Torque Management?

4.6 Punisher · #1 Fri, October 22nd, 2010, 10:21 PM

Last week I had a set of 4.30 gears installed in my truck. Sadly, performance gains were not nearly what I had expected. I thought that going from a 3.55 ratio to 4.30's would be a game changer, but it really hasn't. 0-60 times are JUST better than stock. 7.9 was the best I could manage yesterday, 3.55's were like 8.5ish.

I've also noticed that there is a hesitation feeling when I'm taking off. Kind of like losing traction, but not. Someone suggested that torque management could be to blame. It doesn't feel like the tranny is slipping, RPM's are steady through the gear. I'm also using an 87 performance tune built from early this year. The only changes since then is the gears and the H-pipe was swapped to an X-pipe. Could the old tune be specifically catered to that gear ratio and not be playing well with the new ratio?

PS: Shift firmness felt stock so I bumped it up to +10 +10 +8. Any risks?

***Longshot270*** · #2 Fri, October 22nd, 2010, 10:51 PM

Did you gradually bump them up? Have you driven since making those changes? Dont want it to shift too hard because it will cause more strain on other parts of the line.

I'm assuming you have made the correct changes in the custom options menu?

4.6 Punisher · #3 Sat, October 23rd, 2010, 12:22 AM

Yeah I have made all of the proper setting such as tire size, gear size, shift firmness, and speed limiter, but nothing else. The custome tunes never had a very sporty feel to them. Maybe I didn't specify what I wanted in the order form properly. There's still a throttle lag and the shifts were OEM spongy when I got them. I bumped them to +5 +5 +3, then +7 +7 +5, now +10 +10 +8.

The whole hesitation or "loss-of-traction-but-not-really feeling" has been going on for quite a while now. I first noticed it a few months ago, but didn't think anything of it. I haven't made any shake down runs until recently, and rediscovered this.

***Longshot270*** · #4 Sat, October 23rd, 2010, 12:33 AM

Ok, I'll leave a post for Bill to look into your file but I doubt he'll get to this until sometime next week.

4.6 Punisher · #5 Sat, October 23rd, 2010, 12:35 AM

Thanks, I've been meaning to call him about the shift firmness and how I changed them for about 6 months now, but always manage to get side tracked.

***Longshot270*** · #6 Sat, October 23rd, 2010, 12:49 AM

Yeah, I left him a post. Not sure what he'll do since you've had the tunes for a while.