I see that the HHr list the 260 hp on the manual and 235 hp on the automatic! Can anyone tell me what changes they made so I might boost hp on a automatic? Maybe a chip or power module? Also has anyone heard what they are going to do for the 09 model in the way of engine hp? Thanks

I see that the HHr list the 260 hp on the manual and 235 hp on the automatic! Can anyone tell me what changes they made so I might boost hp on a automatic? Maybe a chip or power module? Also has anyone heard what they are going to do for the 09 model in the way of engine hp? Thanks

hello and welcome......check out this section, along with the SS section. use the search, there are quite a few threads and many posts with all of the info you are looking for. The PPC tuner is out and available, but the auto version is still being worked on.......there will be choices in the future.....:smile:

I am willing to bet they aren't changing the power for the 2nd year of production. But yes, a PPC tuner would boost the power (when the auto is available) standard bolt ons such as exhaust and intake would help out a bit as well.

I've seen many different horsepower ratings for the A4 SS and from what GM Powertrain lists as the SAE J1349 test the A4 is 250 HP peak but limited to 222 lb/ft torque due to the maximum torque rating of the transmission. Horsepower is limited in 1st and 2nd gears by limiting maximum boost.

In case you haven't seen it, here is the SAE certified J1349 dyno graph:
http://www.andersonperformance.net/A4HHRSS_HP.jpg

So the auto should have plenty of HP for higher speed passes on the highway, correct?

So the auto should have plenty of HP for higher speed passes on the highway, correct?

Correct. 1st and 2nd gears are boost limited to 235 HP. At highway speeds in 3rd and 4th gears, the max HP is 250.

Correct. 1st and 2nd gears are boost limited to 235 HP. At highway speeds in 3rd and 4th gears, the max HP is 250.

awesome :bow:

Unless you are planning on Racing your SS I think the stock HP with an Auto is plenty. It has plenty of power that kicks in when you need it. I think once you get yours you will find that to be true. Wouldn't the dealer let take on for a spin? or didn't they have one? I took one on a 20 mile ride before I bought it and I was like this little thing has a WOW factor.

You can't get limited slip differential with the automatic. There is an after market limited slip differential available for the 4T45E automatic transaxle, though.

Unless you are planning on Racing your SS I think the stock HP with an Auto is plenty. It has plenty of power that kicks in when you need it. I think once you get yours you will find that to be true. Wouldn't the dealer let take on for a spin? or didn't they have one? I took one on a 20 mile ride before I bought it and I was like this little thing has a WOW factor.

Dealer only had a 5 speed so I drove that. I intend to drive the auto in the next couple days.

LSD is stock on the automatic

Victory Red 08 HHR SS

LSD is stock on the automatic

Victory Red 08 HHR SS


Wrong!!
The LSD is not available on an Automatic equipped car.

Currently, the general doesn't offer an LSD for the 4T45E transmission. You have to go aftermarket to get one.

Currently, the general doesn't offer an LSD for the 4T45E transmission. You have to go aftermarket to get one.

Where would one go for the aftermarket LSD for the automatic trans? Also many people have stated that the input shaft and lower gears can only take so much HP so the engine control limits power on the automatic.

Is anyone making upgraded/stronger parts for the automatic trans to beef it up so that it can handle the extra HP?

Beefed up 4T45E

http://www.transmissioncenter.net/

Limited Slip Diff for 4T45E:

http://www.engineered.net/eplsd.htm

I didn't see a full kit for the 4T45E. Just a 4T65E. Heck they just need to make an harden input shaft. the others are around 150-200 bucks on that site.