Lowering Shift Points

[Needmoreboost]

Keep on topic Kiddies!  Shift points.  Shift points.  There are corn threads.  Or feel free to start your own.  Fomo...

[EcoPowerParts]

I'm trying to lower my shift points, my tranny is not liking trying to shift during or around the peak of the torque curve.

[Needmoreboost]

I'm trying to lower my shift points, my tranny is not liking trying to shift during or around the peak of the torque curve.

Put that Flex in the garage and try with your F150 Ecoboost.  99% of the people on here are mildly modified. 

[FoMoCoSHO]

Captain Obvious has entered the building!

[bpd1151]

Put that Flex in the garage and try with your F150 Ecoboost.

No! No, no, no.......

Don't put your Flex in the garage.

Keep working on that monster of yours! The entire community is anxiously waiting on the edge of the seats for each and every update.



Sent from my DROID3 using Tapatalk 2

[FoMoCoSHO]

Put that Flex in the garage and try with your F150 Ecoboost.

No! No, no, no.......

Don't put your Flex in the garage.

Keep working on that monster of yours! The entire community is anxiously waiting on the edge of the seats for each and every update.



Sent from my DROID3 using Tapatalk 2

THIS!

[Needmoreboost]

Captain Obvious has entered the building!

FoMoCoSHO....  Are you name calling?  That's not allowed per the rules.    LOL

[EcoBrick Bob]

I actually manually shifted my Flex down into 2nd at very low speed after W/M system was spraying Denatured Alcohol at full spray.  The Denatured alcohol if tuned for it would have been fine above 3K and at full throttle.  It just burns differently and is not as high an octane, and it's flash point is lower.

Had I been using a controller this never would have happened.  However I have  simple boost controlled on/off power switch for my pump.  I was running a #10 nozzle and at least 200PSI spray.  My system is much simpler and doesn't have to consider controller failure, which is a very real possibility.  It is almost as effective as a system with a controller when tuned correctly, which mine was on 70 + % methanol.  This all happened in late March 2012, when my Flex had around 34K.  It now is over 66K and 32K on new long block.  Runs great!  Recently I finally went from stock tune to Torrie's 93 tune, and tried a couple runs on Livernois 4+.

[FoMoCoSHO]

If you look at dynograph shifting over 5500 RPM doesn't make a ton of sense on my car due to the HUGE HP and torque drop off.
Here's my evaluation of the current vs future shift points I am going to try.
Current:
Shift Points (rpm)     
                                   TQ at shift                                  TQ at next gear
1st-2nd     6500     38     500     RPM in 2nd       4164    582     
2nd-3rd     6500     59     500     RPM in 3rd       4167     582     
3rd-4th     6500     93      500     RPM in 4th       4981     635     
4th-5th     6500     121    500     RPM in 5th       4610     635     
5th-6th     6500     170    500     RPM in 6th      4810     640     



Suggested:
Shift Points (rpm)     
                                      TQ at shift                               TQ at next gear
1st-2nd     5540     32      600      RPM in 2nd     3549     510
2nd-3rd     5539     51      600      RPM in 3rd     3551     510
3rd-4th     5146     73       624      RPM in 4th     3943     558
4th-5th     5318     99       612      RPM in 5th     3772     534
5th-6th     5224     137     618     RPM in 6th     3866     546

New shift points puts us into the torque curve as it builds and shifts just after, current shifts well after torque max and shifts into the max.

This strategy my help your tranny live a little longer too.

[rallycobra]

You need to look at hp, not torque. You want to optimize your shift points for maximum total area under the hp curve. If your power peak is at 5400, you want to shift later than that if you can rev the engine higher. A quick glance at your power curve shows you should never let your rpms drop below 4000. I would set gears 1 and 2 to shift at about 6400
gear 3,4,5 about 6300. You need to see the power curve all the way out to max rpm before calculating optimum shift points

When you tell the computer to shift 1st gear at 6400, what rpm does it actually shift at? Have you data logged the acutal rpms before the shift? Maybe the transmission takes 3/10 of a second to shift and you are at 6900 before catching 2nd gear. Maybe you should tell the computer to shift at 6100 in first if you are getting a few hundred more rpm before the shift occurs.