Welcome to the North American Subaru Impreza Owners Club Friday March 29, 2024
Home Forums Images WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC Technical > Factory 2.5L Turbo Powertrain (EJ Series Factory 2.5L Turbo)

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.







* As an Amazon Associate I earn from qualifying purchases. 
* Registered users of the site do not see these ads. 
Reply
 
Thread Tools Display Modes
Old 09-29-2009, 04:40 PM   #1
Blown95ImpalaSS
Scooby Specialist
 
Member#: 87629
Join Date: May 2005
Chapter/Region: SCIC
Location: Los Angeles
Default E85 fueling question- 850cc + fpgreen...adjustable FPR?

I searched around but I would like some of you e85 guys to chime in on this. Currently my car is tuned on pump gas

2.4/7cm old school fpgreen
perrin fmic
850cc inj
38mm gate
header, catless blah blah

car runs great, but I want more power of course. there are 4-5 e85 stations that opened up locally in the last 6 months and I think my best option for more power is an e85 tune. My tuner is fine with it but he thinks I might run out of injector. Assuming that i can somehow make a m ap switch between pump and e85...

can I install an adjustable fuel pump regulator to raise fuel pressure, similar to what I used on my old 4g63 motor? I want this to avoid having to purchase and install larger 1000cc injectors.

thoughts? just bite the bullet for larger injectors? or just screw the whole thing and bolt on a meth kit?

* Registered users of the site do not see these ads.
Blown95ImpalaSS is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 09-29-2009, 05:42 PM   #2
juanmedina
Scooby Guru
 
Member#: 133146
Join Date: Nov 2006
Location: SC
Vehicle:
07 FPgreen 7.37@95
WRX VF39+E85 12.0, 121mph

Default

If you are running out injectors with the 850cc even if you up the fuel pressure it will not be enough. You need to get the 1000cc no matter what.
juanmedina is online now   Reply With Quote
Old 09-29-2009, 06:51 PM   #3
kpluiten
Scooby Guru
 
Member#: 120273
Join Date: Jul 2006
Chapter/Region: SWIC
Location: AZ
Vehicle:
06 WRBWRXWGN
Now with 100% more Spec-C

Default

OK, I have some anecdotal evidence here:

I have a DOM 2.0 (52 lb/min), 38mm EWG, paralleled factory fuel rails, stock fuel pressure (43.5 psi), and e85. I have Bosch 1000CC injectors

At 21.5 PSI boost, I am basically maxing my injectors 95%+

There are two things to consider here: 1) my tune is on the rich side, but still not excessively so and 2) the Bosch 1000CC units seem to flow less than 1000cc, probably closer to 925+ CC.

Either way I'm maxed. I know that I can get these injectors to flow 1600CC if I raise the fuel pressure to 80+ PSI with the appropriate pump setup.

You will see similar results, but you will max quicker due to the smaller injector. However, yes, raising your fuel pressure should increase their flowrate if your pump setup can back that up.

This is a long winded explaination. If you are willing to up the pressure a good amount, you should be able to get those 850's to flow 1000cc+ I'd think. But your fuel system will likely need an upgrade too.
kpluiten is offline   Reply With Quote
Old 09-29-2009, 06:59 PM   #4
bcblues
Scooby Specialist
 
Member#: 17256
Join Date: Apr 2002
Chapter/Region: South East
Location: America's Outback
Vehicle:
18 Outback
on the road....

Default

Upping the pressure would definitely help. Would it help as much as 1000cc injectors? No.

Would meth solve your problem? Probably not,unless you run a huge meth injector. And even then it is far harder to tune for the meth than it is to tune for larger injectors (having done both myself).

I say just bite the bullet and get the larger injectors.
bcblues is offline   Reply With Quote
Old 09-29-2009, 07:05 PM   #5
juanmedina
Scooby Guru
 
Member#: 133146
Join Date: Nov 2006
Location: SC
Vehicle:
07 FPgreen 7.37@95
WRX VF39+E85 12.0, 121mph

Default

Quote:
Originally Posted by kpluiten View Post
OK, I have some anecdotal evidence here:

I have a DOM 2.0 (52 lb/min), 38mm EWG, paralleled factory fuel rails, stock fuel pressure (43.5 psi), and e85. I have Bosch 1000CC injectors

At 21.5 PSI boost, I am basically maxing my injectors 95%+

There are two things to consider here: 1) my tune is on the rich side, but still not excessively so and 2) the Bosch 1000CC units seem to flow less than 1000cc, probably closer to 925+ CC.

Either way I'm maxed. I know that I can get these injectors to flow 1600CC if I raise the fuel pressure to 80+ PSI with the appropriate pump setup.

You will see similar results, but you will max quicker due to the smaller injector. However, yes, raising your fuel pressure should increase their flowrate if your pump setup can back that up.

This is a long winded explaination. If you are willing to up the pressure a good amount, you should be able to get those 850's to flow 1000cc+ I'd think. But your fuel system will likely need an upgrade too.
upping the pressure is not as safe as running the correct injectors for his setup, what would happen if the pump fails??

How much are putting down with the Dom2?

Edit: I remember now, did you rise the boost or not?
juanmedina is online now   Reply With Quote
Old 09-29-2009, 07:37 PM   #6
kpluiten
Scooby Guru
 
Member#: 120273
Join Date: Jul 2006
Chapter/Region: SWIC
Location: AZ
Vehicle:
06 WRBWRXWGN
Now with 100% more Spec-C

Default

Quote:
Originally Posted by juanmedina View Post
upping the pressure is not as safe as running the correct injectors for his setup, what would happen if the pump fails??

How much are putting down with the Dom2?

Edit: I remember now, did you rise the boost or not?
I think if the pump fails he's boned either way right? No fuel is no fuel!

I have not upped the boost yet because I haven't figured out what I want to do on the fuel system side of things. I will probably go with the same walbro 255 in the tank, a Bosch 044 inline, and an ajustable FPR. I'm then going to turn up the boost to about 24 psi.

I am having an issue right now with what I think may be boost creep. It is possible I'm maxing out the 38mm EWG, but I don't know for sure until my tuner messes with some things. I need to remedy this issue though and I do not want to pay to upgrade to a 44mm. I've been toying with a crazy idea of using both the internal and external gates, but I haven't moved to put this idea into motion... yet.
kpluiten 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
adjustable fpr install questions Rickyh Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 0 07-22-2004 06:23 PM
Question About Adjustable Fpr wrxxer Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 0 05-21-2004 06:13 PM
Adjustable FPR (bolt-on) JustDSM Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 5 07-01-2003 07:36 PM
Fuel Pump failure, Injector, and FPR questions BamBooI Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 1 03-26-2002 02:05 PM
Will this MSD adjustable FPR work along with the Vortech FMU? scootr Normally Aspirated with bolt-on Forced Induction Powertrain 4 11-15-2001 11:48 AM

All times are GMT -4. The time now is 07:59 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2024 Axivo Inc.
Copyright ©1999 - 2019, North American Subaru Impreza Owners Club, Inc.

As an Amazon Associate I earn from qualifying purchases.

When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission
Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.