Automatic Shift Points
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Cruising
Joined: Oct 2004
Posts: 14
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Automatic Shift Points
I HAVE A 94 LT1 AUTOMATIC. K&N AIR FILTER AND BORLA EXHAUST. HOW DOES THE SHIFT POINTS GET ADJUSTED?SEEMS ITS REAL EASY TO HIT THE REV LIMITER PRIOR TO THE CAR SHIFTING.
Last edited by dbone; Sep 10, 2007 at 08:38 PM.
Le Mans Master
Joined: May 2005
Posts: 5,214
Likes: 65
From: Queensland, AUSTRALIA
Here is the table for it:
Dbone, unless the shiftpoints have been changed, the rear end ratio has been changed, or the transmission is slipping on the shifts, it shouldnt hit the rev limiter unless youre holding it in a particular gear. If you get Tunercat and an ALDL cable, i can change the shift points for you.
If the rear end ratio goes up numerically, it will shift gears at a higher RPM because the PCM commands shifts on the basis of TPS% vs MPH (see table above).
Le Mans Master
Joined: Jul 2004
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From: In front of C6s.
St: Jude Donor '10
I recently had my tranny rebuilt and had them tighten up the shift points via a tune (reprogramming the computer). Shifts like a champ now
Instructor
Joined: May 2007
Posts: 209
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From: greensboro nc
I have the same set up with 315 gears, i have the hypertech tuner, so i can change shift points at any time.
Racer
Joined: Nov 2006
Posts: 322
Likes: 1
From: Muskego Wisconsin
This is a good topic.
I hit rev lmtr frequently, and figured the trani may be the culprit.
I too have a 94 with no mods but exhaust and filters.
Only hit limiter when I tromp her down and the trani down shifts into scream away gear. Then I bounce of the limiter.
I hit rev lmtr frequently, and figured the trani may be the culprit.
I too have a 94 with no mods but exhaust and filters.
Only hit limiter when I tromp her down and the trani down shifts into scream away gear. Then I bounce of the limiter.
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Le Mans Master
Joined: Jul 2004
Posts: 9,835
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From: In front of C6s.
St: Jude Donor '10
100%. I still think this is the sign of a slipping transmission or other problem.When my tranny started failing at 92ishK miles, it would rev out pretty high before it would shift, i.e., it was slow to shift into the next gear. Even if you floor it/drive your car hard (I know I do), a healthy transmission and/or computer will shift before it hits the rev limiter.
Now with a very well rebuilt tranny, bigger stall, and a very tight tune on the tranny (I asked for the most neck-snapping shifts possible), my car shifts quick and hard, it never bounces off the rev limiter.
Le Mans Master
Joined: May 2005
Posts: 5,214
Likes: 65
From: Queensland, AUSTRALIA
100%. I still think this is the sign of a slipping transmission or other problem.When my tranny started failing at 92ishK miles, it would rev out pretty high before it would shift, i.e., it was slow to shift into the next gear. Even if you floor it/drive your car hard (I know I do), a healthy transmission and/or computer will shift before it hits the rev limiter.
Now with a very well rebuilt tranny, bigger stall, and a very tight tune on the tranny (I asked for the most neck-snapping shifts possible), my car shifts quick and hard, it never bounces off the rev limiter.
Very much so.
Racer
Joined: Nov 2006
Posts: 322
Likes: 1
From: Muskego Wisconsin
slippage into the next gear? doesn't seem as though it's shifting out of the previous gear befor it hit rev. lmtr. Kind of like it's locking out or maybe not developing the proper pressure to move valves or what have you, to force the next gear. could dirty filter and oil be the cause. Dip stick oil looks red-not burnt. but filter?? who knows.
Le Mans Master
Joined: May 2005
Posts: 5,214
Likes: 65
From: Queensland, AUSTRALIA
I spose if the pressure is down it might cause it, i really dont know, but id guess it would still do the same as i decribed if its lacking pressure, cause when it attemps to engage the next gear and the clutch pack starts slipping (be it lack of pressure or just lack of clutch material, slipping is slipping), it may seem as though its still in the same gear until the rev limiter cuts in and power drops off which gives the clutch pack a chance to grab.
My 94 did it and the fluid was still red, didnt smell burned either, but when i had it serviced and we broke the filter open, it was full of clutches.
Not sure how well youll see it, but here is the opened filter, you might be able to see the clutch material in there...
My 94 did it and the fluid was still red, didnt smell burned either, but when i had it serviced and we broke the filter open, it was full of clutches.
Not sure how well youll see it, but here is the opened filter, you might be able to see the clutch material in there...
Last edited by Casethecorvetteman; Sep 15, 2007 at 11:29 AM.
Racer
Joined: Nov 2006
Posts: 322
Likes: 1
From: Muskego Wisconsin
Yes, lower RPM's and grabs. makes perfect sence. From what I can tell from the pic. it looked...well, bad. Two quickies for ya,
1.) Did it solve your issues? (Rev~slippage)
B.) Did you dump all oil and replace filter or just pan oil and filter?
1.) Did it solve your issues? (Rev~slippage)
B.) Did you dump all oil and replace filter or just pan oil and filter?
Last edited by ineVETTEable; Sep 16, 2007 at 12:19 PM.
Le Mans Master
Joined: May 2005
Posts: 5,214
Likes: 65
From: Queensland, AUSTRALIA
1: Not much at all, the damage was done and the clutch packs had next to nothing left on them.
2: Servicing a transmission means replacing the fluid, the filter and the pan gasket.
I rebuilt it a week later cause it was under warrantee.
2: Servicing a transmission means replacing the fluid, the filter and the pan gasket.
I rebuilt it a week later cause it was under warrantee.