Will 3.73's increase my trap speed?
Melting Slicks
Joined: Oct 1999
Posts: 2,793
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From: carmel Indiana usa
Re: Will 3.73's increase my trap speed? (RED99HT)
Bigger gears will definitely improve your times.
I'm not very good at explaining but here goes.... the term 2.73 3.15 3.73 4.09 etc..etc.. is the relationship betweeen the motor and rear wheel revolution. The higher the gears, the more times the engine is turning the rear wheels which generally equates to faster quarter mile times.....i think :confused:
Hope this helps
David In Indy :seeya
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2000 NBM M6-Coupe
All Options minus F45
Euros/Lloyd Mats/Chrome Shifter/Ripper/Halltech tric/T-bypass/Taylor
Wires/TTS Headers/High Flow Cats/X-pipe/Indy Corsas/Baers/Z06
Calipers/Russell ss brake lines/Hawk Pads/Yokohama Avs Sports/Porsche DOT4 Hi-Performance Brake fluid/Redline oils/Zaino/Engine Dress by Auto Buffs and Design Specialties
[Modified by ledfoot, 1:44 PM 5/20/2002]
I'm not very good at explaining but here goes.... the term 2.73 3.15 3.73 4.09 etc..etc.. is the relationship betweeen the motor and rear wheel revolution. The higher the gears, the more times the engine is turning the rear wheels which generally equates to faster quarter mile times.....i think :confused:
Hope this helps
David In Indy :seeya
----------------
2000 NBM M6-Coupe
All Options minus F45
Euros/Lloyd Mats/Chrome Shifter/Ripper/Halltech tric/T-bypass/Taylor
Wires/TTS Headers/High Flow Cats/X-pipe/Indy Corsas/Baers/Z06
Calipers/Russell ss brake lines/Hawk Pads/Yokohama Avs Sports/Porsche DOT4 Hi-Performance Brake fluid/Redline oils/Zaino/Engine Dress by Auto Buffs and Design Specialties
[Modified by ledfoot, 1:44 PM 5/20/2002]
Running Guns & Moonshine
Joined: Aug 2001
Posts: 12,672
Likes: 7,304
From: CT
Re: Will 3.73's increase my trap speed? (ledfoot)
Ok, I might be rusty here too, but this is my understanding. Numerically higher, but termed lower gears will lower your trap speed but also lower your mph. The trick to it as I understand it is that your engine is spinning that many more times in order to turn the wheel once. Hence a 2.73 only takes 2.73 revolution to turn the rear wheels once while 3.73 takes a full extra revolution of the engine. This is why your engine revs faster with lower (numerically higher) gears.
It stands to reason that the the lower gear should not lower your trap speed much, but also note that the lower gear has somewhat larger surface area making contact between the ring and pinion and this adds friction which takes more power to turn.
Of course, I may not be 100% with this info. But I think I've got it pretty close. :D
It stands to reason that the the lower gear should not lower your trap speed much, but also note that the lower gear has somewhat larger surface area making contact between the ring and pinion and this adds friction which takes more power to turn.
Of course, I may not be 100% with this info. But I think I've got it pretty close. :D
Racer
Joined: Aug 2001
Posts: 294
Likes: 0
From: Indianapolis IN
Re: Will 3.73's increase my trap speed? (RED99HT)
I'd guess stay the same or go down. I think faster speeds result from being out there a little longer period of time. Sounds backward, but logical at the same time.
Safety Car
Joined: May 2000
Posts: 4,827
Likes: 352
From: Albuquerque NM
Re: Will 3.73's increase my trap speed? (RED99HT)
Your trap speeds should go up, and your times down. How much just depends on if you can get traction and how flat your engine's torque curve is. Bigger numerical gears will get you up on the cam sooner, so the flatter your torque curve, the less they will help. For example, the TPI C-4's don't gain much with a gear change because they have really flat torque curves, but a peaky cammed car will respond much more to a gear change. :cheers:
Thread Starter
Pro
Joined: May 2000
Posts: 576
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Re: Will 3.73's increase my trap speed? (6Speeder)
Your trap speeds should go up, and your times down. How much just depends on if you can get traction and how flat your engine's torque curve is. Bigger numerical gears will get you up on the cam sooner, so the flatter your torque curve, the less they will help. For example, the TPI C-4's don't gain much with a gear change because they have really flat torque curves, but a peaky cammed car will respond much more to a gear change.
This is what I was thinking. I have a pretty flat torque curve as it is but my cam really wakes up in the upper RPM range 4k+. 6Speeder, I think your right that if my motor hits its sweet spot quiker, I could have a higher MPH. Thanks
This is what I was thinking. I have a pretty flat torque curve as it is but my cam really wakes up in the upper RPM range 4k+. 6Speeder, I think your right that if my motor hits its sweet spot quiker, I could have a higher MPH. Thanks
