Changing auto Shift points

MaxedGT

Member

Mar 31, 2005

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17

Surrey BC Canada

Mar 19, 2006

#1

• Mar 19, 2006

• #1

My 01 Gt 4r70w shifts too early for my liking. I've done the J-mod. Love the results! And I've programmed the shifts as late as possible using my Superchips 1745 programmer. But it still shifts really early on light throttle. I'm in 4th lockup by the time I just get through and intersection. Thats about 30 mph. I know there's nothing wrong with it, it just doesn't suit my taste. I've got 3.73 gears and I was thinking about programming it as 3.90 gears or 4.10's as a way to change the shift points. Would this cause durability problems or late shifts at wide open throttle?

 

K

Kilgore Trout

Fried or Broiled ?

10 Year Member

Mar 30, 2005

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Mar 19, 2006

#2

• Mar 19, 2006

• #2

Do you have a tranny cooler?

 

MaxedGT

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Mar 31, 2005

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Surrey BC Canada

Mar 19, 2006

#3

• Mar 19, 2006

• #3

Not yet but it's coming very very soon. I know.
I guess one solution would be a 3200 rpm torque converter
That's my next planned mod.

 

loosescrew79

New Member

Dec 18, 2004

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Mar 19, 2006

#4

• Mar 19, 2006

• #4

a 3200 torgue convert. might help.

If it only shifts early on moderate throttle, I recommend drive it WOT all the time. hahaha

 

propellerhead

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Apr 13, 2004

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"but what's with the but shots?"

Mar 20, 2006

#5

• Mar 20, 2006

• #5

A stall converter will not change your shift points. Get an SCT Xcalibrator2. That will let you change your part throttle shift points. Or, get a custom tune and ask the tuner to raise the part throttle shift points.

 

Mike97gt

it doe snot

Founding Member

Jan 26, 1999

10,633

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the people's republic of massachusetts

Mar 20, 2006

#6

• Mar 20, 2006

• #6

propellerhead said:

A stall converter will not change your shift points. Get an SCT Xcalibrator2. That will let you change your part throttle shift points. Or, get a custom tune and ask the tuner to raise the part throttle shift points.

Click to expand...

+1 and get a damm trans cooler.

 

SamMan

New Member

Aug 20, 2005

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Denton, TX

Mar 20, 2006

#7

• Mar 20, 2006

• #7

Doesnt the Predator change partial throttle also?

I got one used and I am pretty pleased with it so far.

Sorry to hijack but whats up with the tranny cooler? I have asked about 3 trasmission shops and they all said you dont really need one unless youre towing.

 

propellerhead

New Member

Apr 13, 2004

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"but what's with the but shots?"

Mar 20, 2006

#8

• Mar 20, 2006

• #8

SamMan said:

Doesnt the Predator change partial throttle also?

I got one used and I am pretty pleased with it so far.

Sorry to hijack but whats up with the tranny cooler? I have asked about 3 trasmission shops and they all said you dont really need one unless youre towing.

Click to expand...

No. The Predator will only let you change WOT shift points. Although, you can get a Diablosport tuner to make you a tune with modified part throttle shift points, then email it to you, then you can load it into your car using the Predator.

I've talked to some high powered race car builders. They've had 250+ degree temps in their tranny without issues but they normally service the transmission after a few trips to the track. My car is a daily driver so it's cheap insurance to keep the temps below 200. I need longevity out of it.

 

joshheat25

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Nov 8, 2004

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Delaware

Mar 20, 2006

#9

• Mar 20, 2006

• #9

I have 4.10's and mine gets into 4th at about 30 as well! You can manually shift it if that will appease you other than that I don't think there is a way unless you get a program to change it Electronically! You have to manipulate the ECU with a program. I hear the diablo chip allows you to change part throttle shift points!

 

MaxedGT

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Mar 31, 2005

304

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Surrey BC Canada

Mar 21, 2006

#10

• Mar 21, 2006

• #10

After more thought I figure I was on the wrong track because the shift points would be related to prop speed, not speedo reading. So a different programmer would be my only option. The Xcal2 appeals to me because of the data logging and PC software that would give me a lot more info and flexabilty. Manually shifting on a regular basis, I feel, would be a little hard on the tranny due to higher pressures used during manual shifts. Might be a little abusive.
Thanks for all the input.:SNSign: