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Old 05-01-2010, 10:38 PM   #1
Equilibrium Tuning
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Default 07 WRX - Blouch DOM 3 8cm housing vs. 10cm housing!

I'll start out by eating my words a bit . I had previously posted that the 10cm housings that Blouch is using seemed to add too much lag without any real power advantage. This was based on all the results I had seen posted with the turbo but I hadn't had a chance to do a true comparison until now.

The car in question is an 07 WRX. I tuned this car about a year ago with the same setup but with the original DOM 3.0R with 8cm housing. The housing started cracking, so the customer sent it in to Blouch for repairs. They covered the issue under warranty and replaced the exhaust housing with one of their new 10cm housings. The rest of the turbo was untouched, so this is not a true XTR model. The results showed about a 300-400RPM increase in boost threshold and a 28whp gain. With the 10cm housing I was still able to get full boost by about 3700RPM and torque peak is still just past 4000RPM. This is much better than a lot of the results I've seen previously, so I was pleasantly surprised with the outcome. There is definitely a difference in spool and transient response with the larger housing, but its not nearly as big of a difference as most of the results have shown to date. This turbo performed almost identically to the ATP3076. It would be very interesting to see another comparison with the XTR wheel.

Here's the info and chart:

Event: Custom Tune/Road Dyno
Location: Equilibrium Tuning - Fairfield, CA
Ambient Temp: 75 degrees Fahrenheit
Elevation: ~180ft above sea level

Car: 2007 Subaru WRX
Tuner: ED @ Equilibrium Tuning
Peak HP at RPM: 352whp @ 7000RPM
Peak Torque at RPM: 325ft-lbs @ 43000RPM
Target Boost: 19.5psi Peak
Fuel: Cali 91 Octane

Engine/Power Modifications:

Blouch DOM 3.0R 10cm housing (non-XTR)
Catless TBE
APS 70mm CAI
Perrin Inlet/MAF hose
Hallman MBC
Walbro
DW750cc injectors
E-Bay TMIC
EQ Custom Tune



Here is the chart from todays tune:



And here is the overlay with the previous tune with the 8cm housing:


*** Standard Dyno Chart Disclaimer ***

This software reads low and should be compared to the lower reading mustang dynos. Here are some proven numbers and trap speeds for reference:

Stock WRX - 155-165whp
Stock STI - 215-225whp

265-275whp - 107-108mph traps
300-310whp - 112-113mph traps
325-335whp - 115-116mph traps
380-390whp - 122-123mph traps

Thanks
-- Ed
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Old 05-02-2010, 09:36 AM   #2
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.......

Last edited by stidoc; 05-07-2010 at 05:46 AM.
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Old 05-02-2010, 01:04 PM   #3
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Quote:
Originally Posted by Equilibrium Tuning View Post
I'll start out by eating my words a bit . I had previously posted that the 10cm housings that Blouch is using seemed to add too much lag without any real power advantage. This was based on all the results I had seen posted with the turbo but I hadn't had a chance to do a true comparison until now.

This is much better than a lot of the results I've seen previously, so I was pleasantly surprised with the outcome.
Isnt it weird after looking at all the results?

Im not getting what we're doing different than the other tuners. Maybe its just from using the hallman and the other tuners all have really conservative turbo dynamics mapping?
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Old 05-02-2010, 01:12 PM   #4
02WRX2.5
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Maybe cause your tuning on Public Roads, creates different loads than on the dyno so of course your plot is going to look different.
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Old 05-02-2010, 01:32 PM   #5
Phatron
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even when comparing dyno results of gt30 range turbos all the 10cm results have been very laggy
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Old 05-03-2010, 12:14 PM   #6
Equilibrium Tuning
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Quote:
Originally Posted by Phatron View Post
Isnt it weird after looking at all the results?

Im not getting what we're doing different than the other tuners. Maybe its just from using the hallman and the other tuners all have really conservative turbo dynamics mapping?
Its very strange. I guess the MBC is just helping that much with these larger turbos?

-- Ed
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Old 05-03-2010, 12:16 PM   #7
Equilibrium Tuning
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Quote:
Originally Posted by 02WRX2.5 View Post
Maybe cause your tuning on Public Roads, creates different loads than on the dyno so of course your plot is going to look different.
Sure, doing pulls on a real road can create different loads, but that just means the dyno operators need to adjust their settings to get a more accurate representation of real world loads. That being said, I've also seen road dyno plots show similar very laggy results.

-- Ed
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Old 05-04-2010, 09:32 AM   #8
02WRX2.5
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Quote:
Originally Posted by Equilibrium Tuning View Post
Sure, doing pulls on a real road can create different loads, but that just means the dyno operators need to adjust their settings to get a more accurate representation of real world loads. That being said, I've also seen road dyno plots show similar very laggy results.

-- Ed
Right on it just seem obvious to me, but i think your idea about the MBC is spot on, with my experience there is nothing better then MBC. Keeping it very simple = very fast.
Matt
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Old 05-04-2010, 01:21 PM   #9
Equilibrium Tuning
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Quote:
Originally Posted by 02WRX2.5 View Post
Right on it just seem obvious to me, but i think your idea about the MBC is spot on, with my experience there is nothing better then MBC. Keeping it very simple = very fast.
Matt
Yep. I've worked extensively with just about every type of boost control currently on the market and I keep coming back to the good old Hallman MBC for its response, stability, and consistency that is just unmatched by anything else I've worked with.

-- Ed

Last edited by Equilibrium Tuning; 05-06-2010 at 10:51 PM.
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Old 05-04-2010, 01:28 PM   #10
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I would love to see this turbo on E85 and 25-27psi, 450whp???
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Old 05-04-2010, 02:08 PM   #11
Equilibrium Tuning
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Originally Posted by juanmedina View Post
I would love to see this turbo on E85 and 25-27psi, 450whp???
I'd probably expect around 430-440whp out of it if we maxxed it out on E85 .

-- Ed
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Old 05-06-2010, 07:53 PM   #12
Equilibrium Tuning
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bumpin up. I thought people would be more interested in this comparison as its the most direct 8cm vs 10cm comparison I've seen to date .

-- Ed
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Old 05-06-2010, 08:28 PM   #13
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yeah. people biatch about doing them....then dont care once they're done.

its nothing really surprising though....
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Old 05-06-2010, 09:38 PM   #14
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This is one of those threads that I wanted to see. My interpretation of the 10cm housing was pretty much just as Ed had said. Most previous threads showed pretty dismal spool, and I had pretty much written off the 10cm housing.

Unfortunately well backed up comparisons like this don't really warrant a whole lot of comment. It's all there. It's not that we don't care, it's that nothing more really needs to be said. (Except, thanks Ed)
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Old 05-06-2010, 10:52 PM   #15
Equilibrium Tuning
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Quote:
Originally Posted by Concillian View Post
This is one of those threads that I wanted to see. My interpretation of the 10cm housing was pretty much just as Ed had said. Most previous threads showed pretty dismal spool, and I had pretty much written off the 10cm housing.

Unfortunately well backed up comparisons like this don't really warrant a whole lot of comment. It's all there. It's not that we don't care, it's that nothing more really needs to be said. (Except, thanks Ed)
I guess if there's no drama the thread dies. I'll try to include some controversial results next time.... boost leak anyone?

-- Ed
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Old 05-06-2010, 11:01 PM   #16
C J
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I wish I had the funds to play with a badass new turbo like this, awesome results. Now lets see it on some E85 or C16 please.
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Old 05-07-2010, 12:03 AM   #17
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There's a boost leak noted about 1800rpm

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Old 05-07-2010, 12:09 AM   #18
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Quote:
Originally Posted by modaddict View Post
There's a boost leak noted about 1800rpm

you detected a boost leak before the pull even began... you MUST be good

-- Ed
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Old 05-07-2010, 12:11 AM   #19
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Quote:
Originally Posted by Equilibrium Tuning View Post
you detected a boost leak before the pull even began... you MUST be good

-- Ed
Your VTEC crossover point is too soon also.
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Old 05-07-2010, 12:24 AM   #20
Phatron
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Default 07 WRX - Blouch DOM 3 8cm housing vs. 10cm housing!

bazinga
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Old 05-07-2010, 09:57 AM   #21
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Hey Ed thanks for posting this. I have had a 8cm dom3 for some time now. Ive been playing with the idea of swapping out to the 10cm housing, but I was affraid of it being too laggy, because I do a lot of autox etc... But I always wish it had some more top end on the street, the track etc.

Seems to be worth it to me.
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Old 05-07-2010, 11:59 AM   #22
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Hm, wish it was an XTR model. I have a Dom4 that might need to get sent in.
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Old 05-07-2010, 12:13 PM   #23
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Quote:
Originally Posted by Equilibrium Tuning View Post
There is definitely a difference in spool and transient response with the larger housing, but its not nearly as big of a difference as most of the results have shown to date. This turbo performed almost identically to the ATP3076.

It should perform almost identically to the ATP with the 10cm housing. The ATP housing is ~10cm itself so now the only difference between the two would be the compressor cover.
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Old 05-07-2010, 12:29 PM   #24
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Concillian is right on the money. I was glad you posted this, but there really isn't much else to say about it. Thanks for taking the time to share.
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Old 05-07-2010, 01:55 PM   #25
Equilibrium Tuning
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Quote:
Originally Posted by kellygnsd View Post
It should perform almost identically to the ATP with the 10cm housing. The ATP housing is ~10cm itself so now the only difference between the two would be the compressor cover.
Yep that's true. They're very similar turbos at this point.

-- Ed
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