CA18 - Afc tuning question with 650cc injectors

A place to discuss the systems and methods of tuning Nissan engines.
fabio240
Posts: 501
Joined: Thu Apr 03, 2008 10:55 am
Car: S13 with ca18det

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will the afc be able to correctly tune my car with 650cc injectors and a z32 maf running about 18psi?


chillmieste
Posts: 381
Joined: Mon Aug 12, 2002 2:22 am
Car: 97 240sx KA-T
Location: Ft lauderdale

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I dont know if 650cc injectors are good for 18 psi or not but i wouldnt even mess with SAFC (if thats what ur talkin about) with that kind of boost. get a tune like megasquirt,tuned ecu (enthalpy, nistune, jwt etc), or some other method other than safc :)

boost_boy
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Car: B12 sentra w/built CA18DET, B12 sentra w/fully-built CA18DET, S13 coupe w/ CA18DET, S13 hatch w/CA18DET, 2002 maxima SE
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fabio240 wrote:will the afc be able to correctly tune my car with 650cc injectors and a z32 maf running about 18psi?
With the super AFC and the CA, you are asking for trouble. It's tricky, but if you must use a SAFC, keep the injectors at or around 500cc.

fabio240
Posts: 501
Joined: Thu Apr 03, 2008 10:55 am
Car: S13 with ca18det

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Im pretty sure that 650cc injectors are big enough for around 18psi from a t3.. But I also have a socketed ecu but Im not sure if I can get someone locally to tune my car...

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rc1honda
Posts: 585
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Car: 1992 240 sx
2007 BMW 335xi
2008 Honda CBR1000RR
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fabio240 wrote:will the afc be able to correctly tune my car with 650cc injectors and a z32 maf running about 18psi?
I wouldn't say it would do it correctly but it will help keep your A/F ratio in line. AFC's are good for injectors twice as large as stock. I think the CA uses 370's like the SR so it would be useable up to 740's. But again you really should just throw that thing in the trash and get a rom tune or a stand alone.

fabio240
Posts: 501
Joined: Thu Apr 03, 2008 10:55 am
Car: S13 with ca18det

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Ok because I already have an ecu that has been socketed so I guess Ill just try to find someone who can tune and burn chips

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PyR0NiAk
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Joined: Sun Mar 01, 2009 4:29 pm
Car: S13 SR W/ T2 GT3071R .86AR, JWT S4 Cams, 810cc Injectors,Z32 MAF, JWT tuned ECU 87mm 9:1 Compression CP pistons, Manley Rods
Location: Ohio
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fabio240 wrote:Ok because I already have an ecu that has been socketed so I guess Ill just try to find someone who can tune and burn chips
Good choice.

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float_6969
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Car: CA18DET swapped 1995 Nissan 240sx (too many mods to list)
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I wouldn't use an SAFC for those mods.

If you can get a dyno-tuned rom burned for your exact setup, you don't need the SAFC. If you can't, then get a chip burned for your mods (MAFS, injectors, etc), and use the SAFC to fine tune the fuel map.

niswiz
Posts: 91
Joined: Sat Oct 04, 2008 9:15 am
Car: s13 200sx ca18det powered

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i could not control my 560cc with the safc. remember it has a 50% adjustment each direction and standard is 370cc. u'd have to put a chip in the computer and then use the safc for fine tuning or like me go sds


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