3.73 auto guys inside...
3.73 auto guys inside... Hi all,
I was wondering what MPH you guys are at when shifting into OD at WOT. Mine shifts at 110mph with my 26" tires and 114mph with the 28" tires. It is shifting at 5800 RPMs. It seems kind of low, and I don't want to run my 150 shot because of this (I am trapping 113 on the 100 shot). So if you can please let me know when yours is shifting into OD . Thanks!
PS - I understand that LS1s have different shift points. Like I said, my LT1 shifts at 5800, so if you could tell me where it's at at 5800 instead, that would help me better.
I was wondering what MPH you guys are at when shifting into OD at WOT. Mine shifts at 110mph with my 26" tires and 114mph with the 28" tires. It is shifting at 5800 RPMs. It seems kind of low, and I don't want to run my 150 shot because of this (I am trapping 113 on the 100 shot). So if you can please let me know when yours is shifting into OD . Thanks!
PS - I understand that LS1s have different shift points. Like I said, my LT1 shifts at 5800, so if you could tell me where it's at at 5800 instead, that would help me better.
hmmm i think mine finally shifts into OD at about 115 or around that, and my shift points have been raised 200 rpms every shift ext. Hardly ever do it so not 100% sure
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TECH Enthusiast
Joined: May 2004
Posts: 735
Likes: 1
From: St. Louis, MO
110?? my car with 4.10s will hold out 3rd til that. im going to 3.73s soon bc im hitting OD in the quarter. It should be higher than that.
im on 255/5/16 bfg drag radials, and stock stall.
im on 255/5/16 bfg drag radials, and stock stall.
11 Second Club
Joined: Feb 2004
Posts: 936
Likes: 0
From: Fort Greely, Alaska
humm lets see i trap close to 115 on a 26x10.5x16 tire and i still have plenty of room to go. easily near or past 120. i put my car in drive or 3, so it locks out 4th and wont go into OD at WOT. my shift points are 6200 rev limiter at 6500. its all on how its tuned i suppose. worse comes to worse just run the taller tire 
Guys,
Keep in mind, a 3200 stall in an LT1 is pretty decent sized, especially considering I just have bolt-ons.
Also, I'm shifting at 5800 (another thing to keep in mind).
Keep in mind, a 3200 stall in an LT1 is pretty decent sized, especially considering I just have bolt-ons.
Also, I'm shifting at 5800 (another thing to keep in mind).
Originally Posted by Humvee z28
humm lets see i trap close to 115 on a 26x10.5x16 tire and i still have plenty of room to go. easily near or past 120. i put my car in drive or 3, so it locks out 4th and wont go into OD at WOT. my shift points are 6200 rev limiter at 6500. its all on how its tuned i suppose. worse comes to worse just run the taller tire
I am trying to figure out how much slip is normal for a hi-stall converter. I compute yours slip at 114MPH w/ a 28" tire @ 5800 RPM's as 13.67% slip. But what doesn't make sense to me is that with a 26" tire, same situation but at 110 mph your converter slip is 9.38%.
Maybe it would be more beneficial to you to find out how much your converter should be slipping to know if yours is shifting at the right MPH. Or you could contact Frank, at CPT and see if your tranny/converter will hold up to locking your converter on the big end to make sure you don't run out of gear, if so that may be your only option besides a larger tire, or higher shift points.
Maybe it would be more beneficial to you to find out how much your converter should be slipping to know if yours is shifting at the right MPH. Or you could contact Frank, at CPT and see if your tranny/converter will hold up to locking your converter on the big end to make sure you don't run out of gear, if so that may be your only option besides a larger tire, or higher shift points.
11 Second Club
Joined: Feb 2004
Posts: 936
Likes: 0
From: Fort Greely, Alaska
Originally Posted by MattZ28
I'm running 28" tires. What RPM are you at @ 115mph?
Originally Posted by BigKap94z
I am trying to figure out how much slip is normal for a hi-stall converter. I compute yours slip at 114MPH w/ a 28" tire @ 5800 RPM's as 13.67% slip. But what doesn't make sense to me is that with a 26" tire, same situation but at 110 mph your converter slip is 9.38%.
Maybe it would be more beneficial to you to find out how much your converter should be slipping to know if yours is shifting at the right MPH. Or you could contact Frank, at CPT and see if your tranny/converter will hold up to locking your converter on the big end to make sure you don't run out of gear, if so that may be your only option besides a larger tire, or higher shift points.
Maybe it would be more beneficial to you to find out how much your converter should be slipping to know if yours is shifting at the right MPH. Or you could contact Frank, at CPT and see if your tranny/converter will hold up to locking your converter on the big end to make sure you don't run out of gear, if so that may be your only option besides a larger tire, or higher shift points.
the 26" tire is "easy" on it. thats why it doesnt have as much slip. it affectivly has more gear with the smaller tire.