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Old 03-12-2009, 12:01 PM   #1
centeno711
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Default building motor now what turbo

so im just gonna build the 205 since im poor. gonna go through the bottom and do forged pistons rods.....you get the idea.

gonna go with a top mount sti intercooler i imagine but my question is if i only want 300 horse what turbo should i run and what injector.

i know everyone says ask your tuner....i dont have one sooooo another question is should i go with a higher compression piston on the 205? and then i could run lower boost. what are the advantages and draw backs of this. i know this will change quench but there has to be some give and take. i like the revier feel of a higher compression turbo motor.

also is it better to have a bigger turbo than necessary or is it really critical to hit it right in the sweet spot of its efficiency?

interested what you guys will have to say.
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Old 03-12-2009, 12:18 PM   #2
AWDWRXLOVER
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300 hp built motor wrx is waste of money.
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Old 03-12-2009, 01:15 PM   #3
EGY5
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you don't need a built motor for 300whp.

you need a fuel pump, injectors, and a vf39/evoIII16G and a TBE.

you'll wont come close to the limits of the motor @ 300whp. If your motor is old, then you are better off building a 257 when it craps out.
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Old 03-12-2009, 01:20 PM   #4
seanathanq83
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dude put a 20g on it, and make a good powerband, you will be able to get 350whp and should have a nice DD
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Old 03-12-2009, 01:25 PM   #5
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I'd almost venture to say that if you are building it, toss some more compression at it (how much depends on fuel and alky) and put a slightly big a/r GT28 or maybe even a 30r if you want to use the high rpm capability of a 2 liter (going from 3.9 to 4.44 gears will blow your mind)...if you want a torquey EJ20 build stick with a smaller turbo.
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Old 03-12-2009, 07:07 PM   #6
centeno711
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uhh lots of good advise but motor is on my floor in pieces. and i have a 5mt that i cant swap right nowso i wanna build what i can handle today and be ready for a new tranny
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Old 03-12-2009, 11:51 PM   #7
centeno711
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sorry last post was so short i was at work. what im saying is i dont have money to do the tranny yet so in the mean time what will be a good spooling turbo for 300 hp. when i do the tranny i will retune and do a new turbo and injectors.

if that makes any sense and since i spun a bearing i cant just run the 205 till it drops cause it already dropped sooooooo whats the cheapest best turbo for 300 hp is my question

thanks for opinions

also homemade im thinking like 9:1.

i was gonna run one of your longrod setups but i never got a price from you.....and i got tired of never finding ej257 block halves on the west coast.
whats the deal with the east coast always having blocks for sale and here there never are?
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Old 03-12-2009, 11:54 PM   #8
seanathanq83
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wow 9:1 thanks kinda high i was thinkgin 8.7 or so. i still say 20g its a good turbo, and as long as you keep the boost to around 18-20 you should be able to get your 300, and when you get your new tranny just turn up the boost and get 350+

im in the same boat, im building my v8 207, and will be sticking a vf37 with a 20g wheel and complete jdm exhaust on, , but will keep the boost turned down so i dont blow up the 205, then when i put in the new motor i will sell the 205, and buy my 6 speed
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Old 03-13-2009, 01:17 AM   #9
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Get something small like an 18G or 20G, maybe a bolt on 30R. 9:1 is a pretty decent bump in compression but I think it would be fun on the street with E85 or meth.

What internals you plan on using?
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Old 03-13-2009, 10:00 AM   #10
centeno711
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good question
im picking up $1000.00 bucks today for a side job i did and im wondering which to get first i already have a crank revised version. is there someone out there that already makes this piston"off the shelf" that i could call? also gotta get the machine work done but i figured i could get rods and pistons then go have the hone done.

another question i had is if im going higher compression would iit make any difference to do a little overbore? or is it a waste of money

also would the 20g be a lag pig? it seems like a large turbo for 300 horse
or would the bump in compression offset that a little
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Old 03-13-2009, 12:26 PM   #11
ScorpionT
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You wont get more than 8.5:1 compressions off the shelf, so either use those or get a custom set made Doing a little overbore wouldnt hurt any IMO. The 20G wouldnt be terrible, but thats why I also suggested the 18G.
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Old 03-13-2009, 03:03 PM   #12
seanathanq83
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if you get a td05 7cm it will be the same as an 18g, but i recomend either a 7cm td06, aor a td05 8cm, so you will get a little better top end. also if you want higher than 8.5, get your deck surfaced a little, and a thinner head gasket, but watch how much you go because to much and valves will hit. personaly i think a thiner headgasket, .4 would get you around 8.6 maybe 8.7, but CP makes custom pistons and they are pretty much the same price as their OTS pistons. and if you get the 20g, you might have some lag, but i have seen them spool as soon as ~3500rpms, and thats on 8:1 compression, with higher compression it will really up the ability to spool the turbo, and make off boost better, so it will also make it a smoother transition
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Old 03-13-2009, 07:20 PM   #13
Fongers
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18g with 8.5+ compression and you should be good. Consider an OEM 2.5 block if you don't wanna break 320 to save some money over building.
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Old 03-14-2009, 02:25 AM   #14
centeno711
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the only problem i have with the oem ej257 is im gonna have to do pistons because ive seen too many cracked ringlands to feel comfortable. also correct me if im wrong but the 205 is a more efficient engine producing higher mileage results. ok ok i know you dont turn up a motor for the mpg rating but its still nice to get decent mileage
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