1/4 Mile Time List

[BlackXJ4.0]

Since this is the street section, I thought it might be a good idea to compile a list of all the 1/4 and/or 1/8 mile times that people have run in their jeeps, along with the mods that they have done. I realize that not a lot of people run their jeeps at the track, but if those that have could post in here we could possibly have a good resource for those looking to compare their jeeps to others, see if their jeep is running right, etc.

If you want to post in here, please try to post as much info as you can about your jeep and the time that you ran.

I'll start with mine:

-93 XJ 4.0 4x4 4door, aw4, 225/75-15 Goodyear Wrangler GSAs (28 psi rear, 35 psi front) full weight minus spare tire, roof rack, 1/4 tank of gas
-forgot to weigh it at the track

Mods:
-ported head (full port on intake and exhaust, combustion chambers cleaned up as well)
-99+ intake swap
-bored stock tb
-2.25 mandrel bent catback w/some kind of muffler better than stock, dent taken out of stock engine pipe
-motor was bored .040 over when it was rebuilt ~20k miles ago

Track:
-Launched at 1300-1400 rpm, no wheelspin (higher rpm launches would just make me spin)
60' 2.461
330' 6.894
1/8 10.613
1/8mph 66.58
1000' 13.61
1/4 16.584
1/4mph 80.88
D/A 1674

Corrected to 0 D/A:
1/4 mi 16.27
1/4 mph 82.461

 

[tdogg55555]

not bad man, I know a few xj's that have dipped into the low 14's and high 13's naturally aspirated...

 

[jeepinwi]

not bad man, I know a few xj's that have dipped into the low 14's and high 13's naturally aspirated...

Please share more details about these N/A XJ's that have run in the 13's.

 

[tdogg55555]

Check this site out, this seems like its legit and all. Hes got videos and times slips from the track. Its a 4 door 4wd too.....freaking amazing thats hes getting in the 13's. Obviously on juice....but still, our xj's do have incredible potential.

 

[tdogg55555]

http://www.qwkjeep.com/

 

[seanyb505]

I cant help but notice...having a nitrous system is not naturally aspirated. I wanna say someone on Jeepforum got theirs into the 12s with nitrous, then blew it up later. Anyway, mods:
APN header
99 Intake
Straight through Bullet Muffler
235/75/15 Tiger Paws (good stuff...not really)
Cone filter set-up
2wd 5spd 4dr

16.2 @ 84 or 85mph, I cant remember which.

I cant wait to get back to the track:
4.6 Stroker
Mechanical fan pulley delete
3.55 gears
Hopefully I will have 255/55/16 UHP Grabbers by then.

 

[tdogg55555]

Well I dont exactly think its cheating or anything by using nitrous, I think that guys got a nice clean quick ride. I think he did a good job with it. Usually when I refer to naturally aspirated im thinking non turbo, non supercharged, and no internal mods to the motor....but i guess if we have to get technical about the nitrous....your right. I know n20 jeep over at jeepforum got his 90 into the 13's with just a 75 shot and basic bolt on mods.....still very impressive even though he used nitrous. Nitrous is fairly cheap and when used correctly, is safe.

 

[Dr. Dyno]

My best ever was [email protected] when my 4.6 stroker still had the Crane 753905 cam with a "race" weight of 3450lb due to 170lb of weight reduction (lighter exhaust, removed all skidplates, clutch fan, roof rack bars, spare wheel, rear seats, front passenger seat, <1/4 tank of gas).

http://www.dragtruk.com/ENTRIES/A9DFB5LA1GZW.html

In full street trim (1/2 tank of gas, seats and spare wheel in place) and a "race" weight of 3620lb it did [email protected].

 

[JJacobs]

Well I dont exactly think its cheating or anything by using nitrous, I think that guys got a nice clean quick ride. I think he did a good job with it. Usually when I refer to naturally aspirated im thinking non turbo, non supercharged, and no internal mods to the motor....but i guess if we have to get technical about the nitrous....your right. I know n20 jeep over at jeepforum got his 90 into the 13's with just a 75 shot and basic bolt on mods.....still very impressive even though he used nitrous. Nitrous is fairly cheap and when used correctly, is safe.

Whoa there- naturally aspirated has nothing at all to do with whether or not the motor's been opened. Technically even nitrous is still NA because there's no positive pressure in the plenum. Most people won't claim that anymore, though.

 

[nick86]

http://en.wikipedia.org/wiki/Naturally_aspirated

 

[JohnX]

100% stock 97 4.0 auto 4x4 sport. 30 inch tires, 3.55 gears. Jeep was new to me, had about 120k on it.

Only ran the eighth....

10.6x @ 66.xx mph

 

[BlackXJ4.0]

100% stock 97 4.0 auto 4x4 sport. 30 inch tires, 3.55 gears. Jeep was new to me, had about 120k on it.

Only ran the eighth....

10.6x @ 66.xx mph

Do you know what rpm you launched at on this run, and the Density Altitude on that day?

 

[tdogg55555]

Whoa there- naturally aspirated has nothing at all to do with whether or not the motor's been opened. Technically even nitrous is still NA because there's no positive pressure in the plenum. Most people won't claim that anymore, though.

I thought I was right the first time, tell seanyb that about the nitrous. So heres a question, is it possible to run nitrous on a 4.6? is the compression typically too high on the them? I mean theres 2 definites that have ran 13.95's with the 4.0, could you imagine a 4.6 on juice? 13.5 maybe? Im sure traction would be a MAJOR issue though....

 

[j99xj]

I have no clue where my time slip is but I remember my 1/4 mile was:

18.55 seconds @ 75 mph.

I know its sluggish, but this was the Pueblo Motorsports Park, Pueblo, Colorado, on a hot summer day, 90+ at 5000 feet of elevation.

The Jeep was running 30 inch all terrain tires, launched at about 2000 rpm, and stock 3.55 gears with automatic tranny. The only mods to speak of at the time was a K&n cone filter, bored tb, spacer, and cat back exhaust.

I think I had a 1/2 tank of gas and about 100 lbs of tools/junk in the back. I think I had my a/c off with my windows down.

Also this was with the full skid plate and off road package with up country suspension.

 

[BlackXJ4.0]

For anyone wanting to calculate their D/A, or correct for D/A, this site is a big help:
http://www.greatlakesdragaway.com/correctionfactors.html

 

[JohnX]

Do you know what rpm you launched at on this run, and the Density Altitude on that day?

XJ was launched at idle. Flashed the converter and had minimal wheel hop. Trying to stall the converter only resulted in wheel spin. Been a few years since then, but I do recall it was a VERY cool night at a track with only minimal altitude. Probably close to sea level like numbers.

 

[JJacobs]

I thought I was right the first time, tell seanyb that about the nitrous. So heres a question, is it possible to run nitrous on a 4.6? is the compression typically too high on the them? I mean theres 2 definites that have ran 13.95's with the 4.0, could you imagine a 4.6 on juice? 13.5 maybe? Im sure traction would be a MAJOR issue though....

Nitrous is possible on just about anything. It's not compression sensitive like boost, either. There's guys spraying the heck out of 14:1. The tuning window before it spits out parts gets narrow- but nitrous in and of itself does not raise the amount of air causing compression sensitivity like boost does. The n20 only allows huge amounts of fuel to be efficiently burned- this is what makes the power, the n20 is only the catalyst to allow it.

If stock rods and cast or hypereutectic pistons are used the nitrous shot should be kept small. With h-beam rods and forged pistons, head studs I can see using 200 on a 4.x motor- experimentation will tell if it needs orings or not.

 

[tdogg55555]

It seems the stock 4.0 responds pretty well to n20.....bet chrysler never thought about that when using the 4.0 lol.

 

[BlueCuda]

I haven't run mine yet.

But, a friend of mine ran his 97 Country a few years ago. It had a 2 inch BB lift and 30 inch tires. Stock air filter and a flowmaster muffler. It ran 16.02 but I forgot what MPH. Him and a friend of his were talking shit about who was faster the jeep or his buddies Astro Van. The astro van ran a 16.50 IIRC lol.

I might run mine this november. Our local track has an all mopar race and it doesn't look like my Barracuda will be ready due to my wedding in late october. So if the barracuda is not ready the jeep is going . It will be slow though, 4.6 stroker stock head with crane 753901 cam, 2.5" S-pipe back with a 2 chamber flowmaster, stock airbox. Biggest problem is its heavy and I will run it in full trail trim with my spare axles and everything .

 

[Dr. Dyno]

I mean theres 2 definites that have ran 13.95's with the 4.0

I haven't heard of any 4.0 or 4.0-based stroker run lower than 14's on motor alone (naturally-aspirated with NO nitrous).