1/4 mile question

I took my 13 CM rock warrior to the track Sunday and had a blast. Ran consistent 15.1-15.2@92. I was launching in 4hi with all traction control off. I would shift into 2wd before the end of 1st gear. It did seem to clunk toward the end of 2nd not sure if that was the transfer case. I made 1 full pass in 4hi and ran a 15.0. How horrible is it to be in 4hi @92 mph?

 

@Sean266 has ran his on the ¼. Might have some insight.

 

It's normal for the transfer case to clunk when you put it back in 2we. It's just the gears disengaging. I would think it is hard on it to shift in Or out of 4we when you are in the throttle hard though. Good way to scatter your shit all over the track! As far as I know there is no limit to how fast you can go in 4wd.

 

Doesn't Sean have the S/C on his? Bet that shaves off at least two seconds. My local independent Toyota tech has a DC long bed with the SC. He took me for a ride in it, holy crap that thing is fast!

 

Yeah, our front diffs are tiny compared to the rear. Romping on it hard in 4wd at launch probably isn't wise. Like Sean said, just air down. Or better yet, get some drag radials. The fattest ones you can stuff in there!

 

I have tried a few different ways to launch and computer aided "lsd" seems to hurt more than it helps. Any suggestions for psi on my 285/75r17 bfg all terrains. That's why I tried the 4hi

 

Yeah, our lsd uses the abs to transfer power. No bueno for quick launch. I'm to pro drag guy, so not sure about the pressure. But it seems like you'd want to air down as far as you can without going so low that it makes your truck to squirly and unsafe.

 

I bet a standard cab, short bed 2wd with a super charger and drag radials would be a bad bitch!

 

Or you could just weld the spiders!

 

Ultimately the answer is to fix my track car and stop racing the tow rig. Thanks for the info guys.

 

Yeah, don't break the tow rig just in time to not be able to get your track car to the track. What you got for a track car?

 

I have always been told don't go over 55 in 4wd. Because if you can go that fast there's really no need to be in 4wd. I would fear blowing up the transfer case. Not worth it just to brag.

 

you can go over 55, you just can't engage or disengage.

Me, and several others have done hundreds on 4hi launches with superchargers. Do this in good conscious. You won't hurt anything.

wait to disengage 4hi til after below 55. And definitely disengage before turning at the end of the track to go back to pits. You don't wanna make a turn in 4hi

 

@Joeshaker dont laugh but it's a 92 civic hatchback with a 2.0 swap and a turbo. It will run in a 11.50 index class when it's done. @dirtydeeds when you say hundreds in 4hi do you mean hundreds of passes at the drag strip or hundred mph in 4hi?

 

I mean that I've done hundreds of passes.

 

Nothing wrong with a 92 civic, especially if it'll throw down an 11.5! You would probably outrun my cougar. Of course it's not set up for drags. Top loader 4sp with a worn clutch and NASCAR gears.

 

agreed^

 

Been out to LVD a couple of times, running a best of 15.22 @ 90 mph,not too bad with all my tools and junk in the bed and a almost full 38 gal. fuel tank. Left in 4Hi too keep from smoking the tires! One added plus is not having to wear a helmet in the summer time, it gets hot with the windows closed and no AC!