It has been a few years probably about 4 since my last post. I finally have time and money (at least a little of both) to start tinkering and fixing up the old Camaro. I bought the car in college about 10 years ago where I built a 383 fully forged bottom end with comp cams XE284 grind. I broke the T5 in the matter of just a few months and have a built 700r4 in its place with 3000 stall. The rear end currently installed is a 3.08 one wheel peel. I picked up another rear with a zexel torsen locker and what looks like 2.73 gears (counting the ring and pinion teeth). With the current stall it flashes to 3800 with current gearing and will rip both tires loose even though it has an open diff. I want more grunt and want to get into that powerband sooner. Advertised the powerband for the cam is 2300-6500.

So 2 questions I have is should the 4.10/4.11 gear get me into the powerband sooner, I know with the 700r4 1st gear will basically be useless but I don't want a large drop in RPM when I hit 2nd gear and to stay in the powerband of the cam. 2nd question this might be more for the transmission/drivetrain section but will it bring the flash of the stall down with the lower gears allowing the engine to move the car easier?

Thanks,
Chas

 

For daily driver street use, I wouldn't want to go more than 3.73 gears.

 

We've found that the 700R4/4L60 and 3.73 gear is a good mix. 1st gear is entirely useable. With a 4.10, probably not so much.
Regardless of the rear gear you choose, you'll still have to live with big split between 1st and 2nd. It'll still be 6500 to less the 4000 on the 1-2. Not the greatest for drag racing unless you have properly spec'd converter. The 9.5" Yank never lets the RPM drop below 5000 under WOT acceleration so the wide ratio gap isn't as much of a factor.
As for the stall, the highest flash stall will always come from an off idle blast. You're unlikely to notice a difference on the street as the traction won't be there with whatever gear you have.

 

how are you measuring converter flash? are you data-logging it and looking at the rpm trace or ?

 

Not sure about the OP's method but mine comes from testing and observation. And the only meaningful observations come from the track where lack of traction doesn't mess with the results.

 

yea, very true. I can only speak for my personal experience and I wasn't relay able to "tell" when the converter flashed. With the datalog feature of the holley sniper setup, It is just plain as day and there is no guessing. The datalogs can't lie, so I can go off of the hard data.
I might have initially assumed that i was flashing my 3,400 rpm converter close to that number, but datalog after datalog on the track shows that it flashes right around 2,800 rpms when I launch from a 920rpm idle. if I launch from 1,700 the converter flashes a little lower (around 2,500rpms) but my 60 foot times are slower. I'm eager to see how the OP's situation continues.

 

No data logging motor is carbed 700 holley DP

No track time for me, not worth going with the current 3.08 rear.

When I hammer down the engine hits 3500-3800rpm and holds it there until the car picks up speed and RPM rises. I think I am using the term correctly. I do realize that the 1-2 shift is wide and the RPM's will suffer but this car won't see any or much highway speeds it's mostly for around town cruising and an occasional track visit once I get it up to my standards. A while ago I went and figured out what the RPM would be with several rear end gear ratios but can't seem to find the data. Anyone know what the RPM on 1-2 shift is for 3.73 compared to 4.10 say from 4500-6500 in 500 rpm increments?

When I bought the stall it was an advertised 3000 stall speed but I'm not complaining it is a little higher I should have accounted a little more for the engine torque and hp at 3000rpm.