Quote Originally Posted by BrandonHall10 View Post
Why is it...

From a 40 roll, when I stab the throttle, it drops a gear and I can see the KR spike to 10+ degrees. I let off after a second, but not more than two.
BUT...
From a stop, or even if I'm already moving, if I roll the throttle to 100%, I can run all the way up to the shift with less than one full degree.

Current mods:
E85, 1;9RR's, Headers, 3.1" pulley. The only thing engine/fuel related I changed in the tune was scaling the injectors for E85.

Can someone explain why aggressive throttle entry would cause so much KR, but slow(er) entry would cause almost none? Just looking for knowledge.

Thanks.
I finally have an answer, because I just figured it out myself. At higher power levels the torque converter if stock will act strange sometimes. On a stock trans tune, the TCC does not unlock the converter until almost 50% throttle. That's an enormous amount of load placed on the converter that's suddenly broken free. This effect is amplified if you have a larger throttle body (I have a Northstar), as 50% throttle position on a N* is way more than the same TPS on an L67 TB... The result being the TCC stays locked far longer than it should.

For some reason when it releases under load it generates a noise that reads as a massive amount of KR.

I first suspected my 42# injectors were too small for the job so I put 60's on, only to have the same problem.

So, we lowered the TCC unlock threshold with the tuner to a more reasonable 25%... And voila, the KR was 1-2 degrees.

In other words, I just need a beefier torque converter.