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Old 03-18-2003, 08:13 AM   #1
mtb_dude
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Member#: 12619
Join Date: Nov 2001
Chapter/Region: Tri-State
Location: LI, NY
Vehicle:
02 WRX Wagon
#47 SM w/RA gears

Default Yet Another UTEC first Impressions Thread

Hey all. I installed my UTEC yesterday and I spent most of yesterday getting it setup. I'm running a stage 1 map with a basically stock drivetrain except a prodrive axle-back. I installed the ABC, but I'm literally like 3 feet above sea level, so I didn't think I would need it much.

Well, my first drive with the stage 1 map was just like most everyone else's. Low boost. Stopped off in a parking lot and turned it out two turns. Still only peaking at 14psi. I did another turn and a half and was getting the 16 psi at 4000 rpm. Now it was starting to feel good. I noticed the logs were only reporting 13 psi, and there's no reason for me to think my boost gauge was wrong, so my next step was to calibrate the MAP sensor to the UTEC. Since I was close to sea level (pretty much ON sea level really) I didn't think I'd need to, but i did. I took the pressure reading while idling (about -10.29 psi) and found the MAP value of about 73. Then I started logging again and drove around trying to get the peak boost of 16. So I ran a long log of #4 logger and noticed by boost gauge never went above .11Mpa so after I got my data into a spreadsheet, I just sorted the MAP values to find the peak (about 195). I considered that 16psi and found my gradient and intercept to be 216 and 260. (Default was 204 and 244). I'm a little shocked that I had to change them that much being at sea level, but after running another set of logs the MAP logs to almost exaclty what my boost gauge reads. Yes!

As for my impressions, the car is strong and you can really feel the advance when you punch the throttle, then the boost comes on . 5th gear is now drivable and the other gears are a true thrill. Sometime this week my summer tires will make their way on and I will start to test midcorner grunt, but one thing's for sure, brakes might need to be my next mod!

Oh by the way, not a single knock event on 93 octane. This map is perfectly safe IMO, and I'm sure I'll start to play with it soon! This is the easiest way to make 275 crank HP I've ever experienced!

I have pictures of my install. I'll post later.
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Old 03-18-2003, 01:59 PM   #2
02WRX_BLUE
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Location: Chester Springs, PA
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2006 EVO MR
Apex Silver

Default

Good review!

Actually, mine was reading +0.6 psi more (MAP) according to dashbaord. (You look at the dashboard while the key is on position, it should read close to 0 psi... but mine was reading +0.6 psi(absolute))

Anyhoo, I've logged through #4 log option and my values were M0 = 71 P0 = -9 psi M1 = 199 P0=15.805..

After adjusting the parameters, I saw 0 psi from the dashboard while the engine is turned off.. PERFECT!!!!!

Dan from PA.

Last edited by 02WRX_BLUE; 03-19-2003 at 09:16 PM.
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Old 03-18-2003, 06:02 PM   #3
nicktckhoo
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Is that the target? to get the MAP to read zero? or to match the boost gauge? I know the boost gauge may be off as well.

I think it makes more sense to have the MAP read zero when the engine is off. Mine reads -1 psi (abs) and the boost gauge reads that (-0.7 OR -0.8psi) as well. The problem with the factory gauge is the small markings. I do agree that 16psi or 0.11MPA is a good point to target though as it is easier to see.

What should I be doing?

Nick
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Old 03-18-2003, 08:54 PM   #4
mtb_dude
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#47 SM w/RA gears

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The farther apart the two points P1 and M1 are from P0 M0, the more accurate it should be. I noticed that normal idling (fan off) is almost exactly -0.7 MPa (-10.29 psi). Since this is only about 4 psi and change away from total vacuum, i thought that would be a good point since you can also easily repeat it. Like I said before, I have no reason to believe the stock boost gauge is inaccurate, in fact i heard when it's fairly new it's really accurate, so I tried to get the UTEC logger to match what i see on the gauge.

Yet another day on stage 1 and very happy.
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Old 03-18-2003, 10:18 PM   #5
02WRX_BLUE
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Apex Silver

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Quote:
Originally posted by nicktckhoo
Is that the target? to get the MAP to read zero? or to match the boost gauge? I know the boost gauge may be off as well.

I think it makes more sense to have the MAP read zero when the engine is off. Mine reads -1 psi (abs) and the boost gauge reads that (-0.7 OR -0.8psi) as well. The problem with the factory gauge is the small markings. I do agree that 16psi or 0.11MPA is a good point to target though as it is easier to see.

What should I be doing?

Nick
Nick: I replied to your post in the WRXHACKERS.com.

You don't really have to do it but the UTEC maps (where you input values in 2 dimensions) in general are based on the MAP values that UTEC reads from stock sensor. So, if your MAP reading is off by 1 psi, the values from your UTEC maps are applied by 1 psi off possibly.

Not a big deal but let's assume that the MAP UTEC read were 15 psi (Absolute) while actual pressure in manifold was 14 psi.
For argument purposes, that's say that 15 psi was the border line between 80% and 90% MAP colume of the UTEC MAPS for timing. It would read the 90% MAP colume 1 psi earlier than the actual manifold presure. If you had timing set at 20 in 80 MAP colume and 25 in 90 MAP colume, the UTEC will actually run 25 for timing at 1 psi below the target manifold pressure.

I hope this helps...

Dan from PA.
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