How much slower with big tires?

[Swayse00]

How much are my 315/75/16's and my 2" front lift slowing me down in the quarter? I got a 15. 41 at 90 mph. My problem, my brother-in-law's PSD with a chip and propane gets a 15. 04 at 89 mph, but he has an auto. They don't seem to think that my tires are slowing me down. I'm tempted to put my 265's back on and take the lift down just to see what time I could get. But then again, I still need to put in my South Bend clutch.

If we race from a roll, I can get pretty easily, but I want my bragging rights on paper. I could always add propane.

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2001 ETC 5 speed, 4" exhaust, DDI, HOT PE, 2" front lift, 315/75/16 BFG.
1980 CJ7 350, SM465(for sale)

 

[Deezal Man]

Forced air motors perform better in front of an automatic. End of story. Everytime you shift your manual transmission, the lost boost.

Putting DC's automatic aside, If you put the same motor in front a manual transmission and an automatic transmission. The automatic will turn quicker time slips.

As far as the larger tires, Absolutely they slowed you down. aside from the added weight. Thats like changing gear ratios or starting in 2nd or third gear.

Considering its disadvantages, your truck did really well.

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98. 5' Emerald Green 24v 2500 Auto/3. 54 4x4 SB QC 285. 75. 16's Bridgestone Dueler A/T's on 16" x 8" Alcoa's under Rancho 9000's. Everything but leather. PIAA 1200's, AMSOIL dual filter relocation system, Smittybuilt Stainless Steel Nerfs, Rhino Liner(Junk).