Intake mods and fuel pressure - YotaTech Forums


Go Back   >


95.5-2004 Tacomas & 96-2002 4Runners 4th gen pickups and 3rd gen 4Runners
Sponsored by:
Click Here

Intake mods and fuel pressure

Reply
 
LinkBack Thread Tools Search this Thread
Old 03-21-2007, 05:23 PM   #1
Registered User
Thread Starter
 
rbh261's Avatar
 
Join Date: Nov 2004
Location: Martinsville, VA
Posts: 156
Intake mods and fuel pressure

Just curious about something and maybe someone here has experience or data to answer this.

I understand the importance of getting more air into the engine with the least amount of restriction. I also know that the fuel pressure regulator gets its reference vacuum from the silencer box on the intake tube. With that noted, wouldn't the vacuum be lower in a less restrictive intake setup (K&N filter and elbow mod) ? If so, wouldnt the fuel pressure regulator see a lower demand for fuel due to this? So, are we hurting the fuel/air ratio by doing these mods? Is the air intake gain countered be the loss of fuel pressure? Am I over thinking things?
rbh261 is offline   Reply With Quote
Old 03-21-2007, 06:09 PM   #2
Contributing Member
 
marko3xl3's Avatar
 
Join Date: Jun 2005
Location: San Jose, CA
Posts: 1,725
Actually your fuel pressure regulator is connected after the throttle body, and the less vacuum you have, the more fuel it'll 'allow'. With an aftermarket intake, the only thing that could happen AFTER the throttle body is lower vacuum = more fuel, no problem.

That's why us S/C guys connect the FPR to a boosted "vacuum" line, so we can get even more fuel
marko3xl3 is offline   Reply With Quote
Old 03-22-2007, 08:00 AM   #3
Registered User
Thread Starter
 
rbh261's Avatar
 
Join Date: Nov 2004
Location: Martinsville, VA
Posts: 156
I may be missing something, but tracing my vac lines my fuel pressure regulator is connected in front of the throttle body. It's even shown that way on the vacuum diagram. I'm confused.
rbh261 is offline   Reply With Quote
Old 03-24-2007, 05:48 PM   #4
Contributing Member
 
marko3xl3's Avatar
 
Join Date: Jun 2005
Location: San Jose, CA
Posts: 1,725
Quote:
Originally Posted by rbh261 View Post
I may be missing something, but tracing my vac lines my fuel pressure regulator is connected in front of the throttle body. It's even shown that way on the vacuum diagram. I'm confused.
Either way, the lower the vacuum/higher the boost, you'll get more fuel pressure, no matter before or after the TB.

But anyway, an aftermarket intake will not change anything drastically enough to cause fuel pressure problems.

The only problems that could arise are not enough fuel and too much air, but that doesn't usually happen with an intake upgrade only and if you have that problem, it wouldn't be because your new intake increased vacuum.
marko3xl3 is offline   Reply With Quote
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
1994 22re no start. Help! Doug4320 86-95 Trucks & 4Runners 15 11-02-2015 03:31 AM
Low fuel pressure jbv808 86-95 Trucks & 4Runners 10 10-21-2015 05:03 AM
1988 Toyota 4Runner Poppie51 86-95 Trucks & 4Runners 8 07-23-2015 05:03 PM
22re electrical issue leaves me stranded in the Sierra v_man 86-95 Trucks & 4Runners 14 07-23-2015 04:01 PM
1988 4runner Poppie51 Newbie Tech Section 0 07-16-2015 06:16 PM


Tags
2002, air, fuel, head, hose, intake, line, mod, mods, press, pressure, presure, regulator, resonator, tacoma, toyota, vacuum

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -8. The time now is 05:33 AM.


2010 InternetBrands, Inc.