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Old 03-28-2014, 08:33 PM   #1
polaks
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Default Power Mods

I just sold my 96 v3 sti and am looking for another gc8 sti but at the same time I am planning how to get more power out of it... so far what I have found out researching is that injectors are limited to 15.5 psi, stock boost is at 14.7. What it seems like most people are doing is injectors, fuel pump, ecu, ebc, tuned on 91 octane fuel with 18psi there hitting around 340hp to the crank...

This is what my plan is, I plan on getting another sti with the ej20k and doing injectors, fuel pump, ecu, ebc, and on top of that a meth kit. I would like to get it tuned for 94 octane, with the meth injection and around 20 psi to hopefully hit around 380-400 hp. Does this sound like itll work or do I need more supporting mods to hit around 380-400hp at the crank??

I also read that the stock maf is limited to around 18-19 psi so would I need to add a new maf to my mod list?? Also I plan on keeping everything else stock like air intake and exhaust and what not unless those need to be upgraded for 380-400hp

Thanks a lot guys
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Old 03-29-2014, 10:59 AM   #2
pmugabi
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The Ej20k based cars have a MAF with a much higher limit, you won't need to change it. Injectors will need changing. Stock BCS will be fine too.

MAP sensor is limited to 1.5 bar so will be fine at 20psi. The most important thing to do will be to rebuild the engine first. An ancient engine will not respond well to outrageous levels of power.
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Old 03-29-2014, 12:59 PM   #3
Marnix
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Especially an engine as fragile as the EJ20K.... Replace the rods before you increase power/revs.
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Old 04-02-2014, 11:42 AM   #4
rob
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Quote:
Originally Posted by polaks View Post
I just sold my 96 v3 sti and am looking for another gc8 sti ...
Just to keep things clear, MY96 sti was a Ver2. MY97 was Ver3, My98 was Ver4. You are mixing model year with production dates. For whatever reason, this seems to be a common confusion with the importers in Canada.

-Rob
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Old 04-03-2014, 07:06 PM   #5
polaks
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V2 is Ej20g, mine was definitely v3 Ej20k Gc8d
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Old 04-04-2014, 12:09 AM   #6
rob
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Quote:
Originally Posted by polaks View Post
V2 is Ej20g, mine was definitely v3 Ej20k Gc8d
Sure and in that case it was definitely a 1997 model year, not a '96
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Old 04-04-2014, 02:51 AM   #7
AgentJ17
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very eg33 such braap

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We import them 15 years after the manufacture date and register them as such. So model year should be of little concern when discussing imported cars. Well, up here at least. Rob is correct.

But yeah, a lot more power than stock and you should start worry about the bottom end.
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Old 04-04-2014, 04:56 PM   #8
rob
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Ah, so you import a '97STi and register it as a '96. That explains why you guys are so confused

-Rob
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Old 04-05-2014, 06:44 AM   #9
69subaru360
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You are in Canada, why not just get a version 6 sti or a type r or ra? You guys can have the best of the GC chassis now.
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Old 04-05-2014, 01:46 PM   #10
Adverse
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can get a v5 not a v6 till the end of the year up here
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Old 04-05-2014, 02:53 PM   #11
AgentJ17
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very eg33 such braap

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Whatever. Get the V5. Not too different.
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Old 05-22-2017, 10:12 PM   #12
Blobtrejo
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Do you know what high performance injectors fit the 98 v4 sti ??🤔
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Old 05-26-2017, 06:31 PM   #13
binny
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Top feed conversion is probably your best option as there's a bunch more injector options compared to side feeds

Sard do a 800cc side feed if you can find them
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Old 06-05-2017, 02:18 PM   #14
Poppie
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Quote:
Originally Posted by Blobtrejo View Post
Do you know what high performance injectors fit the 98 v4 sti ??🤔
Get a set of Phase 2 440cc injectors,flow match them and get a set of adaptors so they fit.
UK company but you get the idea
http://lateralperformance.co.uk/prod...5689dd754d85bd

http://lateralperformance.co.uk/prod..._93__98__rails


As for the OP engine wise have a look at buying a Newage block unless you can or will be rebuilding the old engine yourself
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Old 06-06-2017, 12:23 AM   #15
i10scooby
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Rob now offers adapters to adapt Phase 2 side feeds to Phase 1 rails!

http://www.robtune.com/index.php/blog/item/8-adapters

Shout out to Rob... will these adapters work for EJ20K rails???
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