valve body, and shift firmness

Lightning and Harley Davidson F150, powered by a supercharged 5.4L 2 valve engine
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lightning666
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valve body, and shift firmness

Post by lightning666 » Tue Oct 23, 2007 4:33 pm

I have a valve body from LFP installed in my trans, and I was under the impression that when you have one of these installed your not suppose to mess with the shift firmness. Well I just got my special forces installed, and I left the shift firmness stock and it is shifting really soft now, just like stock. It was shifting hard before the SP. Should I mess with the shift firmness or is it something else. I have the commando also.
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sniperpat469
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Re: valve body, and shift firmness

Post by sniperpat469 » Tue Oct 23, 2007 4:47 pm

SF dosent change softer or harder if nothing is selected.
so there should have been no change, what could have happened is the adaptive learning was cleared and that can cause the shift to be different.
if it is too soft then I would select the next firmer setting and try it.

Patrick
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Dcwarz
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Re: valve body, and shift firmness

Post by Dcwarz » Wed Oct 24, 2007 9:36 am

Patrick,

The LFP valve body is an altered version with stronger springs to give a faster shift "manually" not having to increase the pressure which can take it's toll on a stock tranny.

Since I have a TSI built tranny guaranteed for 1K lbs of torque I get to play around a bit. The valve body was reamed out and new bigger components added.

While playing with the Trans settings from stock to race I noticed at the stock setting I got the dreaded shift "fart" back at shifts. That is when the PCM cuts power right at shift point at WOT to save the tranny.

Now on race setting it is very harsh on the street and the pressure setting is raised to .7XX. OK for a few runs at the strip but not good for an a street setting.

At firm it is still a little hard for the street.

At mild is just about right for street yet elininates the "fart" of the stock setting.

In Delta the best all around setting I found so far is .250 for street and this should work for the track, also it won't be too harsh for stock trannys. It is a quick shift but not one that slams in place.

Stock setting displayed in Delta is .129

A suggestion........ What might help in SF is to have a setting that just turns off the Lightning "fart" setting that way users of the LFP or other mechanical valve bodies could just turn off the engine power cut and have the "mechanical" shift built into their unit work as expected.
Dennis W.
Hollywood Racing
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lightning666
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Re: valve body, and shift firmness

Post by lightning666 » Wed Oct 24, 2007 12:58 pm

thanks a lot man, I couldnt of asked for a better answer
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Dcwarz
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Re: valve body, and shift firmness

Post by Dcwarz » Wed Oct 24, 2007 1:30 pm

lightning666....

My pleasure, going through the problem with a tranny rebuild a couple years ago gave me some good insight as to what our L's can handle. After installing the FTVB I loved the 2nd gear tire chirp however it did take it toll on my tranny. Eventually my 60 foot times started dropping so I increased my mods, all to no avail.

Finally, the tranny gave me enough signals that it was going south. Luckily, I hit the rebuilder during a slow time of year and got a new one with 2600 stall for less than what Ford was charging for a stock trans only.

Timing is everything and being lucky on that one.
Dennis W.
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Commando adjusted

lightning666
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Re: valve body, and shift firmness

Post by lightning666 » Thu Nov 01, 2007 12:03 am

I have adjusted my shifts to firmness, and its still not shifting like it did. It was shifting a whole lot better. It just feels like its forcing itself to shift like this. Before it would just kick, and chirp the hell out of the tires. Now it kinda just bangs, but doesnt feel good.
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RRT
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Re: valve body, and shift firmness

Post by RRT » Thu Nov 01, 2007 2:24 am

Did you drive your truck with the tune for more then a few drive cycles, cause like patrick mentioned fords adaptive learn strategy clears itself on every new flash so say you put a tune in it take it around the block dont like the shifting then go back and put another tune in it the pcm will never learn its strategy of how the driver likes the shifts. If you have driven it alot under heavy accleration so it learns your driving style and it still shifts weak i would recommend getting the EPC pressure checked by a ford dealer or even pull the sniper tune out and go back to the orginal and see how it reacts. Hope this helps
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Dcwarz
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Re: valve body, and shift firmness

Post by Dcwarz » Thu Nov 01, 2007 7:04 am

Put the tranny shift to Mild if you don't want it at stock, that is closest to the stock setting.

Firm is a whole lot higher line pressure and shifts will bang in.

Tranny settings as displayed by Delta:
Firmness........ (gear to gear)
Stock = (1~2) = .109; (2~3) = .125; (3~4) = .129
Mild = (1~2) = ..258; (2~3) = .273; (3~4) = .277
Firm = .(1~2) = .400; (2~3) = .422; (3~4) = .426
Race = .(1~2) = .707; (2~3) = .723; (3~4) = .727

A stock tranny will not last long at Firm of Race. This was proven by many L owners when an East Coast tuner added line pressure to his tunes back in the early days of the Gen2 L.

If you have Delta I would suggest to lower the tune to .200 or a little less say .150. That should work out well im most situations.

As for the Adaptive learning by the PCM, I do not believe it will "learn" trans shifts. It is more for overall engine driving manners, agressive vs sedated. I've never noticed any difference with tranny shifts after resetting my PCM at the track then driving home, shifts stood the same.
Dennis W.
Hollywood Racing
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Commando adjusted

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Re: valve body, and shift firmness

Post by lightning666 » Fri Nov 02, 2007 1:17 am

I'll try setting them to that see how it feels, thanks
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