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post #1 of 8 (permalink) Old 11-27-2006, 11:16 PM Thread Starter
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Launching with the mz3...

My question is when im launching the car off the start where should i be at as far as RPM, should i keep it at 4500RPM for best torque or keep it lower? I havent experimented but i want to see what you guiys say. I also raced a Nissan Spec V se-r on the highway from second gear (not shure my RPM but i think it was below 4500) Anyway i think he has more torque so he beat me in second gear but onc e we hit 3rd gear i kept up right behind him. Just wanted to let you guys know where we stand at, im driving a 2.0 2006
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post #2 of 8 (permalink) Old 11-27-2006, 11:22 PM
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Re: Launching with the mz3...

don't do burnout or launch the car if you value your engine mounts. The engine mounts on these cars are fairly fragile and if they fail it can lead to tranmission damage. keep that in mind

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post #3 of 8 (permalink) Old 11-28-2006, 01:03 AM
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Re: Launching with the mz3...

I have logged a bunch of hard launches and never had any problems with engine mounts.

You don't need to launch at a high RPM, feather the clutch and avoid wheel hop at all cost.
If you get wheel hop get out of it, that is what will break things.

Best thing to do is practice at the strip, what rpm you launch at will depend on how you feather the clutch. Just find what works best for you.

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post #4 of 8 (permalink) Old 11-28-2006, 02:08 AM Thread Starter
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Re: Launching with the mz3...

cool but what do you guys mean by wheel hop? is that when you dont meet the clutch and throttle correctly on an up shift and the car sort of shakes?
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post #5 of 8 (permalink) Old 11-28-2006, 07:42 AM
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Re: Launching with the mz3...

I used to be able to launch prett hard, but lately I've been experiencing more wheel hop on hard launches into traffic/heavy accelleration.

How would I know if I killed a motor mount?


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post #6 of 8 (permalink) Old 11-28-2006, 09:11 AM
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Re: Launching with the mz3...

if you're in to launching hard you might as well just pony up the moolah for some of bean's inserts or an awr mount. it will all but eiliminate wheel hop.

my main question is if i drop it at 4k rpm now and then to create some wheelspin, how hard is it on the clutch?

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post #7 of 8 (permalink) Old 11-28-2006, 02:49 PM
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Re: Launching with the mz3...

Then you probably haven't experience wheel hop before. Wheel hop is when a harmonic is reached with the motor in the mounts. What happens is when the tires are hammered hard on a launch is that they pull forward somewhat in the suspension and then the tires will break lose and snap backwards. This will cause the engine to twist forward (it just twisted backwards from the large application of torque you applied to it) lightening up on the tire load some and the tire regrab a slight amount of traction and surge forward some. The problem is this isn't confined to forward back motion, the suspension and elasticity of the tires converts a lot of this into up-down motion hoping the wheels along. Soft motor mounts contribute to this problem by allowing a lot of engine movement increasing the likely hood and amplitude of the wheel hoping. So stiff motor mounts reduce wheel hop.

Otherways to reduce it are stiffer dampers/shocks, a more progressive break away tire, and lower tire inflations.

Of course knowing how to launch your car is the most important way to reduce wheel hop. A perfect launch is when the tires are just barely slipping a tiny, tiny bit. This launch RPM, throttle, and tire inflation changes depending on temperature, road surface, tires on your car, if you have modified any suspension or motor mount components, etc.

Generally for a fast launch I slip the clutch holding the RPMs at about 3000. This is usually enough for a pretty hard launch. If I am going all out however I raise the RPMs to about 4200 and go to town, but you have to be a lot more careful about slipping the clutch at that engine speed or else you will be bouncing your tires all over the place.
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post #8 of 8 (permalink) Old 11-28-2006, 04:19 PM
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Re: Launching with the mz3...

I used to be able to do this. Now my tires are crap and can't hold the road. Step 1 to getting a good launch: decent tires. With my current (bald) set of Goodyear RSA's, I can all but sit there and spin all the way up to red line and never move an inch :-P


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