When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
i have a 01 z28 bolt on car a4 with 2.73 gears my problem is the car is faster when it is spinning if I heat the tires up it bogs bad car spun off the line and went a 12.96 with a 2.04 60" pulling around the water with drs just doing a dry hop When I heated the tires up it went a 13.05 with a 2.00 60" I'm wondering will a 3.42 swap help with this I know get a converter but I'm still saving for it I found a 3.42 rear for $200
input would be appreciated
I was thinking the same thing but you hear so many people say that gears don't make a difference the way the car launches you can tell it's not happy as bad as it's bogging I was thinking with a set of 3.42s it will get it in a better rpm range off the line thus lowering et
I was thinking the same thing but you hear so many people say that gears don't make a difference the way the car launches you can tell it's not happy as bad as it's bogging I was thinking with a set of 3.42s it will get it in a better rpm range off the line thus lowering et
A converter will get you to a higher rpm off the line. A 3.42 will give your motor more leverage to get the car moving, but your launch rpms will be the same. I've had 2.73, 3.42, and 3.73. My mph difference is within 1 between the different rear ends.
So you think the car will still bog through the 60ft even with a gear change? I doubt my 1/4 mph will change anyway but I find it hard to believe the car will put up same numbers with 2.73s than with 3.42s as bad as it bogs with the drs
It will help. Not sure if it will eliminate the bog. Leaving on the power that the motor makes at <2000 rpm is what is causing the bog. 3.42 will get you out of the bog quicker is all. For $200 I say it's worth it and then start saving for a converter. I paid $300 for my 3.42 with brakes.
Last edited by Hardtop Brian; Nov 2, 2016 at 08:19 AM.
It will help a tiny bit with the stock converter, and for the money it's probably worth it anyways. But once you have a good converter the time difference between the gears won't be huge.
Though it will be a little nicer to drive the 3.42s with a nice sized converter.
I had quite a different setup than you did, but as an example, here is what happened when I did a gear change on my car back in the day. 381whp setup, 3200stall, th400 transbrake.
I had quite a different setup than you did, but as an example, here is what happened when I did a gear change on my car back in the day. 381whp setup, 3200stall, th400 transbrake.
3.50 gear:
1.84 sixty
7.84 eighth mile
4.56 gear:
1.61 sixty
7.42 eighth mile
Only thing that was changed was gear.
Seems like the better sixty got you better times.. But maybe a 4200 stall instead of a 3200 stall could have made similar improvements..
There is a point of diminishing returns. I went from a 3.73 to a 4.10 and ran an identical time. I think that's because my car is light, has a 4k stall, and a broad powerband. It simply didnt need that small gear improvement. I think each combo will react a little differently.
Seems like the better sixty got you better times.. But maybe a 4200 stall instead of a 3200 stall could have made similar improvements..
For my setup back then, I just needed more power on the hit. On the 3.50 gear, "Dead Hook" would have been an understatement. Yes it dead hooked, but it wasn't even anywhere NEAR to being able to spin the tires (275-pro tire). Comparatively, I now hit the same setup with a 10psi boost launch (Prob around 650whp), and it still dead hooks to a 1.25 sixty. lol
So yeah, long story short, for that old setup I had, I literally just needed more starting line ratio (Read: More torque on the 1st gear hit). The sixty was what they would call "power limited".
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Slideshow: The controversial Ferrari F6 swaps its original flat-12 for a Corvette Z06-derived LT4 V8 and sends power to four rear wheels through a custom-built drivetrain.
7 Most Reliable High-Performance Engines GM Has Ever Built
Slideshow:These GM engines didn't just make huge power, they survived abuse, boost, track days, and six-digit mileage with a reputation for refusing to quit.
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.
Will gears help a bogging car 
