4l60E W/ Rachet shifter want it to hold geart till i change and still keep D function

[HellKnightHicks]

Im putting a hurst Rachet shifter on my Racing built 4l60e

I would like to tune the computer to hold the gear im in and not force an upshift.

Ive looked that the tables but am generally unclear as to how to accomplish this.

So im assuming that i just max out all of the following tables to 8192

{D0940} WOT 1->2 Shift RPM, Normal
{D0941} WOT 1->2 Shift RPM, Performance
{D0942} WOT 1->2 Shift RPM, Hot
{D0969} WOT 1->2 Shift RPM, 4WD Low
{D0945} WOT 2->3 Shift RPM, Normal
{D0946} WOT 2->3 Shift RPM, Performance
{D0947} WOT 2->3 Shift RPM, Hot
{D0970} WOT 2->3 Shift RPM, 4WD Low
{D0950} WOT 3->4 Shift RPM, Normal
{D0951} WOT 3->4 Shift RPM, Performance
{D0952} WOT 3->4 Shift RPM, Hot
{D0971} WOT 3->4 Shift RPM, 4WD Low

That should take care of the at WOT scenario

How ever i would also like the option to just put it in drive..... and let the ECM handle it..... that may effect that. What do you guys think?

[joecar]

No, do not max them out, if you do then it won't upshift at WOT (even when you move the lever).

You can set it up to hold Manual 1st and Manual 2nd (should already be like that in stock form), but in Manual 3rd it will auto shift 1-2-3.

What year/vehicle...?

Post your tune file.

[johnv]

I would look at D0913, D0918, D0919, D0914.

[Taz]

If you set all the WOT upshift RPM parameters to 8192 RPM - the transmission won’t upshift at WOT until 8192 RPM is reached - despite input from the gear selector. Vehicle speed and RPM parameters must both be met for a WOT upshift to occur.

A 4L60 transmission should not upshift beyond the gear selected (after configuring D0913, D0914, D0918, D0919) - but it will downshift below the gear selected, if the conditions for the downshift are met.

Manual downshift maximum speed parameters may be adjusted via D0928 and D0933.

If you want to fully control the upshift and downshift via the gear selector - and have it hold that particular gear indefinitely - the only option I can think of, is a full manual shift kit - but that would eliminate all automatic functionality.


Regards,
Taz

[HellKnightHicks]

If you set all the WOT upshift RPM parameters to 8192 RPM - the transmission won’t upshift at WOT until 8192 RPM is reached - despite input from the gear selector. Vehicle speed and RPM parameters must both be met for a WOT upshift to occur.

A 4L60 transmission should not upshift beyond the gear selected (after configuring D0913, D0914, D0918, D0919) - but it will downshift below the gear selected, if the conditions for the downshift are met.

Manual downshift maximum speed parameters may be adjusted via D0928 and D0933.

If you want to fully control the upshift and downshift via the gear selector - and have it hold that particular gear indefinitely - the only option I can think of, is a full manual shift kit - but that would eliminate all automatic functionality.


Regards,
Taz


So you do not think that i can acheve this by modifying the tables listed above?

[HellKnightHicks]

even if i could make it so that it would hold gears and get rid of the automatic shift up or down id be ok with that.

The transmission company i purchased it from offers a computer that plugs direcly into the tranny to allow you to shift full manual... i had assumed that i could do the same with the computer.

[slow67]

Well with the majority of the cars ive tuned, they will already manually hold 1st and 2nd no matter what (with very few exceptions). It also won't go into 4th unless the shifter is in 4th. So set all your upshifts to 0 mph and your downshifts to 256mph.

[Taz]

Good point … I had over looked that option … those tuning changes would have a similar effect as a full manual shift kit.

Although, this would effectively disable all “automatic” shift functions ….


Regards,
Taz

[joecar]

Yes, slow67's suggestion will make the PCM hold each gear (you won't have any automatic shifts);

However I think you will be more consistent and have better ET/TS if you allow automatic shifts...

you will have to adjust the shift points (shift as high as your engine can tolerate; upgrade your valvetrain if necessary).

[zrx1200]

perhaps a 4l60 would be better?.when manually shifting my car always seems to have a sleep before it shifts.
i do what joecar recomends and program the shifts to suit you seem to need to allow 500 od rpm for the std box to change at wot

[HellKnightHicks]

I have an upgraded valvetrain im building a 383 stroker with custom cam from comp 575 lift 230 duration.

I just wanted to be in control of the tranny....

Ill run it as an auto for a while then switch over..

Thanks for the ideas.. Im gonna read arround on tranny tuning and work on makeing the upper gears shift stiff as well...

Thanks guys

[barbermi]

Good point … I had over looked that option … those tuning changes would have a similar effect as a full manual shift kit.

Although, this would effectively disable all “automatic” shift functions ….


Regards,
Taz



I have just stumbled across this thread.

If I set D0913 to 0km/h will this mean that the PCM will not command an upshift 1>2 when holding D1 unless I upshift to D2?
I have noted in my tune D0919 is set to 0km/h and my PCM does not force an upshift 2>3 unless I make it shift going to D3 on the stick.

Cheers.

[joecar]

I have just stumbled across this thread.

If I set D0913 to 0km/h will this mean that the PCM will not command an upshift 1>2 when holding D1 unless I upshift to D2?
I have noted in my tune D0919 is set to 0km/h and my PCM does not force an upshift 2>3 unless I make it shift going to D3 on the stick.

Cheers.
D0913, D0914, D0919, D0919: set these to max (255 mph).
D0929: set this to zero.

[joecar]

Note:
- upshift MPH: upshift enables when MPH goes above this value and downshift MPH is not met (MPH is above downshift MPH).
- downshift MPH: downshift enables when MPH goes below this value and upshift MPH is not met (MPH is below upshift MPH).

They are circular, so whichever one (upshift or downshift) has precedence varies by OS (i.e. you have to set them up intentionally to do what you require, do not rely on one having precedence over the other).


Corollary:
- the downshift MPH parameter/table may inhibit the upshift if not set correctly,
- the upshift MPH parameter/table may inhibit the downshift if not set correctly.


Also: set the Throttle Kickdown tables D0960-2 to all 100%.