BayAreaSS

iTrader: (10)

I have 4.10s and my car runs just as good as yours. I'm not a big gear person either though.

Bitemark46

You do realize that your argument of staying in the powerband longer (time wise) = less acceleration force? 2.73's will keep you in your torque curve (aka rpm range) much longer than that of a 4.10. Which do you think will win in a drag race? This "blowing past" the curve is a common misconception. It may feel like that but what you don't realize is that your acceleration g's are greater with the steeper gears. If you still don't agree I can break out the math for you.

HioSSilver

iTrader: (8)

Well im still not agreeing. For sure you cannot go to one extreme or the other. your not taking into acount the gear change either. You have to change to the next gear earlier with the lower gear which leaves a split second for the taller geared car to have more gear multiplication. It's not as simple as simple math. When I first changed gears in my car years ago we had a program we plugged my Dyno #'s in to chart acceleration with the gear splits. The stock gear(3.42) & the 4.10 charted to 150mph in the same time. The 4.10 of coarse took off faster but from 80 on the 3.42 started accelerating better.

m_liel

Maybe for your application you didn't see desired results. But when my car was stock with nothing but original SLP mods (blackwing/cat-back) I saw a consistent .2 gain in the 1/4 with 4.10's. With my experience with the LS6 loving high-rpms I wouldn't run anything less than 3.90s with a T56.

LOL at gear being a "tuning tool". . Some people have to sound so car savvy.

Bitemark46

Thank you. I did forget one small part of the equation for him...Driver error.

Hihoe- to put it to where you can understand it. Use this calculator. I think the math might be a little too indepth. But pick any referencable car from the drop down. There is a c6 so the hp and weight is probably close to yours. Do a test with 3.90's then 4.10's. Once you hit calculate it you can see the metrics for the different mph intervals (speed vs time, acceleration vs time, distance vs time). You'll see that in all the categories the 4.10's are quicker in every aspect including 80-120 that you said the 3.90's were.

http://vlsicad.ucsd.edu/~sharma/Potpourri/perf_est.html

Stopsign32v

iTrader: (1)

So you rev your motor to 6,800rpms per you but you make your peak power low in the RPMs? And how do lower gears "use" more power?

HioSSilver

iTrader: (8)

I rev limit it to 7000 stoppy. The engine carries the peak power out flat. Lower gears use more power because they turn faster. That uses power and creates more heat and/or the some power gets disapated as heat. Lots of guys have lost rwhp from changing gears/rears.

Bite I could not get the website to work, maybe because I'm on google chrome. All I can tell you is the change from 4.10 to 3.90 was a noticeable seat of the pants difference that showed up greatly at the track. Like I said the program we used on the race team I worked for the 3.42 was starting to be better above 80 and was alot better by 125. I have more faith in that software that we used to gear our hewland gearboxes vs internet download.

03turbomach and I set the rear up and we both noticed the difference. It just seemed like it pulled harder everywhere. Actually loaded the motor instead of just revving. Track times confirmed it.

LT1PwrdZ

iTrader: (1)

Good runs by both cars, video sound was badass.. Good times

snake95

For a lot of people, one tenth would justify the gear change. Believe it or not, a majority of people don't race trap speeds like you do. At the track, it's who gets to the finish line first. You race trap speeds because your car "is set up for road races" or whatever you claim, so it is convenient for you to have an erection over trap speeds. You always claim what suits you (in this case gear giving you less trap speed at the track) is how it is "supposed to be". I seriously don't understand how someone like yourself can be so biased and not realize how biased you are. End of story. If you like roll races, less gear, track, more gear. Not everyone has the same taste as you...thought you would know this by now.
...and LOL at you tooting your own horn "maybe this is why my car runs like it does"...I think everyone in this section knows who the king of but if when but but my car's a dd and this and that excuses is when you lose.

corysmach1

Thanks for they guys giving compliments!

Heater

LuLz....

HioSSilver

iTrader: (8)

You've got it all wrong. And then you take what I said out of context instead of trying to understand it. Sure my car trapps good. But 11.1 is pretty quick also. As everyone knows trapp speed is a good indicator of how a car runs once it gets moving. If I can change gear and pick up mph but et stays the same, then I'm gonna change the gear. The car definently don't run like it by does because I did things like others have said or have done. Not biased at all, clear open minded thinking to get there. It would be dumb of me not to admit that it runs good(et/mph indicates that), that's not tooting my own horn. I think it could go faster, but that's not gonna happen now because the clutch is slipping and I'll just go ahead and put the 7 in sometime soon.

Stopsign32v

iTrader: (1)

You really think the gears make you lose power?

How do you figure "lots of guys have lost rwhp from changing gears"?

Stopsign32v

iTrader: (1)

So higher gears loaded the NA motor more making it faster? whadafuk??

HioSSilver

iTrader: (8)

Look around, guys dyno less all the time at the wheels with a gear or rear change. Some guys has lost as much as 10-15 whp changing to a 9".
That's what it felt like. Made it feel like it started to use the tq.

916 BREDWNR

A 9" will lose a tad amount of power due to the pinion being well below the ring gear centerline, thus increasing friction resulting in higher gear lubrication temps. With that said, you're looking at a 3-5% hp loss - very minimal. A gear swap in a stock 10-bolt like yours would probably see no decrease in power.

HioSSilver

iTrader: (8)

You do the math on 3-5% loss @ 400rwhp. Then please tell us what it is.

I have seen guys claim 3-8 on a 10bolt. Could've been the day or a different dyno but more gear will use some power.

916 BREDWNR

My point is, you have a 10-BOLT. The 9" rear is a completely different animal in itself. With a 10-bolt your not going to lose much if any, a couple hp at most. And the gains you see in acceleration are well worth it.

Stopsign32v

iTrader: (1)

Oh my.... I'm seriously dying over here.

HioSSilver

iTrader: (8)

Yea man...I said the same