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Old 01-23-2003, 01:54 AM   #1
Scooby Newbie
Member#: 5836
Join Date: Apr 2001
Location: Chicago, IL, USA
2002 fake STi
silver and pink

Question Dyno tuning the UTEC and/or ems in general

Hi Guys,

I am bringing my car in for dynoing...4wd dyno. for my stage 3 UTEC setup

How should I start to tune?

I am calling TXS tomorrow but would like to soon you guys out first.

Here goes..

step 1: do a baseline run in 3rd gear to make sure that everything is ok with the engine...check HP, torque, boost, wideband A/F ratios and IDCs....

step2: assuming everything in step 1 is ok. start reducing fuel across fuel map (rpm range) by the smallest increments keeping the values constant across the MAF % readings. when knock is detected at any point in the rpm range start adding back fuel. My question is this way I am basically tuning for WOT and assuming that the fuel settings are safe for part throttle (>60% but <100%)condition. Don't we all drive at WOT?

Or do I do the above fuel reductions and keep an eye on A/F ratios...once it goes above 11, stop and add back fuel at that particular rpm? Better yet, monitor both simutaneously?

step3: start increasing timing across the rpm range evenly by 1 degree. no knock ...proceed by another degree. once knock is detected... note rpm where knock occurred??? Is that possible since I am flooring it?

Is my approach correct? I am assuming the shape of the fuel map and the timing map to be optimal and this may be a wrong assumption. If so How do I tune at specific rpm points? Wouldn't that require an inordinate amount of runs?

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Old 01-23-2003, 12:07 PM   #2
Scooby Specialist
Member#: 13704
Join Date: Dec 2001
Location: Chester Springs, PA
2006 EVO MR
Apex Silver


I would do the same...

UTEC logs do not provide AFR data enough to tune.. So, I would check and adjust the FUEL map.. (But, you should have a specific boost curve in mine so that AFR will be consistant).

I would not run more than 16 PSI with the STOCK turbo. So, I would create FUEL map for 16 psi and another one for 18 PSI (for drag racing and stuff).

As you said, I would do TIMING next to see if you can advance a little with the help from TMIC...

After you are done! Can you send me a copy of map to my email address? : )


Dan from PA.
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Old 01-24-2003, 03:14 AM   #3
Scooby Newbie
Member#: 5836
Join Date: Apr 2001
Location: Chicago, IL, USA
2002 fake STi
silver and pink


sure thing Dan
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Old 01-25-2003, 12:58 AM   #4
Scooby Guru
Member#: 19502
Join Date: Jun 2002
Chapter/Region: South East
Location: Charlotte, NC
2010 Impreza with no
scoop. =(


Actually... when you get that mapped tuned stop by my website if you wouldn't mind and upload it. =) We've had quite a few people looking for a stage 3 map. Gluck to you. I'll be tuning my stage 2 + headers map tomorrow down in Atlanta on the dyno.

-Tim McKenzie
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