with the 6 speed teh 3.9 is not that much of a jump from 3.5. i mean it does help but does anyone make like a 4.10 or 4.30 ratio.

perfect example is many ford and gm cars. Mustang going from 2.73 rear end gear ratio to 3.73 gained myself and my buddys a average of 5-8 tenths.

gm car ie camaro-s10 3.42 to 4.10 4 tenths

does anyone else make gearing higher than 3.90 because 3.5 to 3.9 isnt that much of a jump but 4.10 would be pefect

 

because its insanely expensive to do the R&D and the demand is nill. Frankly I think we are lucky there is any sort of FD option for the Z as miniscule as the market is

 

gearing is killing these cars, ill have to call 350evo tomm see if they are coming out with 4.XX gearing.

or do what i think 3.90 gears with a 25 inch tall slick

 

I always thought the same thing. 3.9 isn't much, so I started off with a clutch and flywheel upgrade in hopes of some higher gears to be released

 

Tilton and 3.917 is fun...... I would say any more than 3.9 and 1st gear would almost be killed... with the setup I have now I have to be careful in the rain or most mornings.....car likes to go sideways... even with the 275's

car wont even do 60mph in second gear anymore....... unless you get your ECU bumped to 7200 then U get enough just smell it...... but sometimes if you push too far because of the Tilton quick REV's..... you hit the limiter......

 

Personally, I would suggest driving a Z with the 3.9 gear (unless you have already) before wanting an even higher one....... As redline350ZZ mentioned, I can't even imagine 1st gear with a higher final drive. As it is now with the 3.9 (& JWT flywheel), 1st gear lasts about 1/2 as long as stock gearing, floor it in 1st from 3k rpm up & it just smokes the 275's thru redline and puts the Z squirrel-y shifting into 2nd. Additionally, with anything higher than a 3.9 you will have to shift to 3rd to reach 60 (can reach 61 in 2nd with the TS reflash w/ redline at 7100 rpm) - for those of you that care about 0-60 times. Also, for those of you that care about top end, even "just" going up to the 3.9 gears, the top end looses 10-14 mph. And for daily highway driving, the 3.9 gear raises the rpm's up about 350 rpm's higher at 80 mph in 6th gear (3350 vs. 3000 rpm), thus a little more engine revving on the highway & a little less mpg. IMO, the 3.9 final drive is just about as "radical" as I would desire for spirit-driving & daily driving. Personally, I wish I had the $$ to change the tranny ratios so I could alter 6th gear for highway cruising with the 3.9 gear.

I'm sure there may be a reason why an even higher final drive gear for the Z may be desired, but for the life of me I can't think of one - maybe too early in the AM for my mind to function correctly - ha! I remember putting in a 4.10 rear in my old '67 Mustang YEARS ago & it did make an excellent difference, but the ratios in its tranny were so low it took a 4.10 to make a real difference - the Z ratios are already pretty high.

Again, try to test drive a z with the 3.9 & see what you think. It's pretty freakin' cool!

 

yeah the 3.9 gearing by itself I don't think is quite the "holy crap!!!!" difference people make it out to be - seriously it'd take like 200 more whp to make me really feel like that.

but combined with all the other NA power mods, the gearing is perfect. As is, my setup will break the tires loose in 1st gear at around 5000rpm's. Of course I still have stock tires/suspension though - but do have a nismo LSD and I think the LSD is really keeping me from fishtailing sideways or breaking tires loose as much. I think as soon as I get decent, bigger tires and suspension it'll be perfect for NA.

Really though, there's a lot of cars with really high gearing like the STI and elise, but they have differently setup transmissions that us and having a higher final drive is what's needed to balance things out.

 

If you ar going to drive on the street, and you think the 3.9 FD gearing won't be enough, then I recomend that you look into changing out the gearing in the tranny itself. That's where some speed can be found. I think a 4.XX FD would be too insane expecially for the street.

 

i'm pretty sure the car wouldn't accelerate any faster with shorter gearing than a 3.9... the ratios would be too close, you'd be shifting too much. it would be one thing if it were a tq-less spoon engine in a honda, but we have some tq in our VQs. there isn't a need to keep the ratios that close. even with the 3.90 i don't think your going to run that much faster in the 1/4 because youd be limited to 104mph in 4th at the stock rev limit. hitting 5th is going to slow you down unless you have some serious aftermarket work done to the car and can shift with complete disregard for your drivetrains health...

 

Remember we have a 6 speed, not a 5 speed like most Mustangs/Camaros that means our 1st gear is already pretty low. The 3.9 is a very solid improvement over stock. I picked up about 2mph on the 1/4 mile trap with it. The 3.9/test pipes/Tilton put me at 13.3 on street tires. I agree with Sentry though, it works best with other mods.