Apex'i S- or V-AFC

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elanguy

New member
This may be the strangest crossover question you've had in a while:

I have a Lotus Elan M100 that I am in the process of trying to get an Apex'I V-AFC (same basic unit as the S-AFC) to work with. What the heck am I posting here for? Well, the Lotus has quite a few GM parts. One of which is likely the only part our vehicles share: a 2-bar MAP sensor (if I'm not mistaken on the ty-sys). I did a search and found this thread (http://www.syty.net/phpBB2/viewtopic.php?t=16302) and was curious what sensor setting Hunter (or others using the same unit) was using on his unit. I've tried various, but can't seem to get the voltage curve to match to what the car needs. i.e. - either I get too steep a slope and I show boost on the AFC at 10" Hg actual or vice versa.

Thanks in advance for any help you can provide. Damn impressive site, BTW. A buddy of mine did an audio system in a Ty for Panasonic a number of years back and I've really been impressed by them. Gotta love this much power.

(Sorry for those who may have seen this message twice. I originally posted it at the above thread, but thought it more appropriate in this board)
 
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smeagol

Active member
The sensors are quite linear. I believe Hunter has an old 3 bar map sensor chip program as a base.

I only read a little about the Apex stuff, maybe you need to find out the specifications of the Honda map sensors, and see what the APex was designed around. I have the specifics for the GM map sensors, or they are available through www.diy-efi.org as well.
 
Hu Ryde

Hu Ryde

Donating Member
The Vafc is a Honda specific unit only. The V part of it controlls the Vtech crossover point. These units need to be installed by professionals and completely solderd to work properly.
 
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elanguy

New member
I did get a voltage output schedule from another source, but will compare it to the link you provided (thanks!). The S-AFC can be configured to work with a number of different vehicles' sensors, but per a call to Apex'i, their "tech support" doesn't know how the unit is configured to read voltage at a particular setting (there are 16 "in" and 16 "out" settings). So much for help there... You're right, the output is quite linear - I just need to find another car's sensor that has the same linear relationship, hence my trial and error :( If Hunter has the 3-bar MAP and got it to work, I may just go that route. I'm planning on running 20-22 psi anyway.

As for the V-AFC, it's basically the S-AFC with some extra leads to run the Vtech engagement, like mentioned above. It should work with other vehicles just as the S-AFC does. I picked it up so I could use the Vtech lead to instead control the rpm at which my secondary intake runners open. Install is actually very simple if you have an electrical schematic of your vehicle.
 
tyndago

tyndago

New member
elanguy said:
but per a call to Apex'i, their "tech support" doesn't know how the unit is configured to read voltage at a particular setting (there are 16 "in" and 16 "out" settings).
Click to expand...

I knew the guy that used to be Apex'i tech support in the US. He doesn't work there anymore..... I may have his number somewhere --- but then again I don't know how much he can help...

Did you look online at there website. I know they had some manuals online...
 
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elanguy

New member
Apex'i manuals

Apex'i manuals

If you could help me get in touch with him, that would be great.

Yes, I have been through their web site and searched all the manuals and updates. Basically they've just listed settings for the most popular vehicles to tune. Unfortunately that doesn't help folks like us with rather unique vehicles.

Out of all the settings, I did get 02/02 to show me 0 pressure/vacuum with the key on and car off. Once my A/F meter kit comes in , I'll start the car to see if the voltage map is linear on either side (if it is calibrated for a 2-bar sensor).

Thanks for the help.
 
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elanguy

New member
DSM thread

DSM thread

Thanks much for the link! It seems there are more folks experienced with the 3-bar than the 2-bar. (?) I just ran at Mid-Ohio this weekend and am frustrated at not having things sorted yet. I sure could've used the extra power...
 
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