A'PEXi S-AFC anyone know how?

[neonspirit]

Hello everyone, I was just wondering if anyone has ever put a S-AFC 1 in a spirit R/T and if so was it worth it and how to wire it up. I am new to posting but check out the forums all the time and I haven't seen this on here or if it is I'm sorry for re-posting. Any help would be awesome, Thanks!

[bansheenut420]

Bump. I know someone is running this. I think its just a fairly simple wire up to the map senor or something. Hopefully someone will chime in.

[xtrempickup]

im running one in my iroc R/T

[88jbody]

most times I seen them was connected on MAF boosted cars. nissan toyota ect...

I am not very familiar with them personaly

[xtrempickup]

our cars only use the MAP sensor and tach signal to operate it. there is no schematic to wire ours.

[cky]

I have one in my 90 shelby and its pretty basic to wire up. map signal, tps, dist signal, power and 2 grounds.

[neonspirit]

thanks everyone that gives a better idea on figuring stuff out, I should be able to figure it out, just gotta figure out the wires on the afc.

[Grandma'sCar]

sorry for the off-topic ?, but where in Indiana are you located?

[cky]

Red=Power/ Key forward
Green=RPM/Tach signal
Gray=Throttle/TPS signal

Connect both grounds to ecu ground wire about an inch apart
Brown=Ground close to ecu
Black=Ground farther from ecu

Cut stock map sensor signal wire and connect like this
Yellow=Ecu side of map wire
White=Map side of map wire

Blue=Optional hook up to O2 sensor signal so you can see the voltage under the sensor check screen for sensor #2.

Pink and Orange are for cars with Mass Airflow Sensor's. Not used in ours.

[cky]

The SAFC is pretty limited on our cars with the stock 2 bar map sensor. You can't really add any fuel or it will increase the map voltage to the point where you hit boost/fuel cut which is around 14 psi on a stock car. I use mine to take fuel out in the bottom half of my rpms, I installed dsm 450 cc/min injectors with the stock ecu and stock 2 bar map. Obviously it is going to give the dsm injectors the same amount of voltage it would the stockers cause nothing but the o2 is telling it otherwise and it can't compensate with just that input. So basically it works like this.

I put bigger injectors in and have everything else stock. The ecu will run my car rich as hell thinking the stock injectors are still in it. I use the afc to decrease the map sensor voltage from idle till boost comes in and then I leave it at the default 0. So it fires my dsm injectors like stock until boost comes in and then the ecu fires them full blast like it would the stockers. You can now run more boost if you have an electronic boost cut eliminator or zener diode or something to stop the voltage from rising into the boost/fuel cut area since the ecu thinks its not going past the 14 psi limit.

1 bad thing about SAFC's is when you alter the map sensor voltage it affects the igniton timing. Decreasing voltage/ taking out fuel advance's the timing. Incrreasing voltage/ adding fuel retards the timing.

with that in mind and the fact that I run about 18 psi in my car since I use an electronic boost cut eliminator my ecu thinks its only running 14 psi and gives it the set amount of ignition advance for that psi. 18 psi the ignition would be retarded acouple degrees if it knew thats were the boost was. I then retarded my base distributor timing from the stock 12 degrees advanced to somewhere between 8-10 degrees. pulls way harder at these setting than it does at 12 due to it Knocking/detonating at that level.

Best thing to due is to just save and get a chipped ecu with a tune for your car and bigger injectors and get a 3 bar map sensor too. this way you won't be shooting in the dark trying to tune it yourself and end up blowing your motor up.

Only advanced tuners or people who understand what I just wrote should try this tuning method. Or the incredibly poor who might have one of these laying around for cheap or free. Most people are gonna end up blowing up there engines from going lean or knocking that try to use these though lol.

Holy crap did I really just write that much lol. Im done for now.

[neonspirit]

Grandma's car, I am from Decatur, IN which is by Fort Wayne about 2 hours from you or so, CKY Thanks for all the info you posted that is a lot of stuff to consider, I think I can handle it(I Hope) without blowing it up. This is what is all done to my car as of the moment if you think I should attempt to put it in here.
-255 walbro
-Turbo XS BOV
-Turbo XS Boost Control
-3" exhaust w/Dynamax Ultra Flo Muffler
-8mm spiral core wires
-Turbonetics T3/T4 50 trim turbo
-turbo lines(FWD)
-Head redone(before I bought it) stock by Lingenfelter Performance(FYI a guy by the name of Grahm who works there was a main engineer for these heads when he worked for Lotus before coming to the states to work for John Lingenfelter)
-Custom built aluminum radiator by Be Cool radiators
-Cold air intake
-A/C delete
-Auto meter boost gauge
-A'pexi safc(when and if I install it)
Needs---
It needs a clutch something horrible and a total restore.
The build sheet said it was a in the executive lease program and it was a product evaluation vehicle.
The car says it has 190,190 miles on it but that was before it quit recording miles. I am also looking for a set of good stock TIII cams for a friends sunroof R/T.

[cky]

wow 19x,xxx miles haha. hey my integra has almost 3xx,xxx and still has perfect compression and runs better than new.

A t3/t4 with stock injectors, you better be running 7 psi haha.

I found that you can put in dsm 390 cc/min 1st gen automatic turbo injectors ( work out to flow the same as plus 20%'s) without really needing any management. It will run rich and will sputter and hesitate a tad if you floor it while driving at like 1,000 rpms so I would just ease it up till like 2500 then you will have no prob. you could go the old mechanical route and just get an adjustable fuel pressure regulator and turn down the fuel pressure. search for threads on plus 20% injectors and stock ecu's, acouple people do it this way.

Now with a t3/t4 your gonna need dsm 450 cc/min turbo injectors (equal to plus 40%'s) or plus 40%'s since it flows way more cfm's compared to the stock turbo.
heres your options

Best is to buy plus 40's and a calibrated ecu and run 14lbs and below or get a 3 bar map with the calibration set for it and you can run around 22psi with those injectors. between $300-400 dollars.

Or get bigger injectors and use your afc to take fuel out in the lower rpms until boost comes on then leave it at 0. this works till 14 psi. If you want to go higher you need to clamp the map voltage like I said earlier and you can trick the computer and run more boost. I wouldn't go much further than 18 psi though.

Or get an adjuatsble fuel pressure regulator with bigger injectors and turn down the fuel pressure. you'll need a fuel pressure guage and knowledge on spark plug reading ect.

So sell the afc and buy a cal so you don't blow up your motor.

But if you really want to you can use the afc just to take out fuel and run bigger injectors.

[TurboDoctah]

Quote:

Originally Posted by cky Now with a t3/t4 your gonna need dsm 450 cc/min turbo injectors (equal to plus 40%'s) or plus 40%'s since it flows way more cfm's compared to the stock turbo. heres your options .

just so you know 550cc=+40%'s not 450.. just thought id correct you on that.
just my 2 cents

[cky]

how do you figure this. dodge runs higher fuel pressure than most other cars. dsm's run at like 43 psi so you take them and put them in your dodge and they are now run at 55psi which makes them flow the same as plus 40's

[TurboDoctah]

[/quote][/quote]

Quote:

Originally Posted by cky how do you figure this. dodge runs higher fuel pressure than most other cars. dsm's run at like 43 psi so you take them and put them in your dodge and they are now run at 55psi which makes them flow the same as plus 40's

ok good point.... that makes me wonder if putting 450's in my car was a downgrade from my 550's or an upgrade lol