gear selection

He is talking about the traps(end of 1/4 mile)....SO, no, they don't matter...Anyways, we aren't helping any...I will let more intelligent people post in this thread because I am unsure about what I am talking about. SRY
 
77 ford said:
so first and 2nd dont matter ?
so if my first takes me to lets say 80 ft and yours takes you to 65 ft it wont make a difference on where we shift into 2nd,3rd ? :undecided
Click to expand...

no, as long as you are the the top of your powerband through the traps, you can adjust your shift points as neccesary
 
That was the point of my post. Im sure 4800 is not at the end of my powerband. I wanted to come thru around 6-6200 at 108.
 
SloNotch said:
That was the point of my post. Im sure 4800 is not at the end of my powerband. I wanted to come thru around 6-6200 at 108.
Click to expand...

ok, ~6000 rpm
26" tires
108 mph


4.30:1 will put you right at 6000 RPM
4.56:1 will be just under 6400 RPM



and since you are a stick, you don't need to count in converter slippage, so, as long as you have to power to push it to 108 MPH in a 1/4, you are good to go with 4.30's
 
If you have the suspension dialed in you can go to 4.56. You are better off using the available torque when the car is not moving fast and going over the powerband a little up top if you want the absolute best et's. Just remember that the increase in gear % wise is going to directly increase the torque at the axle that much. If you put in gears and your 60' goes down then you are going in the right direction. If you 60' stays the same or gets worse you need to look at you suspension and launch rpm. Tire height increases are always good also. You can throw even more gear at it then.
 
SloNotch said:
I don't feel like doing basic algebra so i posted. What kind of answer is that?
Click to expand...
sorry, i thought it was easy.
4800 times 4.10 divided by 3.73= 5276
4800 times 4.30 divided by 3.73=5533

whats more important is what mile per hour you want your vehicle to go at what ever rpm that you choose. this take home work.
1st and second gear ratios make no difference on mph. it makes no difference whether you take off in second or third, your vehicle will mph the same (just a lot slower et).

mph=hp

tire height times pie divided by 12 = x
5280 times x = y
gear raito times y = rpm @ 60 mph
this gives you base line.
from there you can figure your mph @ what ever rpm.
automatic cars with a proper torqueconverter will loose 4-6% (mph times 95% is close enough)
hope that helps. if you need more help pm me.
 
Why'd you have to say that now?
I had already made up my mind to go with a 4.30.
If the 4.30 is too much I can always go to a 28" tire.
 
my buddy has 4.30 is his 88 lx t-5z trans stock 225/55/16 tires iron dart heads hogged out gt40 and a 600 lift wolverire cam about 10.5 to 1 when we went to lapeer dragway at the traps i was at 6500:undecided seemes perfect to me maybee this helps i would use this gear and 26/10 slicks if u can make power to 6500rpm we were only turning 12.56 in the quarter leaving at 1500 rpm no traction:banghead:
 
SloNotch said:
Why'd you have to say that now?
I had already made up my mind to go with a 4.30.
If the 4.30 is too much I can always go to a 28" tire.
Click to expand...


4.30 with a 26" is going to be 111.57 @ 6200 rpm and with a 28" 120.16 @ 6200. These numbers are not figuring for tire growth but you will be fine.
 
93notch76 said:
my buddy has 4.30 is his 88 lx t-5z trans stock 225/55/16 tires iron dart heads hogged out gt40 and a 600 lift wolverire cam about 10.5 to 1 when we went to lapeer dragway at the traps i was at 6500:undecided seemes perfect to me maybee this helps i would use this gear and 26/10 slicks if u can make power to 6500rpm we were only turning 12.56 in the quarter leaving at 1500 rpm no traction:banghead:
Click to expand...


thanks.
this is exactly the kind of info i was looking for.
 
You must log in or register to reply here.
Back
Top