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Old 11-25-2007, 12:12 PM   #1
dynamix
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Member#: 122603
Join Date: Aug 2006
Default 3 port boost solenoid and mapping for it

I have sourced and fitted one of the Prodrive 3 port solenoids to see what the fuss was about. The prodrive version comes complete with a plug and play harness to connect to the subaru but for some reason isnt available in the uk.

I know a lot of you guys fit them or an equivalent UK sourced variety and hack the wiring looms.

Being a little dubious about the benefits I thought I would give it a go and mapped to it with the lower wastegate duty cycles needed for these. Also amended the Turbo Dynamics tables to stop it over-reacting on the boost control.

I have to say that I am quite impressed with the benefits.

Before, the boost would start dying at around 5k no matter what daft values were put in the wgdc and subsequently performance at the top would be less than sparkling. Now, it will hold boost better at the top. I havent noticed any benefit in spool up.

Now I know boost isnt everything, but logging of engine load, maf grams and other key parameters showed an improvement. Once I had finalised the map (if they are ever really finalised), I did a before and after comparison through DeltaDash using the same road, same weight of car (even though the after had slightly more fuel on board) so they are as near as dammit comparable.

In gear times:
was (on normal fuel)

3rd gear:
30 - 50 mph = 2.1 seconds
40 - 60 mph = 1.9 seconds
50 - 70 mph = 2.0 seconds
60 - 80 mph = 2.5 seconds

now (which is actually almost the same as the methanol testing)

3rd gear:
30 - 50 mph = 2.1 seconds
40 - 60 mph = 1.8 seconds
50 - 70 mph = 1.8 seconds
60 - 80 mph = 2.1 seconds

Dyno charts:

Runs done in 3rd gear, all in the same location.

I have always got slightly higher figures in 3rd gear (to do with the sample rate from the ecu) so I am taking the ultimate figures with a pinch of salt but the improvements are fairly plain to see.

Yellow line is 'before' and both red and blue are consecutive runs on the same track.

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Old 11-27-2007, 04:02 PM   #2
bboy
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Location: Seattle, WA
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04 Improved STI
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It definitely controls boost better especially with low poundage WGs.
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Old 11-28-2007, 03:24 AM   #3
dynamix
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I must admit I am impressed with the difference this has made with the std turbo and wastegate. I am looking into an uprated actuator at the moment rated at 1.2 bar as the last step before I give up on this turbo and move up to something capable of 450 bhp.
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Old 11-28-2007, 04:50 AM   #4
HndaTch627
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Location: Carol Stream, IL
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'01 GC8 Dinged STM
'09 Concours 14 ABS Black

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Quote:
Originally Posted by dynamix View Post
I must admit I am impressed with the difference this has made with the std turbo and wastegate. I am looking into an uprated actuator at the moment rated at 1.2 bar as the last step before I give up on this turbo and move up to something capable of 450 bhp.
what do those run on that side of pond? I was trying to find a 1.2 bar actuator for a VF-22 over here and everyone wanted just shy of $200 USD
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Old 11-28-2007, 04:58 AM   #5
dynamix
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I would very happily pay $200 for it with todays exchange rate ... if someone wants to ship one out to me.

Work out at 145 GBP ~ $290 here.
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Old 11-28-2007, 01:30 PM   #6
HndaTch627
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Location: Carol Stream, IL
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'01 GC8 Dinged STM
'09 Concours 14 ABS Black

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Quote:
Originally Posted by dynamix View Post
I would very happily pay $200 for it with todays exchange rate ... if someone wants to ship one out to me.

Work out at 145 GBP ~ $290 here.
ouch....and yeah the exchange rate is definitely working in your favor there. I figured with the amount of Subaru's over there you might have better access to off the wall parts like that.
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Old 11-29-2007, 01:26 AM   #7
dynamix
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I wish.

The trouble is that most of the stuff comes into the UK comes via US or Japan so costs normally include shipping and an extra bit of profit because home markets are a little tough for them.

And dont get me started on the cost of fuel - it makes me laugh you guys moaning about how expensive petrol is when we are currently paying $10 a gallon !!

Rip off Britain.

Still.... the modifications are worth it
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