most HP out of 08 without turbo mods

calisti52 · 04-13-2008, 02:39 PM

what is the most WHP I can obtain by AP, headers, exhaust, uppipe, etc...? without modifying the turbo. I'm talking about getting around 310-320whp on stock turbo. would I need a front mount intercooler? I am looking to make a VERY reliable daily driver/track car that I can work hard and push it through the paces without jeopardizing reliability.

thanks =)

paikman · 04-13-2008, 02:42 PM

Quote:

Originally Posted by calisti52

what is the most WHP I can obtain by AP, headers, exhaust, uppipe, etc...? without modifying the turbo. I'm talking about getting around 310-320whp on stock turbo. would I need a front mount intercooler? I am looking to make a VERY reliable daily driver/track car that I can work hard and push it through the paces without jeopardizing reliability.

thanks =)

^ Those basic bolt on mods, a proper tune, and with 93 oct and up should net you approx 300-330whp and 400 ish wheel torque depending which dyno you use.

Brand · 04-13-2008, 03:48 PM

Don't waste money on headers for 320whp. Uppipe, downpipe. I don't think you'd need an FMIC, but if you've got the cash it couldn't hurt. The stock TMIC is pretty large, bet you could sell it for a good bit of money if you take it off. What octane is available in Poland? Do you have ethanol or anything like E-85 in the US? In the Denver area (1.75km elevation), an E-85 tune can yield a 20-30whp gain. I bet the 08 could do it on the stock fuel pump and injectors, but I don't know for sure. If you carry your AP around you can swap to a different octane map if no local place has ethanol.

paikman · 04-13-2008, 03:50 PM

Yeah might not need headers. I would get Methanol 50-50 Injection personally lol to go along with that.

***Szumita*** · 04-13-2008, 03:51 PM

you will get there.

im at 302/340 in my 06 without header or meth.

sutter2k · 04-13-2008, 07:16 PM

I know EWG is somewhat costly, but I still think it may be worth it.

my recommended recipe ===>
EWG($$, but faster boost, and more HP) plumbed back into dp, meth, catless DP(stock catback), cai intake, tune

Rootus · 04-13-2008, 07:22 PM

Quote:

Originally Posted by Brand

Don't waste money on headers for 320whp.

A header has about the same bang/buck ratio as stage 2 does. I wouldn't skip it.

JuggernautTCW · 04-14-2008, 04:29 AM

how much does headers help anyway?... i thought the gain is only like 10-15 hp on high rpm (4500+ rpm)?

Boostpimp · 04-14-2008, 04:35 AM

Headers can yield as much as 18 whp with proper tuning but can be more trouble than they are worth.

sutter2k · 04-14-2008, 05:58 AM

Quote:

Originally Posted by Boostpimp

Headers can yield as much as 18 whp with proper tuning but can be more trouble than they are worth.

An he did state "without jeopardizing reliability".
Just stay with ported stockers with cross pipe

chmura · 04-14-2008, 06:09 AM

Are you in Cali or are you living in Poland?

pisymbol · 04-14-2008, 07:20 AM

I have the exact same question and want the exact same thing: A really reliable stage 2 that nets me about 300whp+ with a tune. I've thought about everything on this list except a FMIC (not really good for crash safety from what I understand) and METH (don't really know a lot about this mod, anyone want to share their experiences, please do).

Rootus · 04-14-2008, 07:50 AM

Quote:

Originally Posted by JuggernautTCW

how much does headers help anyway?... i thought the gain is only like 10-15 hp on high rpm (4500+ rpm)?

The biggest gain with a header is through the midrange, where you can gain 25-30 ft-lbs of torque. Peak numbers are for magazines, what really matters is area under the curve.

Quote:

An he did state "without jeopardizing reliability".
Just stay with ported stockers with cross pipe

Many people run aftermarket headers without any reliability problems at all (just don't buy APS

). If ultimate reliability is your concern, don't mod the car at all.

The ported stockers work okay, they have a similar bang/buck ratio as a real header -- that is, they cost half as much, and you gain half as much.

JuggernautTCW · 04-14-2008, 09:20 AM

what does porting the headers involve and why does it help??... (im not sure what porting means)

pisymbol · 04-14-2008, 10:05 AM

Quote:

Originally Posted by JuggernautTCW

what does porting the headers involve and why does it help??... (im not sure what porting means)

Porting is typically to help air flow. Usually when people say porting or polishing I think of a process in which the metal gets sanded down to improve airflow.

This is a way better article on it:

Cylinder head porting - Wikipedia, the free encyclopedia

04-13-2008, 02:39 PM	#1
calisti52 Amateur STI Driver Car: 2008 Lexus ISF Fav Mod: APS TURBO Location: krakow, POLAND Posts: 11 Join Date: Jun 2006 Trader Rating: (0)	most HP out of 08 without turbo mods what is the most WHP I can obtain by AP, headers, exhaust, uppipe, etc...? without modifying the turbo. I'm talking about getting around 310-320whp on stock turbo. would I need a front mount intercooler? I am looking to make a VERY reliable daily driver/track car that I can work hard and push it through the paces without jeopardizing reliability. thanks =) This ad is not endorsed by this member. Please register or login to hide this ad.

04-13-2008, 03:48 PM	#3
Brand STI Driver Car: DGM 08 STI Fav Mod: cobb AP Location: Denver Posts: 297 Join Date: Jan 2008 Trader Rating: (1)	Re: most HP out of 08 without turbo mods Don't waste money on headers for 320whp. Uppipe, downpipe. I don't think you'd need an FMIC, but if you've got the cash it couldn't hurt. The stock TMIC is pretty large, bet you could sell it for a good bit of money if you take it off. What octane is available in Poland? Do you have ethanol or anything like E-85 in the US? In the Denver area (1.75km elevation), an E-85 tune can yield a 20-30whp gain. I bet the 08 could do it on the stock fuel pump and injectors, but I don't know for sure. If you carry your AP around you can swap to a different octane map if no local place has ethanol.

04-13-2008, 03:50 PM	#4
paikman Grassroots STI Racer Car: 2008 OBP STi Fav Mod: Advan RS 18x9. TurboXS downpipe. Location: VA Posts: 529 Join Date: Jan 2008 Trader Rating: (0)	Re: most HP out of 08 without turbo mods Yeah might not need headers. I would get Methanol 50-50 Injection personally lol to go along with that.

04-13-2008, 03:51 PM	#5
*Szumita* i eat cones Car: 06 sti - steel gray Fav Mod: catless Location: ma & ri Posts: 6,099 Join Date: Oct 2006 Trader Rating: (10)	Re: most HP out of 08 without turbo mods you will get there. im at 302/340 in my 06 without header or meth.

04-13-2008, 07:16 PM	#6
sutter2k STI Driver Car: 05 Legacy w/sti mani Fav Mod: KW coilovers Location: Willow Grove PA Posts: 208 Join Date: Dec 2005 Trader Rating: (0)	Re: most HP out of 08 without turbo mods I know EWG is somewhat costly, but I still think it may be worth it. my recommended recipe ===> EWG($$, but faster boost, and more HP) plumbed back into dp, meth, catless DP(stock catback), cai intake, tune

04-14-2008, 04:29 AM	#8
JuggernautTCW Senior STI Driver Car: Silver 05 WRX Sedan Fav Mod: Stage 2 w/ Uppipe Location: Newton, MA Posts: 308 Join Date: Dec 2007 Trader Rating: (0)	Re: most HP out of 08 without turbo mods how much does headers help anyway?... i thought the gain is only like 10-15 hp on high rpm (4500+ rpm)?

04-14-2008, 04:35 AM	#9
Boostpimp Grassroots STI Racer Car: 04 WRB/G STi Fav Mod: Sz49 + Meth Location: South Carolina Posts: 533 Join Date: Jun 2004 Trader Rating: (2)	Re: most HP out of 08 without turbo mods Headers can yield as much as 18 whp with proper tuning but can be more trouble than they are worth.

04-14-2008, 06:09 AM	#11
chmura STI Driver Car: 07 Lexus IS250 Fav Mod: Future 09 STI Owner :) Location: Orange County, CA Posts: 206 Join Date: Dec 2007 Trader Rating: (0)	Re: most HP out of 08 without turbo mods Are you in Cali or are you living in Poland?

04-14-2008, 07:20 AM	#12
pisymbol Junior STI Driver Car: WRB 08 WRX STI Fav Mod: Coming Soon Posts: 172 Join Date: Feb 2008 Trader Rating: (0)	Re: most HP out of 08 without turbo mods I have the exact same question and want the exact same thing: A really reliable stage 2 that nets me about 300whp+ with a tune. I've thought about everything on this list except a FMIC (not really good for crash safety from what I understand) and METH (don't really know a lot about this mod, anyone want to share their experiences, please do).

04-14-2008, 09:20 AM	#14
JuggernautTCW Senior STI Driver Car: Silver 05 WRX Sedan Fav Mod: Stage 2 w/ Uppipe Location: Newton, MA Posts: 308 Join Date: Dec 2007 Trader Rating: (0)	Re: most HP out of 08 without turbo mods what does porting the headers involve and why does it help??... (im not sure what porting means)