TCCoA Forums banner

1 - 20 of 26 Posts

·
MN12 Fanatic
Joined
·
1,459 Posts
Discussion Starter #1
Can someone tell me what the stock shift points (I think like 4900 for the 1-2 and like 5100 for the 2-3, at least thats how my buddies 94 shifts) are and what they are when you get a apten chip? I beleive my shift points with the chip are 5600rpms, but wanna make sure. And my rev limiters are at 6000, is that right? Seems kinda dangerous so thats why I am asking, but my tach may just be off a little. And what rpm is the "balooning" supposed to occur?

Thanks!
 

·
Registered
Joined
·
1,391 Posts
4350 1-2???? mine shifts at like 4800 on the 1-2 like teh 2-3 and 3-4.
 

·
Sheepish
Joined
·
4,085 Posts
97Tibirdman said:
4350 1-2???? mine shifts at like 4800 on the 1-2 like teh 2-3 and 3-4.
It takes time for the clutches to fill. The EEC has to command the gear shift long enough ahead to allow the clutches to fill and actually start bringing the rpms down and engaging the next gear. In a stock car's case that shifts around 4900, it take that 500-600 rpms to fill the clutches.

Check out the tech articles, Ford OD Transmissions 101
 

·
Registered
Joined
·
1,391 Posts
I guess I never thought of that. Thanks for the info, I learn something new everyday here!:cool:
 

·
Registered
Joined
·
3,178 Posts
Yes, but I think it's up around 6500 or so if I recall right... but your stock rods wont go that high so it's not a worry :)
 

·
Sheepish
Joined
·
4,085 Posts
Silver95Bird said:
Yes, but I think it's up around 6500 or so if I recall right... but your stock rods wont go that high so it's not a worry :)
Agreed, especially considering the stock engine won't any real power that high anyways.
 

·
MaleWhore
Joined
·
2,640 Posts
as i have heard, they put the top speed limiter for some reasons, and one was the TC...now if u upgrade to a mark viii, is the speed raised?(assuming with appropriate DS)if so, how much? what about the marauder TC?
 

·
Sheepish
Joined
·
4,085 Posts
The TC's safety concern isn't in regards to vehicle speed, just engine rpm. The TC begins to balloon around 5400rpms, and if allowed to do so, could stretch to the point that the bearings can fall out of their races and trash the converter, taking the transmission with it. The Mark VIII and Marauder units don't balloon until the 6500rpm range.

The driveshaft is one concern that the speed limiter is set so low, but its not nearly the deathtrap that people think it is.

The biggest reason that the speed limiter is set so low is because the factory tires are only speed rated to 112mph.
 

·
Banned
Joined
·
2,009 Posts
AverageJoe said:
The TC's safety concern isn't in regards to vehicle speed, just engine rpm. The TC begins to balloon around 5400rpms, and if allowed to do so, could stretch to the point that the bearings can fall out of their races and trash the converter, taking the transmission with it. The Mark VIII and Marauder units don't balloon until the 6500rpm range.

Here I go again up on top of my soap box! :eek:

That 5400 RPMS is assuming a relatively new torque converter. As the torque converter ages, stresses build up in the material that could weaken the metal and cause ballooning a little earlier. This is what I call aging…

The limited service life is part of every mechanical design. This is the reason you see 20 year old air planes going into retirement or restoration. If they did not they would crash. Trust me when I say the design service life of automobiles is not as long as airplanes. They want you to buy new car!

In addition, as your transmission gets older the pump just does not pump like it used to. It takes longer to ramp up the torque converter and this can be a problem since you get near the ballooning point.

I like to keep my transmission as long as I can so that I can throw my money at other things. Even though I have a well made Pro Torque torque converter and a Art-Carr transmission I make sure that my transmission shifts below 4800 RPM's under WOT conditions. :tongue:
 

·
Registered
Joined
·
1,391 Posts
So what are the shift points with an apten, J-chip, ect.....
 

·
Formerly Fdawg97LX
Joined
·
3,186 Posts
97Tibirdman said:
So what are the shift points with an apten, J-chip, ect.....
with an apten chip my car shifts at about 5500 rpms for the 1-2 and about 5600-5700 for the 2-3.

Frank
 

·
Registered
Joined
·
1,391 Posts
If I get an apten chip will it baloon my TC? I thought they worked fine with a stock driveline
:2huh:
 

·
MN12 Fanatic
Joined
·
1,459 Posts
Discussion Starter #16
fdawg97lx said:


with an apten chip my car shifts at about 5500 rpms for the 1-2 and about 5600-5700 for the 2-3.

Frank
Yea that's about were mine shifts or at least that is how high the rpms get while shifting. I know there is a slight delay so I would guess the tranny is told to shift at about 5400.

This is why I asked this question. I was pretty sure the balooning was 5400 and I know my shifts are above that. But know one with chips seemed top have any issues. Why is that? Has anyone even blew up there stock TC before?

One time I was stuck in/on some ice behind my house. I had a few friends pushing me while I had it in reverse. I was giving it some gas and I was turned around looking behind me (being thart I am trying to go in reverse) and when I turn around I see that I am at 6000 RPMS. So thats why I actually made this thread. With a chip is there a rev limiter?

:leftright :eek:
 

·
MN12 Fanatic
Joined
·
1,459 Posts
Discussion Starter #17
J.Miller said:

I like to keep my transmission as long as I can so that I can throw my money at other things. Even though I have a well made Pro Torque torque converter and a Art-Carr transmission I make sure that my transmission shifts below 4800 RPM's under WOT conditions. :tongue:
Or is that because you have a 5.4 and there is no need to go that high??

;) :tongue:
 

·
Moderator, Iowa Chapter Director, Uber Luber, TCCo
Joined
·
8,978 Posts
Tony said:
With a chip is there a rev limiter?

:leftright :eek:
nope, but if you ask I'm sure they'd let you keep it. I'd sure want to keep it, or at least set it a bit higher than stock.

Yesterday I was leaving a snowy parking lot in a not-so-great mood and stomped on it, look down and the tach says 5500. Now that's a lot for my 3.8 that shifts at 4300. Kinda scared me for a sec.

-Thomas
 

·
Registered
Joined
·
871 Posts
My tach was broken when i got it, so i don't have to worry about it. :D
 

·
Refrigerator Raider Hater
Joined
·
11,719 Posts
completely removing the rev limiter is stupid. there is no reason to, your engine stops making power at a certain point, and it leaves it open to a grenade mishap.

None of the SCT family completely removes the limiter. If I was a tuner I would refuse to do it
 
1 - 20 of 26 Posts
Top