Welcome to Bimmerfest -- The #1 Online Community for BMW related information! Please enjoy the discussion forums below and share your experiences with the 200,000 current, new and past BMW owners. The forums are broken out by car model and into other special interest sections such as BMW European Delivery and a special forum to voice your questions to the many BMW dealers on the site to assist our members!

Please follow the links below to help get you started!

Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 5 Series > E34 (1989 - 1995)

E34 (1989 - 1995)

 
 
Thread Tools Display Modes
Prev Previous Post   Next Post Next
  #1  
Old 01-26-2013, 11:26 AM
Microtesties Microtesties is online now
Unregistered User
Location: Concord, NH
 
Join Date: Oct 2012
Posts: 101
Mein Auto: 1990 BMW 525i
M20 fuel system upgrades

Hello everyone! So as some of you may know I've been trying to bring my 1990 525i back to its former glory and beyond. I finally have gotten her running just about back to normal, and I'm trying to swap in some performance parts where things need replacing, rather than stock. Currently the car is completely stock except for a 2.7' MAF in place of the AFM.

My fuel pressure regulator was letting a bit of gas into the vacuum line, so I replaced it with the cheapest "OE" part I could find. Come to find out the new regulator is actually not within spec, varying between 38 and 47 psi (should be 40-47). So since the Bosch one is around $100 at the cheapest, I plan on getting the adjustable regulator from IE for $165. I've also been thinking (future) about upgrading from the tiny 1-hole 14lb injectors. Anyway, enough background info.

Questions
-What size injector should I be looking at? (I was thinking 4-hole 17 or 19lb)

-Will my O2 sensor be able to cut injector timing enough to keep it from running rich?

-Can I lower fuel pressure to avoid running too rich?


Thanks in advance for your support!


MAF - https://www.millerperformancecars.co...&category_id=6
Regulator - http://www.iemotorsport.com/bmw/E28-...e30adjreg.html
Injectors - http://www.ebay.com/itm/BMW-E36-M3-3...00874888800%26
__________________
Year: 1990
Model: 525i
Transmission: 5 speed
Mileage: 250k
Reply With Quote
Advertisement
 

Bookmarks


Forum Navigation
Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 5 Series > E34 (1989 - 1995)
Today's Posts Search
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 On



Forum Jump


All times are GMT -7. The time now is 07:33 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
© 2001-2011 performanceIX, Inc. All Rights Reserved .: guidelines .:. privacy .:. terms