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Old 08-31-2010, 01:09 PM   #1
cireturbo
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Default 06 Saabaru 18G-XT 341whp/326wtq on an Uncorrected DynoJet.

Event: Dyno Pull
Location: P&L Motorsports (Chicago, IL)
Ambient Temp: 95 degrees Fahrenheit
Elevation: 600 feet
Weather: Hot, 36% Humidity
Tires: 245/40/17 RE-01R Tires

Car: 2006 Saab 9-2X Aero (2.5L)
Tuner: Jorge
Dyno Info: DynoJet
Transmission: 07 STI 6 speed
Gear: 3rd
Peak HP at RPM: 341.5 Uncorrected
Peak Torque at RPM: 326.30 Uncorrected
Baseline hp/tq for a stock on same dyno: ~210-220whp (Stock STI)
Target Boost: 20psi tapering to 18psi
Target AFR: 12.0
Fuel: 93 Octane from Shell (Sitting in the tank for over 2 weeks)

Power Mods:
EJ255 w/
100mm CP Pistons (~8.8 CR)
ACL Bearings
ARP Headstuds
GSC S1 Cams (266/266)
Supertech Valvetrain

Blouch 18G-XT 8cm (Coated Exhaust Side)
Spearco TMIC
Tial 44mm External Wastegate
GT-Spec Headers and Uppipe (Wrapped)
TurboXS 4" Downpipe (Wrapped)
P&L Street Exhaust
TGV Deletes
P&L HiFlo Intake
Samco Turbo Inlet
GM BCS
Deatschwerks 850cc Injectors
Walbro 255lph Fuel Pump

Drivetrain Mods:
Exedy HD Clutch
OEM Flywheel
Kartboy Short Shifter and Bushings
Group N Engine and Transmission Mounts

Suspension Mods:
Endura-Tech Coilovers
Whiteline Front and Rear Sways w/ Kartboy Endlinks

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Last edited by cireturbo; 08-31-2010 at 01:18 PM. Reason: Graph added.
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Old 08-31-2010, 01:39 PM   #2
WMCCook29
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Why only a 3rd gear pull, shouldn't it have been in 4th with the 6 speed?
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Old 08-31-2010, 02:15 PM   #3
cireturbo
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Hot day, static air. But yes, it would have made a bit more power and spooled sooner in 4th.
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Old 08-31-2010, 02:18 PM   #4
mashedpaters
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07 6 speeds have longer gears, more like the 5 speed.
numbers look good OP
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Old 08-31-2010, 10:21 PM   #5
KurtP
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hows it feel?
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Old 08-31-2010, 10:42 PM   #6
Mooneyes13
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id pass on the 18g....
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Old 08-31-2010, 11:32 PM   #7
autowagon
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Quote:
Originally Posted by Mooneyes13 View Post
id pass on the 18g....
my sentiments exactly, opposite. the 18g isn't the 18g anymore. These new big wheels and hotsides change things a little. For example the 16gxt is supposed to be 42lbmin ( old 20g is 44lbmin) and the 16gxt is the one that you can't get the 10mm hot side on. Last year's popular opinion that the 2.5 engine needs at least an 18g at the very least if upgrading from stock, i think things have changed. These new units are more efficient (i suspect) and bigger. The Ratio of flow from the compressor to the turbine has gotten smaller, and the size of both has grown.
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Old 09-01-2010, 01:39 AM   #8
cireturbo
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I'm starting to suspect a boost leak, it's spooling at least 700rpm slower than my TD05 20G 8cm did.

It's a billet 43 lb/min wheel, where as the 20g was a standard 44 lb/min.
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Old 09-01-2010, 01:59 AM   #9
socalLGT
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I've been saying this for a while now, but the new "miracle" billet wheel turbo are more hype than anything else. 341whp on a cammed motor with an EWG and with full boost after 4000rpm is nothing special at all. As the OP has already noted his old 20G spooled better I typically see similar power with 20G's running IWG on stock motors.

They are simply bigger comp wheels. They make more power than their "old" namesakes but spool slower. Wow... the laws of physics are actually real ?!? Whodathunkit?
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Old 09-01-2010, 02:08 AM   #10
cireturbo
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Quote:
Originally Posted by socalLGT View Post
I've been saying this for a while now, but the new "miracle" billet wheel turbo are more hype than anything else. 341whp on a cammed motor with an EWG and with full boost after 4000rpm is nothing special at all. As the OP has already noted his old 20G spooled better I typically see similar power with 20G's running IWG on stock motors.

They are simply bigger comp wheels. They make more power than their "old" namesakes but spool slower. Wow... the laws of physics are actually real ?!? Whodathunkit?
For the 20G-XT that makes sense, but why would a smaller billet wheel be making roughly the same power but spool slower? I wasn't expecting anything magical, just wanted around the same spool.
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Old 09-01-2010, 02:50 PM   #11
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Couldn't find any boost leaks, no cracks or leaks in the exhaust either.

Anyone want to take a wild guess why this turbo is spooling nearly 1,000rpm slower than my TD05 20g 8cm did?
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Old 09-01-2010, 02:52 PM   #12
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Nice power. Wish I made that much.
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Old 09-01-2010, 03:04 PM   #13
stidoc
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Rare is the Blouch billet wheel turbo that doesn't spool late, sad but true, even the small ones. You even have all the "right" mods for earlier spool. They do make good power though, you just have to wait for it.
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Old 09-01-2010, 03:19 PM   #14
cireturbo
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Quote:
Originally Posted by stidoc View Post
Rare is the Blouch billet wheel turbo that doesn't spool late, sad but true, even the small ones. You even have all the "right" mods for earlier spool. They do make good power though, you just have to wait for it.
According to Blouch it should be spooling in the 3-3.5K range, and I've seen another dyno where an 08 STI (FMIC and catted) makes peak torque around 3200.

Compared to my Blouch TD05 20g 8cm, I picked up maybe 10 horsepower on the top end but don't think it was worth the delay in spool. If something is mechanically wrong with the turbo it'd be an easy explanation, but if it's working properly and spools like this I'm quite disappointed by it.
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Old 09-01-2010, 03:21 PM   #15
Dave D.
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Quote:
Originally Posted by cireturbo View Post
Couldn't find any boost leaks, no cracks or leaks in the exhaust either.

Anyone want to take a wild guess why this turbo is spooling nearly 1,000rpm slower than my TD05 20g 8cm did?
Here's my wild guess: hotter cams move power curves to the right.
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Old 09-01-2010, 03:27 PM   #16
cireturbo
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This exact same setup was spooling a TD05 20g 8cm well before this 18G-XT 8cm. On the road in the 3rd gear it would hit 17psi by 3100 rpm (with a 5 speed). Currently on the road in 4th gear (07 6 speed) it's not spooling till almost 4000 rpm. Obviously weather and humidity are partly to blame, but is it possible for those two variables to affect spool by 700 rpm?

Again, only changes were the turbo and 6 speed. Everything else has remained the same.
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Old 09-01-2010, 03:30 PM   #17
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subscribed
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Old 09-01-2010, 04:24 PM   #18
Blouchturbo
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Spool looks slow for the 18G-XT. I added some graphs from EFI Logics tuning the 18G-XT.



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Old 09-01-2010, 05:16 PM   #19
Dave D.
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Torque seems relatively low for a 2.5 in comparison to hp. Usually it's reversed. I can't imagine your tuner would turn down the torque for your built setup. Seems weird.

Also, I think it's strange (looking at the graphs) that a built motor running E85 and FMIC does not kick ass on the much more stock pump gas setup -- a few more hp, and a lot less tq!

Maybe you should try a 10cm^2 hta68.
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Old 09-01-2010, 05:28 PM   #20
Fierysun
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Why is the OP dyno graph/pull uncorrected?
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Old 09-01-2010, 05:47 PM   #21
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Quote:
Originally Posted by Fierysun View Post
Why is the OP dyno graph/pull uncorrected?
Because the chart is from P&L and they always report uncorrected numbers.

Corrections are more for N/A, They tend to "over-correct" turbo cars. RiftsWRX (Jorge) has comments throughout PPB about his take on the corrections, no need to re-hash.
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Old 09-01-2010, 11:37 PM   #22
Zer0shift
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I have seen a 500 rpm differents in spool from a 3rd to 4th gear pull on an 07 STi with a GT30R. But still for a 18g with a build engine and higher comp pistons.
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