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Old 12-20-2007, 02:14 AM   #1
PDXTuning
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Default PDXTuning Tuned 2008 STI

As with the 2008 WRX, PDXTuning has been looking forward to tuning the new 2008 STI. As most on Nasioc know, we strive to lead the pack in both innovation as well as technical know-how. The pack starts here, today, with the new 2008 STI. We acquired our 2008 STI on Monday, and after a quick 200 miles of break-in we put it thru the paces.

Currently the only available option for tuning this new beast was the UTEC Delta and the just being released Accessport. The fine folks at TurboXS overnighted us a Delta for this test, so we jumped on it. The UTEC Delta is the latest iteration in the long line of UTEC products, and is a plug and play application. For this tune, we used the Open Loop Fueling option which allows the UTEC complete control of the fueling and timing. At a later date we will return to the UTEC and run a Speed Density tune for comparison. We will have an Accesport tune as well, coming up by the end of this week.

Since the UTEC acts like a partial piggyback, the stock ECU is still in control of the drive-by-wire throttle, as well as the AVCS. The AVCS on the new 2008 STI works on both the intake and exhaust cam, allowing unprecedented tweaking of valve overlap and lobe separation angle. Once the full potential of tuning those parameters is realized I expect to see some very interesting gains.

To start off, let’s take a look at the bone stock STI. We filled the tank with fresh Oregon 92 (Winter oxy mix) and strapped it down to the dyno.

After several runs, we found the following:

(1) The stock ECU still has the 07 Closed Loop Delay, which results in 14:1 AFRS until almost 4000 rpm, followed by 9.9:1 AFRs to redline. During the lean closed loop section, the stock ECU runs very little timing, which retards low end torque significantly.

(2) After having driven the car for about 200 miles on 92 Octane, the car felt significantly faster than it did right off the show room floor. I did an ECU reset at about 140 miles, and the following learnup on the road made a significant difference. This car seems to be very octane sensitive, and I imagine power on 91 octane will be down a bit.

None the less, we were able to get a repeatable 250-255 whp and 260 lb-ft of torque. Typical 07 STIs on our dyno are in the 245-250 range, and 04 STIs in the 235-240 range. With the right fuel and a happy ECU, the 08 seems to make good power. These were 4th gear runs on our Mustang Dyno. As an aside, the Perrin car shows 220-240whp and 270 torque on the Dynapak, but in 5th gear. As we know when we had that dyno, you will loose top end HP in 5th gear, and gain low end torque (especially on the Dynapak due to the holding load before the run starts).



To get an idea what the ECU is doing, here is a datalog courtesy of Deltadash:



Next we added the UTEC to the mix, leaving everything else on the car the same. With a quick tune of the boost, AFRs set for about 11:1, and a much more normal timing curve we pulled 273whp and 326 lb-ft of torque.
That is much more like it should be!



Here is a quick look at the datalog from the UTEC tuned run. *UPDATED* Boost was peaking about 20psi, but falling at redline down to stock levels. Timing, as mentioned above was much much better, and AFRs were right at 10.9-11.0:1.



We the took the car off the dyno and installed a Legacy downpipe, which fit with only minor tweaks.

Running only slightly more boost (*22PSI) in the midrange, we were able to extract 282whp and 343lb-ft of torque. And this is with the STOCK mufflers! The car is nearly as quiet as stock, but pulls like a loud stage 2 STI!

Take a look:


Looking at the datalog, you can see boost peaked at 22psi*UPDATED* , and fell at redline like stock. I suspect the redline boost could have been increased, but only for a small gain in peak HP. With a real Stage 2 catless complete exhaust I suspect wheel HP of 300-315 will be possible.



For comparison sakes:

Here is the STOCK compared to the UTEC only:



Here is the STOCK compared to the UTEC PLUS DOWNPIPE:


All Three in the mix


UPDATE: After some playing around, we have discovered that the MAP sensor is slightly different then previous years. As a results, while the UTEC presented a peak of 20psi in the high power map, it was really a bit closer to 22psi. We will recalibrate the UTEC to the logs are correct.

None the less, it is surprising how well the car responds to 22psi. Very happy indeed!
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Last edited by PDXTuning; 12-21-2007 at 08:07 PM.
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Old 12-20-2007, 02:14 AM   #2
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and last, a clean torque comparison


For those curious about boost levels, here is a compare of the boost levels as measured by the UTEC (Note the UTEC and Deltadash boost numbers did not agree for the stock runs. I'm not sure the UTEC or DD is correct, and will investigate further)



There is a lot more to say about the tune, engine, etc, and I will fill in those details tomorrow. I just figured everyone would like to see what the 08s are capable of on a first pass. There is much more good stuff to come.

Jeff Sponaugle
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Old 12-20-2007, 02:16 AM   #3
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first post! Nice work guys!
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Old 12-20-2007, 02:18 AM   #4
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Hold for some more data..
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Old 12-20-2007, 02:18 AM   #5
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Great information Jeff.
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Old 12-20-2007, 02:32 AM   #6
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can you throw up a timing plot of all three on the same graph? RPM 1500-7000..

And maybe an AFR plot of all 3

was it knocking on the stock map on all the runs?

Also, what was the IAM at on the stock map runs?

Thanks
Ron
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Old 12-20-2007, 02:35 AM   #7
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Quote:
Originally Posted by Phatron View Post
can you throw up a timing plot of all three on the same graph? RPM 1500-7000..

was it knocking on the stock map on all the runs?

Also, what was the IAM at on the stock map runs?
Will do... No idea on IAM, as DD didn't show it. Learned Corrections were high, so the ECU was happy most of the time. It was relativly cool here, and the Oregon 92 is pretty good gas. There were some runs seemed weaker in the lower rpm region, but I didn't hear any audible knock on the stock map. I suspect 91 octane or a hot day might be a different situation.

Needless to say, the stock tune SUCKS!

Jeff

Last edited by PDXTuning; 12-20-2007 at 02:47 AM.
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Old 12-20-2007, 02:36 AM   #8
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Wasnt it knocking at 3600 and 4400? based on the pulled timing....looks like a couple -4.22 FBKC...
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Old 12-20-2007, 02:45 AM   #9
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Quote:
Originally Posted by Phatron View Post
can you throw up a timing plot of all three on the same graph? RPM 1500-7000..


AFR will take some work, as I used the AFR on the dyno, not a tuna.

Jeff
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Old 12-20-2007, 02:45 AM   #10
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Space
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Old 12-20-2007, 02:47 AM   #11
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Quote:
Originally Posted by Phatron View Post
Wasnt it knocking at 3600 and 4400? based on the pulled timing....looks like a couple -4.22 FBKC...
I would think so based on the graph, but without looking at the actual tables it is hard to say. There was no audible det at all, but the timing it was trying to run was pretty high....

Look at our tuned line vs their line... It looks like timing was pushed much higher and then pulled back in. I'll dig thru some other logs, but most of the runs seems to have some pretty wavy timing stock. It seems like the map is programmed with some very high advance, and relies on some KCs to pull it down.

You can see the torque changes from that pull. On the road, I can feel them as well.

Jeff
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Old 12-20-2007, 04:28 AM   #12
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Wow, the 08 responds well to simple mods!!
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Old 12-20-2007, 04:41 AM   #13
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300+ WTQ on a stock 08 STI on a mustang dyno...anyother day i would call bs. But i dont know jack about the new engine or ecu...WOW...could there be 400wtq with a catback and intake?
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Old 12-20-2007, 06:33 AM   #14
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Very nice! Great job as always! Seems like your strategy (a little break in, a few tanks of fresh 92 octane gas plus the ECU reset) worked. This baseline graph looks much better. As long as the car have a little more power than the 07... those 305 BHP SAE seem to be real while the torque is still way underrated. The stock logs are interesting, Man that tune sucks!

Looking forward to see the changes dual AVCS have on a modified car (stage 2 and beyond). Any guess on the turbo? Is it a IHI or a Mitsu?
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Old 12-20-2007, 06:59 AM   #15
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I am completely blown away with the timing map of the stock ECU.

Not only that, I'm also astonished at the timing values that both stock and PDX run. I only WISH I could run timing like that.

C16 maybe?
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Old 12-20-2007, 07:07 AM   #16
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This looks promising. 300whp seems possible with just stage 2!!
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Old 12-20-2007, 08:14 AM   #17
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Any chance of doing something like this on your 2008 WRX? Would like to see those results as well.
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Old 12-20-2007, 08:14 AM   #18
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great write up Jeff.....def. subscribed for some more results
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Old 12-20-2007, 08:41 AM   #19
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nice...
Quick Question...

Is the dip at 3600 where the AVCS transitions?
also...WTH is up with the stock Timing map...

Looks promising...
might be my new BSP mount to give the EVO's something to worry about..
do you think it will be faster than Navid's SM Car at some point..

Bill
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Old 12-20-2007, 08:54 AM   #20
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Looks about the same as an older STi. I made 306whp and 342wtq on my 05 with a TBE at 20psi on a dynojet. Throw in a Mustang, seems about right as before. I guess the new turbo still isn't much to write home about and will need to be upgraded. Thanks for the info, Jeff.
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Old 12-20-2007, 10:06 AM   #21
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I'm not too surprised by the stock IGN timing. It was probably trying to advance to the optimal timing on 93 octane after the reset.

Either way those are great result! Thanks for the informative posts!
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Old 12-20-2007, 10:24 AM   #22
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good stuff jeff..

dave/mspt
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Old 12-20-2007, 10:33 AM   #23
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Quote:
Originally Posted by Cyni View Post
Any chance of doing something like this on your 2008 WRX? Would like to see those results as well.

Here is the post we made about the WRX when we first got it.

http://forums.nasioc.com/forums/show....php?t=1320836

We will do some more with it in the near future as parts are becoming available for them.
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Old 12-20-2007, 10:36 AM   #24
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Quote:
Originally Posted by Scooby South View Post
nice...
Quick Question...

Is the dip at 3600 where the AVCS transitions?
also...WTH is up with the stock Timing map...

Looks promising...
might be my new BSP mount to give the EVO's something to worry about..
do you think it will be faster than Navid's SM Car at some point..

Bill
BSP#93
We were looking at AVCS on both cams during the pulls and it did not appear to correspond to anything we were seeing on the graph. Once we complete some testing with alterations to the AVCS tables we will have a much better idea of how changes to both tables display on the dyno graph.

These cars have a TON of potential! I am sure Navid will give this one a spin through the cones to see how fast it really is. He drove one a couple weeks ago and had positive things to say about it bone stock.

Jarrad
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Old 12-20-2007, 10:42 AM   #25
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Quote:
Originally Posted by twiSTies View Post
Looks about the same as an older STi. I made 306whp and 342wtq on my 05 with a TBE at 20psi on a dynojet. Throw in a Mustang, seems about right as before. I guess the new turbo still isn't much to write home about and will need to be upgraded. Thanks for the info, Jeff.

First, this is not a complete turbo back, this is only a down pipe. Second, not all dynos are equal so comparing another dyno to this one, even with generalzations about brands, is useless. As Jeff posted this car is stronger bone stock than any other STi we have put on our dyno. With just a down pipe and tuning we are already seeing more torque than any STi with a full turbo back to date. With just the DP we are beating out the average 04-06 STi with a full turbo back. Driving it on the street with the traction control turned off is silly fun. It may appear like the older STi, but if you look at the details you will see these are definatly faster than past years, and we are just getting started.

Jarrad
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