Jakes Performance 4L80E Recalibration Kit - QUESTION
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Joined: Mar 2007
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From: Saskatchewan, Canada - where arguing "DA" is for the slow and weak...
Jakes Performance 4L80E Recalibration Kit - QUESTION I just ordered this up today for the planned trans upgrade for our nitrous LS1 wagon (60E to 80E). Based upon my research this recal kit addresses many of the issues highlighted by many top builders.
Per the instructions (http://www.jakesperformance.com/wp-c...s-12222016.pdf) there is only one consideration that concerns me:
I had hoped to use the car in a few autocross events this year. Now, I am certain that the fact the car has 28" tall tires and 3.73s it is unlikely the car will need to get out of 1st gear, or will stay in 2nd (we do have high speed straights up here).
If I were to program the ECM to hold gears longer (more like a manual valve body) would this be enough to mitigate the risk of "frequent downshifting"?
I used to race my Turbo Buick with a built TH400 (w/a RMVB & transbrake) and would just launch the car, slam it into 2nd, and trail brake it to avoid jerking the sprag (at least that was the theory - http://www.yellowbullet.com/forum/sh...d.php?t=593406).
I am assuming the same strategy could be applied to the 4L80E.
Per the instructions (http://www.jakesperformance.com/wp-c...s-12222016.pdf) there is only one consideration that concerns me:
We do not recommend using this kit for off road use where frequent downshifting of the unit for engine braking is necessary.
If I were to program the ECM to hold gears longer (more like a manual valve body) would this be enough to mitigate the risk of "frequent downshifting"?
I used to race my Turbo Buick with a built TH400 (w/a RMVB & transbrake) and would just launch the car, slam it into 2nd, and trail brake it to avoid jerking the sprag (at least that was the theory - http://www.yellowbullet.com/forum/sh...d.php?t=593406).
I am assuming the same strategy could be applied to the 4L80E.
Last edited by mrvedit; Jan 13, 2018 at 12:02 PM. Reason: Add "Question" to title
Thread Starter
Joined: Mar 2007
Posts: 1,149
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From: Saskatchewan, Canada - where arguing "DA" is for the slow and weak...
Damn right it is a question! 
Doing research as time allows:
5 years have passed since this was last updated
https://www.hptuners.com/forum/showt...nual-low-4L80e
Doing research as time allows:
5 years have passed since this was last updated
https://www.hptuners.com/forum/showt...nual-low-4L80e
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Joined: Jan 2015
Posts: 1,114
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From: Fort Worth, Texas
Damn right it is a question!
Doing research as time allows:
5 years have passed since this was last updated
https://www.hptuners.com/forum/showt...nual-low-4L80e
Doing research as time allows:
5 years have passed since this was last updated
https://www.hptuners.com/forum/showt...nual-low-4L80e
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Joined: Jan 2015
Posts: 1,114
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From: Fort Worth, Texas
I didn't design Jake's shift kit so this would be a guess........
When blocking the 1-2 Accumulator oil feed to the 1-2 Accumulator piston......Shifting into D1 at speed will cause the Lo/Reverse Band to apply but without "Line" pressure under the accumulator piston to cushion the apply, The Band Apply will be very rough/harsh.
When blocking the 1-2 Accumulator oil feed to the 1-2 Accumulator piston......Shifting into D1 at speed will cause the Lo/Reverse Band to apply but without "Line" pressure under the accumulator piston to cushion the apply, The Band Apply will be very rough/harsh.
Joined: Aug 2007
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From: Turnin' Wrenches Infractions: 005
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Joined: Jan 2015
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From: Fort Worth, Texas
My version (3.6) doesn't have a D1 tab, The D1 Urban table has worked for me. You may want to update your HPT & try maxing the 1-2 upshift speeds??
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Joined: Mar 2007
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From: Saskatchewan, Canada - where arguing "DA" is for the slow and weak...
Wonderful news, thanks! What are your rear gears and tire height (if you don't mind my asking)?
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From: Saskatchewan, Canada - where arguing "DA" is for the slow and weak...
https://www.hptuners.com/forum/showt...-Switch-Option
Similiar concept for the 60E (funny how the go to is a TransGo shift kit with the ability to forever hold the trans in 1st, which I left out of 70E):
https://www.hptuners.com/forum/showt...ifting-a-4L60e
I didn't design Jake's shift kit so this would be a guess........
When blocking the 1-2 Accumulator oil feed to the 1-2 Accumulator piston......Shifting into D1 at speed will cause the Lo/Reverse Band to apply but without "Line" pressure under the accumulator piston to cushion the apply, The Band Apply will be very rough/harsh.
When blocking the 1-2 Accumulator oil feed to the 1-2 Accumulator piston......Shifting into D1 at speed will cause the Lo/Reverse Band to apply but without "Line" pressure under the accumulator piston to cushion the apply, The Band Apply will be very rough/harsh.
As always I greatly appreciate the insight.
How would you add the performance switch? Is it a literal switch like a tow/haul button in a truck? If so, does the OS have to be changed in the ecm?
Thanks for any info!
Thanks for any info!
