N/A power topic, how much do you think these would make?

[Dr. BRZ]

Originally Posted by Teseo

If you do 100mph i presume is on highways, i do on canyons/touge and barely i git 65mph for a brief moment. You have full exhaust?

Nah, on the actual streets man! Lol. I have learned anything over about 107, our cars dont have the torque to keep going so thats why i only race to 100. I wish we had canyon/touge runs here but it’s Oklahoma, FLAT everywhere. Lol
Yeah, i have the full tomei exhaust system, including headers.

[Submarinesonce]

you picked a pretty awful car for highway roll racing...you also picked a pretty bad hobby. gotta be a drag strip somewhere.

[Submarinesonce]

OP e85+bolt ons generally gives you 200+-5 or so whp, which translates into 13.9-14.3 @100-97mph 1/4 miles....ish. ill say that the car is much more punchy in the midrange than it was stock...its also a lot, lot louder

[bfrank1972]

Originally Posted by skogs

In a track car the peak power is obviously important, but in a daily driver the midrange is way more important. To only talk about peak power gets kind of pointless in that regard.

An UEL header and tune may only give a few percent increased peak power. No matter how finely tuned your butt-dyno is, you won't notice 5% increase in power at 7000rpm. But in the usable range you might see gains of more than 20%*, anyone will notice that.

Also be aware that there is always a cost to your mods. Typically increased noise and loss of power in the lower rev-range when fiddling with exhaust and intakes. I'm not hating on mods in any way, its just something to be aware of.

*source

Hits the nail on the head - "how much power will this make" is pretty meaningless. You could have a car with mods that makes 20 hp more than stock at peak and is slower than a stock car. You could have a car with 5 hp *less* than a stock car and it would be faster in almost every situation you could think of. The shape of your torque curve is what matters, not one single number - doesn't matter if you're on a road course, drag strip, autoX, 'street race', or just normal driving.

Out of that list, it's the headers, E85, and tune that will make the difference - the rest will be marginal investments. Tune+E85 will get you more mid & upper end power on a stock car, and your peak will probably go up 20-25hp. Add headers to that, your peak *might* go up 10hp, but you'll get a huge fill/bump in the lower mid (3000-5000 rpm) with a *good quality* header (EL or UEL). That mid range bump will make your car feel noticeably faster and more responsive to drive despite your peak HP not going up that much.

One last thing - "UEL header" is also a too generalized. Headers themselves vary on what they do for your torque curve based on their design. Cheap headers may not do a whole lot at all over stock header. Pick based on quality & the sound you want - lots of specific header info on this forum. Good luck!

[nikitopo]

Originally Posted by bfrank1972

Hits the nail on the head - "how much power will this make" is pretty meaningless. You could have a car with mods that makes 20 hp more than stock at peak and is slower than a stock car. You could have a car with 5 hp *less* than a stock car and it would be faster in almost every situation you could think of. The shape of your torque curve is what matters, not one single number - doesn't matter if you're on a road course, drag strip, autoX, 'street race', or just normal driving.

Do you shift down when you want to drive fast? What's the point to have middle rev power if most of the time you are above 5k rpm?

[churchx]

When driving normally in traffic, i usually am at 1.6-3k range, when on track - at 4k to redline. Bumping mid rpm power/torque seems way more important to me too vs high top rpm output that i'll be at for very short amount of time before gear switch up. Nikitopo: do track logging. Even on track very top range might be at <5% of time, thus having better performance at more often used 2/3rds of range sounds more actually improving things no just by meaningless top numbers.

[skogs]

Originally Posted by nikitopo

Do you shift down when you want to drive fast? What's the point to have middle rev power if most of the time you are above 5k rpm?

That's probably why subaru decided it was a good compromise the let this engine come with such a deadzone in the midrange. Either you cruise around at low revs, or scream through the mountain roads right at the limiter. And that is what this car is all about, so it's ok.

Personally, driving stock i often found myself struggling to get out of the 3.5-5k deadzone. Changing down into 2nd at 60kmh just to avoid this is not for every occasion. Especially if you have a passenger. Now with a good set of headers and a tune, i don't have to constantly chase that 5k+ rev-range.

[bfrank1972]

Originally Posted by nikitopo

Do you shift down when you want to drive fast? What's the point to have middle rev power if most of the time you are above 5k rpm?

Most normal driving is done below 5k. I'm speaking from personal experience, my car is daily driven, and I'm no granny driver. Do you have an aftermarket header?

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[nikitopo]

Originally Posted by skogs

Personally, driving stock i often found myself struggling to get out of the 3.5-5k deadzone. Changing down into 2nd at 60kmh just to avoid this is not for every occasion. Especially if you have a passenger. Now with a good set of headers and a tune, i don't have to constantly chase that 5k+ rev-range.

Yes, an aftermarket header helps the drive-ability and not need to rev always high. The only real issue of stock car is when switching from 1st to 2nd where even if you change gear at redline, the revs go below the 5k area. This can be solved by a closed gear ratio. I never did this change, because it is not my style chasing others between traffic lights or doing 1/4-mile timings.

[churchx]

nikitopo: It's not that much of an issue in reality imho. After all, due gearing/high torque at low gears car is able to pull rather good even if a bit below optimal powerband, and it's 3rd/4th/5th that may see some lack of stock NA power. No wonder that TRD/Cusco advises to use their close ratio gearset together with different FD, so by their suggested setup combination 1st/2nd stays somewhat same, but it's more like if top 4 gears instead of first two become better geared/more usuable on track, at expense of "doesn't matter top speed" of course .

[nikitopo]

Yes, not much of big issue related with the closed gear ratio. With stock you might lose some tenths of second in 2nd gear, because you'll rev from 4500 RPM instead of 5300 RPM. It doesn't matter for me.

[FRS Justin]

Originally Posted by Teseo

Did you did crawford BPB?

Crawford power blocks smh