McRat

No.

Apparently the problem is that with the M12 gear spacing, you are running too low RPM after the 3-4, and you lose any 1/8mi gain at the 1/8th-1/4mi split. Sucks.

Wifey bought 4.10's for the Meanie, and we are not running any faster, and no quicker.

Talk about an expensive experiment! OUCH!!!

But I guess if we up the HP about 50rwhp, it will be the best gear selection. Can anyone lend me 50rwhp??? I'll give it right back. Promise.

PS - Got the boot with a 11.90/116 w/1.71 60' against a previous 3.42 best of 11.92/116 w/1.86 60. Same weather, same weight and motor.

Cliff Notes: Do not get 4.10's with stock Z06. No real gain.

The Guy in MY 99TA

Could it be tht the clutch isn't holding up good enough? The 60' showed an improvement, maybe the clutch is getting kinda slippy on the top side? There was a good improvement on the 60 so there should have been a time drop. Maybe the weather was the difference? Was there a calculated DA?

I wouldn't rule the gear change worthless yet. I'de do a little more flogging before I said it was useless.

Josh S.

McRat

Nobody was more surprised than myself.

We've run it now about 30 passes with the 4.10's. It runs faster in the 1/8th, but not the 1/4. The car goes through the lights about 6000rpm. But you are in 4th from the 1/8 marker on. If we crossed the lights at 6500-6800, we'd be rockin'. But we are spending too much time in the 4500-5500 range. Nice thing about the Fbody, is that 3rd and 4th are closer together, so you don't spend any time out of the peak power at the far end of the track.

Should be good for nitrous though, where the torque takes over in the midrange. Now to talk Kat into letting me spray it.

McRat

Oh, the clutch works sweet. I've cut a 1.66 with the 4.10's as new best 60, and it holds like glue down the track.

Time for more HP. More power fixes all illnesses.

unit213

You running 11.90's on a tire and a stock motor? God, I love Z06's!

10.5 Dave

iTrader: (5)

I just switched to 4.10's a couple days ago.I plan on a aggressive H/C,intake and longtubes with a 100 shot.I think that they will help me when the other stuff gets put on.I think it will be a blast to row through the gears with 480-490 rear wheel in a 4.10 geared Z06.On the spray it should be 600rwhp,I hope the half-shafts hold up to 6000 rpm dumps on the spray at the track.

Villain281H

iTrader: (5)

11.90s with only mods being a 4.10 gear swap and a sticky tire?

McRat

Oh yes, you WILL be "rowing" through the gears. All shifting is done in the first 7 seconds of the pass, and the first shift is while the tires are still spinning. Like getting shot outta a cannon!

We were crossing the lights at 6000 with a 7000 rev limiter at 117. I don't have a calculator on me, but that's about 135mph peak trap speed with a 7000 limit which I consider safe on a stock engine. If you add 200rwhp you will gain about 20mph trap, which will put you on the limiter at the lights. That will ROCK!!!!

PS - It is truly amazing of what these cars are capable of. I don't powershift, I weigh 275lb, and we never get negative DA here. It's MOTOR baby!!! LS6!!

Got Me SOM

iTrader: (2)

Sounds like you need more cam now to take advantage of the new gearing. ; )

McRat

The answer would be to aim the HP increases at the 4500-6000 area. If I give up any power at 4500-5000, I will actually go slower. The correct cam with a smaller LSA would help, but I'm thinking long tubes will pick up the torque in that area. Believe it or not, but the stock Z06 cam is actually pretty hot. Perhaps too hot for 4.10's. The best power is from 5500-6500.

Another thought is switch out trans with a C5. You will not drop as many RPM on the 3-4, and stay in third longer. Plus your OD gear is steeper.

But I'm getting tired of getting "the boot" everytime I go to the track. I should really get a cage first.

Terry Burger

iTrader: (4)

McRat, want to sell them?

McRat

We are thinking out our options. I will give you a shout if decide to sell.

Terry Burger

iTrader: (4)

Cool.. The basic problem with your car I think is a) you already cut good 60' times with 3.42s (due to the Z06 1st gear I presume), b) you don't have enough MPH to take advantage of the 4.10s. You'd need to trap around 125mph (~6600rpm?) for them to really be an advantage.

I've always said gears are overrated in most applications. Another alternative might be for you to switch to a large camshaft/spring. If you want to go that rout I might have a perfect one for sale/trade.

66ImpalaLT1

Good to know. I just put 4.10's in my C5 this winter. I think they'll help me a lot with MN6.

hondadream50

In a 2002 z28 Ls1 m6 what should my quarter mile be if i changed my gears to 4.10..? WIll I beable to drive it on Highway speeds going 70mph?

CHRISPY

traction could be an issue as well especially if you are spinning through first and into second. That is 2mph or more right there.

When I rode in a stock Z06 I was AMAZED how aggressive the gearing in the first three gears was compared to the f-body 6 speed ratios. If I owned a Z06 I wouldn't change the gears at all. They are setup very well

z98

No problem. You'll only be turning 1800 RPM or so in 6th.