Nistune Forums

Tested the car with removing the BOV. By placing a valve (rubber ball) on top of the BOV flange. At first it seemed to work but the problem is still there.

It looks like i''m running out off options, of what the problem is.

Hello Robbert, have you tried bypassing/removing the BOV yet ? (like I suggested some time ago, when you came to me for advise) ..I think you're forgetting to mention the lean condition is usually accompanied with a hissing/surging sound. i did not remove the BOV yet, i need to find a way to block ...

Trying to get extra fuel in the engine but nothing seems to help.

What if there is something wrong with the ignition @ the specific piont @ 3200 rpm? What AFR would you see when there is a missfire. I'm assuming a lean AFR because the oxigen inside the cilinder is not used for combustion.

I don't have this file because I bought nistune when the problems occured. Maybe my tuner has this file.

I''m not trying to give the right answer but i just want to think about it so that i understand nistune better. Could it have something to do with the injector latency value. Because this is a fixed value i am assuming that Changing K factor and injection multiplier has no effect. What i'm trying to...

Very good question Torque.

As i am new to tuning and nistune a lot of things are hocus pocus to me. I am following a training @ HP Academy and that made a lot much clearer.

When scrolling through all the maps/scalers a lot of questions came up. So with this post one question answered.

Thanks

Thanks for the advise Matt

I've ckecked the fuel pressure with a pressure transmitter on the FPR. The fuel pressure looks nice and stable. 2.95 Bar with vacuum hose FPR disconnected @ idle. 2.35 Bar with vacuum hose FPR connected. Vacuum pressure -0.6 Bar. (2.35+ 0.6= 2.95) 2500 RPM : FP 2.56 VP -0.40= 2.96 Bar 3000 RPM : FP ...

Just to be sure. Performed a smoke test today @ a local workshop to find any leaks in the intake, that i maybe had overlooked. No leaks found. The guy who performed the test was a little bit frightend how airtight my car is. Even the screw of the idle control valve was not leaking. that's one of the...

Hello Matt,

Thanks for looking into my issue, and i will try to do the adjustments as you mentioned.

I also will look @ the fuel pressure.

Hello, I don't know about our BOV setup ... but generally BOVs and MAF systems are contradictory because the BOV vents metered air away from the system. Yes, I know but this is only when closing the throttle (It's like an air leak) This however should create a rich condition, not lean so I presume ...

Hi there, THX for looking into my issue. I want to say that the tune is not done by myself but by my tuner, i'm not that experienced enough that i want to do this myself (yet) What AFM is in the car? It's the Original MAF for the R33 GTST Green Sticker You mentioned a BOV valve? It's a HKS SSQV What...

Hello Matt, Here are the files. Hope you can use them. From 2:25 minutes you can see the best what is happening. I understand what i have done with changing the latency. When the problem occures the injector opening time is falling back 0,6ms because of the STFT is going from 21% to 0%. I have compe...

Have you checked that AFR ratios in the map are in line with real world AFR? (e.g. setting all values in the map to 12AFR (disable closed loop) and then check what the WB indicates? Do you mean AFR auto tuner ? When i look in map view the AFR the wideband is showing is almost/or the same as showed i...

I've been driving around today to do some testing. What i found is that the injector latency is set to 700us in Nistune. But the specs of the injectors show 1.3ms/0.7ms opening/closing time. At first i changed the latency to 1000us. This worked a little but not enough. Then i changed latency to 1300...