Welcome to the North American Subaru Impreza Owners Club Wednesday June 29, 2016
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC General > Proven Power Bragging

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads. 
Reply
 
Thread Tools Display Modes
Old 05-05-2013, 01:10 PM   #1
jkopinga
Scooby Newbie
 
Member#: 220799
Join Date: Aug 2009
Chapter/Region: International
Location: Taiwan
Vehicle:
2006 Impreza WRX
WRC Blue

Default 2006 WRX w/ BW EFR8374 0.83 A/R IWG

Event: Dyno Tune
Location: CS Racing, Taiwan
Ambient Temp: 26* Celsius
Elevation: 75ft
Weather: Sunny
Tires: Federal 595RS-R

Car: 2006 WRX
Tuner: Jasper Kopinga
Dyno Info: DynaPack
Transmission: 6spd MY07 STI gearset
Gear: 4th
Peak HP at RPM: 460whp @ 6100 Uncorrected (498.6 SAE)
Peak Torque at RPM: approx. 430 lb-ft @ 5200 Uncorrected (460 SAE)
Baseline hp/tq for a stock on same dyno: NA
Target Boost: 1.8 Bar or 26 psi
Target AFR: 11.6
Fuel: RON 98 (Equivalent to MON 93 approx.)
Engine Modifications:

Manley pistons 99.5mm w/ Machined dishes
Cometic Phuzion Headgaskets
ACL bearings
BC Vernier Pulleys on Exhaust cams
Gates Racing Timing belt
Custom fabbed 2x BMW 335i core FMIC w/ Endtanks 2.5" inlet, 3" Outlet
Equal Length headers wrapped
Custom Downpipe wrapped














A link of one of the Dyno pulls:


First Impressions of the Turbo are that it is an absolute animal. It is a bit laggy though and I think I still need to tinker a bit with my CAM centerlines on the exhausts.

This turbo definitely needs CAMs to make the most of it as I already expected and I will know more when I test the 2 sets of GSC cams I bought which are the S2 and S3 with Beehive springs, etc.

I originally ordered the EFR7670 for my car but it took way too long so when I had a lead on the EFR8374 I thought it's better to have A turbo than none at all. Finally my EFR7670 arrived and I will be testing that which will be much better on OE cams than this one.

Will be editing this later on to add more info, comments.

Jasper Kopinga
CS Racing
Taiwan.
* Registered users of the site do not see these ads.

Last edited by jkopinga; 05-05-2013 at 01:21 PM.
jkopinga is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 05-05-2013, 01:10 PM   #2
jkopinga
Scooby Newbie
 
Member#: 220799
Join Date: Aug 2009
Chapter/Region: International
Location: Taiwan
Vehicle:
2006 Impreza WRX
WRC Blue

Default

Reserved #1
jkopinga is offline   Reply With Quote
Old 05-05-2013, 01:10 PM   #3
jkopinga
Scooby Newbie
 
Member#: 220799
Join Date: Aug 2009
Chapter/Region: International
Location: Taiwan
Vehicle:
2006 Impreza WRX
WRC Blue

Default

Reserved #2
jkopinga is offline   Reply With Quote
Old 05-05-2013, 01:11 PM   #4
jkopinga
Scooby Newbie
 
Member#: 220799
Join Date: Aug 2009
Chapter/Region: International
Location: Taiwan
Vehicle:
2006 Impreza WRX
WRC Blue

Default

Reserved #3
jkopinga is offline   Reply With Quote
Old 05-07-2013, 09:11 AM   #5
GA scooby
Scooby Newbie
 
Member#: 229518
Join Date: Nov 2009
Chapter/Region: South East
Location: Atlanta, Ga
Vehicle:
2011 STi
DGM

Default

In for results comparing the two EFR's. That thing looks monstrous.
GA scooby is offline   Reply With Quote
Old 05-08-2013, 05:51 AM   #6
Beetspeed
Scooby Newbie
 
Member#: 166264
Join Date: Dec 2007
Location: Netherlands, Europe
Vehicle:
1974 VW 2.2ltr 7670
402 WHP @ 30psi

Default

Is this on a 2 ltr WRX Jasper?
Edit: I see EJ25 on the dynograph now...oeps.
For a 2,5 ltr engine, just 170hp at 4000 rpm is a bit odd and/or disappointing especially for such a small A/R hot side?
Beetspeed is offline   Reply With Quote
Old 05-08-2013, 11:39 AM   #7
arizonaclimbing
Scooby Newbie
 
Member#: 69335
Join Date: Aug 2004
Location: Chandler, Az.
Vehicle:
2005 STI
Black

Default

This graph makes me have buyers remorse for the TS 8034 External WG version I just bought yesterday.
I sure hope there is something wrong with the tuning or setup for this turbo.
Late scrolling and dead by 6k.
arizonaclimbing is offline   Reply With Quote
Old 05-09-2013, 08:48 AM   #8
jkopinga
Scooby Newbie
 
Member#: 220799
Join Date: Aug 2009
Chapter/Region: International
Location: Taiwan
Vehicle:
2006 Impreza WRX
WRC Blue

Default

Beetspeed (Walter IIRC),

I know 170 BHP isn't a lot but keep in mind that this is REAL whp figures (no B.S.)
In the usually posted SAE terms that would be at least 185 whp with a CF of 1.00

I agree it isn't a lot. However keep in mind that I am running completely STOCK heads and STOCK cams at the moment. Timing is pretty conservative ESPECIALLY at the topend. Furthermore my compression ratio is approx. 8.2:1 to be able to make some reasonable figures on RON98 pump fuel. Too high a compression ratio usually ends up in tears (been there done that).

The 0.83 A/R hotside isn't "SMALL". It could well be larger than the 0.92 A/R TS in terms of actual volute area. Since I have never gotten my hands on one though I can't comment firsthand. In general on a Subaru 0.8x A/R housing work best in SS. 0.9 ~ 1.1 in TS work better but do not produce more topend than the 0.8x SS hence that I think the actual volute are isn't the same.

Arizonaclimbing,

Why would you have remorse? I ordered a EFR7670 in the first place as I already knew it was going to be laggy, especially on stock heads, cams, etc. However I simply thought it was better to have A turbo than none at all at the time when there was a chance.

The reason you THINK I am dead by 6k is because I was keeping timing very conservative there, especially beyond. I could have easily kept power flat to 7k but after that it would have gone down regardless due to cams.

I have 2 more engines I am building now.
A) 2.5L built w/ 272* S2 GSC cams, etc.........
B) 2.35L DE-Stroker w/ 282* S3 GSC cams, etc........

Either of those will yield MUCH more potential from the EFR8374 than the EFR7670 which will be easily out of flow. Just compare my figures with the ones from Jeff Perrin and I am sure you will see what I mean. HIS are SAE corrected figures. Surely the EFR7670 spools quicker but runs easily out of puff at the topend AND he had water/meth. I will easily hit 500 WHP ( 540 SAE ) with water/meth but it isn't a priority right now.

I will certainly test the EFR7670 but am out of Taiwan for business right now but will keep updating, etc. Stay tuned! ;-)
jkopinga is offline   Reply With Quote
Old 05-09-2013, 01:25 PM   #9
Beetspeed
Scooby Newbie
 
Member#: 166264
Join Date: Dec 2007
Location: Netherlands, Europe
Vehicle:
1974 VW 2.2ltr 7670
402 WHP @ 30psi

Default

Thanks for the clarification Jasper!
I agree that on a low reading dyno, 170 WHP could be well over 200 crank hp.
Also a single scroll T3 0.83 A/R is pretty big and can sustain 800 hp as seen with Evo's, so some lag was to be expected.
Pity you didn;t end up with a 1.05 T4 twin-scroll, but the power and respons are probably still there.

Cheers,
Walter
Beetspeed is offline   Reply With Quote
Old 05-09-2013, 02:22 PM   #10
jkopinga
Scooby Newbie
 
Member#: 220799
Join Date: Aug 2009
Chapter/Region: International
Location: Taiwan
Vehicle:
2006 Impreza WRX
WRC Blue

Default

Hi Walter,

I don't really mind the lag IF I could pull more revs but on the OE cams, heads it just doesn't pay off. I have read and tested a lot of TS turbos on Subarus.
In my opinion if you go for a Front Mount turbo then TS is deffo the way to go. If it is in the OE or rotated position I tend to get better results with SS. I think for TS to work well one needs very short headers to make it very effective like Honda, EVO, etc....
On smaller turbos I usually get better response AND better topend on SS turbos.

TS works best on short headers with high pulse pressure and high temperature.
SS works best on long headers with low pulse pressure (high volume) but colder pressure.

I am always in to learn, study and test more but at the moment I think my conclusion is as above.

Cheers,

Jasper.
jkopinga is offline   Reply With Quote
Old 05-09-2013, 02:24 PM   #11
wrxadam05
Scooby Specialist
 
Member#: 84070
Join Date: Mar 2005
Location: St. Paul, MN
Vehicle:
2015 Fiesta ST - E30
500whp GRB STI

Default

I'm glad to be part of your madness .
wrxadam05 is offline   Reply With Quote
Old 05-09-2013, 02:26 PM   #12
jkopinga
Scooby Newbie
 
Member#: 220799
Join Date: Aug 2009
Chapter/Region: International
Location: Taiwan
Vehicle:
2006 Impreza WRX
WRC Blue

Default

^^^^ LOL @ Adam,

Thanks for keeping the parts up! Will be updating as new tunes and/or parts, engines are being tested.

Jasper.
jkopinga is offline   Reply With Quote
Old 05-09-2013, 02:28 PM   #13
wrxadam05
Scooby Specialist
 
Member#: 84070
Join Date: Mar 2005
Location: St. Paul, MN
Vehicle:
2015 Fiesta ST - E30
500whp GRB STI

Default

No problem, that is what I'm here for. And emotional and technical support
wrxadam05 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

All times are GMT -4. The time now is 03:55 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2016, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2016 Axivo Inc.
Copyright ©1999 - 2016, North American Subaru Impreza Owners Club, Inc.