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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 03-20-2012, 09:35 PM
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Originally Posted by ramrt1993 View Post
That's not the point..what I'm saying is, R/Ts don't necessarily have a disadvantage to other Ram because of a heavier wheel.
Oh no i got you im just surprised was really suprised when i took one off and was like WTF MY BACK lol
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  #22  
Old 03-20-2012, 09:46 PM
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Originally Posted by dodgert View Post
Oh no i got you im just surprised was really suprised when i took one off and was like WTF MY BACK lol
yeah I know what you mean..getting the wheel back on after removing it is quite a task!
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  #23  
Old 03-27-2012, 08:31 AM
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Originally Posted by WarBaby View Post
I was not aware of the governor/tuner issue. Thanks for the heads-up on that and all other informative replies. A temporary solution for me (until tuner availability) might be to run our local 1/8 mile track instead of our 1/4 mile track...heh heh!
I've solved the "smaller-tires-but-no-tuner-available-so-the-govenor-kicks-in-at-1000ft-problem". Hypertech makes a speedo calibrator that IS compatible with the 2011 up computers - I am running one in mine right now. Works just like the handheld tuners but only has options to check and clear DTCs and correct for tire size. I haven't had the opportunity to run at the track with the new set up, but my speedo is accurate with 30 inch tires. (had to tell the computer 29 inches!?)
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  #24  
Old 03-28-2012, 12:22 AM
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Originally Posted by 2011lilred View Post
I've solved the "smaller-tires-but-no-tuner-available-so-the-govenor-kicks-in-at-1000ft-problem". Hypertech makes a speedo calibrator that IS compatible with the 2011 up computers - I am running one in mine right now. Works just like the handheld tuners but only has options to check and clear DTCs and correct for tire size. I haven't had the opportunity to run at the track with the new set up, but my speedo is accurate with 30 inch tires. (had to tell the computer 29 inches!?)
Hmmm....I don't understand the 29" part--why?
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  #25  
Old 03-28-2012, 08:40 AM
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Originally Posted by WarBaby View Post
Hmmm....I don't understand the 29" part--why?
Likely because of tolerances. For example, remember the old days when police packages had "certified" speedometers? That is because standard speedometers are allowed an accuracy tolerance - I've have heard up to +/- 3%. Also, 30 inches is what my P275/70R17 tire is "speced" at, per tirerack, but just like when setting up stagger at a dirt track, you really need to measure the circumferance to get a truly accurate number as two different tires could easily measure 2 inches in circumferance different despite the same sidewall specs. When I put the 285/70R17s on my 2500 CTD, which are "speced" at 32.8 inches and I set my programmer to 32.75 inches since it uses .25 inch increments, you would think that would be the most accurate setting...nope. When I passed a radar sign, my speed was still off. I had to use either 33 or 32.5 (I don't remember which, just that it is .25 off). Now when I pass a radar sign, my speedo is dead on.

When I put the P275/60R17s on my 2011, I set the programmer to 30 inches. I passed a radar sign and my speedo still read higher than the sign indicated. I haven't passed a radar sign with the new setting, therefore my previous statement was not 100% correct, but the point is they need some tweaking to be precise. I'm willing to have my speedo err on the slow side to give me a little extra cushion so I don't hit the govenor at the track, so I set it to 29 inches for now. I was running 14.3 @ 98mph. Since then, I now have the shorter tires for more gear, removed the clutch fan, put in a 180 t-stat and removed the spare tire. I'm shooting for 13.9s. Will all that get me up to 105 mph?? If the air is good it might (my Camaro used to run 13.8 at 105 mph stock with drag radials) and if the speedo is off the wrong direction by even 1%, it could hit the govenor. If I really wanted to make sure, I could set it to 24 inches at the track and it would probably read about 70mph when I'm at 105!
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  #26  
Old 03-28-2012, 01:27 PM
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Makes perfect sense. Thanks for your time and explanation--I'll remember that!
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Old 03-28-2012, 09:31 PM
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Quote:
Originally Posted by 2011lilred View Post
Likely because of tolerances. For example, remember the old days when police packages had "certified" speedometers? That is because standard speedometers are allowed an accuracy tolerance - I've have heard up to +/- 3%. Also, 30 inches is what my P275/70R17 tire is "speced" at, per tirerack, but just like when setting up stagger at a dirt track, you really need to measure the circumferance to get a truly accurate number as two different tires could easily measure 2 inches in circumferance different despite the same sidewall specs. When I put the 285/70R17s on my 2500 CTD, which are "speced" at 32.8 inches and I set my programmer to 32.75 inches since it uses .25 inch increments, you would think that would be the most accurate setting...nope. When I passed a radar sign, my speed was still off. I had to use either 33 or 32.5 (I don't remember which, just that it is .25 off). Now when I pass a radar sign, my speedo is dead on.

When I put the P275/60R17s on my 2011, I set the programmer to 30 inches. I passed a radar sign and my speedo still read higher than the sign indicated. I haven't passed a radar sign with the new setting, therefore my previous statement was not 100% correct, but the point is they need some tweaking to be precise. I'm willing to have my speedo err on the slow side to give me a little extra cushion so I don't hit the govenor at the track, so I set it to 29 inches for now. I was running 14.3 @ 98mph. Since then, I now have the shorter tires for more gear, removed the clutch fan, put in a 180 t-stat and removed the spare tire. I'm shooting for 13.9s. Will all that get me up to 105 mph?? If the air is good it might (my Camaro used to run 13.8 at 105 mph stock with drag radials) and if the speedo is off the wrong direction by even 1%, it could hit the govenor. If I really wanted to make sure, I could set it to 24 inches at the track and it would probably read about 70mph when I'm at 105!
When you run shorter tires you will trap at a lower speed. When I was stock I would run my street tires and trap at 97ish and on my slicks I would trap at 95ish
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  #28  
Old 03-29-2012, 08:16 AM
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Quote:
Originally Posted by KarateManAZ View Post
When you run shorter tires you will trap at a lower speed. When I was stock I would run my street tires and trap at 97ish and on my slicks I would trap at 95ish
It depends on your setup. Since a shorter tire gives you a deeper effective gear ratio, you will accelerate faster - this is a given. If you still have rpms left at the end of the track with the tall tires, then you will be able to take advantange of those available rpms with the shorter tire and potentially trap higher. Specifically, if it takes you 1320 feet to accelerate to 97mph with the tall tires and you are now accelerating faster with the shorter tires, you should hit the same 97mph around 1200 feet and then surpass it by the 1320 mark - this is all providing you haven't run out of rpm. The only way you should trap slower is if you ran out of motor because you now have too deep of a gear.
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  #29  
Old 03-29-2012, 11:10 AM
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Here's the difference on my slips, both days were higher DA than normal,
my best ever trap was a 13.8 at 98.5mph on my DR's

MPH doesn't really change with lower gears or smaller tires, ET's just get quicker (in my experience)

32" Tall 305/50R20 Grappler's on stock 20's (3.55's)
(lost traction, one wheel peel at launch on the first pass)


27.5" Tall 295/45R17 DR's on 17"x 9" Moto Metal wheels (4.30:1 effective)




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  #30  
Old 03-30-2012, 01:39 AM
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It's interesting that the 22" r/t are almost the same weight as the 20" express wheels. Thanks for the link!
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