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#46 Old 04-20-2009, 08:50 PM
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Hi all. I've been unable to post much, but between trips wanted to provide a brief update:

Have car! OMG.

Final parts list installed:

Organic STi clutch
STi VF39 turbo
GrimmSpeed Up-pipe w/ Flex Section ceramic coated
Cobb Accessport v 2.0
Invidea hi-flow catted downpipe
Invidea G200 catback system w/ silencer
Cobb SF intake
Cobb Tuning Lightweight Main Pulley
HKS 71004-AF008 HKS SSQV BOV Kit (recirc)
TXS TMIC Kit
Walbro 255 Fuel Pump
Subaru platinum plugs
Deastchwerks 650cc injectors

The map being run is as suggested above for now:
VF39 turbo, STi TMIC, STi "Pink" 565cc injectors & Turboback exhaust using 93 octane

The mechanic checked out the car with all gauges/probes/meters and everything was within parameters using the above map. Nice idle, amazingly fast smooth acceleration, no backfiring or misfiring. AF and temps fine. Taking it moderately easy while driving until I can get a protune. Exhaust smells a bit rich, but no CELs or errors in Cobb datalogger.

The clutch had serious shudder issues first couple of days... now OK, but when decelerating in gear, I hear sandy grinding noise through a small part of the decel range. Having this checked out tomorrow.

More to come... just checking in.

Cheers!

Last edited by Mr. Happy; 07-25-2009 at 09:14 AM.
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#47 Old 04-21-2009, 12:50 PM
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What is your AFR?

If you don't know then you may need a wideband 02 to check it out. B/c you are running a Cobb Map outside of its parameters. I realize your mechanic said it was within spec, but you still need know exactly what AFR you are running. You may be within the parameters at idle, but how about at WOT?

The Turbo XS TMIC and Intake and 650cc injectors are all out of spec with the Cobb Map notes. I highly recommend data logging, checking your AFR, and/or getting a protune. A good protune will give you more power and also your car will run better.
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#48 Old 04-21-2009, 01:22 PM
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You can't use different injectors than the map says.
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#49 Old 04-21-2009, 03:29 PM
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Quote:
Originally Posted by c2bcoolwrx View Post
What is your AFR?

If you don't know then you may need a wideband 02 to check it out. B/c you are running a Cobb Map outside of its parameters. I realize your mechanic said it was within spec, but you still need know exactly what AFR you are running. You may be within the parameters at idle, but how about at WOT?

The Turbo XS TMIC and Intake and 650cc injectors are all out of spec with the Cobb Map notes. I highly recommend data logging, checking your AFR, and/or getting a protune. A good protune will give you more power and also your car will run better.
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You can't use different injectors than the map says.
Please read these statements again as well as everything else in this thread. You are not getting it.

My name is Ken and I am a HP Junkie.
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#50 Old 04-21-2009, 04:49 PM
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Quote:
Originally Posted by Kjott21 View Post
Please read these statements again as well as everything else in this thread. You are not getting it.
+1.
Mr. Happy, we are only trying to help you, but you repeatedly are not taking our advice.

You are running a stock COBB Map w/o following the Map notes. You MUST NOT deviate from the map notes. Basically, since you already have the parts that are out of spec from the map notes you will need a custom protune for your specific setup.

Also, I would not trust a mechanic with this....find a reputable tuner (Cobb lists certified Cobb AP Tuners on their website, so you can find one in/close to your area). Please heed all of our advise or you could be in for more engine problems down the road, due to running too lean (AFR = Air to Fuel Ratio, just in case you don't know).
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#51 Old 04-23-2009, 04:27 PM
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All, I really do appreciate the patience and continued feedback. It may seem like I don't get it, but I really do... as stated in my earlier sentence: "Taking it moderately easy while driving until I can get a protune. Exhaust smells a bit rich, but no CELs or errors in Cobb datalogger." I am logging. I was monitoring AFR on the Cobb AP and cruising speeds yielded an average of 14.1. At high boost, it dropped below 11... and as I understand it, the AP is not good for reading below this level. No more high boost for me until protune.

I just got off the phone with a pro tuner with TopSpeed in Atlanta. He and his partner come to JAX and TPA to use local 4-wheel dyno. Everyone I ask says these guys are excellent tuners. I am making an appointment. In the mean time, I'll be monitoring my boost to keep it under 6-8 lbs and Long FT, which should be between -5% and +5%... with this and driving easy and I should be OK until the protune. I also don't have any sharp drop-offs in the DA, which is also a good sign.

I look forward to posting some dyno charts. Thanks again. I'll be baaaack.

Thanks again,

MH
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#52 Old 06-08-2009, 08:16 PM
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Hi folks.. another update. The update delay is partly due to my having riod surgery. Dang. I don't wish that on my worst enemy!

I've still been driving the car fairly easy until I get a protune with Topspeed in Atlanta. I'm still getting no ECU error codes on the Cobb.

After the mods, I noticed a loud grinding sound during decel across about a 500 rpm range in 3 and 4th gear. I took the car to local Scoob dealer and they attempted to fix it, again under warranty like the engine. They inspected my 49K mile car, found tranny problems and did an overhaul: new roller bearings, seals, and center diff assembly. While on rack I asked them to take a look at the new perf clutch because it had bad shudder and was burning more than I would think any new clutch should. (Not that I'm an expert!!) It turned out that only about 50% of the clutch plate was making contact, so they rotated it a notch and it now is much better. The plate was not scored at all.

Anyway, after i get the car back, the decel grinding noise is not appreciably better so I do some research and found this article:

Subaru WRX Transmission - Gear Set - Turbo Magazine

See item #5... Hmmmm. Happy new tranny parts.

About the grinding, I also read how tire pressure differential may be a fix ... sounds a bit strange. I have not tried that yet.

Stay tuned for dyno charts in late July.

Cheers, MH
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#53 Old 06-30-2009, 06:00 PM
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Other interesting oddities from Mr. Happy. A couple of weeks ago I removed the silver insert in the HKS SSQV because I'm not a fan of the whistling noise. About a week after that I noticed I was getting a flutter sound from the turbo during blow off. Upon reading many forums, I learned a) turbo flutter not good, and 2) some folks had flutter with this BOV. Also, I recalled a conversation with my soon-to-be tuner - one of the first things he said was something like "we recommend people use the WRX stock BOV - get rid of the HKS."

Gee, where have I heard that before... wait, I'll save you the trouble:

So, I replaced the HKS with the original WRX BOV. Turbo flutter is gone. I'm also getting higher boost... 3-5psi on average when I give it about the same amount of throttle. Bad HKS BOV or POS HKS BOV? Regardless, I'm returning it an we'll see what they say.

MH
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#54 Old 07-02-2009, 09:07 AM
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Originally Posted by Mr. Happy View Post
I'm also getting higher boost... 3-5psi on average when I give it about the same amount of throttle. Bad HKS BOV or POS HKS BOV? Regardless, I'm returning it an we'll see what they say.

MH
The HKS one is not one of the better ones but what people don't understand that 95% of all aftermarket BOV are adjustable/tunable.This means they probably are not "ready to go" out of the box and will require initial tuning of the part.If your getting higher boost,that clearly shows it was leaking.Usually the 50/50 BOV's are less temperamental and will act like the stock BPV under light boost (APS).

Homebrewed tuned with Opensource!
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#55 Old 07-25-2009, 09:02 AM
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Update and dyno results

I'll start by thanking everyone once again for all your feedback and advice.

I made an appointment at Topspeed in Atlanta and sent a datalog.

Scott Seigel noticed that my long term fuel trim was very low so he sent me a LIMP map to use until my tune. I had already replaced my stock BOV on the car, and at Scott's sugestions, I removed the Cobb SF intake and put the stock air intake back on the car. I get to Atlanta and after the first couple of dyno runs we discover my crunchy new STi performance clutch was slipping. Nice. Thankfully, the shop had one clutch in stock and they made the time to re-strap and tune my car at the end of the day. My STi clutch looked horrible - I'm taking that up with Subaru. The Atlanta shop installed an ACT clutch - I like it MUCH better, and no chatter! Also removed the Invidea exhaust silencer. Scott tuned my car a little aggressive only if I promised to get an STi hood scoop. Anybody got a silver one for sale or trade for a WRX scoop?

2005 WRX

Final parts list:

ACT clutch street disk SB3HDMMN
STi VF39 turbo
GrimmSpeed Up-pipe w/ Flex Section ceramic coated
Cobb Accessport v 2.0
Invidea hi-flow catted downpipe
Invidea G200 catback system
Cobb Tuning Lightweight Main Pulley
TXS TMIC Kit
Walbro 255 Fuel Pump
Deastchwerks 650cc injectors

The car sounds incredible... on the interstate next to concrete construction barriers, it sort of sounds like a P-51 mustang. Very sweet. Enjoying my new rocket! My wife semi-sarcastically says, "Gee honey, now I can here when you come home even when I'm in the back of the house."

For those of you who said things like "new BOV is bad idea" you know how you are... thanks again.

Oh, and... for sale:
HKS SSQV BOV barely used
Cobb SF intake barely used
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#56 Old 07-25-2009, 11:51 AM
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Very nice numbers!Scott and Topspeed are very well known names in the Subaru community!Glad you got everything worked out.FYI-Most dealership mechanics generally knows less than most die hard enthusiast(unless they are an enthusiast).

Homebrewed tuned with Opensource!
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