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What is the main reason for the sluggish feel?
- Thread starter KichoRebel
- Start date
John Kloehr
Well-Known Member
Adjust computer for tire size just to get shifting and the speedometer right. The extra diameter will hurt felt torque a bit (can calculate that), the extra weight is harder to judge but accelerating a heavier wheel and tire combo will hurt felt torque (will feel sluggish).
From the other direction, once purchased a used Mercedes with very light wheels and tires (Mercedes spec but dealer add-on for first owner fitted after manufacture). Did not realize what a difference they made until after it got totaled. The identical replacement car with stock rims and tires was just not as peppy, especially as speeds increased. Both felt about identical off the line, but 25 to 50 mph was a night and day difference. Rotating mass makes a big difference.
From the other direction, once purchased a used Mercedes with very light wheels and tires (Mercedes spec but dealer add-on for first owner fitted after manufacture). Did not realize what a difference they made until after it got totaled. The identical replacement car with stock rims and tires was just not as peppy, especially as speeds increased. Both felt about identical off the line, but 25 to 50 mph was a night and day difference. Rotating mass makes a big difference.
akostaac
Active Member
This is why it is so important to recalibrate your speedo so your transmission shift points are where they need to be. I learned this with my 4th gen lifted and 35in tires. I drove away from the shop that installed the lift and tires and by the time I got home I was googling why the transmission or truck rode differently than before. First thing I found was, Did you recalibrate your speedometer? I recalibrated the speedometer right away and the truck was back to normal. Don’t get me wrong, you will feel the weight of the tires but it will shift smoothly and you will not feel sluggish. I have calibrated all my trucks ever since if I increase the tire size.
you might not have the gearing in the diff to turn those bigger tires properly,A guy i worked with year's back Had a gmc yukon blazer up graded the tires and you could tell the difference right sluggish like you said.
John Kloehr
Well-Known Member
If you suspect the aftermarket intake is causing at least some of this why not stick the stock intake back on and see if there is a difference in how it feels to you? The stock intake is a factory CAI. If you are pulling in air from the hot engine bay you are doing nothing to help the engine breathe better.
yes you are correct ,
KichoRebel
Active Member
Sad after spending close to $400, Yes after spending more days with the mods, it does have to do a little bit with the hot air I think. Some days when it is not extremely hot , the truck's response feels better.
KichoRebel
Active Member
I haven't not yet, looking at Pulsar and other plug in Tuners that could do the recalibration and maybe some hp gains...
What do you recommend, how did you recalibrate yours?
Thanks
akostaac
Active Member
Alfaobd will do it if you have one and if not I suggest you get it because you will be able to do few changes to the truck for free that otherwise you may need to pay for someone else to program it in your truck.
CHeYeNNe71
Spends too much time on here
Ok a few things you can do. First recalibrate your throttlebody, yes this helps.
Next I'm running 3" lift with almost 35's and MOPAR CAI and Carven full exhaust, plus the Pedal Commander ( throttle controller ) and Edge Pulsar which does add power, plus Plug n play. I don't have a warranty to worry about, but ran on my 4th Gen w/ 6" and 37's.
I also have a topper to add more weight, oh and 3.21
KichoRebel
Active Member
Beautiful truck! Looks great.Ok a few things you can do. First recalibrate your throttlebody, yes this helps.
Next I'm running 3" lift with almost 35's and MOPAR CAI and Carven full exhaust, plus the Pedal Commander ( throttle controller ) and Edge Pulsar which does add power, plus Plug n play. I don't have a warranty to worry about, but ran on my 4th Gen w/ 6" and 37's.
I also have a topper to add more weight, oh and 3.21
View attachment 204207
Thanks for the tip on the throttle calibration. I will try that today.
I like the the plug in Pulsar, I think I will def end up buying it, I just didn't have it in my budget so quick haha.
Do you mind sharing if it is really worth it, you did see the difference when putting the performance setting?
Thanks
CHeYeNNe71
Spends too much time on here
Considering I ran it on my 4th Gen and bought again for the 5Th Gen. I think it's worth it and if you can find used for a good price, even better. I bought both of mine used. Look on FB Marketplace.
Just make sure to run proper fuel for the tune you choose to use. I like the ease of changing tune on the fly, Shuts off MDS and not having to run premium 24/7 if you don't want to.
KichoRebel
Active Member
I ended up buying the Diablo I3 w/ PCM swap, it arrives on Wednesday.
It can help me with the tire correction but will help increasing HP too.
Ram pride.... can't lose this weekend off-roading to the Silverado, Jeep, GMC, F150, Hilux, Bronco in our group. My Ram won last time, they all did mods like headers and tunes, CAI etc. Simple stuff, but just can't lose.. lol..
It can help me with the tire correction but will help increasing HP too.
Ram pride.... can't lose this weekend off-roading to the Silverado, Jeep, GMC, F150, Hilux, Bronco in our group. My Ram won last time, they all did mods like headers and tunes, CAI etc. Simple stuff, but just can't lose.. lol..
CHeYeNNe71
Spends too much time on here
Get'R Dun! 
KichoRebel
Active Member
For whoever looks at this post in the future...
Going to 91 octane tune with I3 Diablo definitely brought back what was lost with the initial mods for off-roading. (Now on 35s Toyos Mud Terrains)
But.... this is, a never ending quest I guess...
Next week I'm installing Long Tube Headers from Stainless Works and full Cat Back (no resonators) I'm a little concerned about how loud it will get. I do love the deep tone rumble but do not need to wake the whole neighborhood. We will see, I will keep resonators just in case...
Plus a Hemifever Stage 1 + Trans Tune.
Hopefully I can reach the 460 - 480 hp on my "butt dyno".
Really having fun with this...
Going to 91 octane tune with I3 Diablo definitely brought back what was lost with the initial mods for off-roading. (Now on 35s Toyos Mud Terrains)
But.... this is, a never ending quest I guess...
Next week I'm installing Long Tube Headers from Stainless Works and full Cat Back (no resonators) I'm a little concerned about how loud it will get. I do love the deep tone rumble but do not need to wake the whole neighborhood. We will see, I will keep resonators just in case...
Plus a Hemifever Stage 1 + Trans Tune.
Hopefully I can reach the 460 - 480 hp on my "butt dyno".
Really having fun with this...
I've been trying to buy a set of longtubes that are on local marketplace for a couple months. Initially the seller was responsive, and we even set up a time for me to come buy them. Then he said his evening plans changed and we would have to reschedule. That's about as far as it's done. He's ghosted me since. listing is still up. Even had my step-son message him, and he hasn't responded to him either.
KichoRebel
Active Member
Yeah, I tried for like 4 weeks straight stalking the marketplace to see if I could buy some used ones. But I did not see anything for the 5th gens.
There are available for the 4th gens or classics though
Unfortunately, 5th gens are very expensive.
There is conflicting information online on whether or not the 4rh gen longtubes will fit or not. The ones I was looking at were 4th gen JBA headers BNIB. I was going to make them fit one way or another.
