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Old 10-20-2014, 03:50 PM   #1
TheColorCute
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2004 Slow 6466 STi
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Default '04 STi | Twin-scroll 6466 1.15 a/r | Low boost tune from Ray @ TurboTek Tuning

Event: Dyno pull
Location: Quantum Race Works
Ambient Temp: 60
Weather: Cloudy, bit of rain

Car: 2004 STi
Tuner: Ray @ TurboTekTuning
Dyno Info: Dynapack
Transmission: 6 speed
Gear: 4th
Peak HP at RPM: 478
Peak Torque at RPM: 355
Baseline hp/tq for a stock on same dyno: 210
Target Boost: 20psi (wastegate pressure is 25psi)
Target AFR: 11s
Fuel: 93 unleaded

Engine/Power Modifications:
  • Eagle rods
  • CP Carrillo pistons
  • ACL Race bearings (rod and main)
  • Slight PnP on the heads
  • GSC 272s
  • DBB PTE 6466 Divided T4 1.15 a/r
  • Custom twin-scroll up pipe
  • Custom downpipe
  • Custom twin-scroll headers
  • Dual TIAL 38mm EWG
  • Custom FMIC setup with Garret core (fed straight up through the grille)
  • Dual trunk-mounted Bosch 044s
  • Surge tank fed by a DeatschWerks 300lph
  • Bosch 2000cc EV14 injectors
  • Custom fuel rails
  • Custom fuel lines
  • Koyorad radiator
  • AEM EMS Series 2
  • Aquamist HFS-6 water/methanol injection (no meth this time though)
  • Speed density (with AEM 5 bar MAP sensor and AEM IAT sensor)
  • Custom AOS
  • Exedy twin
  • ACT ProLite FW

Super conservative on this one because this isn't the race motor, but numbers on this map were ~480whp.. Low boost @20psi on wastegate pressure (EBCS wasn't cooperating, need to dig up my MBC for full wastegate pressure), pump gas, no meth injection, revving low to 7300. Ray kept the tune and timing conservative to be nice to the motor. Car pulls like crazy and drives smooth! Going back in soon for 25psi with meth, and then again once we get the race motor in for 38psi on E85!

Dyno plot:



Video:

Coming soon! Gotta pull it off the camera

Pictures:





Track setup:

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Last edited by TheColorCute; 10-22-2014 at 10:45 AM.
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Old 10-20-2014, 03:54 PM   #2
Ray@revitup
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Target afr 11.00 not 10's lol
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Old 10-20-2014, 03:58 PM   #3
TheColorCute
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Quote:
Originally Posted by Ray@revitup View Post
Target afr 11.00 not 10's lol
Whoops, corrected!
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Old 10-20-2014, 04:48 PM   #4
xluben
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When's the 800WHP going to happen?

What's your EBCS setup that's creating lower boost than wastegate pressure? 4 port?

You could just run a vacuum hose from compressor to EWG for spring pressure.
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Old 10-20-2014, 04:57 PM   #5
TheColorCute
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Quote:
Originally Posted by xluben View Post
When's the 800WHP going to happen?

What's your EBCS setup that's creating lower boost than wastegate pressure? 4 port?

You could just run a vacuum hose from compressor to EWG for spring pressure.
As soon as I order a closed deck from Outfront

It was a Grimmspeed 3-port.

That's how I have it run right now -- drove to the shop on spring pressure, quickly installed the EBCS outside the shop, then took it out and went back to spring pressure once the car started cutting out around 5300 on the EBCS -- maybe one of the lines wasn't fully tightened? Spring pressure is 25psi, but for whatever reason it peaked at 20psi.

Do you have any ideas, Ray?
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Old 10-20-2014, 05:24 PM   #6
Ray@revitup
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No Clue, but at 0 wgdc it was hitting sky rocket high boost.
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Old 10-20-2014, 05:26 PM   #7
bjohnson_55
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Quote:
Originally Posted by Ray@revitup View Post
No Clue, but at 0 wgdc it was hitting sky rocket high boost.
polarity of ebcs set in Aem?
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Old 10-20-2014, 05:29 PM   #8
Ray@revitup
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Yes sir, everything was set properly on the ems. we are achieving the boost we wanted with out it, once the op gets his new motor we will figure out the boost control setup and let it ride
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Old 10-20-2014, 05:35 PM   #9
TheColorCute
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Quote:
Originally Posted by Ray@revitup View Post
No Clue, but at 0 wgdc it was hitting sky rocket high boost.
What was it hitting at 0 WGDC? I couldn't hear half the stuff you were yelling at me from the dyno ahaha
Quote:
Originally Posted by Ray@revitup View Post
Yes sir, everything was set properly on the ems. we are achieving the boost we wanted with out it, once the op gets his new motor we will figure out the boost control setup and let it ride
Yessir! Gonna be grabbing me a v3 Outfront block vurrrryyyy soon!
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Old 10-20-2014, 05:38 PM   #10
Ray@revitup
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Quote:
Originally Posted by TheColorCute View Post
What was it hitting at 0 WGDC? I couldn't hear half the stuff you were yelling at me from the dyno ahaha

Yessir! Gonna be grabbing me a v3 Outfront block vurrrryyyy soon!
it was going to head north of 27 psi which is what i had the limiter set too,i don't know what it would of actually went to, i wasn't chancing it.
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Old 10-20-2014, 05:41 PM   #11
SkateAndDestroy
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First time I've heard Dynapack and heatbreaker in the same breath lol


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Old 10-20-2014, 05:50 PM   #12
TheColorCute
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Quote:
Originally Posted by Ray@revitup View Post
it was going to head north of 27 psi which is what i had the limiter set too,i don't know what it would of actually went to, i wasn't chancing it.
Probably a good idea, it jumped to 32psi when Jr had it on the dyno last year ahaha
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Old 10-20-2014, 10:49 PM   #13
xluben
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Sounds like the EBCS was causing high boost. That's a lot more likely than low.
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Old 10-21-2014, 10:38 AM   #14
TheColorCute
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Quote:
Originally Posted by xluben View Post
Sounds like the EBCS was causing high boost. That's a lot more likely than low.
That 32psi that Jr hit was on spring pressure with the EBCS disconnected. The WGs were definitely not springed to 32 psi ahaha. It would overboost above wastegate pressure for the longest time, until we installed an O2 sensor that we were missing during the tune with Jr, at which point it started boosting to whatever spring pressure was, like it should have. Then when we slapped the EBCS back in for a day before the tune with Ray, it would hit 30psi+ with the EBCS installed, and then when I pulled the EBCS and reverted it to WG pressure, it went back down to spring pressure. Any ideas, Ben?

Last edited by TheColorCute; 10-21-2014 at 10:48 AM.
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Old 10-21-2014, 11:00 AM   #15
xluben
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Quote:
Originally Posted by TheColorCute View Post
That 32psi that Jr hit was on spring pressure with the EBCS disconnected. The WGs were definitely not springed to 32 psi ahaha. It would overboost above wastegate pressure for the longest time, until we installed an O2 sensor that we were missing during the tune with Jr, at which point it started boosting to whatever spring pressure was, like it should have. Then when we slapped the EBCS back in for a day before the tune with Ray, it would hit 30psi+ with the EBCS installed, and then when I pulled the EBCS and reverted it to WG pressure, it went back down to spring pressure. Any ideas, Ben?
Well, my initial comment was because you stated (or maybe I misinterpreted your statement) that the EBCS caused the car to under boost. It's not really possible for a 3 port to cause the car to boost lower than spring pressure, so that is why I brought it up.

A wastegate on spring pressure is a mechanical system. Adding a sensor elsewhere in the car shouldn't make any difference. Assuming it's hooked up right (and that wasn't changed) it could be something as small as a leaking vacuum line (or pinched vacuum line).

I know the GS EBCS comes with the tiny barbed fittings. If you were using larger vacuum lines (like the ones that fit on the nipple on PTE turbo's and most EWG's) and didn't use a vacuum line size reducer (two of them actually), then it's quite possible the lines to the EBCS were leaking, and this would cause the overbost.
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Old 10-21-2014, 11:13 AM   #16
TheColorCute
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Quote:
Originally Posted by xluben View Post
Well, my initial comment was because you stated (or maybe I misinterpreted your statement) that the EBCS caused the car to under boost. It's not really possible for a 3 port to cause the car to boost lower than spring pressure, so that is why I brought it up.

A wastegate on spring pressure is a mechanical system. Adding a sensor elsewhere in the car shouldn't make any difference. Assuming it's hooked up right (and that wasn't changed) it could be something as small as a leaking vacuum line (or pinched vacuum line).

I know the GS EBCS comes with the tiny barbed fittings. If you were using larger vacuum lines (like the ones that fit on the nipple on PTE turbo's and most EWG's) and didn't use a vacuum line size reducer (two of them actually), then it's quite possible the lines to the EBCS were leaking, and this would cause the overbost.
Well, the car was hitting boost cut at 5300 with the EBCS in, and then pulled through the rev range fine on WG pressure with no EBCS. So, it's possible that there is an electrical problem or something along those lines with the EBCS setup, because in this case, overboosting wasn't an issue on the EBCS, but underboosting was, and like you said, it's not really possible to underboost below spring pressure, so that would lead me to believe that it might be an issue with how the EBC is wired in the car which was causing it to hit boost cut at 5300. But I'll have to look into the possible leak in the lines, which would make sense as to why it would overboost so far.

Quote:
Originally Posted by Ray@revitup View Post
it was going to head north of 27 psi which is what i had the limiter set too,i don't know what it would of actually went to, i wasn't chancing it.
Ray, when it was trying to boost past the 25psi target, that was on spring pressure right, and not the EBCS?

Last edited by TheColorCute; 10-21-2014 at 11:21 AM.
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Old 10-21-2014, 01:34 PM   #17
subbi7
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Like the intercooler setup!
I have somthing similar..
What is the size of the intercooler core?

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Old 10-21-2014, 01:56 PM   #18
TheColorCute
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Quote:
Originally Posted by subbi7 View Post
Like the intercooler setup!
I have somthing similar..
What is the size of the intercooler core?

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Thank you, sir! This one should be a 3.5''.

Post up some pictures of your setup!
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Old 10-21-2014, 02:38 PM   #19
Paul
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what header is being used?
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Old 10-21-2014, 03:28 PM   #20
TheColorCute
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Quote:
Originally Posted by Paul View Post
what header is being used?
Whoops, forgot to post that in the OP. My bad! It's a custom twin-scroll header, based off the JDM twin-scroll headers
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Old 10-21-2014, 03:46 PM   #21
subbi7
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I dont know how to post pics from my mobile..
What is the hight of the core and from side to side?

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Old 10-22-2014, 10:07 AM   #22
CatfaceType-R
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I think it needs one more spoiler.
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Old 10-22-2014, 10:33 AM   #23
TheColorCute
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I think it needs one more spoiler.
No way! We put lots of work into the physics and airflow and found that 4 spoilers provide the most effective amount of downforce to allow the car to successfully achieve hyperspeed
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Old 10-24-2014, 12:13 PM   #24
Subian
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I think it needs one more spoiler.
I laughed pretty hard when I first saw that too. I did one of these at first...
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Old 10-25-2014, 11:04 AM   #25
KillerBMotorsport
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Definitely sounds like a leak, as xluben mentioned, or something is wrong with the plumbing or the G-S unit itself.

Some things to consider... Generally when going to TS you need to lower spring pressure than with a single scroll setup. With Single scroll you want spring pressure to be ~40-50% of your target boost. With TS 30-40% is a better place to be. This will give you best boost modulation and control. Remember, even though you have two wastegates you have lower manifold pressure (low RPM) running twin scroll so the WGs need to open more to flow enough to regulate well under lower RPM conditions. You may also find the torque will come on a bit sooner and hit harder running them this way. Although, with a massive T4 housing you might notice a more marginal difference if any. Up top creep is always more prone on a TS setup because the housings don't flow as well at high RPM, which is why TS setups won't make as much peak power as their SS counterparts. If the WG subs and plumbing are done properly, you should still have plenty of available flow with the two 38mm WGs.
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