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Old 05-09-2004, 01:17 PM   #1
AaronB
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Forester 100% stock FXT Automatic Dyno Results

I put my wife's Forester XT on the dyno (Dyno Dynamics) yesterday to get a 100% stock baseline. It is an 04 XT Premium with 1920 miles. No modifications, running 91 octane gas.

Some interesting notes:
  • a stock WRX 5 speed went right before me and put down 160 whp which is right at the shops average for this type of dyno.
  • a stock WRX automatic typically puts down around 140 whp on this type of dyno.
  • They hadn't done a FXT 5 speed yet for me to compare it to
  • First graph is wheel horsepower and torque
  • Second graph is boost and air fuel ratio



Just wanted to share the info in case anyone finds it interesting...

Regards,

Aaron
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Old 05-09-2004, 01:29 PM   #2
Peaty
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Good info Aaron can you post that on the Scoobymods site in the and I can move it to the Forester section?
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Old 05-09-2004, 01:38 PM   #3
Glass Man
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Thanks Aaron!!!

Just curious - what gear were the runs made in???
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Old 05-09-2004, 01:42 PM   #4
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I put it on ScoobyMods here... http://www.scoobymods.com/forums/showthread.php?t=3556

I willhave to try and find out what gear it was made in, I didn't think to ask...
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Old 05-09-2004, 01:48 PM   #5
Peaty
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Cool,

Wish we had a 4wheel dyno around here that I could get to easly.
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Old 05-09-2004, 07:20 PM   #6
LtleBlkBox
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So what was the average whp? It appears to be a little over 150 whp, is that right? What would that translate to at the engine?
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Old 05-09-2004, 08:33 PM   #7
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I don't have the average. The peak was 158 whp on one of the runs. Since a WRX Automatic puts down 140ish whp on this dyno, and it is rated at 227 horsepower, either the Forester has a more efficient drivetrain or it puts out about 10-15 horsepower than the WRX is rated at.

My results also cooresponds to what Shiv at Vishnu found when he did a 5 speed XT on his Dyno Dynamics dyno. He normally sees 160ish on WRX 5 speeds, and he saw 175 whp on a XT 5 speed that he posted about before.

My personal opinion is that the Forester motor puts out more power than advertised. I think there is quite a bit of potential in there for some impressive numbers with the basic staged upgrade packages like the WRX.

Regards,

Aaron
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Old 05-10-2004, 12:11 AM   #8
Chromer
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There is some interesting stuff on those plots. Thanks for posting them.

I find it interesting that the first run (red) is so very different than the other two. Boost came on sooner and it ran much leaner than the other two runs.

The other notable thing about the runs is how the A/F ratio changes at 5100 rpm. I wonder if the XT ECU is runing closed-loop at WOT up until that RPM?

But on the red run even past 5100 RPM it was leaner than the other two runs. You don't happen to have a timing plot, do you? I'd be very interested to see if the ECU is doing the over-aggressive advance-authority-then-retard thing that the first batch of STI's was doing...
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Old 05-10-2004, 12:24 PM   #9
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So, can any of you graph genius guys put the MT Dyno (http://forums.nasioc.com/forums/show.../t-436629.html) together with these results to say anything about how the HP/Torque of FXT MT and AT compare ??

Bob

PS: Thanks for the data Aaron. I've put it up at: http://autos.groups.yahoo.com/group/foresterxt
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Old 05-10-2004, 12:47 PM   #10
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Quote:
Originally posted by LtleBlkBox
So what was the average whp? It appears to be a little over 150 whp, is that right? What would that translate to at the engine?
I spoke with Richard Garcia (president of Dyno-Comp where Arron dyno'd his FXT) previously. He said that the 4eat drive train has a loss typically around 30%. Based on that information at a peak run of 158 whp, it is putting out about 227 HP at the flywheel. I wonder if he (Richard) was reffering to a 4eat of a wrx having 30% drivetrain parasitic loss.
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Old 05-10-2004, 12:54 PM   #11
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Quote:
Originally posted by AaronB
I put it on ScoobyMods here... http://www.scoobymods.com/forums/showthread.php?t=3556

I willhave to try and find out what gear it was made in, I didn't think to ask...
I've seen other threads state that the 4eat needs to be run in second gear on the dyno, can't remember the reasoning though.
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Old 05-10-2004, 06:23 PM   #12
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Quote:
Originally posted by Chromer
The other notable thing about the runs is how the A/F ratio changes at 5100 rpm. I wonder if the XT ECU is runing closed-loop at WOT up until that RPM?

But on the red run even past 5100 RPM it was leaner than the other two runs. You don't happen to have a timing plot, do you? I'd be very interested to see if the ECU is doing the over-aggressive advance-authority-then-retard thing that the first batch of STI's was doing...
Richard said it was a OBD-3 thing, where full throttle has to be held for 3 seconds before it switches fuel maps... I found it very strange as well.

No timing plots sorry.
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Old 05-10-2004, 07:43 PM   #13
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Since weather, altitude, and the dyno itself all vary, I think we can draw the biggest conclusion from the fact that on THIS dyno, the Forester XT auto put out an average of about 155 vs. the typical WRX auto at 140.

Regarding parasitic losses. I would estimate lower losses from the XT's Active All-Wheel Drive system than the WRX's Variable Torque Distribution. The VTD system has a lot more parts spinning around to use up energy than the XT system with the transfer clutch. (OTOH I'd really like VTD)
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Old 05-11-2004, 12:28 PM   #14
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Quote:
Originally posted by jimqpublic
Since weather, altitude, and the dyno itself all vary, I think we can draw the biggest conclusion from the fact that on THIS dyno, the Forester XT auto put out an average of about 155 vs. the typical WRX auto at 140.
I agree 100% That was what I was hoping to share.
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Old 05-16-2004, 11:41 PM   #15
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For the Dyno-Challenged (me), what does all of this mean? I am considering trading in my auto XS for an auto XT. How will the XT auto compare to my wife's WRX auto?
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Old 05-17-2004, 12:55 AM   #16
nitrohuffer
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Quote:
Originally posted by tnedator
For the Dyno-Challenged (me), what does all of this mean? I am considering trading in my auto XS for an auto XT. How will the XT auto compare to my wife's WRX auto?

XT>WRX.
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