Welcome to the North American Subaru Impreza Owners Club Monday December 22, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Normally Aspirated with bolt-on Forced Induction Powertrain

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.
Reply
 
Thread Tools Display Modes
Old 11-07-2001, 02:35 AM   #1
Andrew
Scooby Specialist
 
Member#: 1170
Join Date: Mar 2000
Chapter/Region: BAIC
Location: San Jose, CA
Vehicle:
2005 STi
White

Default Split Second ARC2

Since Im upgrading to 440cc injectors I would like to control them with something. IIRC the SAFC can only control the MY00+ during WOT (closed-loop I believe). If I'm wrong PLEASE correct me. What I was looking at was the Split Second ARC2. I did a search and found 3 threads that didnt help at all. The ARC2's specs and everything can be seen here:http://www.splitsec.com/products/arc2/arc2ds.htm

SplitSec's overview of the product is as follows:
Quote:
The ARC2 (Air/fuel Ratio Calibrator) provides additional features over the ARC1. These features make it possible to fit a MAF sensor to engines that were designed to operate with vane type air flow meters. It is especially useful for re-calibration of modified engines that have ECU (Engine Control Units) designed for MAP or MAF (Mass Air Flow) sensors, also compatible with GM and Karman Vortex applications. In addition to the low and high load adjustments of the ARC1, the ARC2 also provides adjustments for mid load and acceleration boost
It sounds like it should work fine with our MAPs but I'm wondering if it would only work during WOT as well.

And obviously I would want to organize a group buy because of the price. I was also looking at a TMC1. It would be great if we could get a group buy on both pieces going. But first lets discuss the ARC2 and if it would work properly or not.
* Registered users of the site do not see these ads.
Andrew is offline   Reply With Quote
Old 11-07-2001, 02:58 AM   #2
TMR Impreza
Scooby Specialist
 
Member#: 168
Join Date: Aug 1999
Chapter/Region: SCIC
Location: San Pedro
Vehicle:
2011 M3 and 328i
white and black

Cool

I ran a ARC2 on my RS and it works 100x better than the AFC. If your interested in one, I have a friend that works at SS that can answer some of your questions.

http://albums.photopoint.com/j/Album...6189&f=0&vt=vp
TMR Impreza is offline   Reply With Quote
Old 11-07-2001, 03:01 AM   #3
Andrew
Scooby Specialist
 
Member#: 1170
Join Date: Mar 2000
Chapter/Region: BAIC
Location: San Jose, CA
Vehicle:
2005 STi
White

Default

TMR, I forogt what you used to have...pre00 or post00?

also can you get a discount or find out how low they can go on a group buy?
Andrew is offline   Reply With Quote
Old 11-07-2001, 12:51 PM   #4
MPREZYA
SCIC
Moderator
 
Member#: 85
Join Date: Jul 1999
Chapter/Region: SCIC
Location: www.themonkeystrunk.com
Default

Ummm Hey Don where are you!!!!!
MPREZYA is offline   Reply With Quote
Old 11-07-2001, 03:06 PM   #5
Andrew
Scooby Specialist
 
Member#: 1170
Join Date: Mar 2000
Chapter/Region: BAIC
Location: San Jose, CA
Vehicle:
2005 STi
White

Default

I called splitsecond up and they told me the ARC1 fits my needs better so I ordered it. They are the only ones I know of that can control the fuel during normal driving and WOT.
Andrew is offline   Reply With Quote
Old 11-07-2001, 03:17 PM   #6
Jewbaru
Scooby Specialist
 
Member#: 1994
Join Date: Jul 2000
Location: "Teh Hebro Town"
Vehicle:
2013 Impreza WRX
WRB

Default

hmm... you're turbo'd, 2000, hmm... But what about that stupid voltage problem? How can you use the ARC1?
Jewbaru is offline   Reply With Quote
Old 11-07-2001, 03:23 PM   #7
Andrew
Scooby Specialist
 
Member#: 1170
Join Date: Mar 2000
Chapter/Region: BAIC
Location: San Jose, CA
Vehicle:
2005 STi
White

Default

i think it acts as a voltage clamp as well. he said it has a map within it that sends a signal. if i ****ed up please tell me so i can call them back and ask them some more questions and/or cancel my order.
Andrew is offline   Reply With Quote
Old 11-07-2001, 03:25 PM   #8
Jewbaru
Scooby Specialist
 
Member#: 1994
Join Date: Jul 2000
Location: "Teh Hebro Town"
Vehicle:
2013 Impreza WRX
WRB

Default

CALL 'EM!! Ask about the MAP Clamp and explain our situation. Hell, I'll call if you want, pass on the number.
Jewbaru is offline   Reply With Quote
Old 11-07-2001, 03:27 PM   #9
Andrew
Scooby Specialist
 
Member#: 1170
Join Date: Mar 2000
Chapter/Region: BAIC
Location: San Jose, CA
Vehicle:
2005 STi
White

Default

......

Last edited by Andrew; 08-13-2008 at 07:05 PM.
Andrew is offline   Reply With Quote
Old 11-07-2001, 03:34 PM   #10
Jewbaru
Scooby Specialist
 
Member#: 1994
Join Date: Jul 2000
Location: "Teh Hebro Town"
Vehicle:
2013 Impreza WRX
WRB

Default

allright, he recommended the ARC1-002 I think was the part number. The person you spoke to wasn't available (Mark), but he's going to call me back so I can pry as much info as possible from him. He said the ARC1-002 has a boost input.

I'll keep you updated.
Jewbaru is offline   Reply With Quote
Old 11-07-2001, 03:35 PM   #11
Andrew
Scooby Specialist
 
Member#: 1170
Join Date: Mar 2000
Chapter/Region: BAIC
Location: San Jose, CA
Vehicle:
2005 STi
White

Default

Thanks Jewbaru. I really appreciate this.
Andrew is offline   Reply With Quote
Old 11-07-2001, 04:08 PM   #12
blaster88
Scooby Specialist
 
Member#: 1109
Join Date: Mar 2000
Chapter/Region: MAIC
Location: Reston, VA
Vehicle:
1999 Suzuki Samurai
Blackish

Default

I think you'll have to get a 2bar MAP sensor and run it in parallel to use the ARC1. Our MAP is 1 bar only, and since we have to clamp it, the ARC1 will never get a "boost" voltage.
blaster88 is offline   Reply With Quote
Old 11-07-2001, 04:24 PM   #13
Jewbaru
Scooby Specialist
 
Member#: 1994
Join Date: Jul 2000
Location: "Teh Hebro Town"
Vehicle:
2013 Impreza WRX
WRB

Default

The way the guy I spoke to made it sound, the ARC1 has a vacuum line that the turbo connects to so it'll see boost, and compensate for it for the ECU.

We'll see when Mark calls me.
Jewbaru is offline   Reply With Quote
Old 11-07-2001, 04:29 PM   #14
blaster88
Scooby Specialist
 
Member#: 1109
Join Date: Mar 2000
Chapter/Region: MAIC
Location: Reston, VA
Vehicle:
1999 Suzuki Samurai
Blackish

Default

That's not one the description of the product says. The TMC1 has a built in MAP sensor, though.
blaster88 is offline   Reply With Quote
Old 11-07-2001, 04:34 PM   #15
Jewbaru
Scooby Specialist
 
Member#: 1994
Join Date: Jul 2000
Location: "Teh Hebro Town"
Vehicle:
2013 Impreza WRX
WRB

Default

the model number he gave me isn't on their website.
Jewbaru is offline   Reply With Quote
Old 11-07-2001, 05:20 PM   #16
Andrew
Scooby Specialist
 
Member#: 1170
Join Date: Mar 2000
Chapter/Region: BAIC
Location: San Jose, CA
Vehicle:
2005 STi
White

Default

the model number he ordered for me isnt on their site. i think he ordered me the same one Jewbaru is talking about. Its also more expensive (~320). and about the vacuum, i was thinking the same thing you are. he made it sound like there wouldnt be a problem. I hope Mark calls you back.
Andrew is offline   Reply With Quote
Old 11-07-2001, 05:21 PM   #17
Jewbaru
Scooby Specialist
 
Member#: 1994
Join Date: Jul 2000
Location: "Teh Hebro Town"
Vehicle:
2013 Impreza WRX
WRB

Default

he hasn't called yet. If I don't hear from him, I will call him back at around 4:30-5pm my time (CST).
Jewbaru is offline   Reply With Quote
Old 11-07-2001, 11:21 PM   #18
Jewbaru
Scooby Specialist
 
Member#: 1994
Join Date: Jul 2000
Location: "Teh Hebro Town"
Vehicle:
2013 Impreza WRX
WRB

Thumbs up Good News!!!

I talked to Mark a little while ago, I just recently got a chance to post, here's the scoop.

The ARC1-002 works like this:

There are two knobs, a low, and a high kindof like how the regular unit is, BUT the knobs work differently.

The low knob only works in the minus, so you use it to dial back the mixture if you're running overly rich off boost (like most 2000 owners are). This works up till 0 vacuum. The ARC also has a built in MAP sensor, so when it sees positive pressure, the high knob kicks in. With it, you can adjust fuel delivery, and enrichen/lean out the mixture as needed.

Aside from this, the ARC1-002 has a built in clamp, and it can be set to whatever we'd like.

Now, in order for the ARC1-002 to work at it's full potential, you'd still need to increase fuel pressure when the car is on boost. Upping the fuel pressure a bit, then using the ARC to fine tune it will yeild the best results.

Andrew, I'm gonna e-mail you with some more details and such. I want to be sure to stay in close contact with you in regards to the tuning and such. This sounds like it could be a reliable alternative to the more expensive full engine managment for those who are looking to run reliable low boost.
Jewbaru is offline   Reply With Quote
Old 11-08-2001, 12:53 AM   #19
inpreza kid
Scooby Specialist
 
Member#: 3334
Join Date: Dec 2000
Location: Calgary, Alberta, Canada
Default

i don't quite understand how this unit works to control fuel after the voltage clamp kicks in. does it control the injectors directly? i seem to be missing something here. anyone have any details on how this unit works with the stock ecu?
inpreza kid is offline   Reply With Quote
Old 11-08-2001, 01:05 PM   #20
Jewbaru
Scooby Specialist
 
Member#: 1994
Join Date: Jul 2000
Location: "Teh Hebro Town"
Vehicle:
2013 Impreza WRX
WRB

Default

ok, basically, it "scales" the voltage down depending on your settings.

Say N/A at a certain vacuum point, the ECU was seeing 2.8v and adjusting fuel accordingly. What the ARC would do is take that voltage coming in and scale it. So if N/A you saw 2.8v, with the ARC tuned you might see 1.8v.

What this would do is offset the car's running rich with a high flow fuel pump, and at the same time give a smooth rise in fuel delivery. The only time it would "clamp" is if you had the HIGH knob turned high enough to where it would max out the voltage at a certain PSI.

It intercepts the MAP signal from the sensor, and alters it for the ECU, never going over a set voltage.

Does that help?
Jewbaru is offline   Reply With Quote
Old 11-08-2001, 01:58 PM   #21
Andrew
Scooby Specialist
 
Member#: 1170
Join Date: Mar 2000
Chapter/Region: BAIC
Location: San Jose, CA
Vehicle:
2005 STi
White

Default

Guys, I got some good info that I think you will all be interested in. I'm going to start up a new thread.
Andrew 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
Split Second arc 2 question? spgavin Normally Aspirated Powertrain 0 07-31-2001 02:29 AM
Wiring In A Split Second! spgavin Normally Aspirated Powertrain 1 06-20-2001 08:45 PM
WTB Split Second Timing Controler SubaFastR Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 0 05-29-2001 08:53 AM
Local Sale: Split Second Boost Guage Revision Mid West Subaru Owners Club Forum -- MWSOC 3 02-20-2001 03:06 PM
Apex S-AFC or Split Second ARM/ARC-1 Kyle Paton Technical Forum Archive 5 08-18-2000 11:58 AM


All times are GMT -4. The time now is 07:01 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.