Should a bone stock 91 3.1 (116k) 700r4 be able to roast the tires from a straight launch ??
I can only break the tires loose if I punch it on a right turn.
It had a BASIC tune up 6 months ago..

 

I've never driven an auto v6 thirdgen, but my five-speed 2.8 will roast one straight line halfway through 2nd.... That's on cheapie tires though. Has a lot to do with how you launch, I suppose.

 

my 91 firebird(when its running) 3.1/AT with 148k, with stock wheels, will burn the one tire, till mid 2nd gear.

 

that's because you're not running on all 8 cylinders.



Seriously though, even my 305/700r4 wont light 'em up unless I stand on the converter to almost the stall point.

 

Roast them, no. In stock form my car would scrub the tire (singular) a few feet from a dead stop at idle, and flooring it. The passenger rear tire is easily smoking while doing a power brake (at the track, I can get both to spin if I only let the driver's tire in the water).

 

Thanks for all the input guys...I just wanted to compare to known properly tuned cars to see if mine was performing at/close to its best...or was there more to be gotten out of it.
Maybe bump the timing to 12 or so??

 

my 2.8L automatic will not roast the tires from a stop by flooring it. The tires will spin...actually the passenger tire will spin, but probably no smoke and your moving. The only way I can "roast" my tire (again only the passenger side) is by having one foot on the break and the other on the gas.

 

Freshen up your slush box. new fluids n filter.... look for signs of wear.

 

why do you want to roast the tires? it has no bearing on performance. lets put it this way my friend had a 79 firebird with the miserly 301 (anyone who knows pontiac will know how big of a joke this motor was) it would flat out roast the tires till he let off the gas. if he ran a 1/4 miles run he woudl be lucky to pull a 18 second run though I bet.

or for instance take this. one car with two sets of tires. one set is going to be drag radials the other worn out weathered sun beaten tires. when he puts the drag radials on does his car lose power and run slower now that he can't get grip? with the beat up tires now that he can spin the tires like crazy does that mean he is going to run faster?


all spinning the tires means is lack of traction. if you want me to show you I can take your for a ride in my supermobile 76 accord with 68hp and 2 inch wide tires and show you some good tire spin yet comes in a car that is slower then 2 people trying to push a 64 lincoln up hill with 6 people sitting in the car.

 

, I had crappy 25 dollar tires that came on my car, and they were what I could roast off, which really actually impresses high-school kids...

But in the real world, traction and no spinning means a lot more, and the person who can drive to the limits of his tires and not beyond will be faster everytime. Now that I bought Iroc's with more expensive tires on them, I can launch way better, and closer to the limits of the engine, and as a result, I would go faster on the dragstrip with less wheelspin.

My 2.8 V6 >faster than> Pontiac 301

 

To answer your question a little better, my stock 2.8 would rarely break the tire (open rear) loose when "launching hard" from a dead stop. I could do a break stand with just one tire spinning, but it wouldn't ever shift to 2nd. And when it did, burnout over with. A stock 3.1L.... It could probably do the same, maybe a little more. For a stock engine, you're probably doing just fine. They don't produce gobs of wheel torque in stock auto form with the 3.42 rear on econo tires.

My current setup with 4.11's blah blah, i need to feather the throttle when launching in 1st, breaks traction when shifting to 2nd, and will do break stand burnouts almost through 2nd gear. See my sig for more mods.

Again, it has no real bearing on performance, but to develope enough wheel torque to overcome the 1500lbs of static friction the rear wheels have with the ground is something look at.

 

if you don't mind me asking and this is more for curiousity then anything but where does 1500lbs of friction come from?.


and it really isn't that big of a deal if it is 1500lbs though to break traction with the wheels. gearing multiplies torque, the shock from the initial jolt will help. now to keep them spinning though is another story even though when they are spinning friction generally goes down vs as a stop

 

well, just a guess. I'm just saying that for a motor with just enough power to barely break the tires loose, its good to know that you can. Like when I started doing mods to mine, it was HUGE accomplishment to finally be able to do two wheel burnouts!

But ya, tires can grip more than the weight put on them. So if the rear puts down 1500 lbs on the tires, the tires are slightly larger than 1ft in radius, then the force required to spin them will be slightly larger than 1500ft*lbs. But if you can spin them in 1st gear, you may not be able to in second. You get the point. I did a big spread sheet that uses the dyno chart and gives est wheel torque in every gear so I can do hypothetical races with my friends.

 

Personally, I spent money on suspension pieces and tires so that I don't lose traction.

 

With the crappy tires I used to have I could spin them any time I wanted on dry pavement. I put some decent tires on and now I can't. The difference in the rain is even more dramatic!!

If you really want to be spinning tires on launch you shouldn't be driving an automatic tranny, 140HP, 3300lb, 15+ year old car.

 

 

ah come on it's only a v6 how can you lose traction

 

sarcasm???

 

Dailymotion.com/culdesac fun No Traction? Dry or wet. 1st and 2nd gear are fun.

 

You should consider upgrading your motor to a 3.4 V6/60 from a 93-95 Camaro. You can maintain an otherwise completely stock look, but you'll gain around 20hp and 30ft-lbs of torque with a totally stock motor. You can significantly increase that horsepower by going with an H272 cam from Crane. When used with a pair of roller rockers (1.52 to keep it conservative or 1.6 for a bit more power), you can easily achieve ~185hp from the motor and still have your car look 100% stock. (No one can tell the difference).

Everything bolts up...

You'll want to strip the block down to just the block and heads. Re-use everything from your car, EXCEPT for two items:

1 - Injectors (use the ones from the 3.4)
2 - Flywheel (use the one from the 3.4).

 

a turbocharger setup is another option

click the pic

 

How about a turbo charger AND a 3.4?

 

how about just cheating and sitting in the water pit with a line lock on

 

My 3.1L could easily burn one stock 215 tire with the open carrier rear end and both after I put in the posi-trac 84Z rear end. It can't burn my new 275s however.

 

lmao i dont have a line lock,the rear brakes were still applied, i usually dont roll threw the water box unless i have the slicks on the car,but on the 1/8th mile track there is no way around the water box

 

When my 3.1L auto was stock the only way to spin the tires in a straight line was do a break stand. Its a one wheel wonder but if the gears catch you can get the rear driver tire to spin but not as much as the passenger.

 

Sorry, no line lock...

 

eh close enough. my 74 maverick could do that just as easily with it's underpowered broke down I6 when using the brakes so . though must say when using studded tires it's interesting to see the road after that.

come on isn't once enough to correct me but still I stand by it is close enough to brake stand it as it effectivly does the same thing by locking up the fronts while allowing enough for the rear wheels to spin

 

My intensions weren't meant to correct you bro, just underlining the fact for the others reading this that Dave does not have a line lock. Got hit with a pretty bad snow storm this weekend, but it should now be finally over with. Dave's '89 is just about down to it's stock weight, and with the addition of the 3.42 gears replacing the 4.10's, it should make for quite the interesting time slip, next time....

 

nah it's cool just giving some crap.

 

kinda OT but life is easier on this board when you log into profile settings and put rx7speed on your ignore list. Besides my vid rant never seen her post anything worth reading. Wish it could also block when folks quote her.