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Drag Racing Discussion Post your questions and info about how to best get these beasts down the 1320!


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  #21  
Old 10-06-2011, 02:06 AM
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garner garner is offline
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Nice times! And love that color. Not liking how you make my truck look slow though lol
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Last edited by garner; 10-06-2011 at 02:10 AM.
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  #22  
Old 10-06-2011, 09:18 AM
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Quote:
Originally Posted by SeattlePete View Post
Which DR you select will effect your gearing- finding a short DR may be just the ticket you need. I'll see if I can dig up some old data about tire diameter vs effective gear ratio when I get home.
Calculation is pretty simple for effective ratio reductions

Old tire size/ New tire size x Gear ratio = effective gear ratio

33/27.5 = 1.2 x 3.92 = 4.70:1
33/27.5 = 1.2 x 3.55 = 4.26:1


...from a previous post:

Quote:
Originally Posted by BlackRamHemi View Post
My stock Chrome 20"x9's with 305/50R20 Terra Grapplers are about 90 pounds. Stock G/Y 275/60R20's are about 8 pounds lighter)

My Mickey Thompson ET Street DR's are 295/45R17's on Black Aluminum 17" x 9" Moto Metal 951's and weigh in just a bit over 60 pounds per corner (x4)
They actually measure out at about 27.5" tall x 11.5" wide.

Now there are several factors that come into play:

1) less weight, obviously
2) less rolling resistance, virtually no tread on DR's
3) less rotational mass (easier to turn a smaller diameter wheel)
4) Sticky compound will grab for a better full throttle launch and no spin.
5) lower ride height for better aerodynamics
(specially on 4 tires it makes my 2/3 drop look like a 5/6)
6) effective gear ratio reduction from 3.55 to about 4.30:1 (from stock G/Y's)

As a result, I'm about 5 tenths quicker,
track tested over 100 times each over the past year

305/50R20 Grappler's ... are good for mid 14's at best (at 2500' + DA)







295/45R17 Drag Radial's = high 13's, low 14's














Just Plasti-Dip'd the Chome 20's Black last night....looks way meaner now, but still not faster




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Last edited by BlackRamHemi; 10-06-2011 at 09:42 AM.
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  #23  
Old 10-06-2011, 09:39 AM
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Haha I dont mean to drag this off topic haha, but those are the orignial chrome rims? And you just plasti-dipped them? How long did that take from start to finish? Seems like an easy fix to non-chrome.
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Old 10-06-2011, 09:46 AM
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Originally Posted by JimmyTheKid View Post
Haha I dont mean to drag this off topic haha, but those are the orignial chrome rims? And you just plasti-dipped them? How long did that take from start to finish? Seems like an easy fix to non-chrome.
It took a couple hours start to finish, 4 cans, 2 coats (with a rain delay half way through)

more pic's of the Dip process in my photo thread here:
http://www.ramforumz.com/showthread.php?t=65939&page=14
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