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Tranny shifting too hard with Hennesey tune

I have 2011 with a 445 max boost kit. Took a bit but I finally have the tune sorted out. Had to put 2012 plugs in my 2011 to handle the extra HP. My issue is the tranny. When getting after it in a downshift situation the shift is violently hard to the point I think something in the...
- Rwood_devil
- Thread
- Dec 27, 2014
- Replies: 9
- Forum: Generation 4 - General Discusson
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NEWB Hennessey Issue

Yeah, generally I'm a research first guy. But I got in a hurray and took the word of a friend who had always given good advice before. No more Hennessey for me. A hard lesson to learn. Based on the messages here, I am going to ask for a reinstall of the intake side of the kit and...
- Rwood_devil
- Post #10
- Nov 9, 2014
- Forum: Generation 4 - Performance Upgrades
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NEWB Hennessey Issue

Your are right on what is in the 445 package. I am not sure how hp is measured but I can assure you a VERY noticeable increase in power and fuel economy. The exhaust note is very sweet. If my SHO was a legit 5.2 0-60 car before it is certainly a second faster now. It will chirp the tires...
- Rwood_devil
- Post #7
- Nov 8, 2014
- Forum: Generation 4 - Performance Upgrades
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NEWB Hennessey Issue

I have a 2011 SHO and recently had a 445 max Boost installed by my local dealership. The performance is outstanding and the MPG is up a full 2 MPGs. Here's my problem: The car is making a wheezing (sounds like an owl hooting noise) when on or off the throttle. Hennesey has been very slow...
- Rwood_devil
- Thread
- Nov 8, 2014
- Replies: 9
- Forum: Generation 4 - Performance Upgrades