Welcome to the North American Subaru Impreza Owners Club Friday December 15, 2017
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
Go Back   NASIOC > NASIOC Technical > Engine Management & Tuning > Other Engine Management

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. 
Thread Tools Display Modes
Old 05-04-2006, 02:23 PM   #1
Scooby Newbie
Member#: 56133
Join Date: Feb 2004
2004 Euro spec Sti
Black - Rotated gt3037s

Default Backfire @ shifting

I can see fireballs from the mirror and car feels awkward while shifting.

Is this related with "throttle pump" settings ?

How can i smoothen shifting ?

WhiteKnight is offline   Reply With Quote
Old 05-04-2006, 02:30 PM   #2
Scooby Newbie
Member#: 107778
Join Date: Feb 2006
Chapter/Region: TXIC
Location: Hizzurst, Texas
2006 Legacy GT Sedan
Obsidian Black


I have no idea, but what you are describing is afterfire. A backfire goes back through the intake manifold.

I once had afterfire on my old RS-T. Felt like someone threw a bowling ball on my floorpan.
herewegoagain is offline   Reply With Quote
Old 05-04-2006, 02:59 PM   #3
Scooby Specialist
Member#: 56468
Join Date: Mar 2004
Chapter/Region: NWIC
Location: Seattle, WA
04 Improved STI
Dirty White


I'd try lowering Decel Enrichment and I'd look at the vacuum part of the fuel map.

As you shift have someone watch the AFR and which cell(s) is active during the shift. You may find you need to remove fuel from that cells and those surrounding it. (most likely the whole load column).

Now, are you seeing fireball when you get back on the gas? That could be throttle pump.
bboy is offline   Reply With Quote
Old 05-05-2006, 03:27 AM   #4
Element Tuning
Former Vendor
Member#: 54918
Join Date: Feb 2004
Chapter/Region: MAIC
Location: Gaithersburg, MD
673 WHP Element
Tuning Pro Comp Engine


From some of the other questions you've posted it sounds like you have a really bad base map. It doesn't sound like you have an Element Tuning version of the Hydra EMS as I don't sell these outside of North America but if you are interested we do sell base maps and tech support to those who do not own an Element Hydra.

Based on the amount of backfire and the fire ball it sounds like your main fuel map is much too rich in the lower vacuum load sites.

Good luck.
Element Tuning is offline   Reply With Quote

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

All times are GMT -4. The time now is 07:26 AM.

Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2017 Axivo Inc.
Copyright ©1999 - 2017, North American Subaru Impreza Owners Club, Inc.