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Old 03-05-2013, 11:22 AM   #1051
BlockBlockBlockBlock
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As a non-car enthusiast, I really appreciate the ample reading material here on behalf of OP and I'd to add "Because Racecar"
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Old 03-07-2013, 02:25 AM   #1052
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What kind of gas mileage does a heavily built or fully built STi get, ballpark? Is there an "economy" tune to switch over to when wanting to save on gas and keep her running a little slower?
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Old 03-07-2013, 02:51 AM   #1053
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Quote:
Originally Posted by DoomsdayFAN View Post
What kind of gas mileage does a heavily built or fully built STi get, ballpark? Is there an "economy" tune to switch over to when wanting to save on gas and keep her running a little slower?
You don't buy these cars if your worried about spending money on gas. I was getting about 16mpg on E85 with my WRX in mixed driving. Slightly higher running 91. The worse I ever got was 4mpg while canyon carving. You can switch maps to be more economical, but it's not going to be a huge improvement. The best way to save gas is to stay out of boost.
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Old 03-07-2013, 09:01 PM   #1054
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Quote:
Originally Posted by rexblake View Post
You don't buy these cars if your worried about spending money on gas. I was getting about 16mpg on E85 with my WRX in mixed driving. Slightly higher running 91. The worse I ever got was 4mpg while canyon carving. You can switch maps to be more economical, but it's not going to be a huge improvement. The best way to save gas is to stay out of boost.
I hear you for sure, and I've already made up my mind about the STi. It's just, I'd like to know what kinda gas mileage I'm looking at with a modded engine. My first goal is to go COBB Stage 2. Hopefully that doesn't destroy the gas mileage. Then from there just do more and more stuff over time.

The STi will be my play car, but it'll also be my daily driver. So, I gotta kinda keep gas in mind a little bit.

On a DD basis though, staying out of boost wont be a problem. I'll drive like a grandma going to and from work/school/store. I mean, granted, I'll punch probably at least once a day, but I'm usually really good about that sorta thing.
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Old 03-07-2013, 09:08 PM   #1055
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Quote:
Originally Posted by DoomsdayFAN View Post
What kind of gas mileage does a heavily built or fully built STi get, ballpark? Is there an "economy" tune to switch over to when wanting to save on gas and keep her running a little slower?
I can't speak for a fully built STi specifically; however, I can say that a fully built WRX WITH the STi guts (minus the ECU and AVCS) gets about 25mpg MAX...flat road, highway/freeway, straight, no traffic, at sea level, and very little added weight. City...yeah...it tanks...heavy foot =15mpg; light foot =17-18mpg. (...I also have the JDM 6spd...so 5th and 6th are a bit closer, so that will affect MPG some; +/- 1-2mpg)

*That is for a 16bit ECU (02-05 WRX), with the whole STi shebang..again minus the ECU and AVCS.
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Old 03-07-2013, 09:30 PM   #1056
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Quote:
Originally Posted by DDScooby View Post

I can't speak for a fully built STi specifically; however, I can say that a fully built WRX WITH the STi guts (minus the ECU and AVCS) gets about 25mpg MAX...flat road, highway/freeway, straight, no traffic, at sea level, and very little added weight. City...yeah...it tanks...heavy foot =15mpg; light foot =17-18mpg. (...I also have the JDM 6spd...so 5th and 6th are a bit closer, so that will affect MPG some; +/- 1-2mpg)

*That is for a 16bit ECU (02-05 WRX), with the whole STi shebang..again minus the ECU and AVCS.
Define fully built?
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Old 03-07-2013, 10:23 PM   #1057
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^basically nothing left of the OEM long block except the casings, otherwise completely forged/performance aftermarket internal bottom and upper halves. ...also includes air and fueling.
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Old 03-07-2013, 10:31 PM   #1058
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Quote:
Originally Posted by DDScooby View Post
^basically nothing left of the OEM long block except the casings, otherwise completely forged/performance aftermarket internal bottom and upper halves. ...also includes air and fueling.
You have given me hope.
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Old 03-08-2013, 03:25 AM   #1059
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This post is a great point. I think that people really need to see what happens with a crash at 100+mph before they go trying to hit 100+mph. There is a U.K. tv show called "Fifth Gear" that does a 120mph crash test with a stock Ford Focus, and the results are quite bone chilling. I recommend looking it up if you're not squeamish to crash test dummies being slaughtered. Youtube search "120mph crash test" and it should pop on there.
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Old 03-08-2013, 06:02 PM   #1060
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Update: 420/380 on 26psi tune. Ragging on my car pretty hard to see what pops this stock motor. No breakage yet after 12k miles daily driven. Full boost several times a day, 1/8 runs, 1/4 runs, highway pulls, thrown several codes sorting out minor issues, and driven in all conditions including crushed gravel daily.

Even hammered it for a few miles to see how high my EGT would get. Pegged to 1800F with no ill effects, usually pulls got to 1600-1700 in a second or two then flatlined. Should really drop off the spare motor to the machinist so its ready when I succeed
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Old 03-09-2013, 12:07 PM   #1061
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Quote:
Originally Posted by imma_stocker View Post
Update: 420/380 on 26psi tune. Ragging on my car pretty hard to see what pops this stock motor. No breakage yet after 12k miles daily driven. Full boost several times a day, 1/8 runs, 1/4 runs, highway pulls, thrown several codes sorting out minor issues, and driven in all conditions including crushed gravel daily.

Even hammered it for a few miles to see how high my EGT would get. Pegged to 1800F with no ill effects, usually pulls got to 1600-1700 in a second or two then flatlined. Should really drop off the spare motor to the machinist so its ready when I succeed
Maybe you just have one of those magicscoobs 0.0
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Old 03-19-2013, 12:05 PM   #1062
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I've been debating about buying an sti and i stumbled across this post and i just want to say that the man that made this post is a brilliant brilliant man.
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Old 03-19-2013, 12:19 PM   #1063
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I have a 97 impreza outback. How make 400 hp?
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Old 03-19-2013, 01:44 PM   #1064
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Originally Posted by BlockBlockBlockBlock View Post
I have a 97 impreza outback. How make 400 hp?
Easiest and fastest way? Sell it and buy a cammed vette, f-body, GTO, V8 truck, mustang, etc.
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Old 03-19-2013, 01:54 PM   #1065
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Easiest and fastest way? Sell it and buy a cammed vette, f-body, GTO, V8 truck, mustang, etc.
But I want to sleep people with my 97 outback. Should I add more stickers?
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Old 03-19-2013, 09:52 PM   #1066
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Quote:
Originally Posted by DoomsdayFAN View Post
What kind of gas mileage does a heavily built or fully built STi get, ballpark? Is there an "economy" tune to switch over to when wanting to save on gas and keep her running a little slower?
I am not quite 400HP (390HP on Cobbs Mustang Dyno) but close enough lol

I get 14/21 and that is with 272 cams, GTX30, 91oct, full catless exh, open loop idle, P&P, ID1000's, etc.

BTW - how can I load the specs of my motor, etc into my profile so I dont have to type them out all the time


**Should note that the 14/21 was achieved on my 'econ mode' which is 310/278 for power numbers, I dont have gas mileage numbers on the higher power modes yet.

Last edited by bizarro252; 03-19-2013 at 10:00 PM. Reason: Adding info
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Old 03-21-2013, 04:02 PM   #1067
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My friend's 06 STI made 387whp on a dynopack and got about 17mpg mixed.

As far as the power level it was fast but it wasn't uncontrollable like some of the posts here say. Wasn't very hard to drive at all when I drove it. My 330whp Spec V was harder to drive with all the torque steer but even that wasn't that hard to drive.

Then again I've been to the strip many times and autocross my car a decent amount.
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Old 03-21-2013, 06:47 PM   #1068
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Dave's point about the uncontrollable power is very valid. You have to understand that his point depends on the driver. A "green" driver won't have the same ability to control the pull 400awhp has. Plenty of totaled WRX and STI out there with stock power already. Now up the power, chop a couple seconds off the 1/4 times and you've got a recipe for the tree mod.

Still the same issue with experienced drivers but the driver mod is more important with more power.
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Old 04-14-2013, 03:12 PM   #1069
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i can relate to this for the longest time ive wanted close to 400 but after spending close to 10gs on a rebuilt 2.5 forged pistons and a lot of bolt ons the cost just adds up. so what ever my car makes ill be happy.
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Old 04-15-2013, 10:52 PM   #1070
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Originally Posted by Chrisjp011 View Post
i can relate to this for the longest time ive wanted close to 400 but after spending close to 10gs on a rebuilt 2.5 forged pistons and a lot of bolt ons the cost just adds up. so what ever my car makes ill be happy.
What's the car at now?
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Old 04-19-2013, 09:02 AM   #1071
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A 400 hp subaru engine will probably only last one week.
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Old 04-19-2013, 11:59 AM   #1072
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A 400 hp subaru engine will probably only last one week.
Oh you're right! Subaru must have outsourced 95% of their engines. The other 5% were reserved for jackasses who can't change oil or drive below redline.

Seriously man plenty of us pushing well over 400whp, more like 500hp at the crank. Another month gone by and no signs of this 80k mile oem longblock letting go. Still daily driven at 420/380 to the tires.
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Old 04-19-2013, 05:24 PM   #1073
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Originally Posted by imma_stocker View Post

Oh you're right! Subaru must have outsourced 95% of their engines. The other 5% were reserved for jackasses who can't change oil or drive below redline.

Seriously man plenty of us pushing well over 400whp, more like 500hp at the crank. Another month gone by and no signs of this 80k mile oem longblock letting go. Still daily driven at 420/380 to the tires.

Where the floam did that guy come from anyway
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Old 04-19-2013, 09:49 PM   #1074
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Where the floam did that guy come from anyway
Headuphisassylvania
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Old 04-29-2013, 11:57 PM   #1075
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Bumpvjb
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