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| Correct RPM for Automatic to shift from 1st to 2nd at Max Throttle (Page 1/2) |
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pelensky
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APR 12, 11:29 AM
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I have a 1988 Fiero GT Auto. What rpm should the transmission shift at from 1st to 2nd when floored?
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sjmaye
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MAY 01, 06:06 AM
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| quote | Originally posted by pelensky:
I have a 1988 Fiero GT Auto. What rpm should the transmission shift at from 1st to 2nd when floored? |
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I have the exact same question. Weird you have not gotten a response. When I refreshed my 88 twelve years ago. I bought a rebuilt transmission from someone here on PFF. It has performed well with the the one exception- The transmission shift points seem to be at quite low rpms. I tried working on it after it was first installed, but could not find anything wrong. It just shifts too soon. While driving it yesterday I was accelerating at full throttle from stop. I happened to look at the tach when it shifted. Maybe 3,000 rpm. So, so far away from redline. [sigh]
On the bright side I have no concern of over-revving. 
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fierosound
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MAY 01, 11:37 AM
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Patrick
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MAY 01, 02:23 PM
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| quote | Originally posted by fierosound:
Depressing the D shaped button can be hard at times.
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For sure. I had one heck of a time adjusting the TV cable on my '86 GT for that very reason. It was worth the battle though as the adjustment was previously way off.
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sjmaye
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MAY 01, 04:17 PM
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The one time I tried to adjust the TV cable I also had a time with the button. That said, I think I will try again. I don't want to run my old engine near redline, but it sure seems it should get closer than 3,000 rpm before shifting at full throttle.
One thing-
Fierobsessed- "To adjust the TV cable, you open the throttle all the way, then press the button on the cable adjuster and pull the cable away from the throttle body all the way till it stops. Make sure the throttle is all the way open when doing this. Then release the button."
Ogre cave- "It takes considerable effort to make the TV cable adjuster move. Do Not press the accelerator pedal to make the adjustment or you'll likely damage the throttle cable or other parts in the system, especially in Fiero with it's snake of a cable.."
Not having looked at this thing in over a decade I cannot remember, but I assume the difference between the two statements is Ogre is referening the accelerator pedal whereas Fierobsessed references having the throttle all the way open. I assume those statements fo not conflict. I just need to hold the throttle open when attempting TV cable adjustment.
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pelensky
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MAY 01, 09:03 PM
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I have adjusted the tv cable properly and it is tight at wide open throttle. I was just curious what people see.
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sjmaye
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MAY 02, 05:50 AM
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| quote | Originally posted by pelensky:
I have a 1988 Fiero GT Auto. What rpm should the transmission shift at from 1st to 2nd when floored? |
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This is question I would like an answer to. Of course, it is a ballpark figure. I just want to know if it is reasonable for mine to shift at 3,000 rpm at full throttle.
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creaky78
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MAY 02, 02:37 PM
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When I got my '87 GT running, the auto trans would not shift out of 1st at all. Discovered quickly that the TV cable was the wrong one as the end was hanging out of the throttle wheel about three inches, proper adjustment was impossible. I shortened the cable and installed a barrel clamp and after much finagling, got the trans to shift properly. I was amazed on how much difference in shifting resulted in very small increments of adjustment.
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creaky78
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MAY 02, 07:12 PM
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In answer to the original question, I drove the GT today, full throttle shift from 1st occurs @ 5500-5800 RPM.
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sjmaye
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MAY 03, 05:17 AM
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| quote | Originally posted by creaky78:
In answer to the original question, I drove the GT today, full throttle shift from 1st occurs @ 5500-5800 RPM. |
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Thank you, Thank you! I realize it is a ballpark, but it says my 3,000 rpm shift point is way too low. I will try adjusting the TV cable again.
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