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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
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02-22-2015, 11:06 AM | #1 |
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most power NA e85 6AT
hey everyone just traded my 2001 corvette z06 for a fr-s and chose and the wifey talked me into an AUTO, any who my question is whats the max hp ppl have been seeing with a tune and e85 on an AUTO with and without boltons
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02-22-2015, 12:20 PM | #2 |
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170-200 give or take (unless your definition of bolt ons includes a bolt on FI kit. In that case as much as you're willing to push it)
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02-22-2015, 03:26 PM | #3 | |
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see Basic Bolt on mods link below. |
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02-22-2015, 05:22 PM | #4 | |
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4.88 a/t vs 4.10 m/t 1st@25mph = 5891/5072 a/t 2nd@30mph = 4116/3673 a/t 3rd@60mph = 4412/5174 m/t 4th@60mph = 3996/4072 m/t 5th@60mph = 2849/3357 m/t 6th@60mph = 2326/2575 m/t Leaving in the 4.10:1 FD is even worse, see below; 4.10 a/t vs 4.10 m/t 1st@25mph = 4949/5072 m/t 2nd@30mph = 3458/3673 m/t 3rd@60mph = 3706/5174 m/t 4th@60mph = 3357/4072 m/t 5th@60mph = 2394/3357 m/t 6th@60mph = 1954/2575 m/t 5th gear in the A/T is still higher than 6th gear in the M/T! The A/T with a 4.88 FD is able to use 6th gear quite easily in the city, as low as 35MPH, offering a bit better city mileage and much more power to the ground. The bottom line is, don't try to race a M/T. A good driver can put down more power to the ground than you can. Which more than makes up for time lost shifting. Also, if you're not going to track the car, replace the stock front sway bar with Cusco's 16mm hollow front sway bar. It's 21% softer than stock, and helps eliminate cross-talk in the front end over large slow-speed bumps, giving a much better ride in the city, especially if the roads suck where you live. |
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02-22-2015, 11:35 PM | #5 |
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@KoolBRZ
Hmmm think you are confusing horsepower and torque HP = Torque x RPM ÷ 5252 derivation http://www.epi-eng.com/piston_engine...and_torque.htm A gearbox or final drive will change the torque and rpm but wont change the power (other than the loss through the driveline) Last edited by steve99; 02-23-2015 at 12:19 AM. |
02-23-2015, 01:31 AM | #6 | |
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02-23-2015, 01:47 AM | #7 | |
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I give up |
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02-23-2015, 02:43 AM | #8 |
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You are both right. Changing the gears in the rear differential will not give you more power or torque at the crank. It will increase torque to the wheels. By going to the 4.88 gears from the 4.10 gears, you are essentially changing the lever arm length that the engine torque is applied to. The bigger the lever arm, the more force applied. The cost of that is distance, your engine now has to turn more to cover the same ground, hence the higher rpm at a given speed.
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The Following User Says Thank You to TorqueMan777 For This Useful Post: | sachu (02-23-2015) |
02-23-2015, 03:31 AM | #10 |
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+1
Auto is fine, it makes the same power at wheels as MT, so just read steve's sticky. |
The Following User Says Thank You to Wayno For This Useful Post: | steve99 (02-24-2015) |
02-23-2015, 04:04 PM | #11 |
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Torque to the ground.
1st Gear - 3.626 M/T, 3.538 A/T Final Drive - 4.10 3.626 x 4.10 = 14.8666 absolute ratio. 3.538 x 4.10 = 14.5058 absolute ratio. 3.538 x 4.875 = 17.2478 absolute ratio. What this means is that, for every turn of your wheel, your crank will have turned 14.5058 times in the A/T, 14.8666 times in the M/T. From this, we can calculate the total torque produced to the ground: Absolute Ratio x Engine Torque = Torque to the Ground 14.8666 x 151ft lbs = 2244.8566ft lbs of torque per revolution of the wheel in the M/T W/4.10 FD. 14.5058 x 151ft lbs = 2190.3758ft lbs of torque per revolution of the wheel in the A/T W/4.10 FD. 17.2478 x 151ft lbs = 2604.4103ft lbs of torque per revolution of the wheel in the A/T W/4.875 FD Based on formulas presented by user, "mfactory" at the following website. http://www.ek9.org/index.php?threads...-friend.10883/ Last edited by KoolBRZ; 02-23-2015 at 04:49 PM. Reason: Added 4.875 numbers. |
02-23-2015, 04:42 PM | #12 |
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Where the rubber meets the road.
At 25MPH the stock tire turns 352.0458RPM's. (25MPH/60 * 844.91 Rev's per mile)
Per @steve99's quote, HP = Torque x RPM ÷ 5252, so to figure Horsepower to the ground..... The A/T has 2190.3758ft lbs of Torque to the Ground in 1st gear w/4.10 FD. 2190.3758ft lbs x 352.0458RPM's divided by 5252 equals 146.8227 Horsepower The M/T has 2244.8566ft lbs of Torque to the Ground in 1st gear w/4.10 FD. 2244.8566ft lbs x 352.0458RPM's divided by 5252 equals 150.4746 Horsepower That's 146.8227 Horsepower for the A/T, versus 150.4746 Horsepower for the M/T. Now let's change the FD of the A/T to 4.875 and leave the M/T at 4.10. That changes it to 174.5757 Horsepower for the A/T, versus 150.4746 Horsepower for the M/T. This makes changing the FD to 4.875 the most affordable horsepower gain of all! This change is also cumulative with other changes, so if you add 20HP with a header, it would be a true 20HP gain. |
02-23-2015, 05:38 PM | #13 | |
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Quote:
The lower F/D will increase in gear acceleration and will be an overall improvement to acceleration for the auto relative to the manual box as it has wider gear spacing.
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02-23-2015, 09:25 PM | #14 | |
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