fire-chickens

at in a 1996 firebird formula m6 with stock 3.42 gears what MPH would you have to shift from 4th gear into 5th? the car has long tubes loudmouth 1 cat back and an intake. stock engine internals.

MasterTomos

iTrader: (15)

Whenever it redlines? Go out and find out on a straight open backroad

My car goes into overdrive around 135mph I wanna say? thats with A4 3.23 gears...

Im sure someone will chime in, as it's all mathematical

brucer

you hit the rev limiter at 5800rpm unless you've had it tuned..

fire-chickens

i know but i was wondering what speed i would be running at just as i shift into 5th. i topped 4th gear out the other day but didn't have enough ***** to look away from the road at those speeds, but i do think i noticed it was at 130mph.

Low N Slow

iTrader: (4)

5800 RPMs in mine is 126MPH and 6500 is 143MPH in fourth gear according to datamaster

noice

I have different gearing than you, but all of my top speeds have been done in 4th. I had the same problem as you, every time I looked down too much of the road was going by so I stopped looking at the speedometer,

*02WS6TURK*

iTrader: (13)

Sounds to me like it's time for some 4.10's FTW!!

Jcl_96TA

iTrader: (1)

I'm not sure how fast they go stock, but both of my 96s would bury the spedo. They are both a4 cars probably like 160ish. My friends M6 would do right around 130 in 4th though for the op.

SS RRR

iTrader: (2)

www.f-body.org/gears

fupa

iTrader: (4)

exhaust will have no affect on what speed you will be in a given gear, but with that being said.... Ive have seen my car at about 40-43 in first, 65ish in second, 90's in thirsd, 125 in fourth, and cut out at 155 at 5500rpm in 5th. this was a bone stock 95 M6 with 3.42's

Slow94Formula

iTrader: (18)

Mine is stock with 3.42's and on a GPS "top speed" setting thingy it said i was doing 115 and I ran it right to 5800 on the tach. Although, my stock tach may be a bit off. My car hits the rev limiter at 6k according to the tach, but I have no idea if the car has a tune in it or not to change the rev limiter.

Puck

iTrader: (17)

Tach reads high on these cars.ounds about right.s

Slow94Formula

iTrader: (18)

According to the chart on that page my car tops out about 10-12 mph too soon. Why would that be? I'm positive that the gears are 3.42.

chavez885

iTrader: (12)

Unless it's a manual your car did not come stock with 3.42's. Only options for A4's were 2.73's and 3.23's (unless a 93)

That chart is pretty accurate, my 4th tops out @ 140ish with rev limit of 6300 (275/40/17's) Did it last Saturday.

Slow94Formula

iTrader: (18)

My car is an M6. This thread is about an M6 topping out in 4th...

quik95lt1

iTrader: (7)

do the math.........

stock tire = 26" tall
so ur roll out is......26*3.14= 81.64"
81.64/12= 6.80 Foot Rollout

5280/6.80=776.48 Revolutions per mile of the tire

Now assuming a 5800 rpm redline....in 4th gear which is 1:1 gives you a driveshaft speed of 5800

So.....with 3.42's out back

5800/3.42=1695.91Revolutions per minute of the tire

We know the roll out is 6.8 feet as calculated above sooo.....
1695.91*6.8=11532 feet per minute
11532/5280 = 2.184 miles per minute
2.184*60= 131.04mph

so yep u were right at redline in 4th you should be crusin around 131 mph....
follow that formula and you can do the math beyond that.....

try this for math......mine will do 150mph in 3rd gear converter locked.....with 4.56's out back and a 28" tire.......whats that rpm?? (A4 3rd gear = 1:1 Ratio)

z_speedfreak

iTrader: (3)

math makes my head spin!
lol I'm lazy> http://www.wallaceracing.com/calcmph.php

fupa

iTrader: (4)

You say your sure about the gears, but not the tune.... Maybe it had a tune before for differnt gears but they are not in them anymore.

And what size tire are you running?

Slow94Formula

iTrader: (18)

Good point, except the fact that when I let off @5800 rpms the gps said that the top speed that it had gone was 115, and the car also said that I was doing about 113-114... so, the speedometer may be off, but it isn't by enough that it would imply that I had a tune for different gears. The tire size is 275/40/17

Tonight I tried out 3rd gear and ran it right to 6k. The speedometer went to 91 mph.

Slow94Formula

iTrader: (18)

The way the fbody.org calculator reads it it would make sense that I have 3.73's, but I have put the car on jackstands and marked the tire. Then I had a friend turn the tire around slowly (so I could count) for 1 revolution. The drive shaft turned just less than 3 and 1/2 times.