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Old 02-03-2009, 11:48 AM   #1
wtdash
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Member#: 59182
Join Date: Apr 2004
Location: N. Idaho
Default TD04 High Boost Issue on Legacy EJ22T

I'm running the newer/lighter spring TD04 Wastegate Actuator and still getting 10+ psi @ the WG (should be <8 psi).

From what I've read here and elsewhere the '02-05 TD04 WG should be about 10 psi ON A WRX, and the the '06+ should be <8 psi ON A WRX. I emphasize the WRX since I have limited/no psi info w/the TD04 on an EJ22T....but rumor is that the larger displacement 2.2 vs the WRX 2.0 would cause a higher boost???

I have 2 of the lighter spring WG actuators and I get same result w/both, so there's something in my setup that's causing an unusually high boost.

I've also tested this with 2 of the stock boost control solenoids (BCS) and got the same result....since my WG is higher than the BCS, it just bypasses it @ anything over the stock ECU's 8.7 psi anyway.

The car starts/runs great, other than a high (1800+RPM) idle until warm. When I had the MBC w/the FCD installed @ 14psi it pulled hard and smooth all the way to redline.

My Setup:
- '93 EJ22T swapped into a '90 Legacy.
- TD04 w/newer/lighter spring WG actuator (update: This was tested to be 10psi.)
- '06 TMIC
- 440cc injectors (just installed - made no difference)
- Coffe cup/reasonator delete mod
- Snorkus mod
- Diamond coil pack
- Turbo 4EAT tranny and Turbo TCU
- 3" Turbo-back exhaust
- Bellmouth downpipe
- STi fuel pump
- Lightweight (not UD) pulley

Thoughts/suggestions?
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Last edited by wtdash; 02-04-2009 at 11:44 PM.
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Old 02-03-2009, 12:29 PM   #2
Matt Monson
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Location: Teh Ghetto Garage, CO
Vehicle:
99 2.5RS, '85 911
'73 914 and 2012 BRZ

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Where are you located?
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Old 02-03-2009, 12:30 PM   #3
wtdash
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N. Idaho...near Spokane, WA.

I'll update my Sig.

Thanks
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Old 02-03-2009, 02:03 PM   #4
Matt Monson
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'73 914 and 2012 BRZ

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What kind of elevation is that? Here in Colorado at 5000ft the cars compensate and run around 10psi on just the stock turbo. Did you ever have a gauge on the car before changing turbos? You could have been running high all along since the atmospheric pressure sensor on these cars gets involved and only at sea level will you run close to the 8.7 psi published number.
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Old 02-03-2009, 02:35 PM   #5
wtdash
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We're @ 2200ft.

No, I'm starting to regret not having the boost gauge for a baseline before the mods.

After the swap I ran the car completely stock for 2 weeks b4 the TD04/TMIC/etc install.

But, FWIW, the boost gauge always shows 13 psi @ fuel cut.

And there was a noticeable difference between the stock's 9ish psi and the TD04's 14 psi I ran w/an MBC and FCD installed...I removed them in anticipation of getting the Revtronix's Stage 2 chip.

Thanks
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Old 02-04-2009, 11:39 PM   #6
blkgm8
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02 6 Speed Bugeye

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Sounds like you are getting a couple of pounds of boost creep... You have a rather large exhaust with a restrictive turbine section and the air will want to take the path of least resistance... bypassing the wastegate a little.
This was always a problem for me early on in my dsm days when putting a huge exhaust on with stock turbo... The boost would overshoot by 2 to 3psi over what it should have been...
Our remedy was to port the entry to the wastegate.... create a taper so that the entryway to the wastegate is not just a wall. You are trying to lead the air into the wastegate hole...
I am not sure if this is your exact problem.... but sounds pretty familiar.... and porting/blending the wastegate hose was our solution. By the way... this was also always on the stock wastegated tdo4 or td05 turbos.

Wastegate hole porting or switch to external always fixed the problem.
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Old 02-05-2009, 12:28 AM   #7
wtdash
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blkgm8:
I think you've got the right idea.....boost creep has crossed mine (and others') minds, too....and if my 3" TBE/Bellmouth is indeed large, relative to my TD04, then that makes it even more likely.

And thanks for the 'porting wastegate' option...didn't know that could be done!

Thanks
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Old 02-08-2009, 08:16 PM   #8
94 GT
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silver (grey soon!!)

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what turbo is stock on the 22T????
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Old 02-08-2009, 08:52 PM   #9
Yia
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Quote:
Originally Posted by 94 GT View Post
what turbo is stock on the 22T????
vf-11
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Old 02-09-2009, 07:00 PM   #10
blkgm8
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02 6 Speed Bugeye

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Lets get a Tdo5 16g with wastegate mod on that thing.
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