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Old 12-07-2012, 11:39 AM   #1
Stangy
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Join Date: Aug 2012
Chapter/Region: E. Canada
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1999 GC8 R-STI
White

Default Robs Tune + Big Turbo?

Hey all. So I have the chance to grab a GT3076 or a GT30r bolt on turbo for my GC8- the only reason I am thinking about doing it is because the price is so S%###d cheap I cant pass it up. I currently running the following on a Robs 440 tune.

Version 2 STI swap (rebuilt 20,000km ago)
TD05H 16G
Robs 440 Tune @ 19psi (10.5AFR at WOT)
AEM Wideband AFR
AEM Boost Gauge
Hallmans MBC
APEXI Power Intake System
Cometic metal head gasket
ACL race bearings
ARP head studs
OEM replacement piston rings
OEM front and rear main seals
OEM camshaft seals,tensioner and pulleys
Bully stage 3, 6 puck Kevlar sprung clutch Bully stage 3 pressure plate
Syms headers
zero sports World Leaguer downpipe
Zero sports world Leaguer Cat back exhaust
poly urethane exhaust bushings
Greddy RS blow off valve

Suspension
Gab Damping adjustable coilovers with camber plates
Rear white line camber bolts
Rear cusco Strut bar
Front cusco Strut bar
Whiteline 22mm[/font][/color][/url][font=Verdana] rear Sway

Brakes
STI brembos up front w/hawk race pads
2.5rs set up in the rear w/hawk race pads

Other then 650-750cc injectors, and a new 255 fuel pump, does anybody see any issues with running say 20psi on the gt30 on Robs Tune. I know the tune is a basic reprogram meant for 92-94 octane. I assume the AFR with the larger injectors would still be safe 10.5-11.5 am am I way off?

Yes I know retune is highly recommended- I realize this, but I want to know if anybody else has tossed on a larger turbo then stock on a Robs 440 or 550 tune.

Thanks

Andrew
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Old 12-07-2012, 12:20 PM   #2
Cbgrandtheftauto
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'13 BRZ

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A 30R will max the 440's out really quick..don't do it!!

Get a standalone and injectors before throwing a 30r on it.
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Old 12-07-2012, 12:43 PM   #3
Stangy
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I have 650s laying around. If I tossed it on with big injectors and the afr was in the proper spot technically I should be fine....Maybe lol
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Old 12-07-2012, 02:22 PM   #4
azn0boi04
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97 OBS EJ20G ZILLA
87 GL

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need new tune from rob for the injectors. im sure it will work but u will not optimize your power.

but im running ej20g with wiseco piston and other related things
closed deck
fmic
td05 16g
550cc
grimmspeed mbc set to ~17psi
stock wrx/sti recirc.
other things

...with robs 550 chip. runs good its been running for about 10k miles..
still runnin, and is my daily.
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Old 12-07-2012, 02:48 PM   #5
Stangy
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Yea mine is a daily from April-November. She is getting a makeover this winter haha. What type of power are you putting down with your set up? I am running the 440 tune at 19-20psi on a tdo5h 16g.
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Old 12-09-2012, 02:47 AM   #6
azn0boi04
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87 GL

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Quote:
Originally Posted by Stangy View Post
Yea mine is a daily from April-November. She is getting a makeover this winter haha. What type of power are you putting down with your set up? I am running the 440 tune at 19-20psi on a tdo5h 16g.

actually have no real numbers to give. my guess would be a tad bit over 300 ~17psi

how are u hitting 19-20psi on rob tune, doesnt the maf max at 18psi.
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Old 12-10-2012, 10:53 AM   #7
Stangy
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Nope. I am on stock MAF and i am fine. My AFR is around 10.5 at WOT. No issues. Side Note: If my maf was maxed what symptoms would one see?
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Old 12-10-2012, 03:08 PM   #8
Marnix
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On stock rods and pistons, forget about it.
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Old 12-10-2012, 03:53 PM   #9
69subaru360
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No way, absolutely will not work.

You will max out the injectors and the maf.

If you get injectors and an aftermarket ecu with different or no maf then you will blow up the stock engine. The rods and pistons can not handle 30r power.
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Old 12-10-2012, 07:37 PM   #10
Stangy
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My internals are forged from factory. Again..I would go 650-700cc inj. To get around the maf issue (maxed out at 5.12v) I would simple run less boost. Or am I crazy lol
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Old 12-10-2012, 07:43 PM   #11
69subaru360
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Quote:
Originally Posted by Stangy View Post
My internals are forged from factory. Again..I would go 650-700cc inj. To get around the maf issue (maxed out at 5.12v) I would simple run less boost. Or am I crazy lol
You're crazy and you will blow it up.

You might have forged pistons, some EJ20G STI engines did. But you still have the same old crappy rods with the same old crappier rod bolts as any naturally aspirated subaru.

That ROM you are running is not tuned for a 30r. A 30R will move a crapton more air at lower boost than a 16G does. You can't just put bigger injectors in with no tuning, I shouldn't even have to explain why that's bad.

But hey do what you want, be sure to post back with a "I blew my **** up thread" for all our amusement.
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Old 12-10-2012, 07:52 PM   #12
eg33GC
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EJ20K RS

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a 3076 is like 15lb/min larger.

you should just stop while youre ahead
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Old 12-10-2012, 08:10 PM   #13
Stangy
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Lol fair enough! Also. The ej20 I have is semi closed deck, forged pistons, crank and rods from factory. When I tore it down I made sure to check. I first through the pistons were hypercast, turns out all were forged.
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Old 12-10-2012, 09:06 PM   #14
i_c_the_light
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Quote:
Originally Posted by Stangy
Lol fair enough! Also. The ej20 I have is semi closed deck, forged pistons, crank and rods from factory. When I tore it down I made sure to check. I first through the pistons were hypercast, turns out all were forged.
Are you even paying attention? You've got the same rods and crank as every other EJ18-22. Hold up, they will not.
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Old 12-10-2012, 10:17 PM   #15
Stangy
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Thanks for the straight talk. With retune and gt30 I should be fine correct. At moderate boost of course
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Old 12-10-2012, 11:11 PM   #16
fxt05
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Re tune on the stock ecu? Look into a standalone!
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Old 12-10-2012, 11:16 PM   #17
69subaru360
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Quote:
Originally Posted by Stangy View Post
Thanks for the straight talk. With retune and gt30 I should be fine correct. At moderate boost of course
NO! Did you even read everyone's posts?

Your rods are junk and will break.
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Old 12-10-2012, 11:36 PM   #18
i_c_the_light
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Don't bother. Obviously retarded.
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Old 12-11-2012, 12:11 AM   #19
GGSimpreza
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Quote:
Originally Posted by i_c_the_light View Post
Don't bother. Obviously retarded.
This.
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Old 12-11-2012, 12:48 AM   #20
blkgm8
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Listen to these guys... they know what they say. You asked and they gave you proper answers, also consider yourself lucky to run what you are running now with that setup and 440's. Yikes. You should probably be running 550's right now. Yes you are getting away with it, but a datalog of your injector duty cycle @ 20psi would be interesting. Get yourself a 257 bottom end and do a hybrid motor and then get that 30r on there with proper fueling and engine management and have fun. Dont forget that 6 speed swap either.

... or put your car on a massive weight reduction diet and get faster that way.
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Old 12-11-2012, 02:03 PM   #21
luciferMotorCade
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herebecausethisguyismessingwithyou. Happy holidays.
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Old 12-11-2012, 06:16 PM   #22
Stangy
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Quote:
Originally Posted by luciferMotorCade View Post
herebecausethisguyismessingwithyou. Happy holidays.
Weight reduction it is
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