why the hp difference from auto to manual - ModernCamaro.com - 5th Generation Camaro Enthusiasts
V8 Engine Discussion 6.2L LS3/L99 V8 | Exhaust | Ignition | Induction | Intakes

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post #1 of 25 Old 09-27-2011, 04:08 PM Thread Starter
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why the hp difference from auto to manual

hi, does anyone know why the ss stick puts out 26 more horsepower than the automatic? someone told me the exhaust is different is that correct. thank you in advance.
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post #2 of 25 Old 09-28-2011, 05:45 AM
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The exhaust is a little different but it doesn't have anything to do with why the engine makes less power. There are some obvious differences in the two engines but I think the engineers had to walk a fine line to make sure that the A6 and M6 were almost identical in performance. While the A6 has a few less horsepower it has more aggressive transmission gearing. If the A6 had 26 more factory horsepower it would easily whip the M6.
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post #3 of 25 Old 09-28-2011, 10:52 AM
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In a nutshell, there is less compression on the A6 as it has reliefs for the AFM valve setup to operate. .3 to be exact. The A6 also runs VVT which has a more Torque oriented profile vs HP as they needed the auto to get to a certain MPG (all driven by CAFE standards)

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post #4 of 25 Old 10-06-2011, 11:52 AM
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I just read the other day that Chevy wanted the manual and auto camaros to be almost identical in performance.. so while the manual might have a bit more HP, the automatics have more aggressive gearing.. I believe I read it in my owners manual but can't remember for sure..
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post #5 of 25 Old 12-26-2011, 10:21 AM
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All you need is a Torque Converter, a custom tune to get rid of the fuel De activation and bump up your timing, then you will be beating up all them six speeds all day long....at the track and Automatic car always has the advantage.

I have three toys...
1-06 GTO A4... 556RWHP 508 RWTQ. high 10's 1/4 mile....CCW Drag Pack.
2-09 Z06 6 speed.. with just headers and a halltech CAI custom tune..508RWHP 492 RWTQ. high 10's 1/4 mile. CCW Drag Pack.
3-11 CTS-V Coupe 6 speed super charged.... custom tune and a pulley swap, 550RWHP 600RWTQ. Low 11's 1/4 mile. Drag Radials.
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post #6 of 25 Old 12-26-2011, 12:15 PM
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+1^ different cam in the L99 vs ls3. The afm is most of the reason for the hp drop. But stock vs stock the auto is a bit quicker in the 1/4.

Here's some good info:

http://www.superchevy.com/features/c...ons/index.html

"The LS3 develops 426 horsepower (318 kW) at 5,900 rpm and 420 lb.-ft. (569 Nm) at 4,600 rpm (all numbers are SAE certified). Output on the L99 is lower than the LS3 because of a slighter lower compression ratio (10.4:1 vs. 10.7:1) and design features of the Active Fuel Management System. The L99 is paired exclusively with an automatic transmission."

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Last edited by Strick; 12-27-2011 at 11:58 AM.
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post #7 of 25 Old 12-27-2011, 01:37 AM
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post #8 of 25 Old 01-02-2012, 06:13 PM
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Quote:
Originally Posted by bookemdano View Post
All you need is a Torque Converter, a custom tune to get rid of the fuel De activation and bump up your timing, then you will be beating up all them six speeds all day long....at the track and Automatic car always has the advantage.

I have three toys...
1-06 GTO A4... 556RWHP 508 RWTQ. high 10's 1/4 mile....CCW Drag Pack.
2-09 Z06 6 speed.. with just headers and a halltech CAI custom tune..508RWHP 492 RWTQ. high 10's 1/4 mile. CCW Drag Pack.
3-11 CTS-V Coupe 6 speed super charged.... custom tune and a pulley swap, 550RWHP 600RWTQ. Low 11's 1/4 mile. Drag Radials.


You do not need a Torque Converter to get rid of the AFM system. Just have your tuner deactivate it and its gone. Mine has been gone for a month now and I love it.

The tranny tune is the real kicker its like having a whole new car. If you really want to smoke the manual put 3:73 gears in the rear end. The manual's come with 3:45's and the auto's come with 3:27's. They purposely did that so the auto wouldn't embarrass the manual.
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post #9 of 25 Old 01-03-2012, 07:07 AM
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What's a good gear to install in the auto without getting horrific mpg?

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post #10 of 25 Old 01-06-2012, 01:13 PM
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Quote:
Originally Posted by Strick View Post
What's a good gear to install in the auto without getting horrific mpg?
3:70 or 3:73 some people put in 3:45's but I think its a waste of money

3:73 is what 99% of the shops will tell you is ideal. If you have an automatic transmission.

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