it's called throttle response, put big *** tires on a truck that doesnt have enough power/wt ratio in it and it's gonna perform like a slug. Crunch the #'s yourself... hypertech claims 19 hp figure the weight of the truck is 5500 lbs,

5500/245 = 22.45 (stock)
5500/264 = 20.83 (stock + hypertech)

start adding 1.7's or a cam, cut the runners on the intake, open the exhaust up to 3" single/2.25" dual with some good headers and your truck will start to move. Mine has the 4.11's with 295's on it which is close to a 34" tire. It hauled *** and got close to 14 mpg consistently. Everytime I took out the hypertech, I could feel a slight difference. add everything together and the truck will scoot pretty damn good.

when I had my modded intake (runners cut 1") the motor really woke up after 2500 rpms and was actually fun to drive. it pulled really hard up to 5200 rpms...

anyway, it's all in how you build up or what you bolt on your motor. all of the mods will not "stack" on top of one another but they will compliment each other in some way. some positive and some negative. some will help top end power but loose low end and vise versa. it's a balancing act between top end & low end.

anyway... i'm done

edit: oh yeah, i'm selling my truck because I need more room to comfortbly seat 4/5 adults and my current 2000 ram doesnt cut it.

 

If you look at most of those threads the hyper tech programmers were put on after they already had the larger tires on so again they should notice a difference.

Me I would rather put the money some where else before I did that. But Im not running my truck on the track either.

 

i have 3.55's on 285's.. so if i switch out to 4.10's would that really make a big diffrence in acceleration? also if i plan on getting 35's soon what gears should i get? whats a cheap place to go to get them?? sorry to steal the thread like this but i just saw that GODRAMIT is running 4.56's on 35's

 

If 4:88s were available when I regeared I would have gotten them. Im running about1800 to 2100 rpms at 60-65.

It will help your low end gains dramatically. IT is the single most effective mod you can do to your truck.

If you are going to go to 35s I would hold off on the gears until you get the tires. then go with either 4:56s or 4:88s
But I think the 4:88s would be a tad high for a street truck.

 

I plan on making that my next mod too. On their site their dyno tests show an average gain of about 15 hp/20 lb ft Tq for my truck and that is with stock tires and 3:55 gears. Right now I have crappy 3:21 gears (definitely on my list when I get the cash) and 265 tires. I realize I am undergeared, but shouldn't I still notice a difference if I get one? No, I don't have the death flash.

 

I also have 35's with 3.55 gears. Have a new set of 4.56 gears, but waiting on my friend to get time to install. Should put my RPM's around 280 higher than when stock. When running stock 265/75's I thought it could have used a little more gear. Tire size directly affects drivability. Spent a lot of time kicking in and out of OD. The 33's made some difference. The 35's turned it into a dog. Before I do any mods to other stuff I'm going to get the gears in to put the power to gear ratio back in line. Will help to see the effects. Like it is the headers made a small improvement. Just to bad they were junk and went back to manifolds.
As far as the towing. The only draw back I've had is the added tire height increased the sway in the truck when loaded. Combination of not having a rear swaybar and the taller rubber adds to the woller(southern), wallowing effect of the tire. Thought about dropping it back down. Not going to happen. Change gears and add a sway bar. Should be good.

As far as all the questions about what gear everyone should change to. That depends on your driving speeds and towing. Personally I want my RPM's closer to 2000 than the norm of 1500-1800. Too low and no umph. Too high and wear out the motor and eat gas. Just keep in mind that to low of an RPM and it takes a lot of energy to get the mass moving(like having a 4 cyl.) and OD is virtually worthless like mine. Do the calculation and decide what RPM range you want to run in. Our trans ratio is .690

Stock 70 X 3.55 X .69 X 336 /31.5 = 1828 60 X 3.55 X .69 X 336 / 31.5 = 1567 = In and out of OD
70 X 4.10 X .69 X 336 /35 =1901
70 X 4.56 X .69 X 336 /35 = 2114

How can I determine what ratio to use for my application?
A. mph x gear ratio x trans ratio x 336 ÷ Tire Diameter = RPM
Tire Diameter

Example:
70 mph x 3.73 (gear ratio) x .67 (trans ratio) x 336 ÷ 27(tire diameter) = 2176RPM


70 mph with a 3.73 ring and pinion over drive transmission in 4th gear with a 27" tire will perform at 2176 RPM

 

Very interesting....I have the 3.55, stock 265/75/16 tires, and at 70 mph the tach reads about 1900. Your formula shows 1828 - so it must be pretty close. Wonder what the optimum rpm for best mpg is? Anyone know?

 

I have heard it is somewhere between 1800 and 2100 rpm's (I think). I read it on another board where some guy did a bunch of tests and found that range provided the best mpg out of a 5.2. I assume it would be similar for a 5.9. On the topic of the hypertech, I noticed a big improvement when I installed mine, but as others have said, I was running it in combination with other mods. When I remove the program, there is a noticable drop in performance. That formula for figuring out rpm's is handy.

 

I've searched all over the place and i hope this dont sound dumb but.....what the heck is the death flash?

 

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