Heading to the track in a week.. What do you think I'll run??
02-27-2011, 08:54 AM
#1
Heading to the track in a week.. What do you think I'll run??
the last time i went to the track, i ran a 13.186 @ 107.27 with a 2.063 60' time launching at about 2500rpms having to shift to 4th at the end of the quarter. that was with all of the same mods i have now, but with the stock 18x8 wheels and 235/50/18 pirelli pzero nero all seasons in the rear at about 25psi.
now i have 18x10 american muscle stock style wheels (a little heavier than the stock wheels) and 295/40/18 falken azenis rt615 rear tires and ill be updating the tune to 6800rpm redline (it was already set there, but i lowered it to 6500). 6800 should allow me to run the whole thing in 3rd gear.
so what do you think i will run? I'm going to still have full interior and everything in the car like last time. and use the same tune as last time (might try the race tune a couple runs, but we'll see).
im hoping for 12s, but idk if these tires will get me 1.9x 60' times i would need. they are primarily a road racing/auto-x tire with stiff sidewalls, which is the opposite of what you want for drag racing. but they do have a good amount of sidewall, so idk. then theres the additional ~5lbs per rear wheel which will play a small factor too.
what do you guys think?
now i have 18x10 american muscle stock style wheels (a little heavier than the stock wheels) and 295/40/18 falken azenis rt615 rear tires and ill be updating the tune to 6800rpm redline (it was already set there, but i lowered it to 6500). 6800 should allow me to run the whole thing in 3rd gear.
so what do you think i will run? I'm going to still have full interior and everything in the car like last time. and use the same tune as last time (might try the race tune a couple runs, but we'll see).
im hoping for 12s, but idk if these tires will get me 1.9x 60' times i would need. they are primarily a road racing/auto-x tire with stiff sidewalls, which is the opposite of what you want for drag racing. but they do have a good amount of sidewall, so idk. then theres the additional ~5lbs per rear wheel which will play a small factor too.
what do you guys think?
02-27-2011, 10:10 AM
#4
6th Gear Member
Join Date: Feb 2007
Location: North Carolina
Posts: 11,302
I think the same, or slower. Two reasons for slower, 1. heavier wheels, 2. you're going to have to learn what those wheels/tires do and don't like, which will take trial and error.
If you figure it out in the first couple passes, you could run the same ET as before. 5lbs per tire def makes a difference when its unsprung weight, but its not going to be all that dramatic. I think the beams will pick it up though, lol.
If you figure it out in the first couple passes, you could run the same ET as before. 5lbs per tire def makes a difference when its unsprung weight, but its not going to be all that dramatic. I think the beams will pick it up though, lol.
02-27-2011, 10:40 AM
#5
4th Gear Member
Join Date: May 2008
Location: NJ
Posts: 1,236
If you're running basically the same setup before, I don't see much of a change. If you were going to a drag radial I'd say you should have a shot at the 12sec slip you want, but switching to another street tire, even if it's a little better than the one before, I don't think is going to be that much better to get you the 60' you need. As far as the rev limiter, I don't have enough experience with the 3v's to tell you for sure, but I can tell you when I had the stock gears in my 2v, I was better off hitting 4th, even if it was for the last 100ft or so, than I was trying to ride it out in 3rd. I just wasn't making the power anymore. I don't know enough about the 3v engine's power to tell you for sure, but if you're dropping off up that high, you're better off hitting 4th and getting into the torque of the engine.
02-27-2011, 11:37 AM
#6
I think the same, or slower. Two reasons for slower, 1. heavier wheels, 2. you're going to have to learn what those wheels/tires do and don't like, which will take trial and error.
If you figure it out in the first couple passes, you could run the same ET as before. 5lbs per tire def makes a difference when its unsprung weight, but its not going to be all that dramatic. I think the beams will pick it up though, lol.
If you figure it out in the first couple passes, you could run the same ET as before. 5lbs per tire def makes a difference when its unsprung weight, but its not going to be all that dramatic. I think the beams will pick it up though, lol.
If you're running basically the same setup before, I don't see much of a change. If you were going to a drag radial I'd say you should have a shot at the 12sec slip you want, but switching to another street tire, even if it's a little better than the one before, I don't think is going to be that much better to get you the 60' you need. As far as the rev limiter, I don't have enough experience with the 3v's to tell you for sure, but I can tell you when I had the stock gears in my 2v, I was better off hitting 4th, even if it was for the last 100ft or so, than I was trying to ride it out in 3rd. I just wasn't making the power anymore. I don't know enough about the 3v engine's power to tell you for sure, but if you're dropping off up that high, you're better off hitting 4th and getting into the torque of the engine.
and when i had the car dyno'd, it wasnt making more power as i went higher in the rpm range, but it wasnt falling off. i think staying in 3rd for the last 1-200 feet would be good. i know when i had my focus, it helped a lot staying in 3rd as opposed to shifting to 4th.
02-27-2011, 10:52 PM
#10
6th Gear Member
Join Date: Feb 2007
Location: North Carolina
Posts: 11,302
The track prep and weather can change as well, making it very tough to get an accurate gain/loss per mod. Hell, I ran a half second slower today than last week... and I've added a couple bolt ons since then, lol. All due to the track not hooking as good and it being 80 degrees instead of 60.