Guide to Road Racing

[Samol_hok]

http://www.elecdesign.com/Articles/A...6137/6137.html

here is an artical of double clutch in up about up shifting adown shifting stating less wear and tear

remember. you cant win the race if you dont cross the finish line.

[Ryan]

Oh god...This thread is officially Hijacked...

First off, please use some proper english...thrying to raed carp that is'nt speled rite is a apin in teh arse!!

Second...from your article...

Originally Posted by Your Article

But many trucks and some racing cars are still set up with a non-synchromesh gearbox. With trucks, because they have so many gears, it's noticeably more efficient not to have all of the gears in mesh all of the time. So with the "crash-box," you HAVE TO double-clutch, or you will not be able to shift. The same holds true for racing cars—to gain the last couple percent of efficiency, only one set of gears is in mesh at any time, and you have to actually synchronize their speeds or you can't get it in gear. Despite the obvious drawbacks of having to double-clutch, the gearbox is stronger and more efficient than a comparable synchromesh one, and has less tendency to overheat.

Last time I checked...our cars aren't race cars, nor trucks, nor do they have Crash Boxes in them....

Originally Posted by Your Article

Other reasons for double-clutching: Because it is the right way to operate the clutch.

If you've got a crash box, truck or race car as seen above, sure is!!

Originally Posted by Your Article

Because it saves wear and tear on your synchronizers in the long run, if you're planning to run your car over 200,000 miles

Guess what, even if you don't double clutch, just change your fluid once in a while and no problems. I've got a '89 MX6 GT that has over 240k on the original tranny, and guess what...It's the smoothest shifing car I own, always has been...Why? It's not abused, and gets maintained...and guess what else...NOBODY has EVERY bothered to double clutch it...

Originally Posted by Your Article

Because it is fun to do.

Yes, it is sometimes

Originally Posted by Your Article

Because in very cold weather, (-10° F, for example) you may have to double-clutch to shift gears at all, at least for the first few miles.

You live in -10° F weather? If you do, then you better have the proper fluid in your transmission, and still be easy on it the first few mins...and still no double clutching needed...

Originally Posted by Your Article

One very important reason is that, if your clutch linkage ever fails, you can still shift and get home by double-clutching, getting the engine and gears' speeds synchronized and then just EASING the shifter into the right gear.

Yeah, I kinda mentioned this already...it can also be done without a clutch at all...

Originally Posted by Your Article

Another reason is that on some old cars, first gear isn't synchromesh, so if you need to shift into first without coming to a full stop, you have to double-clutch. Also, a lot of cars these days are made with weak, chintzy synchros, so they soon wear out, and to drive them gracefully, you need to double-clutch.

In a hurry to get into 1st gear? If so then yes, you have to double clutch...if you don't have synchro's...but guess what...YOU DO!!! Granted double clutching will slip it in nicely, but again, on a race course your best and fastest bet is to simply rev-match...by the time you take the extra .3 second to pump the clutch you're already needing to be in gear and ready to accelerate...sounds nice, but doesn't always work so well...As for 'chintzy' newer car synchro's...See above about my 240k plus mileage MX6

And then to top it off, you're referencing a guy writing for an ELECTRONICS website?!?!

Dear god...at least bring someone with some automotive credentials to the table, granted he seems to fairly well know what he's talking about...but really now...How about I start spewing off about TV Tubes...Sure, I know how they work, taken them apart, blown them up, even sold televisions in a high end home theatre store, but do I claim to be an expert on their operation? No, I don't.

In summation...double clutching is NOT necessary, it WON'T hurt anything, it's just not necessary...and in MY experience, I've put well over 200k miles on variuos Mazda trannies, both first and second generation, and even a Ford Exploder with a Mazda transmission...I've broken them stuck them in gear, blown the cases apart, but even through all the racing, all the beating and grinding of gears has there been a synchro failure...No. Not one yet. And I rarely double clutch...



And furthermore, tell me this...do you Auto-X, Road Race, or do some other form of racing?



Laters
Ryan

[Samol_hok]

i go to sait for automotive service technology SAIT.ca

wasnt explaining it in clear automotive science enough or should i scan a diagram and hilight exactly what i mean about reducing torsional loading of a opposing forces

hmm lets see studying 1st period including metalurgy adn failure analysis

[parisifal]

Please stop.

Automotive science is right, double cluthing does save wear and tear. Real life is another story. The wear and tear is negligible. You are more likely to cause more damage with ONE misshift than saving by double clutching a synchromeshed transmission your whole life. Science said that the amount of dirt you breathe in is very unhealthy; but in real life you have to breathe, so you breathe.

If you wanted to put this info as a "ways to prolong the life of a transmission" I would approve. As this is a "racing" thread, double clutching does not help, matter of fact, only times it would help is if yout tranmission is about to go bye bye.

Go ask your instructor if double clutching is necessary on a modern day synchromeshed transmission. Also ask them if it helps anything that has to do with "racing."

So please Samol_hok, just stop.

[Samol_hok]

ok ok ok truce... keep doing what your doing just means full employment for automotive technicians

[Ryan]

Oh god...Give it up...how many of these cars have you owned? How many of these cars have you raced? How many of any car have you raced? How many transmissions have you replaced?

I've owned nearly 20 Mazda's in the last three years alone, most of which have been raced at one point or another...If you've got better proof to your side of the equation, please offer it up...because right now you're not convincing me and I sure as hell hope you're not convincing anybody else...



Laters
Ryan

[Feel the RuSh]

scandinavians flick is another way

[Magnumsrxt]

NOTE TO NEWBS:

Something as complex as auto-x can't be explained in words. Sure you can read all this stuff all you want, but don't think that just because you read this that you're the best auto-xer around. There's just too many factors. The only way to truly learn how to race your car is to actually race it. This post is just pointers.

If you want to read a guide, go read the blacktop. Nothing more educational then buying a bunch of cones and going to some huge abandoned parking lot and going through the curves.

[Ryan]

Oh, it can be explained in words...Tens of authors having writen hundreds of books on auto cross alone are doing it right now...unfortunately it is one of those subjects that is very hard to finish

/bringing up the dead...

Laters
Ryan

[68firebird]

I've owned nearly 20 Mazda's in the last three years alone, most of which have been raced at one point or another...

that alone should be enough reason to use his method, anyone who goes through nearly 20 cars in 3 years must be doing something wrong.

j/k no personal attack meant.

[Ryan]

Oh, OUCH DUDE!! That's quite funny though, I got a good chuckle from it

Dude, you're getting Karma for that one

And in my defense, most of them were parts cars in the end, or simply sold...or for one or two wrecked...with my sis driving and the other driver's fault...I only blew/broke three or four

Laters
Ryan

[626mazdaracer]

I have the 1gen mazda not the 2gen and im wondering... wouldnt the tire size (205/45zr15) severly change the acuracy of the speedometer? And wouldnt the engine rev a lot higher at hiway speeds? I was going to buy 16's or 17's but keep the stock tire height (decrease sidewall height but increase width a little) or should i stick with 15's?

I bought coilovers for my car (2gen coilovers)....i heard that they fit on the 1gens.... do you know what the correct setting, or close to 'improved handeling' settings would be?
-sorry lots of questions any answers would help....thanks

[Ryan]

AFAIK, you'll have a helluva hard time finding a 205/45/15, since Tire Rack returned absolutely no results...Now if you were thinking a 205/50/15, you've got quite a few more sizes to choose from:
http://www.tirerack.com/tires/Compar...11&RunFlat=All

And yes, it will affect your gearing quite a bit, going from stock 205/60 to a 50 series is a good difference...To give you and idea I went from finishing the 1/4 on stock tires in 4th gear, to finishing in 5th.

Were I you 16's would be a good option, it's a good fit on the 1G's, and looks good with a drop.

As for the coilovers, don't just drop them all the way...if you're going for autocrossing start with a good 1.5" drop around and go from there. Other than that it's hard to tell you what to do without driving the car and knowing the particulars of it's setup.

Laters
Ryan

[626mazdaracer]

hey thanks for your help, i just got the coilovers in the mail yesterday. I guess i didn't realize how small they are...... should i install new tie rods and and ball joints and strut mounts too?

[Ryan]

Well, if half of the suspention is a part anyway....But if you need more help not directly relating to the thread toss me a PM, I'm glad to help

Laters
Ryan