Track times

[renaldo99]

Ok for my first time going to the track on stock tires and a half tank of gas i ran my tahoe 6 times and got these #s

2wd runs
1st run 1/8 [email protected] 1/4 [email protected]
2nd run 1/8 [email protected] 1/4 13.328@103

4wd runs
1st run 1/8 [email protected] 1/4 [email protected]
2nd run 1/8 [email protected] 1/4 [email protected]
3rd run 1/4 13.199@? forgot to pick up slip but was told i ran this

kinda dissapointed with my times i was really thinking i was gonna get high 12's..
just wanna know what i can do to get better times ????

 

[blueflamed03]

what was DA and outside temp?

 

[renaldo99]

what was DA and outside temp?

It was 60 degree weather, and what does DA mean lol

 

[2 E L O]

DA = density altitude.

Given your ETs, trap speeds, and consistency it doesn't look like you were having wheel spin issues.

What were your 60' times? What gear/rpm were you trapping? Steeper gears and slicks would be the first things I'd change to improve your performance.... 3.42s are rather shallow.

 

[renaldo99]

DA = density altitude.

Given your ETs, trap speeds, and consistency it doesn't look like you were having wheel spin issues.

What were your 60' times? What gear/rpm were you trapping? Steeper gears and slicks would be the first things I'd change to improve your performance.... 3.42s are rather shallow.

2wd runs
1st run 1/8 [email protected] 1/4 [email protected] =reaction +.267 60ft1.981 594ft8.133
2nd run 1/8 [email protected] 1/4 13.328@103 =reaction +.501 60ft1.914 594ft8.054

4wd runs
1st run 1/8 [email protected] 1/4 [email protected]= reaction + .177 60ft1.858 594ft7.991
2nd run 1/8 [email protected] 1/4 [email protected] =reaction +.160 60ft1.840 594ft7.966

i was spinning on 2wd when i was launching@2000-2500rpms so i launched on no rmp build up and hooked with a lil slip... on my fist 4wd i launched at 3k and on my 2nd 2500

 

[2 E L O]

2wd runs
1st run 1/8 [email protected] 1/4 [email protected] =reaction +.267 60ft1.981 594ft8.133
2nd run 1/8 [email protected] 1/4 13.328@103 =reaction +.501 60ft1.914 594ft8.054

4wd runs
1st run 1/8 [email protected] 1/4 [email protected]= reaction + .177 60ft1.858 594ft7.991
2nd run 1/8 [email protected] 1/4 [email protected] =reaction +.160 60ft1.840 594ft7.966

i was spinning on 2wd when i was launching@2000-2500rpms so i launched on no rmp build up and hooked with a lil slip... on my fist 4wd i launched at 3k and on my 2nd 2500

Pretty good for such a heavy truck!

What rpm and in what gear were you crossing the finish line? What size tires are you running? I'm guessing you were crossing the line pretty soon after hitting 3rd gear. If you're serious about racing you should swap your gears so you're crossing the line near the top of 3rd gear. This means at least 4.10s or possibly even 4.56s depending on your tire height.

 

[renaldo99]

Pretty good for such a heavy truck!

What rpm and in what gear were you crossing the finish line? What size tires are you running? I'm guessing you were crossing the line pretty soon after hitting 3rd gear. If you're serious about racing you should swap your gears so you're crossing the line near the top of 3rd gear. This means at least 4.10s or possibly even 4.56s depending on your tire height.

i believe i have 225 55 r20 goodyear ls2 tires and idk what i was crossing at i have 3:42 gears

 

[redemn93]

thats what killing you. if you can get by the traps with 4:10s you will def be 12s

 

[renaldo99]

thats what killing you. if you can get by the traps with 4:10s you will def be 12s

r those safe for freeway driving cause i drive on one everyday

 

[2 E L O]

i believe i have 225 55 r20 goodyear ls2 tires and idk what i was crossing at i have 3:42 gears

I assume you meant 255, not 225....

Anyway, 4.10s would help you drastically...but you'll need slicks to take full advantage of them... With a 4L60E transmission, 31" tires, and 4.10 gears you should cross the line at about 4,500 to 4,700rpm and you should cut at least 0.2 or 0.3 off your ETs...probably more.

Right now you're crossing the line at about 3,800 to 3,900 rpm in third.

A good approximation is that for every 0.1 second you can cut off your 60' time, you will drop 0.2 second off your ET. I think you could easily cut your 60' times down to the 1.75X range with 4.10s/slicks...

Good luck!

Also, drop any dead weight in the vehicle if possible. Another approximation is for every 100 lbs you shed, you'll cut 0.1 seconds from your ET.

You'd definitely be fine with 4.10s on the freeway. Right now you probably cruise at about 1945rpm at 75 mph with your 3.42s. With the 4.10s you'd cruise at 2330 rpm at 75 mph. No big deal at all....

 

[renaldo99]

I assume you meant 255, not 225....

Anyway, 4.10s would help you drastically...but you'll need slicks to take full advantage of them... With a 4L60E transmission, 31" tires, and 4.10 gears you'll should cross the line at about 4,500 to 4,700rpm and you should cut at least 0.2 or 0.3 off your ETs...probably more.

Right now you're crossing the line at about 3,800 to 3,900 rpm in third.

A good approximation is that for every 0.1 second you can cut off your 60' time, you will drop 0.2 second off your ET. I think you could easily cut your 60' times down to the 1.75X range with 4.10s/slicks...

Good luck!

Also, drop any dead weight in the vehicle if possible. Another approximation is for every 100 lbs you shed, you'll cut 0.1 seconds from your ET.

Ok im going to gut out my rear seats and speaker system... but what if i just get Drag Radials for now will that help alot?

 

[redemn93]

drag radials will help some. with my 3.73s i do 75 about 2100 i think to give you an idea. but 3.73s isnt worth the swap. what kind of speaker system do you have? i know some of these guys have a couple hundred pounds worth.

 

[renaldo99]

drag radials will help some. with my 3.73s i do 75 about 2100 i think to give you an idea. but 3.73s isnt worth the swap. what kind of speaker system do you have? i know some of these guys have a couple hundred pounds worth.

im at 2100 when im going 70-75 with 3:42s, yeah my box is like over 100lbs

 

[blueflamed03]

yep, gears would REALLY wake that up...heavy truck and those anemic 3.42's. I have a brand new set of 4.10's I havent installed either, because of the same issue.
3.42's are a great gear.....for a car. Not a 5700lb tank

Borrow some ET Streets or Drag radials, get soem 4.10s and then you will RWALLY feel it...12's indeed.

 

[renaldo99]

yep, gears would REALLY wake that up...heavy truck and those anemic 3.42's. I have a brand new set of 4.10's I havent installed either, because of the same issue.
3.42's are a great gear.....for a car. Not a 5700lb tank

Borrow some ET Streets or Drag radials, get soem 4.10s and then you will RWALLY feel it...12's indeed.

if i get 4.10s for the front and rear will it be safe for driving on the freeway???

 

[JKmotorsports]

Definitely need a gear swap and pull out as much weight as you can for your next run. Run a set of slicks so you can launch at higher rpm and hook. I'd go at least 4.10 if you run those same tires. I ran on my 305/35/24 (32.5" o.d.) with my old stock 3.73 and ran thru the traps at the bottom of 3rd, which isnt good. I swapped to 4.56 and it made a HUGE difference SOTP, but havent ran it since the gear swap.
A gear swap and diet (stereo system, rear seats, etc) will shave a few tenths off your time.

 

[renaldo99]

Definitely need a gear swap and pull out as much weight as you can for your next run. Run a set of slicks so you can launch at higher rpm and hook. I'd go at least 4.10 if you run those same tires. I ran on my 305/35/24 (32.5" o.d.) with my old stock 3.73 and ran thru the traps at the bottom of 3rd, which isnt good. I swapped to 4.56 and it made a HUGE difference SOTP, but havent ran it since the gear swap.
A gear swap and diet (stereo system, rear seats, etc) will shave a few tenths off your time.

thats what im going to do, get the 4.10s for the fronts and rears, gut everything out and if i dont get slicks ill launch on 4wd i guess..

what did u run on your 1/4 mile?

 

[JKmotorsports]

thats what im going to do, get the 4.10s for the fronts and rears, gut everything out and if i dont get slicks ill launch on 4wd i guess..

what did u run on your 1/4 mile?

Even w/o slicks, launching 4wd with lower gears will help a lot.
I ran [email protected] with the 24s, 3.73, full weight w/stereo and a passenger, and launching only about 3/4 throttle for about the first 50 ft or so. Next time I run, I'll have these 4.56 gears and I'm hoping to have a set of smaller wheels and slicks so I can launch and see what this truck will do. I gotta trim down the weight also. Weighed in just under 6100 lbs with everything in it. Not to mention these 24s are way too heavy to be running down the track.
But anyway, you shouldn't have a problem getting into 12s with a gear swap.

 

[blueflamed03]

amen, gears would be a huge gain, and tires, because with the lower gears, increased tire spin is inevitable.

 

[2 E L O]

amen, gears would be a huge gain, and tires, because with the lower gears, increased tire spin is inevitable.

True....but sometimes you actually may spin less with steeper gears installed. With the shallow gears it's usually a bit harder to spin, but once you break loose you will spin FOREVER unless you get way out of the throttle. With the steeper gears it's easier to spin, but you don't spin as bad and it's much easier to feather the throttle a bit rather than getting totally out of it and letting the tires slow down.

It's just a fine line you have to balance when running street tires. If you go with slicks, it's basically a moot point. Go with the steepest damn gears as possible and hold the f on!!!!