S14 SR20DET Tuning help - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Ecsta-Z · 07-13-2015, 02:59 PM

Okay, to start off I have a 96 240sx with a S14 SR with very little modifications, (Isis Header, Z32 MAF, 550cc injectors, typical cold air intake, and a boost controller that is set at 10psi) nothing crazy, I also sent my ecu to Nistune and got a type 3 board installed. Now, I know some of you are thinking "why don't you just take it to a shop and have them tune it?" well I live in Broken Arrow, Oklahoma not one shop has heard of an SR20 let alone tuned one so that leaves me to figuring it out on my own. Besides who wouldn't want to know how to tune their own car anyway?

Now for my problem, the car will start up fine and drive but once the engine is up to temp it starts to idle weird, like revving between 300rpm and 1,300rpm. Also, it wants to run rich at any rpm, even while driving (between 10afr and 12afr). I asked one of the Nistune consultants what I should be adjusting on Nistune to try and remedy the issue and he said the K-constant TP Multiplier and the Total Injection Multiplier. So I began adjusting these with no luck. Now with no tuning background I am not sure where what numbers these should even be in the ballpark of but I've heard rumors of other tuners starting with a K-constant between 32,000 and 36,000 but nothing on the Injection Multiplier. I have also set my Nistune/ECU with the correct MAF and injector size so I'm quite sure those aren't my problem.

So with that said I humbly ask my Zilvians to give any reasonable advice as to what I should be adjusting in Nistune or any mechanical problem it might be, because I'm completely stumped.

cotbu · 07-14-2015, 09:25 AM

Pull codes, if none then check the cts. Matter of fact verify the ecu is working correctly by throwing a mafs code. Clear codes. If global adjustments have no effect like latency at idle, k constant or if your nistune version is new? Total injection multiplier then something is seriously wrong.

If you want to learn tuning you need to be able to comprehend, that means get the manuals for nistune then use google for terms you don't understand.

I charge for tuning and teaching, but there's no magic adjust this, and you are tuned option. So if that's what you're looking for good luck.

Sent from a Highly Tuned Note 4.5!!!

07-13-2015, 02:59 PM	#1
Ecsta-Z Join Date: May 2014 Location: Broken Arrow, Oklahoma Age: 32 Posts: 3 Trader Rating: (0) Feedback Score: 0 reviews	S14 SR20DET Tuning help Okay, to start off I have a 96 240sx with a S14 SR with very little modifications, (Isis Header, Z32 MAF, 550cc injectors, typical cold air intake, and a boost controller that is set at 10psi) nothing crazy, I also sent my ecu to Nistune and got a type 3 board installed. Now, I know some of you are thinking "why don't you just take it to a shop and have them tune it?" well I live in Broken Arrow, Oklahoma not one shop has heard of an SR20 let alone tuned one so that leaves me to figuring it out on my own. Besides who wouldn't want to know how to tune their own car anyway? Now for my problem, the car will start up fine and drive but once the engine is up to temp it starts to idle weird, like revving between 300rpm and 1,300rpm. Also, it wants to run rich at any rpm, even while driving (between 10afr and 12afr). I asked one of the Nistune consultants what I should be adjusting on Nistune to try and remedy the issue and he said the K-constant TP Multiplier and the Total Injection Multiplier. So I began adjusting these with no luck. Now with no tuning background I am not sure where what numbers these should even be in the ballpark of but I've heard rumors of other tuners starting with a K-constant between 32,000 and 36,000 but nothing on the Injection Multiplier. I have also set my Nistune/ECU with the correct MAF and injector size so I'm quite sure those aren't my problem. So with that said I humbly ask my Zilvians to give any reasonable advice as to what I should be adjusting in Nistune or any mechanical problem it might be, because I'm completely stumped.

07-14-2015, 09:25 AM	#2
cotbu Post Whore! Join Date: Sep 2005 Location: SWFL Age: 49 Posts: 3,318 Trader Rating: (3) Feedback Score: 3 reviews	Pull codes, if none then check the cts. Matter of fact verify the ecu is working correctly by throwing a mafs code. Clear codes. If global adjustments have no effect like latency at idle, k constant or if your nistune version is new? Total injection multiplier then something is seriously wrong. If you want to learn tuning you need to be able to comprehend, that means get the manuals for nistune then use google for terms you don't understand. I charge for tuning and teaching, but there's no magic adjust this, and you are tuned option. So if that's what you're looking for good luck. Sent from a Highly Tuned Note 4.5!!! __________________ LoverTechnologies "Half Broken Things!"