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Old 04-03-2020, 07:23 PM   #11876
Gigs90
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Quote:
Originally Posted by mrmikeyp View Post
Hey again,

In the process of working with a tuner and i'm concerned my AFR's are around 17 while on boost. theyre around 14 just moving around town off boost. Boost gauge reads ~18 vac at idle. I am able to get to my boost target of ~15 it just doesn't feel great getting there. I dont want to do more WOT runs until I can get that AFR down.

Things ive done/checked:

-Boost pressure test. Found a number of leaks at recirculating valve and turbo inlet. I'll probably do another test today.
-Fuel pressure is fine with no leaks at the pump or elsewhere. ~40 at idle, FP follows boost going up. No vac leak at FPR, confirmed that with the fuel pressure test.
-cleaned my MAF
-Stock Front 02 sensor is at the top of the DP and reading similar to my wideband.

Anything else I can look into other than doing another boost pressure test?
That is extremely lean if its indeed 17AFR

As an example under load from 4000-7500 we aim for 10.8-11.0 on 93 octane and 11.7 to 12.0 on E85

Something is messed up if its that lean
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Old 04-03-2020, 07:28 PM   #11877
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Quote:
Originally Posted by Gigs90 View Post
That is extremely lean if its indeed 17AFR

As an example under load from 4000-7500 we aim for 10.8-11.0 on 93 octane and 11.7 to 12.0 on E85

Something is messed up if its that lean
agreed.

what else can i look at?
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Old 04-03-2020, 07:44 PM   #11878
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Quote:
Originally Posted by mrmikeyp View Post
agreed.

what else can i look at?
I would take it to a reputable shop at this point unless you have datalogs pointing to a specific issue. You are rolling very expensive dice. Possibly a failing fuel pump under load could be my only thought.
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Old 04-03-2020, 07:55 PM   #11879
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Quote:
Originally Posted by Gigs90 View Post
I would take it to a reputable shop at this point unless you have datalogs pointing to a specific issue. You are rolling very expensive dice. Possibly a failing fuel pump under load could be my only thought.
fuel pumps a new walboro 255.

i'll find a smoke tester somewhere
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Old 04-04-2020, 03:24 PM   #11880
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Did another boost leak test and got the turbo inlet hose to seat better. that whole pre turbo area is golden now.

However i noticed a leak while holding around 15psi. It was what looked like the injectors. Spraying soapy water at them i got bubbles instantly and an audible hiss. Drivers side injectors were worse than passenger side, but the pass side still bubbled a bit.

I haven't encountered this sort of problem before, but makes sense that it would be a contributing factor to too much air in the system.

I'm going to look for new o-rings and try to fix them. They're the pink injectors. Any pro-tips to have this not happen again? Brands to avoid etc?
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Old 05-05-2020, 06:48 PM   #11881
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Quote:
Originally Posted by mrmikeyp View Post
Did another boost leak test and got the turbo inlet hose to seat better. that whole pre turbo area is golden now.

However i noticed a leak while holding around 15psi. It was what looked like the injectors. Spraying soapy water at them i got bubbles instantly and an audible hiss. Drivers side injectors were worse than passenger side, but the pass side still bubbled a bit.

I haven't encountered this sort of problem before, but makes sense that it would be a contributing factor to too much air in the system.

I'm going to look for new o-rings and try to fix them. They're the pink injectors. Any pro-tips to have this not happen again? Brands to avoid etc?
Gonna tie a bow on this.

I got the injectors flow tested and they weren't great, also put new seals in there. Turns out what you get from subaru, or rallysport, or napa auto are all the same seals...go cheapest IMO.
No more leaks at all doing a boost pressure test. But after I was still lean on boost. Bought a new MAF and issue solved. I was using the old wrx MAF which i guess wasn't that great. No issues anymore except with Romraider. Engine is perfectly fine. 10-11 afrs on boost
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Old 05-05-2020, 07:04 PM   #11882
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never mind i mis read your post
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Old 11-02-2020, 05:34 PM   #11883
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Quote:
Originally Posted by mrsaturn7085 View Post
R205 VF56 p/n = ST14411ZR000
S206 VF58 p/n = ST14411ZR010

Both are approximately 2700 USD ea.

VF58 is not a confirmed IHI turbo "number", but the S206 turbo *is* different from the R205 (VF56).

STI would not provide me with any further info without papers confirming ownership- they definitely intend to keep the special edition models 'exclusive' for a while.
This post is several years old now.. but I can confirm that the VF58 part # is ST14411ZR010. It was used on the S206, S207, S208 & Type RA-R. It also isn't for sale to the public.. I've heard that it's nearly impossible to purchase even with proof of ownership.

It's the ultimate iteration of the IHI Subaru turbochargers. It's quite similar to the R205's VF56, but with a few upgrades:
  • 6+6 blade compressor wheel w/ "upgraded" straight blade profile (VF56 has curved profile like the other VFs)
  • Revised, better performing & more durable ball bearing CHRA (in comparison to VF56)
  • Upgraded "S" marked IWG actuator for holding more boost at lower WGDCs (unique to the VF58)
  • 9 blade Titanium Aluminide (TiAl) turbine wheel & shaft (same as VF56)
My personal VF58 turbo setup...
  • OEM JDM S208 IHI VF58 Twin Scroll Turbocharger
  • Ceramic Dual Ball Bearing CHRA - SCHENCK balanced
  • Forged Billet Aluminum 6+6 Compressor Wheel w/ Extended Tips (Reducing rotational mass while also improving flow)
  • OEM Titanium Aluminide (TiAl aka Gamma-Ti) 9-Blade Turbine Wheel & Shaft (Significantly reducing rotational mass while improving flow, spool, transient response)
  • Lightly Ported/Polished Compressor Inlet
  • Ported Turbine Housing Inlet Scrolls (~16% larger cross-sectional area improving spool and top-end performance)
  • Cerakote Ceramic High Temperature Coating applied to the Turbine Housing (Retaining the heat, maximizing exhaust gas energy, improving spool and reducing under-hood temps & IATs)
  • Forge Motorsport Billet Aluminum IWG Actuator (Improved durability and wastegate control/response along with higher boost levels)
  • OEM JDM S208 Equal Length, Twin Scroll Header & Uppipe

Before:




After:















Last edited by WRXnick16; 11-02-2020 at 05:55 PM.
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Old 01-23-2021, 02:29 AM   #11884
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V9 EJ207 was just delivered today and I began the tear down to get it back in driving shape. I was disappointed to find rust in 2 of the intake valves, going to let it soak in seafoam and then vacuum out with a shop vac, what you guys think?



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Old 01-23-2021, 03:03 PM   #11885
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Take the heads off and check the bores.

Strip the valves out of the heads and check everything properly.
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Old 01-23-2021, 09:15 PM   #11886
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Great info here

Anyways I'm going to be buying a ver9 2005 140km on the clock
Do you guys think to high on the Kms

Car looks mint other wise bone stock
Only seems to have a 50/50 bov

Anything I should look at carefully ?
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Old 01-23-2021, 09:42 PM   #11887
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take it to a reputable shop for a pre purchase inspection
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Old 01-24-2021, 02:23 PM   #11888
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Quote:
Originally Posted by Gigs90 View Post
take it to a reputable shop for a pre purchase inspection
Cool thanks
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Old 02-22-2021, 09:02 PM   #11889
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sooo.. does anyone here know where to buy aftermarket single avcs cams for JDM heads....?
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Old 02-22-2021, 09:20 PM   #11890
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Quote:
Originally Posted by murrdogg24 View Post
sooo.. does anyone here know where to buy aftermarket single avcs cams for JDM heads....?
The cams are different on early and late JDM STi's, you get a higher lift and use a larger exhaust follower clearance on the later engines (spec C and normal JDM STi profile is the same on widetrack blobeye and hawkeye)

RCMS sell a copy of the later cam https://rogerclarkmotorsport.co.uk/s...-kit-sti-v7-v9

buckets have no seperate shims, they are bought to size and an expensive item if you need a full set to get the correct clearances.
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Old 02-22-2021, 09:20 PM   #11891
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Quote:
Originally Posted by murrdogg24 View Post
sooo.. does anyone here know where to buy aftermarket single avcs cams for JDM heads....?
Jun
Kelford
HKS
RCM

The JDM variants you can source directly or via Japanparts

Kelford has a few NA retailers and RCM can be imported via Flatirons tuning
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Old 02-22-2021, 09:29 PM   #11892
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Thanks. I have a V9 EJ207 but I have not begun the teardown yet. I will look into RCM.

Quote:
Originally Posted by johnfelstead View Post
The cams are different on early and late JDM STi's, you get a higher lift and use a larger exhaust follower clearance on the later engines (spec C and normal JDM STi profile is the same on widetrack blobeye and hawkeye)

RCMS sell a copy of the later cam https://rogerclarkmotorsport.co.uk/s...-kit-sti-v7-v9

buckets have no seperate shims, they are bought to size and an expensive item if you need a full set to get the correct clearances.
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Old 02-23-2021, 03:09 PM   #11893
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Quote:
Originally Posted by murrdogg24 View Post
Thanks. I have a V9 EJ207 but I have not begun the teardown yet. I will look into RCM.
That will have the later spec cams. Do you need cams or just checking out the field?
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Old 02-23-2021, 03:11 PM   #11894
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Originally Posted by johnfelstead View Post
That will have the later spec cams. Do you need cams or just checking out the field?
I'm just feeling out options in case I keep this blown engine and decide to rebuild it. Might as well go all out if I'm tearing the engine down.
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Old 02-23-2021, 03:37 PM   #11895
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Quote:
Originally Posted by murrdogg24 View Post
I'm just feeling out options in case I keep this blown engine and decide to rebuild it. Might as well go all out if I'm tearing the engine down.
The stock cams are brilliant in this spec, i'm getting over 700BHP out of them on a TA car and my daily/sprint car is running circa 500BHP/540lbft with them.

Spend your money elsewhere if the OEM cams are in good condition.
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Old 02-23-2021, 03:46 PM   #11896
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Quote:
Originally Posted by johnfelstead View Post
The stock cams are brilliant in this spec, i'm getting over 700BHP out of them on a TA car and my daily/sprint car is running circa 500BHP/540lbft with them.

Spend your money elsewhere if the OEM cams are in good condition.
Yeah you're right might as well just do the bottom end and save up for 6 speed swap.
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Old 02-23-2021, 04:15 PM   #11897
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He is right the cams on the V8/9 207s are excellent and even in Japan you rarely see them modified outside of demo cars showing them off
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Old 08-19-2021, 09:52 PM   #11898
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Version 10 EJ207. Pump gas, 25psi FP green. Stock plugs are ILFR6A. I want to run one step colder and copper plugs.

BKR7E or LFR7A? I ran BKR7EIX on my V8 before but I see that the reach is over 7mm shorter on the BKR7 vs the LFR6/7A (which I confirmed on Amayama is the OEM plug).

Perhaps Mick Dr20t can chime in.

Last edited by 2JZ; 08-20-2021 at 09:22 AM.
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Old 11-20-2021, 11:25 PM   #11899
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Anyone have a more recent emissions update than ~2018-19? USDM EJ205 ECU from 02-03 WRX still working to get through? Or refer me to RomRaider (link would be helpful) - haven't spent much time there... yet.

My v7 EJ207 developed internal issues ~2017 and the car has basically sat for the last 4 years. Currently prepping to finally tear it down and most likely rebuild with a fresh block. It has already been rebuilt.

I'm leaning towards the GRB thick wall OEM built part number 10103AC510. That said, I did see some vendors (UK I believe) complaining the revised castings have a notch out of the cylinder wall. Doesn't look terrible to me - LINK.

A while back it was mentioned to source a v7 block from Aus and I happen to have left some AUD there waiting for the exchange rate to regain. It never did..

This is a great thread and wish I spent significantly more time memorizing it 10 years ago. Thanks to all the contributors over the years.
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Old 12-13-2021, 05:16 PM   #11900
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V7 head cams can handle 500whp ? Thanks
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