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Originally Posted by ILLegit420aT
why? what possible reason could there be to not use an safc on a boosted car?
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For starters...
Quote:
Originally Posted by DR1665
SAFCs don't really do shit for 2GNTs. The ONLY time I would suggest someone with a 2GNT consider an SAFC would be if they had aggressive cams and needed something cheap to lean out their idle a bit. The MAP set up we have means using the SAFC to add fuel at any point isn't happening.
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From what I've read, my understanding of it is the SAFC reads vaccuum/boost through the map sensor. Our map sensors don't like to see boost so people either use a missing link or a FCD to prevent the map from seeing boost in order to prevent fuel cut. Anything over 5v to the map (i.e. when it sees boost)and you fuel cut. Therefore if the SAFC is taking it's signal from the map which is being fooled into not seeing boost then you can't make any adjustments when in boost because the SAFC will never know you're boosting.
The only thing this makes me wonder (because I know nothing about electrical) is if you could wire the safc to the map and then wire the fcd after the safc. Soo it would be Map---->SAFC---->FCD---->ECU. I'm not sure if the problem lies directly at the map where that would not work, because of the way the FCD and or SAFC has to be wired or what?
Usually people only use it for tuning our cars out of boost. As said by Driggs above, people use it to lean out their idle. With DSM 450's like your profile states, I could definitely see wanting to use it to smooth out your idle and out of boost driving, but once you get into boost, well it doesn't do any good. Not to mention with the cost and info available on MSnS it's become the ideal way to go. I'm headed there but have yet to research it as I know it's going to take a lot of time and learning and I think that's what deters most people. There's a local Miata guy using MSnS and he said he had to carry his laptop with him everywhere for the first few months he had MS installed b/c of having to make adjustments here and there in case for some reason his car wouldn't start or would run like crap.
I'm surprised that with a low 13 sec slip you're unaware of this. BTW what psi was that run on, I'm always interested in seeing what people can do with these cars on the track?
edit: I don't see an FCD or ML in your profile. If you're one of the lucky few whos car for whatever reason runs fine without either, then I don't see there being a problem using the safc as long as it is seeing boost from your map
right now im having wiring issues where my fusible link for the engine circuit keeps blowing key on engine off. i did get it around the block, but it got progresssivley worse. im puzzled, i know that link controls the fuel pump circuit. are walboros known for any problems like this? im doing my best now to figure it out and sell the car.
