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  3.55's or 4.30's????

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Author Topic:   3.55's or 4.30's????
rm302 boss
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Posts: 578
From: Austin Texas
Registered: Dec 2002

posted 04-05-2003 12:40 AM     Click Here to See the Profile for rm302 boss   Click Here to Email rm302 boss     Edit/Delete Message   Reply w/Quote
What do all of you think???
Rene

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1970 Boss 302
1990 Taurus SHO
1985 Mustang GT 351W
1995 Land rover Disco
1980 Triumph Spitfire (auto-X car)
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GTRocks
Gearhead

Posts: 2289
From: Lusby, MD, USA
Registered: Jun 99

posted 04-05-2003 08:43 AM     Click Here to See the Profile for GTRocks   Click Here to Email GTRocks     Edit/Delete Message   Reply w/Quote
I plan on going 3.73. As always this question's answer is determined by what kind of driving you do. If you do a lot of highway driving the 4.30's will kill you. If you are on the track all the time, 4.30's might not be so bad. What's your plan?

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rm302 boss
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Posts: 578
From: Austin Texas
Registered: Dec 2002

posted 04-05-2003 12:19 PM     Click Here to See the Profile for rm302 boss   Click Here to Email rm302 boss     Edit/Delete Message   Reply w/Quote
Trailer queen...... In a nut shell; pull up, drive off, kick ass, pull back up, go home ( trophy in hand).... he.. he.. he... Like i said trailer queen ... now that i have one,trailer that is.. But will i run out of motor before i get to the traps??? thats the big question...
Rene

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Kyle
Gearhead

Posts: 235
From: Sumner, WA
Registered: Dec 2001

posted 04-05-2003 12:52 PM     Click Here to See the Profile for Kyle   Click Here to Email Kyle     Edit/Delete Message   Reply w/Quote
If you know the RPM you want to be at at the end of the strip, then:

MPH= (RPM x Tire Diameter)/(Gear ratio x 336)

RPM= (MPH x Gear Ratio x 336)/Tire Diameter

Gear Ratio= (RPM x Tire Diameter) / (MPH x 336)

Just input your slick diameter, guess at your peak RPM, and you can see what speed your combo will top out at. Hope this helps.

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Moneymaker
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Posts: 19611
From: Lyons, IL, USA
Registered: May 99

posted 04-05-2003 01:17 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
4.30's

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Alex Denysenko
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rm302 boss
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Posts: 578
From: Austin Texas
Registered: Dec 2002

posted 04-05-2003 06:50 PM     Click Here to See the Profile for rm302 boss   Click Here to Email rm302 boss     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by Moneymaker:
4.30's



I should of known... Are you sure maybe some 5.14 would be better??? yeah, i like the 4.30's as well...I think the 3.55 just will not do what i want. And i want some rapid acceleration.. Its the only way a big car has a chance against rice...
Rene

[This message has been edited by rm302 boss (edited 04-06-2003).]

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Stewart
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Posts: 9155
From: Monterey, CA Mustangsandmore Member #437
Registered: Apr 2000

posted 04-10-2003 12:19 PM     Click Here to See the Profile for Stewart   Click Here to Email Stewart     Edit/Delete Message   Reply w/Quote
Alex would be The One to answer this, and he has spoken (typed? ) but I have to ask, isn't the rear gear determined by how your engine is setup, and how the engine will respond to whatever gear is in the rear? I mean, if you want a certain RPM at the finish line, and you have your engine already setup and know how it will respond with whatever gear you decide to run with, wouldn't THAT dictate what numerical gear you'd use? Taking into account tire size too, of course.

Stewart

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SS306
Journeyman

Posts: 15
From: Ontario, Canada
Registered: Feb 2003

posted 04-10-2003 03:00 PM     Click Here to See the Profile for SS306   Click Here to Email SS306     Edit/Delete Message   Reply w/Quote
I have 4.30's and highway driving is fine...it won't "kill you"

go big or go home!!! ha ha ha

Steve

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visit my website at:
http://www.samueldesigns.ca

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Daniel Jones
Gearhead

Posts: 488
From: St. Louis, MO
Registered: Aug 99

posted 04-10-2003 06:32 PM     Click Here to See the Profile for Daniel Jones   Click Here to Email Daniel Jones     Edit/Delete Message   Reply w/Quote
> What do all of you think about Gears i found a set of 3.55 and a set of
> 4.30 for 50-100 bucks? which ones??

Your C4 is 1:1 top gear. With a stock diameter tire, you'd be turning
around 6000 RPM at 105 MPH with a 4.30:1 final gear ratio. Given the
C4's first gear ratio, the 4.30:1 ratio would probably be best for the
drag strip and the autocross.

Dan Jones

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