Im going to get my chip reburned here in the next week. What do most of you have your shift points set at? Im only running a Airbox mod at this time. Thanks

 

I just had mine lowered from 5400 to 5250 and the truck feels much stronger now. If you ever have a chance to look at a dyno chart you will see how much power you start loosing at the end of the power band.

Tha truck felt like it was winding out forever......now it gets into the next gear quicker and gets me going sooner

And if anything else.......it is WAY safer for my L now.

--Joe

 

Thanks Joe. Whats the fuel cutoff at right now?

 

For whats it's worth , i installed factory techs valve body kit , and had mark at lfp, leave torque reduction ON , and to LEAVE my line pressure alone= my tranny will last and still shifts firm , but not to firm. i personally think turning torque reduction off and messing with too much line pressure is a quick short life for the 4R100.

just my personal opinion..

 

What does that have to do with shift points.

My line pressure isn't increased at all either.

--Joe

 

Not sure......when I got dynoed he ran my L to 5800 rpms and still was running fine.

--Joe

 

Uh, Joe, the guy said "For what it's worth..." He was just trying to offer a little more helpful advice about a related issue. Maybe this guy didn't know that and it helped him out?

Jim

 

Some people have put on 4 to 6# pulleys and have complained that they have run out of "steam" at anything over 5200 rpms. Here's Sal's take on that:

As for what you should be shifting at, well, that's debatable, but I use a theory that goes a lil something like this:

You always want to be in the gear with the highest horsepower, as at any given speed that will provide the most rear wheel torque. Or explained easier, the trick is to minimize the change in momentum, so you pick the rpm that changes the least in hp when you shift.

Honestly, 5500 on our trucks should net the best performance. As for it feeling like it drops off read Sal's statement above. Once you do shift at a higher rpm, you will be in a healthier sweetspot of the powerband and thus you will continue accelerating at great pace. I know it sounds like a tradeoff, but if you do the math it'll show.

Here's an old post I had that I never totally got around to completing:

https://www.f150online.com/forums/sh...threadid=34302

Yesterday I toyed around w/ some new charts I had on my personal truck using the calculations in the above link, and I pretty much came up w/ 5500 shift points being best, though. I'm not sure what Sal recommends, but I know Johnny puts 5450 on most of his chips. Personally I recommend 5500 stock or w/ pulleys (so long as you have the filter to flow at the higher rpms w/ the bigger pulleys).

Last night I took my stock '02 Lightning to Mobile's 1/8 track toying w/ the idea some more. When I got to the track I programmed my Diablo chip I had laying around from my '01 for my '02. I left stock shiftpoints so it would shift before the traps (this was at an approx. 600 ft. track - a short 1/8), and then I reprogrammed the chip to increase my rpm to 5500 and rev limiter to 6k so I could pass through the traps w/out shifting beforehand. Net result was an impressive .02 to .04 e.t. gain in favor of the higher shiftpoints. I did 2 back to back runs each way so I could compare. My mph was very similar (do not have my slips right here in front of me).

It's fun to program now that I can do it

Hope this helps

 

I've done street car (mostly stock-to-light mods) dragstrip racing for years. And I can tell you I've only run accross one car in that time that did not net a better ET by "buzzing" first gear & maybe 2nd. As stated above it is slightly over revving, however you are in a better spot on the torque curve when the next gear engages.

I've done 1/4's hundreds of times & know what I've observed. (not done a L yet though)

Now I can't wait til Fri to give this beast a try!

 

thanks for that leg work! I appreciate it and will use that info when I burn my new chip next month.

brad

 

I don't feel that by lowering my shift rpms 150 less that I will hurt my ET's one bit, if anything I feel I will help them. I am still in my "power curve" when I hit second.

Also.....I feel that I am adding life to my motor by putting less stress on it from high revving.

WOT.....you should go to Milan tonight for T&T, we will all be there from 4-9. There will be quite a few fast L's there. It would be great to meet a new Michigan L owner.

--Joe

 

I think that is too much rpm's for our trucks. I would rather sacrifice .02-.04 (.04-.08 in the 1/4) to drive my L longer without any worries.

--Joe

EDIT........This is a great topic, much better than the usual
1) Which wax should I use
2) 03 Cobra times
etc
We need to discuss some technical issues more often.

 

I can totally understand your reasoning here. I will add, though, that it is rare that we're at redline when driving this truck the percentage of the time.

No friggin' doubt!!!

 

The whole reason i brought this up was when had my chip burned, i hadnt owned the truck to long. Didnt really know the shift points. I think its set to high imho on this chip. So im trying to narrow this down.

I do plan on throwing a 4# pulley on here soon.

Is there any things that should be changed in this chip program for shifting? I know he made it firmer. Any kind of #'s or codes he can punch in?

BTW. This is a Diablo Chip.

 

In the for what it's worth dept:

I was running a 2lber and shifting at 5500. Like abunch of fella L owners I was worried about " them thar rods." After speaking to Sal, I went to a 4lber and lowered my shifts down to 5200. Now I have no info to back it up, but the truck STILL feels strong on the street As for the .02 to .04 I might be leaving in the chip, well, I sleep better at night