Ok guys, let me pick your brains for a minute. I am trying to figure out why my truck has much less throttle response than my roommates truck. My truck is an '04.5, DRW quad cab with a 6- speed, running a Juice w/ Attitude.

My roommates truck is an '02 3/4 ton short bed extended cab, 6-speed. He has a DD True Torque Module on it and an open air fliter. I think it is a K & N but, don't remember for sure. He also has hummer rims on it with the 35's and 3.54 gears. My truck has 3.73 gears.

We had to switch trucks the other day so he could drop mine off for some hitch repairs and I noticed a HUGE difference off idle in throttle response. In his truck, when you touch the go pedal, you immediately feel the torque and it takes off. In my truck, the go pedal feels a bit mushy until is gets spun up.

Is the difference due to all the emissions programming on the newer trucks? Is it something to do with the common rail injection? I ask that because my Dodge has similar throttle response to my Duramax that I sold.

We were talking last night about this and he noticed the difference too but, neither of us are completely sure why that is. He did say that his truck was similar in throttle response from idle as mine when it was stock. He said the DD box is what made the difference on his.

I just don't understand why the Juice w/ Attitude would not produce similar results unless I am just too stupid to use the box properly.

By the way, I had the Juice set on level 4 when he took my truck, that way it would be making similar power to what we know he has put down on the dyno.

 

Only thing I could think of is that it's due to emissions.

 

Yes, it's due to emissions. The new ECM curves force the boost pressure to build before adding more fuel. A box helps, but some more than others. Most boxes intercept what the ECM is saying to do, and amplify it by a % increase... but a higher % of 0 is still 0 if ya know what I mean. Personally, I don't mind this "delay" as it makes it easier to drive "economically" around town, but the power is still there if you need it. If you need to be really quick off the line, build up 3-5lb of boost before you let go of the brake.

 

I figured that was the case. Thanks for the info. As far as boost off the line, that is really hard on a clutch with a 6-speed