BB tune shifting

[redemn93]

how much HP difference between 93 and 89?

ditto

 

[Max]

Depends on the truck. I'd say 5hp-20hp it really depends on the modifications and a number of other factors. Most lightly modded trucks will probably see a gain of 5-8hp by running a bit more timing.

 

[Sasquatch]

i dont know what the HP gain is between the two but i could feel a little difference when i went up to the 93. the biggest difference i saw was MPG. i recently went on a trip to the jersey shore (about 100 miles one way) and i got 22.3 mpg all highway at about 70-75 mph. around town i average about 16.5 mpg.

the reason i switched to the 93 octane was obviously for more power and the fact that every gas station i have a card for only has 93 octane so i figured, if i`m using 93 anyway, why not get the tune to match? either tune really wakes up the truck and makes it alot more fun to drive!

and for comparison i have a 2005 yukon 4x4 with 3:42 gears and 275/55/20 tires, spectre cold air intake and a flowmaster catback exhaust.


i just recently found a shop with a chassis dyno. if i get bored i may swap my stock pcm for a while and dyno it then swap back to the tuned one to see the difference. i just dont know how long it takes the truck to adjust to the pcm swaps so i can get a correct dyno reading. i`d have to get two seperate dyno runs at $75 each for 3 runs.

 

[MASS-HOE'Z71]

Might have to go for a 93 then, gas prices are coming down, sorta, and 22 mpg on the highway sounds alot better than what I'm gettin on the highway

 

[Rollin Thunder]

im at 100% removed and my 1-2 shift At like half throttle is actually alot harder than at full. Also if I floor it at like 25-30 and let off light right before its supposed to shift it slames in to gear and not the chirp slam. Like a jammed gear slam, I do this on the yukon and it still does the shift, but I dont feel it at all. It really sucks actually and dont know if somthing is wrong or if thats normal. but 2-3 and 3-4 are like silk.

 

[Max]

Hmm that's strange mine is smooth as butter every shift.

 

[Sasquatch]

all my shifts are harder. even the third to overdrive shift is impressive.

 

[MASS-HOE'Z71]

Well 93 it is after sum gas station investigating it's only like 10 cents more a gallon than the 91, then probly 75% tm removal and the firm shift point opt and take off the speed limiter, still gotta ask him about the tires tho since Im puttin the stock rims back on for the winter so their significantly smaller than the 22 inch rims for the rest of the yr, that is until I go for 24's next yr perhaps