TeamSwift

Home of the Suzuki mini-compacts ! Your Home for all things Suzuki Swift, Geo Metro, Holden Barina, Chevy Sprint, Pontiac Firefly, and Suzuki Cultus. TeamSwift is a technical performance oriented community!
It is currently Thu Apr 24, 2014 1:54 pm

Underbody braces, turbos and more!

All times are UTC - 5 hours




Post new topic Reply to topic  [ 11 posts ] 
Author Message
 Post subject: Injector upgrade??
PostPosted: Sun Apr 01, 2012 7:53 pm 
Offline
User avatar

Joined: Thu Dec 08, 2005 3:30 pm
Posts: 100
Location: Phoenix
Hypothetically (of course)

So, lets say I just got an 87 sprint running again after a decade of sitting. Upon the test runs, it shows I am needing just a little more fuel injector to keep up with what I am currently running. What would be the best and easiest upgrade without breaking the bank. (As I don't need much, just a little)
I have run stock stuff for so long, I really never dabbled into the wild world of slightly souped up parts.
Also, what other items usually go along with this type of upgrade?
Thanks in advance.


Top
 Profile  
 
 Post subject: Re: Injector upgrade??
PostPosted: Sun Apr 01, 2012 8:22 pm 
Offline
banned and still posting
User avatar

Joined: Mon Dec 01, 2003 12:47 pm
Posts: 10795
Location: columbus, ohio
stock injectors flow 210 cc/min. you could find some cast off honda injectors on ebay in the 250 to 290 cc/min range pretty cheap.

_________________
1991 Blue Geo Metro Convertible highly modified 1.0L Turbo3 5 spd. - 1991 Red Geo Metro Convertible customized with a Twincam 5 spd. - 1992 White Suzuki Swift GT

My Turbo3 Project
My Cardomain Page -Ol' Blue
My YouTube Channel
My Photo Gallery
SAAB Sonett II


Top
 Profile  
 
 Post subject: Re: Injector upgrade??
PostPosted: Mon Apr 02, 2012 10:12 am 
Offline
User avatar

Joined: Tue Feb 13, 2007 10:28 pm
Posts: 927
Location: So Cal, USA
I have bought several sets of used injectors on Ebay with good luck.

Just look for the high impedance ones, and be sure they include the
connectors, in case they are different clips than the OE ones, you can
splice in the new clips.

The used stuff on Ebay is cheap enough that it's not a big loss if they don't
work out based on the flow rate you choose. Of course, I'm assuming you
have an A/F gauge which should tell you how the injectors are performing.
Unfortunately there's no way to monitor or adjust duty cycle if you are running
stock stuff. You kinda just gotta go with the A/F readings and pick the best size
with the overall performance.
Based on my project, 15psi boost, upgraded high flow fuel pump, and modified fuel
pressure I tried several sizes:
240 = lean under boost
275 = acceptable overall, though just slightly lean at full boost
380 = Way too rich at moderate to full boost
I've just purchased some 320, I'm hoping these will work out best

You probably won't have to worry about running rich at idle as the o2 sensor
will compensate. It's pretty much the boost setting that will determine your
needs. You can slightly tweak the way your injectors perform by changing
spring tension in the maf.


I've paid about $40-60 for a set, but you're probably gonna have to buy
a set of 4 :D

Ebay seller zipaquio seems to have some good stuff.


Top
 Profile  
 
 Post subject: Re: Injector upgrade??
PostPosted: Mon Apr 02, 2012 8:06 pm 
Offline
User avatar

Joined: Thu Dec 08, 2005 3:30 pm
Posts: 100
Location: Phoenix
Thanks guys. That is the info I needed.
I was actually looking at a set, but didn't want to pull the trigger on something that wouldn't work.


Top
 Profile  
 
 Post subject: Re: Injector upgrade??
PostPosted: Mon Apr 02, 2012 8:32 pm 
Offline
User avatar

Joined: Tue Feb 13, 2007 10:28 pm
Posts: 927
Location: So Cal, USA
Oh yeah, forgot to mention that of course you want to
visually ID the injectors to make sure they're the same
shape/style.

Keep us posted on your results!


Top
 Profile  
 
 Post subject: Re: Injector upgrade??
PostPosted: Thu Apr 05, 2012 10:34 pm 
Offline

Joined: Thu Dec 16, 2010 7:53 am
Posts: 14
Location: Australia
If you only need a minimal increase just up the fuel pressure by 10 psi so that you are getting an increase across the board. Probably work out cheaper that stuffing around with extra injectors.

Cheers
Paul


Top
 Profile  
 
 Post subject: Re: Injector upgrade??
PostPosted: Fri Apr 06, 2012 5:05 am 
Offline
banned and still posting
User avatar

Joined: Mon Dec 01, 2003 12:47 pm
Posts: 10795
Location: columbus, ohio
that works okay if you have an adjustable fuel pressure regulator.

the turbo3 system has a fixed fpr that maintains fuel pressure at a constant 36.2 psi above manifold absolute pressure up to the limit of the fuel pump.

_________________
1991 Blue Geo Metro Convertible highly modified 1.0L Turbo3 5 spd. - 1991 Red Geo Metro Convertible customized with a Twincam 5 spd. - 1992 White Suzuki Swift GT

My Turbo3 Project
My Cardomain Page -Ol' Blue
My YouTube Channel
My Photo Gallery
SAAB Sonett II


Top
 Profile  
 
 Post subject: Re: Injector upgrade??
PostPosted: Tue Apr 17, 2012 3:47 am 
Offline

Joined: Thu Dec 16, 2010 7:53 am
Posts: 14
Location: Australia
I understand that you would have to buy an adjustable FPR but surely that is better, easier and cheaper than stuffing around with injectors trial and error style?


Top
 Profile  
 
 Post subject: Re: Injector upgrade??
PostPosted: Tue Apr 17, 2012 5:05 am 
Offline
banned and still posting
User avatar

Joined: Mon Dec 01, 2003 12:47 pm
Posts: 10795
Location: columbus, ohio
there's a limit to the available headroom of the fuel pump's pressure output. if you run higher fuel pressure to trim the injectors, it cuts down on the total boost pressure you can run.

_________________
1991 Blue Geo Metro Convertible highly modified 1.0L Turbo3 5 spd. - 1991 Red Geo Metro Convertible customized with a Twincam 5 spd. - 1992 White Suzuki Swift GT

My Turbo3 Project
My Cardomain Page -Ol' Blue
My YouTube Channel
My Photo Gallery
SAAB Sonett II


Top
 Profile  
 
 Post subject: Re: Injector upgrade??
PostPosted: Wed Apr 18, 2012 12:42 am 
Offline
User avatar

Joined: Tue Feb 13, 2007 10:28 pm
Posts: 927
Location: So Cal, USA
http://www.teamswift.net/viewtopic.php?f=32&t=47916&start=25

Page 2 on this post, bout halfway down shows the B&M Fuel Pressure
Modifier, about $50. It's designed for Honda's, but will work fine.
You will need to shim it slightly with a thin washer to get
the housing to snug up properly.

I believe T3 ragtop has a similar setup on his current project.

The problem with upgrading injectors on the stock system (with the FPR and
upgraded pump) is that if you go too big, you will run pig rich under light
boost. As the turbo boost kicks in at high pressures, you will see a
quick dramatic drop in the a/f ratio- which will put you at a more desireable
a/f ratio. Definately not good for crusing around town, but better if
you are only doing short balls out runs. You have to find a happy medium
depending on your purpose.
Of course your results will vary based on actual airflow. If you're running
high boost with the stock turbo and piping, you'll get different results
than running a larger turbo with increased diameter piping. The stock
turbo can only flow so much air, no matter what boost you set
and there's many variables like exhuast tubing size, muffler, air filter
set up...etc.


Top
 Profile  
 
 Post subject: Re: Injector upgrade??
PostPosted: Wed May 09, 2012 8:41 am 
Offline

Joined: Sun Dec 14, 2008 8:25 pm
Posts: 77
Location: Calgary
Changing fuel pressure too much also messes with spray pattern of the injector, so you can only get so far with that modification. The larger injectors are where it's at.

_________________
turbo 3 swapped 90 firefly convertible

low mile 90 firefly 3 cylinder/auto 4 door

beat to hell 89 GTi


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 11 posts ] 

All times are UTC - 5 hours


Who is online

Users browsing this forum: No registered users and 0 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group