Competition Difference between 285's & 315's in 1/4 mile?

[Devil Black Diesel]

I'm just wondering how much 315's slow you down in the 1/4 mile compared to 285's? Has anyone ever ran the same truck/same day with both 285's and 315's to compare 1/4 times?



I imagine the 315's will slow you down quite a bit - I remember how gutless my stock CTD became when I put my 315's on... it became a total slug even with the 4. 10's.



Thanks

 

[Timbeaux38]

Mine pigged when I put 315's on too... I run 3. 55 gears... . I've read where people say they get better fuel mileage with them b/c of the drop in RPM at speed, but I think they are FOS... .





Nice lookin truck BTW! are those 3rd gen rims?

 

[TJany]

i run the 315's and if i keep my foot out of it i'll run 19. 5 mpg on the road, as far as quarter mile times i can't say, but the 315's def did not hurt my mpg

 

[CumminsAholic]

Sorry I can't answer your question but for others that are curious, I gained in the quarter and in mpg by going with my 295's over the stockers. I have 4:10 gears though.

Corey

 

[J.Post]

i run the 315's and if i keep my foot out of it i'll run 19. 5 mpg on the road, as far as quarter mile times i can't say, but the 315's def did not hurt my mpg

Unless you have corrected your speedo you getting even better mileage than that. Since the 315s are larger than stock you are going farther than indicated. Possibly 8% better. That would put you closer to 21mpg.

 

[Devil Black Diesel]

Back to the top

Bump -



Someone's got to know the answer... I've read several posts where guys claim they take off their 315's and put on 285's when they go to the drag strip.

 

[TJany]

If i did my math correctly, the difference is about 10%... now i've never been all that good in math so i may be wrong... however, assuming my 10% number, the 19. 5 is corrected using that... on the contrary, I wish to &^## you were right with the cost of fuel anymore



Tim