verbs

one gripe I hear from people regarding getting shorter gears (4.10's/4.30's) is that when they are on the street they lose all their topend should they happen to get in a freeway race.

Now, 4.56's with 28 tires are one of the best combinations out there for the track I'm sure we all agree.

But with 4.56s on the street, do you really lose topend?

My thinking is that with 275/40/17s and 4.56's you are forced to shift into 5th gear at about 110mph if you shift at 6500 rpms. Most would say the race would be over, right?

Well, the overall gear ratio in 5th with a 4.56 axle ratio is 3.374.

Now, that being said, a car with 4.56's in 5th gear will pull just about as hard as a car with 3.42's in fourth gear which has a 3.42 overall ratio.

I know 5th gear is a weaker gear, but for the few times someone might race above say 110mph, I'm sure it'd be OK to use.

Am I wrong in thinking that 4.56's represent the best compromise for ***** out track racing and top end street racing? After all, the car with 3.42's shifts into 4th at about 112mph @ 6500 rpms, while the car with 4.56s shifts to 5th at about 110mph.

So from 112mph on, the gearing should be identical to a stock geared car!

<small>[ December 01, 2002, 11:57 AM: Message edited by: verbs ]</small>

CHRISPY

This is a moot point, we all know you cant race on the street <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

4.56 gears with DR's would be AWESOME on the street for 1/8th mile (what 80% of the races are on the street anyways <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> )

cheers,
Chris

ps- on the track 4.56 and 28's are hard to beat for consistency <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

verbs

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Chris ARE 360:
<strong>This is a moot point, we all know you cant race on the street <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Um, yeah, uh.....this is one of those theoretical bench racing questions <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> <img border="0" alt="[jester]" title="" src="graemlins/gr_jest.gif" />

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Chris ARE 360:
<strong>4.56 gears with DR's would be AWESOME on the street for 1/8th mile (what 80% of the races are on the street anyways <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> )
</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">80% where you live anyway...here its the opposite..maybe 20% are from a light lol...

How the hell do you hook on the street with 4.56's? Even with 3.73's and a bog inducing aluminum flywheel I can barely keep em planted. I can't imagine I'd have any traction in 1st or 2nd!

<small>[ December 01, 2002, 10:20 PM: Message edited by: verbs ]</small>

verbs

Anyone else have experience on the street with 4.56's?

FastAl

I'm running 4.56 gears with my MMS 2x heads/cam setup. On street tires, anything more then about 1/2 throttle start and the tires just spin! Once I'm above about 20-30 I can floor it and get some spin and the tires hook good in second and above.

Of course from a bench racing view, on the street even 1/2 throttle start and then hammering will beat most cars out there <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

Louis

iTrader: (7)

It depends on how they race in your area and which you do more of. In Dallas, we race to 160 dependant on the time. If its late at night on George Bush fwy, Ive come close to hitting the 6500 limiter with 4.10s in 5th <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" />

Jeremy (Godspeed on the boards) Had an ARE 385 TT that he hit 180 in 5th with 3.73s- He is a highway racer, so the shorter gear was useless for him.

This is the reason for me putting a 9" in over a 12 bolt. I can swap pumpkins in 30 minutes <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> 3.60 for the street, and a 4.56 or 4.88s for the track <img border="0" title="" alt="[Cool]" src="gr_images/icons/cool.gif" />

verbs

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by G2 LS1:
<strong>It depends on how they race in your area and which you do more of. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Out here its racing to 150 or so from 50-70mph rolls.

Thats why I was thinking that 4.56 would be such a great compromise.....great for the track, and 5th gear pulls just as hard as a car with 3.42's would pull in 4th gear.

The 4.10's and 4.30's just don't pull hard enough in 5th gear IMO.

Louis

iTrader: (7)

I agree that 5th doesnt pull very good, but the split from 4th -5th is very wide- ~1800 RPMs. If your car has tons of midrange like mine, it will get over that flat spot, and continue pulling <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

Keep in mind too- if you go from a 60-80 punch, they are going to be 1 gear lower than you. 80 punch, Im in 4th, the opponant is in 3rd <img border="0" alt="[Burnout]" title="" src="graemlins/burnout.gif" />

JurisAg02

I can't hook worth a **** on the street with my 4.56's...I spin all the way until the top of third and sometimes even the bottom of fourth....I love street racing but just can't really do it anymore with these gears since most races are from a light roll...now at the track, these gears are unbeatable! <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

verbs

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by G2 LS1:
<strong>I agree that 5th doesnt pull very good, but the split from 4th -5th is very wide- ~1800 RPMs. If your car has tons of midrange like mine, it will get over that flat spot, and continue pulling <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

Keep in mind too- if you go from a 60-80 punch, they are going to be 1 gear lower than you. 80 punch, Im in 4th, the opponant is in 3rd <img border="0" alt="[Burnout]" title="" src="graemlins/burnout.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">That's one of my biggest problems is that I don't have any midrange. My cam doesn't do squat till 5000+rpms.

Having 3.73's allows me to hold out 4th gear till 143mph @ 7000rpms or so, but once I hit 5th gear the race is almost over for me. It feels like the car takes a performance dump even though the rpm's only drop to about 5100rpms.

that is why I figured that if I had to shift into 5th gear a lot earlier than I do now (say with 4.10+ gears), I might as well try to make 5th gear as effective as possible, hense the thought of 4.56's.

I was thinking that if a car with 3.42's shifts into 4th at 112mph at 6500rpms, I'm shifting into 5th with 4.56's at 110mph at 6500rpms, so our gearing would be equal from 112mph on out.

Is my thinking *** backwards here?

<small>[ December 02, 2002, 03:58 PM: Message edited by: verbs ]</small>

Louis

iTrader: (7)

No, Youre not off, There are 2 ways to look at it- With the taller gear, the trans is spinning at a slower RPM, so for a road race car- that is not good. You would like the gears to be spinning fast to begin with, because it takes less energy to spin them once they are already spinning fast.

Another thing to remember is your traveling at ~110- 115 mph when shifting into 5th. Getting back into your powerband with the less wind resistance is a lot easier at that speed, rather than 140 <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

I remember before I got my HCI pkg done, I was toast if I had to shift into 5th. It was an Immediate ~2 carlength loss.

Then, Take it to the strip, toss on the 28s and away you go! <img border="0" title="" alt="[Cool]" src="gr_images/icons/cool.gif" />

VINCE

iTrader: (1)

We run to 120mph around here.. Either from a stop or from a 40mph roll..