Welcome to the North American Subaru Impreza Owners Club Saturday May 23, 2015
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Engine Management & Tuning

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 10-25-2002, 02:18 PM   #1
superg
Scooby Newbie
 
Member#: 3385
Join Date: Dec 2000
Location: Golden, CO
Vehicle:
2002 WRX
WRB

Default UTEC: 91 Octane, Altitude and Maps

A question for the Turboxs guys:

Premium in Colorado is of course only 91 octane, yet most sources on gasoline say this is not a problem because octane requirements decrease with altitude.

Do you expect the 91 octane up here will require us to adjust from the standard mapping you provide? I'm using stage 1 in "set and forget" mode.

And will mapping need to be adjusted when the temperature rises to 100 F in the summer?

So far (two days driving at 5280' and 30 degrees F) your out-of-the-box UTEC stage 1 setting has been perfect-- giving me no knock (no CEL flashes) and boost is right on 16 psi in 4th and 5th uphill.

I'll report Monday after I have done a fast run over Loveland Pass (12,000').

Superg
* Registered users of the site do not see these ads.
superg is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 10-25-2002, 02:25 PM   #2
nmyeti
Scooby Specialist
 
Member#: 4980
Join Date: Mar 2001
Location: Albuquerque, NM USA
Default Re: UTEC: 91 Octane, Altitude and Maps

Quote:
Originally posted by superg
A question for the Turboxs guys:

Premium in Colorado is of course only 91 octane, yet most sources on gasoline say this is not a problem because octane requirements decrease with altitude.

Do you expect the 91 octane up here will require us to adjust from the standard mapping you provide? I'm using stage 1 in "set and forget" mode.

And will mapping need to be adjusted when the temperature rises to 100 F in the summer?

So far (two days driving at 5280' and 30 degrees F) your out-of-the-box UTEC stage 1 setting has been perfect-- giving me no knock (no CEL flashes) and boost is right on 16 psi in 4th and 5th uphill.

I'll report Monday after I have done a fast run over Loveland Pass (12,000').

Superg

With the lower effective compression ratio that you are running, i doubt that you'll need to touch the map much as long as you don't try to compensate for the loss of atmospheric pressure by running higher boost.

-Nathan
www.turboxs.com
nmyeti is offline   Reply With Quote
Old 10-25-2002, 03:29 PM   #3
cnstman
Scooby Specialist
 
Member#: 9548
Join Date: Aug 2001
Chapter/Region: RMIC
Location: Colorado Springs
Vehicle:
2004 WRX STi
10.154 @139 @ 7,000'DA

Default boost control?

superg are you running the ABC boost controler that came with the utec. i had the ABC with my unichip, but it was every unstable with temp/altitude. how is your working??

also where in CO are you. here in the springs we have one Farmcrest that sells 93 octane.

thanks for the info..
cnstman
cnstman is offline   Reply With Quote
Old 10-25-2002, 03:44 PM   #4
superg
Scooby Newbie
 
Member#: 3385
Join Date: Dec 2000
Location: Golden, CO
Vehicle:
2002 WRX
WRB

Default ABC

I am using the Turboxs aux boost controller that came with my previous Unichip (the blue, adjustable one.) Turboxs confirmed that it is identical to the new one that came with my UTEC. I had not experienced boost instability with the Unichip and this boost control, although the non-adjustable one (the short blue tube) that came with my Unichip initially was allowing oevrboost, especially at cold temps and high altitudes.

I intsalled the UTEC and didn't touch the ABC setting from what I had before with the Unichip. Boost is very stable at 16 psi in 4th and 5th under full throttle load, going up slight hills on I25. I'll report next week on how stable the boost is in the moutains.

BTW, I am in Denver. Haven't found a convenient source of greater than 91 gas, but I know there are a few sources around Denver. Someday I'll try 93, but I really want a quick, reliable, safe setup that runs nicely on 91 and gets me over Loveland Pass in spirited fashion!

Superg
superg is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
will MY02 OSECU Stage 2 91 Octane *AT/MT* map work? aznburn210 Open Source Reflashes 5 06-28-2010 09:11 PM
91 Octane with 93 map wrxagon67 AccessPort 7 01-17-2008 09:46 PM
92/93 octane safe for 91 Octane Map? Nuisance Engine Management & Tuning 2 09-18-2005 10:04 PM
Using a unichip mapped for 91 octane on a 93 or 94 octane gas.... advice WRXVII Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 15 03-07-2003 01:18 PM
Vishnu: Using a unichip mapped for 91 octane on a 93 or 94 octane gas.... advice WRXVII Engine Management & Tuning 1 03-06-2003 09:46 PM


All times are GMT -4. The time now is 04:37 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2015 Axivo Inc.
Copyright ©1999 - 2015, North American Subaru Impreza Owners Club, Inc.