ok guys i just purchased a posi unit with 3.73 gears and will be installing it in a couple weeks. Right now i have a "one legged" unit with 3.08. I noticed when i try to floor it off the start, my car shakes because the car is trying to grab traction. With the new posi and 3.73 gears will i be getting off the start better? Will i be getting better acceleration when im at crusing speeds? im just curious the benefits i will get when i will put it in. I appreciate any info. Thanks!!

-Tino

 

yes you will get much better off the line traction with a posi. The hopping you described may dissapear. With the new ratio you will lose some miles per gallon but it should give you overall better acceleration.

 

You will love the way you will lunch off the line, the wheel hopping should dissapper with great traction. 3.73 are awsome grears, I think, great all around gears, its true though, you will lose mpg, who carse though? Right? Have fun.

 

However, with the deeper gears you will increase power to the rear wheels when launching and hurt traction. Posi will help out the traction problem, but isn't going to stop wheel hop. It may be worse, since now both tires will hop. If you still have wheel hop after the swap, check the suspension board for different fixes.

 

sounds to me that your struts are worn causing your hopping. Ihope your car has an overdrivng gear either 5speed or 4spd auto because it will rev like crazy top end.

 

My GTA has factory posi which I tested last night and was glad to see still is functional, this car has excellent traction or the motor isnt up to snuff, it took a dump of the clutch at 2500 rpms to get the tires loose, both broke loose and there was no wheel hop.

 

Anyone who buys a car that only needs a 2L engine, but has 5L or more prolly didn't buy it for the awesome MPG, lol

It won't change too much though

 

Gears will not increase rwhp. They simply multiply torque in a way and get you into the power band faster, but if you measured it on a dyno you would gain nothing.

 

The guy didnt say it would gain rwhp, he said it will increase lunching power. Which is true, you will take off the line faster, no HP gain at all...

 

"The guy didnt say it would gain rwhp, he said it will increase lunching power. Which is true, you will take off the line faster, no HP gain at all..."

 

Settle down there. Although not measurable on a dyno you do gain "leverage". Its not necessarily power, but will help in the same way.

 

yes I know, I was just saying it won't actually give you rwhp. You will definitely see gains at the track and feel it on the butt dyno, but the real dyno won't know any difference.

 

I used to have that problem... it scared the s**t out of me when it happened. I didn't intentionally seek out to fix the problem, but I did develop a different problem in by rear end that lead to a rebuild. The rebuild lead to a 3.23 gear ratio over the stock 2.73 ratio and now I get the one wheel peel all the way through first along with a powerful CHERP into second at around 4500 RPM. No hopping. (Not to bad for the stock LO3).

I don't know if the rebuild has something to do with it or not but the carrier was broken (was that way when I bought the car - unfortunately I did not realize it) resulting in excessive play in the axle.

I'm looking forward to getting my posi rearend (with disk brakes) so I hook better (and stop!).

The thought of putting a posi in leads me to another question, if you know how to rebuild a rear end includig changing the ring and pinion, look for my topic psted on the board.

 

Dont worry, Iam just blabbing, not at all getting upset or angry, just talking!!!

 

Hey, I was just messing around. I was agreeing with you anyway that he didnt necisarrily post that he would gain rwhp just power to the rear wheels which could be interprited in more than one way.

Ben