how should i tune / boost problem - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

s13sleepin · 04-02-2015, 05:56 PM

I'm wondering what's my best option , so right now im using stock ecu and no shops around me ( STL , MO ) say they can tune my stock ecu wich I had tuned by a shop in FL but its not good , wondering if I should go with an SAFC II and get it tuned or should I pay the big bucks to get a jwt ECU and some top feed injectors (555) pre tuned by them, anyone got any other subjections ? id rather not spend 1000 but if I have to for reliable power I will

Build: Ka24det .25 bore, port & polished heads , stock mani , SR injectors , 18g Godspeed turbo, z32 maf, walbro 255 pump, diamond pistons, arp studs

another question I have is that im having a problem with boost its set on 9 lbs with manual boost control but I cant seem to get it to get past 6 lbs? I used to go to 9lbs until I got it back from the guy who built it ( fans stopped while idealing in parking spot and I noticed when it should rad fluid out of overflow) it hasn't gone past 6 lbs since ... iv tried removing the manual boost control , still no luck only 6lbs tried adjusting actuator but its not adjustable also tried tightening my external BOV no dice so if you got any advise PLEASE HELP ! THank you

seagrasser · 04-02-2015, 06:08 PM

stop boosting until you get it tuned. you have know idea how much damage you are doing to the engine.

Get Nistune

EDacIouSX · 04-02-2015, 06:14 PM

nistune, aem, JWT... i recommend against SAFC since it does not tune timing. and yea, if you drive the car make sure you don't boost. I recommend you dont drive until you get a good tune

s13sleepin · 04-02-2015, 07:14 PM

well I drove it back and forth from work for like 2 weeks. the AFR's are perfect at all times only issue is the boost and it after letting off the throttle and ingugeing the clutch it will bog down to around 300rps or die if I do decent pull its running perfect Ill be driving my fox till I get it tuned now though. FML hope I didn't fuck my self ..

*anti tyler* · 04-02-2015, 10:09 PM

If your mass airflow sensor is on the turbo inlet you're going to bog down and die off throttle anyway, because when you let off the throttle the BOV lets out metered air. So you're essentially dumping out air the engine already accounted for.

s13sleepin · 04-03-2015, 01:15 PM

It is right after the air filter yes so should i be put I t on the throttle body side? And would that cause idle issues some times it'll bug up and down a couple times then level o it at 850
Thanks fir the info btw

04-02-2015, 05:56 PM	#1
s13sleepin Join Date: Apr 2015 Location: STL , MO Age: 27 Posts: 5 Trader Rating: (0) Feedback Score: 0 reviews	how should i tune / boost problem I'm wondering what's my best option , so right now im using stock ecu and no shops around me ( STL , MO ) say they can tune my stock ecu wich I had tuned by a shop in FL but its not good , wondering if I should go with an SAFC II and get it tuned or should I pay the big bucks to get a jwt ECU and some top feed injectors (555) pre tuned by them, anyone got any other subjections ? id rather not spend 1000 but if I have to for reliable power I will Build: Ka24det .25 bore, port & polished heads , stock mani , SR injectors , 18g Godspeed turbo, z32 maf, walbro 255 pump, diamond pistons, arp studs another question I have is that im having a problem with boost its set on 9 lbs with manual boost control but I cant seem to get it to get past 6 lbs? I used to go to 9lbs until I got it back from the guy who built it ( fans stopped while idealing in parking spot and I noticed when it should rad fluid out of overflow) it hasn't gone past 6 lbs since ... iv tried removing the manual boost control , still no luck only 6lbs tried adjusting actuator but its not adjustable also tried tightening my external BOV no dice so if you got any advise PLEASE HELP ! THank you

04-02-2015, 06:08 PM	#2
seagrasser Zilvia Member Join Date: Nov 2011 Location: Lynnwood WA Age: 46 Posts: 256 Trader Rating: (2) Feedback Score: 2 reviews	stop boosting until you get it tuned. you have know idea how much damage you are doing to the engine. Get Nistune __________________ S14 RB25

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04-02-2015, 06:14 PM	#3
EDacIouSX Post Whore! Join Date: Nov 2004 Location: Los Angeles Age: 35 Posts: 4,527 Trader Rating: (53) Rides Gallery: EDacIouSX Feedback Score: 53 reviews	nistune, aem, JWT... i recommend against SAFC since it does not tune timing. and yea, if you drive the car make sure you don't boost. I recommend you dont drive until you get a good tune

04-02-2015, 07:14 PM	#4
s13sleepin Join Date: Apr 2015 Location: STL , MO Age: 27 Posts: 5 Trader Rating: (0) Feedback Score: 0 reviews	well I drove it back and forth from work for like 2 weeks. the AFR's are perfect at all times only issue is the boost and it after letting off the throttle and ingugeing the clutch it will bog down to around 300rps or die if I do decent pull its running perfect Ill be driving my fox till I get it tuned now though. FML hope I didn't fuck my self ..

04-03-2015, 01:15 PM	#6
s13sleepin Join Date: Apr 2015 Location: STL , MO Age: 27 Posts: 5 Trader Rating: (0) Feedback Score: 0 reviews	It is right after the air filter yes so should i be put I t on the throttle body side? And would that cause idle issues some times it'll bug up and down a couple times then level o it at 850 Thanks fir the info btw