vasinvictor

iTrader: (3)

I'm wondering how a rf1a gear driven transfer case would hold up at 90mph in 4WD. This relates to 4WD launch at a drag strip.

donomite49

good question

i know it will be fine at 60 mph since i did that this winter in the snow

anybody?

HighLux

It would not last very long. Not designed for sustained speed. Probably foam the oil up at that speed as well. Now...wtf would you possibly want to launch at the strip in 4wd? Would def make it slower.

85TurboRunner

It will last as long as anything else on your truck doing 90mph. Just don't turn. You can go as fast as you want as long as you want in 4wd as long as you are not turning on a high traction surface.

Your oil will not foam up or whatever that other guy said.

HighLux

Its a splash oiling system...meant to be driven in 4wd at low speeds...with a max of 60. The oil will cavitate...reducing oiling...heating it up...making it thinner...and more likely to cavitate....rinse repeat. It will burn the t case up.

I doubt it would even do 90 in 4wd anyways... has nothing to do with turning either....its not a locker....jeez.

85TurboRunner

The turning comment was for the sake of the drivetrain not binding up. But whatever if you think speed matters more power to you.

But getting to 90 would be the biggest issue.

scuba

Traction.

HighLux

Would have to have a lot of power to worry about traction in a toyota 4wd...lol. I would think a simple set of drag radials and a decent burnout would handle anything a toyota is gonna do.

Launching in 4wd in a toyota pickup or runner is ridiculous. For that matter...even running one at a track is. What ya gonna run? an 18?

But id I were to do it...I sure as hell wouldn't run it in 4wd....lol.

MudHippy

Well...RF1As do have an oil pump screw(see here). So they aren't entirely splash oiled. But that wouldn't necessarily make 90 mph operation that much better of an idea.

Reality check: There's pretty much no good reason to "4WD launch" your 4Runner at a drag strip. As previously stated, you'll lose so much power from just being in 4WD at any point during a run that your ET will be atrocious(MUCH slower). Pretty good way to become a major laughing stock if you ask me.

donomite49

he is talking about a dragstrip so eighth or quarter mile max

also look at his sig he is running a turbocharged 3.4...

this truck is capable of pulling between 3 and 5 hundred HP depending on boost and turbo size.

250000_yota

I understand what he's getting at here. If you guys remember, he turbo'd his 4runner. I see diesel guys do this all the time. Works great, as long as your semi ready for the torque steer. I watched a built duramax pull itself hard left into the center divider right after the tree last year at bandimere.

As for longevity, not guaranteed. Just don't do it very often or you will be blowing one up. You might try a pulling it out of 4wd on one of your shifts before you get going too quick.

And btw lux, my S/C'd 3.4 T100 ran a 16.8 last year. Hoping for better on opening day in two weeks. My friends and I annually run at bandimere speedways opening day test and tune and midsummer at Truckfest. I've done it for 5 years now with my T100. Prior to that, I used to run my '90 3.0 4x4. It's not for speed, just fun.

With that being said, I don't launch mine in 4wd. The limited slip does just fine. Plus, bandimere lays down a chemical called VHT. I don't know exactly what it is, but I've walked the track, and that crap makes the soles of your shoes stick to the track, so traction is never really an issue for me.

MudHippy

Where's what's-his-name? You know the guy who actually does drag race his SCed Meth-Injected 5VZ 4Runner. Texas Toast or something like that. J/K TA.

Let's ask him if he launches his in 4WD. Or if he thinks it would EVER be a good idea to...even with 3-5 hundred HP under the hood(which is laughable BTW, there's NO WAY IN HELL he's making ANYWHERE NEAR that). I'll bet money he'll say it's a stupid idea too...regardless.

EDIT: Or this other guy...previous post.

Oh and most of those diesel dudes that do do that, end up busting t-cases left and right.

250000_yota

I wasn't saying it was a good idea. I'm just saying guys do it. I've seen my fair share of trucks blow their guts straight after the 60 foot.

What I am saying is that for diesel guys like them, it helps. You try unleashing 1000+ lb. ft. of torque on the rear tires and see how well you keep it straight.

For them it's a traction over pocket book situation. At least until they have to start paying for the parts they break.

HighLux

Do you think the .2 60ft time reduction would be worth .2 seconds on the top end? Mudhippy also stated the torque steer. While manageable stock...with 4-500 hp the unequal length axles would make for an interesting launch for sure. I would be embarrassed to go down the strip unless I was in something that went faster than a 13.00

HighLux

Only a retard would launch in 4wd. With stalls...line locks...drag radials...proper rear suspension....there is no reason other than being a redneck to use 4wd on the track ever. Maybe you are thinking awd cars that have no choice...evo's sti's talon's. And even with those cars come troubles when you hit any real hp numbers.

250000_yota

All I'm saying is if your having traction problems, give it a try. But try just runnin the SOB first. You might find you don't need to use 4wd. The way I see it, it's your truck, it's your transfer case. Victor got on here and asked if the t-case would hold up. I'm saying repeatedly, no. It's his truck, I say if your comfortable with it, go for it. Just don't complain when something goes pop.

I'm not thinking about awd cars. Trust me, I know they have no choice. I help a friend of mine run his cummins for drag during the summer. We laugh at the idiots who launch in 4wd. Never in this conversation have I defended these guys for launching in 4wd. I'm just saying I watch guys do it. Like I said above, most of the time it's a lack of brains situation, until the wallet catches up.

vasinvictor

iTrader: (3)

Well this turned into quite the discussion. I don't feel bad for asking the question though, and there's certainly no reason to call anybody "retarded" over the issue. I am running 4lb of boost with a rear mounted Holset turbo and it's making pretty damn good power. I am adding 1000cc/min of methanol injection later this week and am looking to run 10-12lb boost and put down 350+whp.

I'm running 13.3 at 80mph in the 1000' so far. I don't have any traction issues off the line due to a later spool so far. I was just curious. I well aware of several, including TA that do 4wd launches with no issues in the chain drive tcase. I was simply curious of the gear drive cases's ability to take the high speed punishment.

250000_yota

If I'm not mistaken, TA might have a later year 00-02 with the multimode t-case that has the option of being used as a awd case. It has a center differential that can be locked. This might be how TA is launching in 4wd without hurting anything.

So I'm guessing your 13.3 is coming out to somewhere around a mid to low 16? Impressive Vic.

scuba

I think I remember TA did say that some of his launches required 4WD.
There was a convo here on this forum about it years ago.

donomite49

i'd like to see mudhippys face if he was the owner/driver of this viper,
probably would not be laughing...


also remember vasinvictor has an automatic.

and yes texas ace does pull 4wd launches, or claims to, in his posts. also an auto

but the taco in the vid does look like he is in 2wd with a manual trans.
i understand he is in the 450-475 HP range.

i understand the high end HP #s for a 3.4 is close to the 1000 HP mark

no proof of that so let the flames fire up!