best launch...whats what i do. since my tq curve starts about 3k, i launch at 2800, a little chirp and pure traction...

beef_bourito
02-09-2006, 12:57 AM
actually, you dont want any chirp, that is lost traction, you want to be on the edge of losing traction all the time, that way you're accelerating at highest rae possible.

Chiquae07
02-09-2006, 01:42 AM
if i dont chirp, my engine bogs.....so its good to chirp for .1 of a second for me anyway....

50-shot
02-10-2006, 06:42 PM
i think your all wrong. i think getting your rev up to 4 grand means that your tires when u let go of the clutch will be doing about 20 mph so thats how you launch get up to speed faster. how u gonna get up to speed when u let your tires give a ltl chirp at like 2 grand

Chiquae07
02-11-2006, 01:20 AM
50-shot, this is also depending on your car. try launchin a mustang at 4000rpms...you wont get traction on street tires if i was to give u a million dollars. the point is to get as little wheel spin as possible, but not to eliminate it unless you have that kind of low-end tq. the spin is there to start to move a little bit quicker, but too much will hurt your times

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