mkent

i'm also interested in somebody answering these questions, does anyone have a stall on their 273 car?

allmotorta

I know at least one person on here has a stall and 2.73's, I just don't remember who they are. They loved it.

CODY BEHNKE

I think all F-Bodies with the TH700 or 4L60E have a deadspot somewhere.

That great little spot right above the point where it can't shift into 1st but can't pull hard in second is annoying.

40-49mph sucks in a 2.73 car but right at 50 mine takes of again.

mebanditws6

I have yet to see my friend's 97 Z 2.73's with a couple bolt ons chirp on 1-2. The car is in very good shape, and he has beaten a stock 95 vette 6spd with a good driver before. With the old tires (stock) he could spin them ok off the line but still not on 1-2 unless maybe on a really new slick blacktop on a good day. With the new tires (stock) traction is not that much of an issue at launch. Even a stock LS1 auto won't start pulling on the Z until about 65 and on and most of the time my friend gets a small jump cause of the LT1's low end advantage. I used to think the 3.23's were better but now I'm not so sure.

Maybe I just need to testdrive another LT1 and make sure it has the 3.23's and race the 97 to find out for myself... 3 of 4 times the dealer didn't ride with me so this should't be hard



Jason

94Z28DOJ

2.73's+N20+slicks=

mkent

i took my new 97 out one last time tonight before starting on the intake leak and it hazed some black marks about 100 yards i could see when i drove back up the road but you're all right, it will not chirp the tires when it shifts to 2nd.
i stopped and did a burn out too and when it shifted to second, those 255 wide tires hooked and the motor bogged down cause of the high 273 gearing.
i still think i like them though cause it hooks up off the start and then pulls like a *****!

IrocManiac

I've always been a fan of 2.73 geared cars. LONG legs for the highway. The lower gear ratio (Numericaly)helps big time on the traction. Also the lower the gear (numericaly) the better it tends to be for a car on the topend if they lack high end power. The LT1 power is great in the middle. Nothing like a downshift to second at 65mph on the highway

1982z28with18s

I used to be able chirp mine between first and second with the stock 245's. Plus you also have to remember this. With 2.73's second gear starts at around 45-50 not 30-35. Thats a big reason most 2.73 guys can't chirp their tires. I still like em' tho.

dlx3200

My 97 Z had 273's but I changed to 410's. Now I have the problem with traction. I raced a fox body mustang when I had the 273' s from a 65 roll. It got real bad real quick for him. I think it's all on what you like but the 273's do hook good takeing off.

rskrause

If you had all the necessary data, the outcome of a race like this could easily be explained/predicted. What you need is a torue v. rpm plot for each motor and the transmission/rear end ratios. You multiply the torque and the gear over the time period that the race takes place. The car with the highest average torque wins. My explanation isn't very good, but this something that's easy to graph or to understand visually.

I'd guess that the 3.23 car would be faster off the line if there were plenty of traction. So in a formal drag race with adequate tires it's probably faster in a 1/4 mile. I wonder which has better top end pull? I'd bet it's the 2.73 car by a small amount. The 3.23 car will need to shift out of 3rd at ~135mph. At 135mph the 2.73 car is still in 3rd at ~5,000rpm. While that's a bit past peak torque, the torque mulitplication is 2.24 vs. 2.73. But in the 1/4 with a near stock motor I'd still bet on the 3.23 car which would be right in the fat part of the torque curve in 3rd while the 2.73 would need to shift into fourth before the traps.

Interesting.

Rich Krause

Gripenfelter

I'd like to see what someone would run comparitively speaking at the track going from 2.73s to 3.73s.

Theoretically an LT1 likes 3.73s for low end grunt but in reality it becomes alot harder to launch because of the loss in traction.

mebanditws6

I think it was Patman who said he got better 60' times with nittos+his old 2.73 LT1 than his current 3.23 LT1 at a track. Not sure what his 1/4 time in his old car was but his current one he has gotten a 13.8 with just nittos. Anyone else had similar results?

Jason

mkent

i believe you meant shifting to second around the traps since second gear holds till a little over 90mph.
i bet if you had a motor that revved 7000-7500 rpm and a set of 273's that would be the way to go cause you'd just have the 1-2 shift and that's it...maybe?...lol atleast that's how it would be if I created the world!

Fast Caddie

I think both of you mean shifting into third before the traps.

Anyway, I like my 2.73s. They are freaking awsome from a 60-65 punch and from 20 too. I think the PCM locks 2nd at 25 mph b/c I can downshift into 1st from a 20 hammer, but at 25 it just stays in 2nd and has to pull from about 2500 rpm (I think). Plus I've been getting almost 24mpg lately, which is good for a college student budget.

mkent

i hear that! college student budgets suck don't they?! i can't hardly afford payments on a car, let alone gas for it, but yeah i'm guessing i'm gettin around 22-23mpg with this car around here, i got 27+mpg from Greenville, SC to Charleston, WV monday night when i bought the car!...and that was cruisin at 85 mph through the mountains!