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chefred112 08-21-2013 08:16 AM

opinions on 17" drag tire setup for 3.92's
I posted this on DT and wanted to hear from you guys as well...

I want your opinions on drag tire setups. I've swapped my gearing back to 3.92's for now (had 4.56's) and so I think I can probably go to a slightly smaller tire than what I'm using now (28" Hoosier slicks or M&H 325/45-17 's) ...anyone with shorter setups please tell me your experience with them. My 'racing' season starts next month and am thinking of replacing the worn M & H's. So let me know what you think... I'll be running on motor on 9/8 (mopar muscle magic at Sac) and putting the bottle back on for the truck drags in oct (10/20).. I'm terrible at math and trying to figure what rpm's I'll be at when i hit the traps..

BlackRamHemi 08-21-2013 11:29 AM

That sounds close Grant's (catsltd) setup...

He's on same rubber as me 295/45R17 Mickey Thompson ET's ....about 27.5" tall

his sig line:
2010-1500 SLt rclb 4x2-3:92 LSD.
Mods so far.
American Racing SS Ceramic Coated headers
Billy Boat SS Performance Muffler.
.Jet 180 stat./BT catch can.
Superchips transmission tune.
Diablo track tune.
Airaid dry flow intake.
Moes 87MM throtllebody.
Flexalight #295 dual fan.
258MM-2800 stall Triple Disc Circle-D converter.
13.539@ 98.11 MPH.

chefred112 08-21-2013 11:41 AM

good to hear thanks...I think I'll look for a 27" dr then..the mt's are a good option...

BlackRamHemi 08-21-2013 12:02 PM

Hit Grant up by PM to see where he's at for RPM's
I cant recall what he was at last time we lined up.

compressor man has run with 26" ET's on his 3G with 3.92's, I think they were a little too short


Originally Posted by compressor man (Post 1126578)
I have the 03? I think, off road 17's and they are light. I just weighed one with a 26x11.5x17 ET Street and it was 45.5lbs. I ran Friday night and only picked up 15/100 switching from a 275/55/20 on factory wheels to the dr's, would have been less but I hit the rev limiter on the first pass trying to see how long I could hold 2nd gear compared to the 275/60/20. They do seem to make more difference if I totally prep the truck, but at full weight I'm in 3rd way too long. I want to try a 28" tire, I think It will be better, maybe even an ultra light 30" to keep me in the power gears longer, 3rd is such a killer, even shifting out of 2nd at 6500. Best I could get was a 14.4 at 1500'DA at full weight minus spare and gate.

roo 08-21-2013 10:47 PM

27" tall tire with a 10% loss due to converter slip should give you about 120 mph @ 6500 rpm in 3rd (1:1) with 3.92 gears. A 15% loss would be about 114 @ 6500.

snrusnak 08-22-2013 09:22 PM

What's your max rpm Fred? You're back to the stock TC right?

USAF Long 08-23-2013 08:33 AM

with his 113.xx mph trap speed he is close to the 114 mph on a 27" tire at 15% loss. I'd stick with a 28" and re-gear accordingly. Wouldn't automatic converter slip range from 15%-25%?

roo 08-23-2013 10:06 AM

I think 25% would be kinda high.

BlackRamHemi 08-23-2013 01:02 PM

sounds too high to me too, even for aftermarket

Fred, what happened to your 4.56's ? Did you lose it to carnage?
and who's torque converter are you running now?

chefred112 08-23-2013 02:32 PM

I maxxed my rpm limiter to 7k rpms (last I remembered). I'm back to a stock verter because i need it looser for spraying. I lost a little when running on motor but I've gotten better times consistently on a stockverter. I fried my 4.56's because I'm terrible at setting gears up, lol...with 3.92's and lower you don't have to be perfect but when you get up to 56's you have to set these up more carefully...

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