Worried about top end on th350.
Thread Starter
Joined: Jul 2005
Posts: 1,630
Likes: 116
From: Ft Lupton, CO
Worried about top end on th350. I recently completed my 350 swap from an m6 car. So Im sitting on stock wheels with 3.43 gears with a 4k stall. On the highway Im at about 55mph at 3k in 3rd. I really dont think my car will make it through the traps without bouncing off the limiter. Is there a way to tell what mph I will be at by about 6k rpm? Im still on a stock tune with all of this. Does anyone know of a way to find out speed vs rpm with out trans gear ratios and just a rear ratio? I love the way it gets up to speed now 
but Im really afraid Im going to need bigger tires.
but Im really afraid Im going to need bigger tires. http://www.richmondgear.com/streetcalculators.html
Well basically you need all the variables you mentioned to calculate the thing but it's so easy to play with. I've come up with 136 mph at 6011 RPM on a 26" tire and 3.42 gear. You're not going to run out of gear.
Well basically you need all the variables you mentioned to calculate the thing but it's so easy to play with. I've come up with 136 mph at 6011 RPM on a 26" tire and 3.42 gear. You're not going to run out of gear.
Last edited by dhdenney; Nov 13, 2006 at 10:02 AM.
Thread Starter
Joined: Jul 2005
Posts: 1,630
Likes: 116
From: Ft Lupton, CO
Ok...now when I type in my known rpm (3k) and known speed (55) and known tire size (26) it says I have a 4.22 gear. Im going to say that the speed may be a little off as I paced my g/f at 3k rpms and I was at about 55. So giving that it may be off I would guess a 4.10 gear? Or would a 4k torque converter just throw this equation out the window seeing as I was sitting a 3k?
Im so confused.
Im so confused.
A3 is not locked on the highway, you need to figure
your "ideal" highway RPM backward from rubber and
gears and compare that to cruise RPM observed. If
you see much slip then forget what you might get
from (6000RPM/cruiseRPM) x MPH - the slip is going
to (mostly) go away at the top end. But at 3000RPM
cruise on a 3000RPM stall speed converter, you're
still paddlewheeling some.
Hope your trans cooler is a big'un.
your "ideal" highway RPM backward from rubber and
gears and compare that to cruise RPM observed. If
you see much slip then forget what you might get
from (6000RPM/cruiseRPM) x MPH - the slip is going
to (mostly) go away at the top end. But at 3000RPM
cruise on a 3000RPM stall speed converter, you're
still paddlewheeling some.
Hope your trans cooler is a big'un.
Originally Posted by ss1129
Ok...now when I type in my known rpm (3k) and known speed (55) and known tire size (26) it says I have a 4.22 gear. Im going to say that the speed may be a little off as I paced my g/f at 3k rpms and I was at about 55. So giving that it may be off I would guess a 4.10 gear? Or would a 4k torque converter just throw this equation out the window seeing as I was sitting a 3k?
Im so confused.
Im so confused.
Originally Posted by jimmyblue
A3 is not locked on the highway, you need to figure
your "ideal" highway RPM backward from rubber and
gears and compare that to cruise RPM observed. If
you see much slip then forget what you might get
from (6000RPM/cruiseRPM) x MPH - the slip is going
to (mostly) go away at the top end. But at 3000RPM
cruise on a 3000RPM stall speed converter, you're
still paddlewheeling some.
Hope your trans cooler is a big'un.
your "ideal" highway RPM backward from rubber and
gears and compare that to cruise RPM observed. If
you see much slip then forget what you might get
from (6000RPM/cruiseRPM) x MPH - the slip is going
to (mostly) go away at the top end. But at 3000RPM
cruise on a 3000RPM stall speed converter, you're
still paddlewheeling some.
Hope your trans cooler is a big'un.
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No, The convertor will be trying to fluid lock at the top end.
Best way to find out is to run it. Your N/A so the worst thing that will happen is you smack the revlimiter (big deal, I did it a 1000 times as an M6 driver)
Best way to find out is to run it. Your N/A so the worst thing that will happen is you smack the revlimiter (big deal, I did it a 1000 times as an M6 driver)
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Originally Posted by chpmnsws6
No, The convertor will be trying to fluid lock at the top end.
Best way to find out is to run it. Your N/A so the worst thing that will happen is you smack the revlimiter (big deal, I did it a 1000 times as an M6 driver)
Best way to find out is to run it. Your N/A so the worst thing that will happen is you smack the revlimiter (big deal, I did it a 1000 times as an M6 driver)
Thats pretty hard to do with no master cylender, clutch, or flywheel. This probably makes no sesnse to most of you, but some people get what I am trying to say
Thread Starter
Joined: Jul 2005
Posts: 1,630
Likes: 116
From: Ft Lupton, CO
Got it to the track last week. Went 12.57@ 113 through the traps at 6k. Im not too dissapointed with the time seeing as my differential is about useless now. I was like Joe Dirt out there with right tire fire. Cutting worse 60's than with my t56 at 2.01 being the better of the 2.
