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Old 09-08-2019, 01:18 AM   #1
LG9892
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Default Ideal HP for winding roads/back roads?

Ive seen alot of subies that have tremendous power like 500+ whp and above,Id like to work on one myself but at my place theres isnt much of expressways or roads thats okay to do some pulls, ive been thinking to upgrade my car's(16' STI) capabilities on winding roads and make it around 350+ CHP. The question is how much horsepower should i make and where should i start with? I really need help with a complete setup for this. I heard alot of things about cosworth 2.6 stroker kit and upgraded turbo/tmic/intake/equal lenght headers/1050cc fuel injectors. In short, i wanted a guide for Reliable Power setup for my subaru.Thanks
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Old 09-08-2019, 02:05 AM   #2
the_saintusa
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Is your stock output not enough?

How fast do you want to be going on the street?

For the road 300 hp at the wheels is plenty.
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Old 09-08-2019, 03:02 AM   #3
LG9892
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Originally Posted by the_saintusa View Post
Is your stock output not enough?

How fast do you want to be going on the street?

For the road 300 hp at the wheels is plenty.
For me its not enough i feel like theres more room for improvement ive used all its power and ended up unsatisfied with just stock power
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Old 09-08-2019, 02:39 PM   #4
the_saintusa
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Originally Posted by LG9892 View Post
For me its not enough i feel like theres more room for improvement ive used all its power and ended up unsatisfied with just stock power
I attacked the suspension in my 04 STi before adding significantly to the engine.

KW v3 variant coilovers
24 mm F/R swaybars
Anti-lift kit
Upgraded bushings
Stickier tires
Upgraded brake pads
Brake fluid

The car can corner faster and smoother than 99.9% of people would feel comfortable driving. Being able to increase the entry speed into a corner (increasing your exit speed) allowed me to be faster, much faster.

After all of that I started to increase the power output. Adding power only allowed me to slide through corners (if you wanted to), and pull harder out of corners, but usually ran out of room as the entry speeds got higher without making the car faster.
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Old 09-09-2019, 03:09 PM   #5
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Quote:
Originally Posted by LG9892 View Post
For me its not enough i feel like theres more room for improvement ive used all its power and ended up unsatisfied with just stock power
I cant even use all the power on my 1999 outback N/A with heavy suspension modification without seriously massively breaking local traffic laws on the tightest of roads around new england.

How are you using all the power in a WRX on the STREET.

Take your car to an autocross event or an HPDE event. The last thing you need is more power, based on the sheer existence of this thread.
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Old 09-24-2019, 02:51 PM   #6
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Quote:
Originally Posted by LG9892 View Post
For me its not enough i feel like theres more room for improvement ive used all its power and ended up unsatisfied with just stock power
You have never reached your cars potential, I can guarantee that. Learn to become a better driver first, your car will seem faster once you do.
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Old 09-24-2019, 04:41 PM   #7
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Originally Posted by Turpid Porpoise View Post
You have never reached your cars potential, I can guarantee that. Learn to become a better driver first, your car will seem faster once you do.
eh he will build his car and be dissapointed then sell it cause its wasnt what he wanted.
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Old 09-08-2019, 08:54 AM   #8
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If playing in the corners is the goal I wouldn't even go so far to build a motor, would aim for 300-350whp ish and call it a day. Save the money for tires and handling bits. I can go significantly faster around a corner in my car then most Subaru's and it has VERY LITTLE to do with the 500whp the car has available to use.

That's my 2 cents.
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Old 09-08-2019, 09:26 AM   #9
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You can do 300-320 without changing any physical parts on the car, and thats plenty to rip around the twisties. Going fast through the woods is more about how to drive the car with the powerband it has, rather than worrying about how much power it makes. Learning to drive it through corners and managing its weight with a wide-useable powerband will make you faster than other cars with more power, depending on the car id say its takes another 200+ hp to make up for being slow in corners.

You can buy tons of **** for your car to make 350+ whp but a BRZ will throw you a beating in the corners, spend your money on quality suspension components and the rest of your money learning to use those components as well as possible.
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Old 09-08-2019, 02:28 PM   #10
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I feel like my stage 2 WRX is too fast for flooring it and going to redline on anything but a highway.
Redline in 3rd gear is around 90mph..
So I can go redline in 1st and 2nd around town. Not exactly taking advantage of all the car has to offer.
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Old 09-08-2019, 04:51 PM   #11
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I used to lust for more power, to the point that I was going to go American muscle from my 2016 WRX. Yes, high horsepower/tq makes a much faster from stop light to stop light car and maybe if you winding roads have lots straights, But I felt like I could not really get on the HP, it was just not safe feeling.

I feel like the stock HP in the WRX/STI is perfect for a street car, I can get on the throttle and still have fun. I feel like I can actually push the car. The magic is the manual transmission, steering, planted feel, and being able to rev out the engine without flying off the road or going to jail. To me this is what makes these cars fun on winding roads and think these already have ideal HP.

If you are going to go for more power, I'd start small (stage 1 or 2) and see if that addresses your need for more HP.

Last edited by CoronaWRX; 09-08-2019 at 06:15 PM.
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Old 09-08-2019, 06:07 PM   #12
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About 700whp
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Old 09-08-2019, 08:05 PM   #13
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Originally Posted by user1029 View Post
About 700whp
yeah if you want to kill yourself

I agree 300 is way more than enough for windy roads. learn how to driver first then upgrade suspension. I have a 400 whp wrx and I cant even go 50% throttle in windy roads. but i have a little MR2 that has gearing and all and it way more fun for that type of stuff

BTW how fast are you going on these windy roads? if yo cant answer this question, you should really pay attention. even if you increase your entry speed like 3 MPH and are able to hold that on the exit you are going to be significantly faster than most people. doesnt take much .. just saying its not about power

Last edited by subaru_gc8; 09-08-2019 at 08:11 PM.
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Old 09-09-2019, 01:51 AM   #14
LG9892
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Originally Posted by subaru_gc8 View Post
yeah if you want to kill yourself

I agree 300 is way more than enough for windy roads. learn how to driver first then upgrade suspension. I have a 400 whp wrx and I cant even go 50% throttle in windy roads. but i have a little MR2 that has gearing and all and it way more fun for that type of stuff

BTW how fast are you going on these windy roads? if yo cant answer this question, you should really pay attention. even if you increase your entry speed like 3 MPH and are able to hold that on the exit you are going to be significantly faster than most people. doesnt take much .. just saying its not about power
I can go about 45mph tops on corners.On average speed i can go about 90-110 most of the time
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Old 09-10-2019, 02:30 AM   #15
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Quote:
Originally Posted by LG9892 View Post
I can go about 45mph tops on corners.On average speed i can go about 90-110 most of the time
where are these roads? it sounds like there are lots of straights and not much twisties.. you do realize that is faster average speed than 90% people go on race tracks.
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Old 09-09-2019, 01:52 AM   #16
LG9892
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yeah if you want to kill yourself

I agree 300 is way more than enough for windy roads. learn how to driver first then upgrade suspension. I have a 400 whp wrx and I cant even go 50% throttle in windy roads. but i have a little MR2 that has gearing and all and it way more fun for that type of stuff

BTW how fast are you going on these windy roads? if yo cant answer this question, you should really pay attention. even if you increase your entry speed like 3 MPH and are able to hold that on the exit you are going to be significantly faster than most people. doesnt take much .. just saying its not about power
But something always bother me when i drive it on that road.It kinda lacks something that i cant figure it out but my thoughts going for powerloss
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Old 09-09-2019, 04:33 PM   #17
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But something always bother me when i drive it on that road.It kinda lacks something that i cant figure it out but my thoughts going for powerloss
what the problem is is you dont know how to drive you car. for instance, when you drive a turbo car especially a subaru, you have to stay on the gas around the corners to make sure you dont fall out of boost. its a little crazy at first but when you start to understand it it makes alot of sense. the reason why we are all wheel drive and turbo is so we can stay on the gas to maximize traction and still keep the turbo spooled. that why I was saying you should go to track days and such to see how your car will handle and you get more confidence. plus if you build your engine, your power range is going to shift to the left and you will have to push harder to get the power out of your car if that makes sense.
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Old 09-09-2019, 08:00 PM   #18
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In all honesty.. rather than spending an obscene amount on a 500+ whp stroker build for your street car..

You would be better off spending that money on a cheap NA Miata or used BRZ. A lightweight, low hp, RWD car will be more fun and feel faster around your winding back roads than a heavy, turbo, AWD car. You'll be able to go WOT and shift gears to your heart's desire without obliterating the legal speed limit. The whole "drive a slow car fast" thing is real. You'll learn how to drive a momentum car fast and maintain speed through corners. It will be infinitely more fun for that type of driving for significantly less money. MOST importantly, it will make you a better driver. This will help you push your stock STI further.

That's not to say that the STI isn't fun to drive, fast or good handling. It's all of those things. It just has plenty of power and is extremely capable with its AWD system. You won't be able to exploit its potential on public roads and it will mask your driving errors. It's much harder to improve your driving this way.

At the very least, go test drive a new Miata around these same back roads with the top down. Then come back and tell us that you still need 350+ whp to have fun and go faster around the curves.

I honestly used to laugh at the thought of a Miata.. especially when I had my FD Rx-7. But as I've matured I completely understand the appeal of a low power, lightweight roadster. I'll likely add a NA or ND Miata to my garage someday (as a 2nd car).
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Old 09-10-2019, 11:48 AM   #19
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But something always bother me when i drive it on that road.It kinda lacks something that i cant figure it out but my thoughts going for powerloss
Not to be disrespectful, but have you gone to any kind of performance driving training? whether it be a school, track day or autocross? Go to a local autocross, have someone codrive with you and show you how fast your car already is. Afterwards if you still think you need it, I'd look at tires, suspension, and a performance brake pad in that order before anything else. If you add a bunch of HP without doing those you'll likely get yourself in trouble. Been there done that.

If you still want 350whp on a mustang dyno you can do it on a stock engine but you will need injectors, fuel pump, intercooler upgrade, step colder plugs, bolt in turbo (blouch 2.5 or something similar), up pipe, down pipe and a professional tune on your accessport at a minimum. With a stock engine you will make the HP but it's life will be shortened; a good tuner and being able to keep the charge air cool (boost <20psi and quality intercooler) will help extend that life. When, not if, you blow it up forged rods and pistons and maybe ARP headstuds will be all you'll need longblock wise for that power level.

After that, welcome to the world of built engines and all that comes with it. Good luck.
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Old 09-12-2019, 03:06 PM   #20
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Originally Posted by subaru_gc8 View Post
yeah if you want to kill yourself

I agree 300 is way more than enough for windy roads. learn how to driver first then upgrade suspension. I have a 400 whp wrx and I cant even go 50% throttle in windy roads. but i have a little MR2 that has gearing and all and it way more fun for that type of stuff

BTW how fast are you going on these windy roads? if yo cant answer this question, you should really pay attention. even if you increase your entry speed like 3 MPH and are able to hold that on the exit you are going to be significantly faster than most people. doesnt take much .. just saying its not about power

your missing the point dude. he needs 700whp.
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Old 09-15-2019, 06:30 AM   #21
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your missing the point dude. he needs 700whp.
did you see he averages 100 mph on these roads.. thats faster than the wrc guys go
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Old 09-15-2019, 05:16 PM   #22
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did you see he averages 100 mph on these roads.. thats faster than the wrc guys go

I should be averaging 120mph on residential backroads
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Old 09-08-2019, 10:03 PM   #23
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Old 09-09-2019, 08:13 AM   #24
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oh boy


this thread just reeks of noob

first off to answer the thread title in a sarcastic way .... all of it

in response to the first post & let me get this straight ..........you need an eleventy billion hp stroker motor to go faster through corners ?

my sti is much lighter than yours and makes 450-500 , the difference in lap times around a few different road course race tracks (not the street racing fast and furry balls kiddie car course from the sonic drive in to the vape shop , a real race track) with my current power levels and my old stg 2 setup is not very much at all


I often say to people at the track that tell me they want to go faster ........... you just need to figure out how to not slow down

may I suggest you go to some hpde events and get all the instruction and seat time seat time seat time that you can ?

you may find it very rewarding
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Old 09-09-2019, 02:55 PM   #25
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may I suggest you go to some hpde events and get all the instruction and seat time seat time seat time that you can ?

you may find it very rewarding
By far the best advice in this thread and the best use of money. Learn how to use your car's potential to go faster through the turns. The STI's AWD system is great for getting novices through corners quickly. Unfortunately, it also "inspires [false] confidence" making people think that they're better drivers than they actually are. It helps mask bad driving habits and prevents drivers from learning how to improve their driving skills. Needless to say, you shouldn't be exceeding speed limits on public winding roads for the safety of others..

While your thread's title says "winding roads", it sounds like you're fine with the 45 mph through the curves, but want a car that's faster on the straights. In that case, it sounds like a Mustang GT should be in your future You can reliably make more horsepower for less money.

Again, shouldn't be going 110 mph on public roads for the safety of others... Even the best driver's can't safely use the full potential of a stock STI on a public road.
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