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Old 07-22-2013, 08:19 PM   #1
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Automatics and manuals

Do autos have less rwhp and why? Was trying to get over 300 hp in my 96 gt and found out my auto has about 20 less than a 5 speed and there was a difference between rwhp and bhp. Now I'd just like to get to 270 rwhp if possible.
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Old 07-22-2013, 08:26 PM   #2
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Yes. And I doubt you'll get there without head work.
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Old 07-22-2013, 08:26 PM   #3
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Yes. Automatics have more internal parts to move than a manual so they require more horsepower to turn those extra parts. The term is drivetrain loss, usually manuals only have 15% loss versus an automatic is closer to 20% or 25%. A PI swap will get you close to 270whp right off the bat. If you port and polish the heads along with some cams and full bolt ons you should hit that no problem.
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Old 07-22-2013, 08:36 PM   #4
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Oh cool. I'm almost done with the PI swap now. Having to do it on the weekends and in the middle of the night to avoid heat. Just now getting to the heads this weekend. How would i port and polish the PI heads I have now? Also doin a jmod after we're done.
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Old 07-22-2013, 08:53 PM   #5
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Oh cool. I'm almost done with the PI swap now. Having to do it on the weekends and in the middle of the night to avoid heat. Just now getting to the heads this weekend. How would i port and polish the PI heads I have now? Also doin a jmod after we're done.
Well it's a bit late if they are on the car already. Horsepower TV made a good video on how to port and polish a set of heads
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Old 07-22-2013, 08:55 PM   #6
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Still in the box. Ill check it out.
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Old 07-22-2013, 08:56 PM   #7
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Still in the box. Ill check it out.
Alright good luck! I would recommend sending it to a shop to have it done but that's just me.
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Old 07-22-2013, 09:08 PM   #8
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Was thinking that too. How long will it take for the machine shop to do it and how much you think?
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Old 07-22-2013, 09:10 PM   #9
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Was thinking that too. How long will it take for the machine shop to do it and how much you think?
I honestly have no clue. Best bet is to call around to different shops.
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Old 07-22-2013, 09:22 PM   #10
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Ill call a cpl tomorrow. Thanks for the suggestions
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Old 07-23-2013, 09:06 AM   #11
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You might as well just buy a set of PP'd heads if you are going to do ported heads. MHS stage 2s will run $1500 and change. I'd honestly bolt the stock PI heads on and go and then look at supercharging it down the line but that's just me.

As for automatic vs manual... RWHP is just a number, autos will NEVER make as much power on a dyno as a 5 spd will. With that said, a properly setup automatic will skull**** the stick shift in a drag race, even one making more power. The torque multiplcation of a good stall converter coupled with the speed a good auto will shift at makes the auto come off the line way harder and a lot more consistantly. Even at bolt on PI power levels a good auto will go mid 12s in the 1/4 mile. Guy at a local track near me went from high 12s/low 13s to mid 12s just swapping in a 3500 stall.

And before this turns into a stick vs auto debate... for a track car there IS NO DEBATE, the auto is the king of the 1/4. For a street car its all personal preference, for a corner carver the manual rules there.
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Old 07-23-2013, 09:50 AM   #12
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Very well said^

Though I would still say get a P&P while they are still sitting in a box.
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Old 07-23-2013, 02:51 PM   #13
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Looks like its gonna be a little out of my price range. I think with gears, j mod, a tune, and maybe some bolt ons after were done with the PI swap it will be as fast as a cobra which is basically my goal.
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