KA-T tuning help - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

khoadogg · 04-23-2004, 12:27 PM

Currently on my '89 155k mile KA24E-T, I'm running:
-T3 snail
-turbonetics 7lb wastegate
-SARD atm BOV
-2.5 in turbo back to TRUST SP full catback

I'm installing later today an S-AFC, 10:1 FMU and FMIC. I'm still waiting another week before I can get my 440cc injectors w/ custom fuel rail and B&M fpr. How will this run since I've only hit 5psi on halfthrottle? What else should I do before I tune? Are there any settings I can do to drive around until I install everything for the dyno? My car just sits there because I'm still waiting on exhaust wrap and an AFC to run my atm BOV. Anybody know how to set the AFC initial startup? Should I just get other injectors that are easier to install and save for a bigger fuel pump?

andrave · 04-23-2004, 01:28 PM

you need a new fuel pump to run larger injectors, and I wouldn't even run an FMU without one. I'm surprised the car runs at all on a 10:1, thats hella lean. I don't understand what is gonig on, cartech FMU, safc, and a b&m regulaator, all with 440's???
too much crap. you need larger injectors + afc, or stock injectors and FMU.
at 7psi you would prolly want something to adjust timing too.

*Jeff240sx* · 04-23-2004, 01:33 PM

Andrave. 10:1 A/F is "hella" rich, not lean. But that doesn't matter.. because it's a 10:1 rising rate fuel pressure regulator.
RRFPR + S-AFC = Hard to tune. And you'll need to retune if you add another pound of boost because your A/Fs will be off. Remove the FMU (RRFPR), add a Walbro pump, and go off the S-AFC alone.
-Jeff

khoadogg · 04-24-2004, 08:01 AM

The FMU is just to limp me around until I put the 440cc's in. Until then, the AFC is so I can run a atm BOV and the FMU since I have stock injectors. Man, dyno time is expensive around here, $185/hr. Anyways, I just have to limp on something until I get a job. Baselines are hard to read, anybody have it explained in laymen terms for the S-AFC? And the a/f isn't 10:1. The fuel pressure regulator is 10:1. The fmu's going after I put the injectors in because the AFC is taking over fuel. What can I set the fuel curve at with stock injectors?

ftrs13 · 04-26-2004, 03:08 AM

wow, you guys get screwed for dyno. I found a place around me for 50 bucks an hour, after 75 for the first one, with a/f testing

04-23-2004, 12:27 PM	#1
khoadogg Nissanaholic! Join Date: Oct 2003 Location: San Jose, CA Age: 41 Posts: 2,423 Trader Rating: (11) Feedback Score: 11 reviews	KA-T tuning help Currently on my '89 155k mile KA24E-T, I'm running: -T3 snail -turbonetics 7lb wastegate -SARD atm BOV -2.5 in turbo back to TRUST SP full catback I'm installing later today an S-AFC, 10:1 FMU and FMIC. I'm still waiting another week before I can get my 440cc injectors w/ custom fuel rail and B&M fpr. How will this run since I've only hit 5psi on halfthrottle? What else should I do before I tune? Are there any settings I can do to drive around until I install everything for the dyno? My car just sits there because I'm still waiting on exhaust wrap and an AFC to run my atm BOV. Anybody know how to set the AFC initial startup? Should I just get other injectors that are easier to install and save for a bigger fuel pump? __________________ AIM SoarinStrong[B]STRONG 6iX[B] RB single turbo ///Work AMKREAD 180sx

04-23-2004, 01:33 PM	#3
Jeff240sx I hate you too... Join Date: Jul 2001 Location: Tampa, FL Age: 42 Posts: 5,828 Trader Rating: (0) Rides Gallery: Jeff240sx Feedback Score: 0 reviews	Andrave. 10:1 A/F is "hella" rich, not lean. But that doesn't matter.. because it's a 10:1 rising rate fuel pressure regulator. RRFPR + S-AFC = Hard to tune. And you'll need to retune if you add another pound of boost because your A/Fs will be off. Remove the FMU (RRFPR), add a Walbro pump, and go off the S-AFC alone. -Jeff __________________ Whatup?

04-24-2004, 08:01 AM	#4
khoadogg Nissanaholic! Join Date: Oct 2003 Location: San Jose, CA Age: 41 Posts: 2,423 Trader Rating: (11) Feedback Score: 11 reviews	The FMU is just to limp me around until I put the 440cc's in. Until then, the AFC is so I can run a atm BOV and the FMU since I have stock injectors. Man, dyno time is expensive around here, $185/hr. Anyways, I just have to limp on something until I get a job. Baselines are hard to read, anybody have it explained in laymen terms for the S-AFC? And the a/f isn't 10:1. The fuel pressure regulator is 10:1. The fmu's going after I put the injectors in because the AFC is taking over fuel. What can I set the fuel curve at with stock injectors? __________________ AIM SoarinStrong[B]STRONG 6iX[B] RB single turbo ///Work AMKREAD 180sx

04-23-2004, 01:28 PM	#2
andrave BANNED Join Date: Apr 2002 Location: Burton WV Posts: 2,350 Trader Rating: (0) Feedback Score: 0 reviews	you need a new fuel pump to run larger injectors, and I wouldn't even run an FMU without one. I'm surprised the car runs at all on a 10:1, thats hella lean. I don't understand what is gonig on, cartech FMU, safc, and a b&m regulaator, all with 440's??? too much crap. you need larger injectors + afc, or stock injectors and FMU. at 7psi you would prolly want something to adjust timing too.

04-26-2004, 03:08 AM	#5
ftrs13 Leaky Injector Join Date: Jan 2003 Location: Pittsburgh Posts: 68 Trader Rating: (0) Feedback Score: 0 reviews	wow, you guys get screwed for dyno. I found a place around me for 50 bucks an hour, after 75 for the first one, with a/f testing