SAFC (apexi fuel control)

[AJ]

A friend was telling me that he was reading some import magazine (i forget, he has a talon and knows his stuff pretty well.) &nbsp;Regardless, he was saying that there was an IS300 that got 10 more rwhp from an apexi SAFC which basicaly tunes the air fuel ratios. &nbsp;I was wondering what you all thought about this? (the IS300's only mods were intake and exhaust) &nbsp;They dyo'd it before and after the SAFC, and got that big of a difference.... &nbsp;(i'm thinking i might just need one if i could get 7 or so rwhp from it <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/wink.gif" border="0" valign="absmiddle" alt=';)'>)

kinda pricy... 320$ or so...

[crazycuban]

with an intake, it makes a difference...i used to have a celica, and one of the more common mods was a CAI w/ S-AFC...the CAI brought fwhp to 163 or 164, with the S-AFC it went up to around 170.

[yenpit]

with a tunable product like that it really helps if u have access to a real dyno, not ur butt dyno!

[S13Grl]

Does anyone have any actual experience with this product? My boyfriend is getting one for his 240 shortly, so I'd like to gather knowledge about it before he does. <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/smile.gif" border="0" valign="absmiddle" alt=':)'> I'm raping you people for car knowledge! Yeah!

[whateverjames]

i've heard they are good, but you really need a dyno or you can possibly hurt performance. it's only as good as the person using it.

i think that's what asad told me on the main 240sx email list.

[drift freaq]

they are supposed to be really cool but like previously stated you need a dyno to take full advantage of it and you need to know how to tune the air fuel curves it spits out. Which is a an art in its own right.

[240racer]

I have two friends that have used it, one on a Supra Turbo and one on a DSM turbo. &nbsp;They found it very helpfull, I may run one on my car when I turbo, but I'm not sure. &nbsp;Also, if you go to a shop with a dyno and they have S-AFC's on their cars they can probably tune it very well. &nbsp;I think it will benefit a forced induction more, but I'm sure it could help tune your N/A bolt ons. &nbsp;Also, They are pretty easy to use and can do a fair amount with the air fuel ratio, but you should use a wide band lambda sensor to get that right, the shop near me has one and they use it whenever they dyno.

[sspikey]

gotta be careful with these things. the manual even says its not responsible for damage caused by this product.

[yenpit]

just dont want to lean it out too much! too rich can eventually damage an engine too, but lean is BAD! if u have access to dyno, u really should do it. the manufacturers say that to cover their butts, if handled properly it can produce power.

[240racer]

Yeah you definatly have to be carefull when you start messing with that stuff. &nbsp;That's why you need to make sure you use a afr meter of some type. &nbsp;Wide band just work better but they are really expensive.

[fourg63]

I've been using it on my Eclipse GST for about 3 years now.It's very affordable and does the job very well.It's easy to tune on my Eclipse too.I use a datalogger along with an EGT gauge to tune.On a 240 I wouldn't even bother with it though.I wish an Eclipse ECU was reprogrammable like a 240 ECU.Unfortunately we have no choice unless we go full blown stand alone which is a bitch to tune.

[jupiterl]

Why can't we just get a air fuel ratio meter and a EGT guage , maybe also a ping monitor., and try to tune up the SAFC ourself ? It may not be as good as going on dyno., but it still help alot.

[fourg63]

The reason it isn't a good idea to only use an O2 voltage meter is because you're not seeing the whole picture.Every car is different so every car's perfect O2 voltage will be different.First you must know what O2 your car runs best at(without being lean).You must also take into account that not all gas is created equal which will also mean that perfect O2s will vary depending on gas.This is why it is best to have a logger of some sorts.It will tell you if your car is pulling timing because of knock.

[AJ]

explain what a logger is?...

[240racer]

The logger plugs into your ecu and logs the data into some kind of memory, usually a palm pilot or something (that's what my friend has) &nbsp;However, our cars don't use the same system so we can't use the logger (at least I can't with my s13) But Fourg63 has a good point, the reprogramable ecu is nice, but you want to make sure you have all your stuff done before that otherwise you have to get it reprogramed again.

Grr....I just brought a S-AFC over here in japan for $250.00 usd....can't wait to install it on my car....i'm prolly going to have my bro help me dyno my car when it;s install.

[AJ]

but reprograming ur ecu costs more than an Safc..

so basicly, if you don't have a dyno, you won't be able to tune it very effectivly.. So, for those of us that don't have a dyno in our back yard.. this option is pretty pointless without a turbo... is that the response i'm getting?

[fourg63]

A stock ECU should be able to handle BPUs without a problem.Once you turbocharge it, the ECU will no longer know what is going on.That is when you need a fuel computer of some sort.SAFC is a piggyback computer that intercepts the signal and fools the computer into thinking everything is fine and dandy.JWT computers are twice as expensive as an SAFC, but all the guesswork is already done.It's plug in and go, while the SAFC will require careful tuning.JWT ECU also comes with new ignition maps which SAFC cannot do.Also once you let JWT program your ECU, to reprogram it is only like $150(I think).Bottom line is:If you're doing basic bolt ons, your ECU should be fine.If you go turbo, JWT is the route I would chose.