Okay.. I put an safcin my car and tuned during cruise.. don't have a broadband or anything so I just took fuel out till it started to stumble and then added 3-4%. (for low throttle settings)

for high throttle I haven't messed with things much except adding 10% at 3000RPM and 15% 4000 and up.


On a highway trip yesterday I noticed about 5-7 more MPG! (33ish instead of 25 @85mph)

WOW!
I think it will pay for itself in about a month, this is awesome.

Are there any issues that maybe I haven't forseen?

Has anyone retrofitted an S5 TPS for just the SAFC to use so that I can have low throttle settings at more than 10% (or whatever 100% on the stock TPS works out to ) throttle? I have noticed that I can't cruise at more than about 80-85mph (depending on weather ALOT!) without dipping into the WOT maps which at that speed makes it much richer and decreases MPG significantly. I realise this is NOT a civic and therefore won't be great on gas, but it would be great if I could use the lowthrottle setting on more than 10% (like maybe 20-25%? fuel.

What about hooking it up to the pressure sensor, has anyone done that? How does that work with the FCD? I suppose it would be benifical to wire the SAFC in to see the TRUE boost instead of the FCD limited boost, eh?

 

Bump.

 

You're adding fuel on the low throttle map? Most people are leaning it out buy 15-20%.

Pressure sensor connection has been covered several times in the past few weeks. Ideally, you will want to use an aftermarket boost/vacuum sensor.

 

If you want more info on the pressure sensor convertion, I will write up a thread on how it is done and sensors to use. The convertion give the SAFC a progressive curve to deal with. It takes more tunning but you will be happier with the results. You have to run a seperate sensor though.

 

does anyone know where we can find an aftermarket pressure sensor? is there any way to use a more accurate one in place of the stock one or do i have to run a seperate one..

 

I think you misread aaron.

I TOOK OUT fuel in the low throttle map until it wouldn't run and then I added 3-4 %. I leaned it out at one point so far that it wouldn't rev above 3000RPM, unless I gave it enough gas to go to the high throttle map.

 

Holy crap dude, I wouldn't tune like that.. But glad it worked out for you :P

 

In my experience the stock one has always been rather accurate. It puts out between 0 and 5 volts. It's actually easy to convert Voltage to a pressure measurement.

Out(V) = 0.169V/psi*P(psi) + 2.318V


P(psi) = (Out(V) - 2.318V)/0.169V/psi

These formulas should look familiar to some of these. They were found by Paul Stokes and were part of a homemade FCD How To.

 

There's no danger in tuning the low throttle map, even in a turbo, by the seat of ur pants if ur gentle with leaning out. It's not in boost at low throttle anyways, if it's anything like the tII I drove once. Supercharged cars are pretty much the same way. Boost doesn't hit until the throttle is in at least half way.

Lean during no boost doesn't hurt the engine unless it has extremely high intake temps with carbon build up inside it, advanced timing and / or is in a poor state of repair. As long as no pings take place then it's all good.

On a side note, while tuning my NA which was running quite lean at times in the upper rpm range where all the power is, I never once heard or felt one ping, knock, funny sound, or anything abnormal. Not until I added some fuel did I realize that it was too lean on top.

 

My DSM community has been using the SAFC this way for a few years very successfully. Here is the article on the procedure. It is DSM specific, but hooking it up is the same. http://www.2gnt.com/www/corbin/foolafc.html



The use of a GM 3 BAR is the best way to go. You can pruchase one here for $85.

http://www.diamondstarmotorsport.com/elecparts.shtml

 

Dave, you da man..... I don't care what rat says......

lol

Adam

 

And you know this.....MAN! You know that all the new stuff you rotary guys come up with, we DSMers have already seen....A YEAR AGO!! J/K

Seriously, this has helped many DSMs out, and I think it will solve a major issue in the 7s TPS compatibility with the SAFC. Since the adjustments will be based on pressure, and not throttle input, the corrections will be much more precise. I believe this will yield a much better cruising map. A better cruising map will increase efficiancy, which will give better timing on spoolup, creating a broader torque curve, and ultimately will lead to greater power production. As a bonus, the car will behave better at low throttle and be much more fuel efficient.

 

Dale was doing this years ago, it's nothing new like you've said. It's just something that is really starting to catch on in the FC community. I've noticed that there seems to be trends that go around, and for the most apart most people are scared to try something different.

 

Your absolutely correct in this. People are very scared of new things. I will admitt that sometimes new things end up costing money. But i would still rather try it myself instead of being spoon fed. At least that way you can have an oppinion on something one way or the other. This "new" technique with the SAFC looks very promissing. Hopefully some will try it. Anybody in the Tucson area feel free to contact me about it. Im pretty good with the SAFC and a wideband.

 

I'd LOVE to try it.

All I do is hook it up to the AFM wire instead of the TPS wire?

 

YIKES!!!! That would be interesting though...

Instead of splicing into the TPS wire, you are connecting the grey safc wire into the pressure sensor 5v wire. This topic has been covered extensively in the safc section, it's probably one of the very first posts.

 

why can't I connect them both?

 

I don't understand what you're asking? The grey TPS wire for the SAFC can only have on voltage input coming into it. The pressure sensor gives off between 0 and 5 volts. On the safc screen it will be reading in TPS, but this simply stands for a certain voltage that you can corresond to a certain boost pressure.

 

You cant just hook it up to your stock MAP sensor. It wont work. You will have to use a GM 3 BAR MAP, like I posted in the beginning of this thread. The voltage to power the 3 BAR should come from then stock sensor power and ground because then voltage is very stable there(as explained in the article I posted the link to) I guess a 2 BAR MAP could be used IF boost will be under 1 BAR. I would still use a 3 BAR, just to be safe.

 

I will try to take pictures of an install on Jrats car when he is ready to do the install. We may even have dave report the results after the tune is down. I think Dave is up to the challenge.

 

The stock pressure sensor will work. I ran my safc tied into the pressure for over a year, and I'm currently tuning the e-manage with the TPS tied into the pressure sensor.

 

sorry, I forgot that the TPS wire was grey.

There are some extra wires with the SAFC, what are they for? (mine had no manual).

what I thought you meant was to connect it to one of the other (unused) wires.

 

I would not advise it. It may have worked for you, thats fine. The fact remains that you should not tap the stock MAP sensors output to the ECU. You can get a corrupted signal. A completely separate sensor used for nothing else is the way to go.

And if you plan to run over 1 BAR,(Im assuming everybody understands why this is) you really should have a 3 BAR MAP. Im trying to make this as easy for people as possible. Tuning will be much easier using the system outlined in the article.

 

How could tapping into a wire giving off between 0 and 5 volts corrupt the signal? Are you implying that the voltage received by the stock map sensor is not accurate, or that splicing in a wire could result in erroneous readings by the stock ecu?

Using a 3 BAR sensor actually lowers the resolution of tuning. Most people that are using a safc in the first place don't have an extensive mod list. Even those fc owners that do have rather extensive mods, most won't see 15+ pounds of boost.

I'm not trying to pick a fight, but the stock 2bar fc pressure sensor is perfect for most people.

 

Ok