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Dragstrip and Launch Techniques Discussion 1/4 mile, 1/8 mile, launch discussions.

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Old 06-09-2013, 06:35 PM   #1
casper sc/1ss/rs
 
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richmond 411's broke again

I ripped my rear out again Friday, I was running richmond 411's I loved the gears but its about the track times from here on, so I need some info from other that are FI that have track time under there belt, im planning on running 138ish mph in a 1/4 mile with my new mods, 134mph in 4th gear was about all the car would do, my goal is to run around 138 give or take in 4th gear, im trying to decide what gear to go back with this time but I don't want to go to high, 411's I believe was hurting my mph alittle at the track because the car was crossing the line right before hitting the rev limiter. Im wanting to cross the line close to the rev limiter but not right before it hits, how much of a difference in mph would 410's be? Remember im just needing a few mph's not much at all, im afraid 391's will mess with my launching but I don't know, if someone is running around that mph in 4th gear what gear are you running? My tire o.d. is 28.8 on the rear. 410's or 391's?? Thanks!!
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Old 06-09-2013, 06:48 PM   #2
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Don't know the difference, but Richmond states that their gears aren't designed for putting up with the abuse they'd take on a drag strip.
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Old 06-09-2013, 07:04 PM   #3
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Who makes a good set?
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Old 06-09-2013, 07:13 PM   #4
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If you went down to 3.91s you could get the OEM 1LE gears, don't know if you'd need more gear with your setup though.
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Old 06-09-2013, 07:22 PM   #5
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Im trying to find out what mph the 391's and 410's will do in 4th gear then I will decide what I think will be better for my set up, we will just say with stock tire size and go from there
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Old 06-09-2013, 07:26 PM   #6
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What wheels do you have? Lighter wheels would help with your goal too btw
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Old 06-09-2013, 07:29 PM   #7
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18' race star
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Old 06-09-2013, 07:31 PM   #8
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I don't want to run out of gear the wheels will probably help with the 391's but would still like some numbers first
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Old 06-09-2013, 07:34 PM   #9
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No I understand no worries. Wish I could give you some numbers though.
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Old 06-09-2013, 08:06 PM   #10
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A manual tranny car.If you run the same mph with either gear.
The 3.91 will lower the rpm's about 300rpm less compare to the 4.11.
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Old 06-09-2013, 10:50 PM   #11
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There's a link in the sticky under trans/driveline about gear ratios by danner

Edit: here you go


http://f-body.org/gears/

and you'll need this:

The Gear Ratios for a TR6060 (manual) are:
1st: 3.01
2nd: 2.07
3rd: 1.43
4th: 1.00
5th: 0.84
6th: 0.57
R: 3.28

Last edited by Irnwkrkev; 06-09-2013 at 11:05 PM.
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Old 06-09-2013, 11:06 PM   #12
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3.91 gears, trapping at 138 in 4th gear with a 28.8 inch tire you would be at around 6295 RPM

4.11 gears, trapping at 138 in 4th gear with a 28.8 inch tire you would be at around 6617 RPM

This is the math behind the whole thing, good luck.

Rear end gear ratio = (tire diameter)(rpm) / ((transmission gear ratio)(336)(mph))
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Old 06-09-2013, 11:23 PM   #13
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3.91 gears, trapping at 138 in 4th gear with a 28.8 inch tire you would be at around 6295 RPM

4.11 gears, trapping at 138 in 4th gear with a 28.8 inch tire you would be at around 6617 RPM

This is the math behind the whole thing, good luck.

Rear end gear ratio = (tire diameter)(rpm) / ((transmission gear ratio)(336)(mph))
Awesome. Thank you.

From this I'd do the 3.91s as you risk hitting the rev limiter with 4.10s
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Old 06-10-2013, 08:22 AM   #14
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Turn your limiter up.
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Old 06-10-2013, 05:53 PM   #15
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Thanks guys!!
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Old 06-10-2013, 08:36 PM   #16
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I just got home and looked at my last 1/4mile scan with my hp tuners at 133mph im taching 6599rpms with my 411s, my cam is suppose to produce up to 7200rpms honestly I didn't really want to go to 7200rpms on the stock bottom end but will 600 more rpms get me to 138mph? The car pulls hard up top but I've never ran it to 7200rpms I still believe it might start fadeing off up that high. Any thoughts, would 410's at least give me another 100rpms to play with, because its very possible I will be over 138mph, 133 was all motor, I've uped the boost, added meth, and im putting a 75 shot of spray on it, im sure thats at least 5mph right
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Old 06-10-2013, 08:40 PM   #17
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Every 100rpm is roughly 2mph.
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Old 06-10-2013, 08:48 PM   #18
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Are their a better set of gears other than richmonds that might hold up alittle better im also putting a posi in it also to see if that will take alittle strain off of the right axle
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Old 06-10-2013, 09:21 PM   #19
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blower + nitrous + meth + 4.11's?

That's a lot to hook my friend.
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Old 06-10-2013, 09:28 PM   #20
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blower + nitrous + meth + 4.11's?

That's a lot to hook my friend.
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Old 06-10-2013, 09:42 PM   #21
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Originally Posted by casper sc/1ss/rs View Post
Are their a better set of gears other than richmonds that might hold up alittle better im also putting a posi in it also to see if that will take alittle strain off of the right axle
If you want to keep it alive, do an auto swap. The manual is going to break parts.
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Old 06-14-2013, 03:54 PM   #22
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Quote:
Originally Posted by casper sc/1ss/rs View Post
I just got home and looked at my last 1/4mile scan with my hp tuners at 133mph im taching 6599rpms with my 411s, my cam is suppose to produce up to 7200rpms honestly I didn't really want to go to 7200rpms on the stock bottom end but will 600 more rpms get me to 138mph? The car pulls hard up top but I've never ran it to 7200rpms I still believe it might start fadeing off up that high. Any thoughts, would 410's at least give me another 100rpms to play with, because its very possible I will be over 138mph, 133 was all motor, I've uped the boost, added meth, and im putting a 75 shot of spray on it, im sure thats at least 5mph right

As long as your fuel pump is keeping up above 6800 rpms you'd be ok. Most guys run into trouble when they get above 6600 rpms and their fuel pump and or injector volume can't keep up so they end up lean.
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Old 06-14-2013, 06:18 PM   #23
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I never got around to sending a set of 4.11's to Liberty, but they have a process that they can put the gears through that should help; micro polishing, cryo treat, and more. It's around $250 I think.
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Old 06-22-2013, 11:32 PM   #24
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Quote:
Originally Posted by casper sc/1ss/rs View Post
I ripped my rear out again Friday, I was running richmond 411's I loved the gears but its about the track times from here on, so I need some info from other that are FI that have track time under there belt, im planning on running 138ish mph in a 1/4 mile with my new mods, 134mph in 4th gear was about all the car would do, my goal is to run around 138 give or take in 4th gear, im trying to decide what gear to go back with this time but I don't want to go to high, 411's I believe was hurting my mph alittle at the track because the car was crossing the line right before hitting the rev limiter. Im wanting to cross the line close to the rev limiter but not right before it hits, how much of a difference in mph would 410's be? Remember im just needing a few mph's not much at all, im afraid 391's will mess with my launching but I don't know, if someone is running around that mph in 4th gear what gear are you running? My tire o.d. is 28.8 on the rear. 410's or 391's?? Thanks!!
Maybe this site can help .... https://theblock.com/parts
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