Nistune Forums

well here's some interesting developments looking around the internet i noticed that denso also makes a 660cc injector. for the hell of it, i ran it through the injector resize function, and the k value looked about right where i'd want to reduce it to. (305) so i figured i'd go and see if it would ...

did a bit more testing tonight. started out with latency 800us ***update: this is the correct starting point for r35gtr injectors. k reduced from 354(calculated by injector resize), to 348 (this was actually the oem value) returned tim from 390, back up to 512 cold start didn't want to catch, but it...

thanks matt. sorry for the information overload. in addition to asking all the questions, i've been using this post as an information dump, so i can refer back to it as i go. the info i got from the tuner about these injectors, is that they are out of a low mileage 2015 gtr. i have no reason to doub...

yeah, probably misinformation on the cc. PL was quite certain on the flow rate.

this latency value is kinda crazy though. i was getting afr in the 9's at first.

still sitting at 1100us for now. seems to be working well. i just need to finish dialing in tim and tp before i go back to latency now.

Shane001 wrote: ↑Sun Nov 08, 2020 9:04 pm

...all you do is plug the USB cable from the gauge into your computer, run the bridge software selecting either of the two com port numbers from com0com, then run Nistune and configure the AEM wideband to use the other com port number.

thanks for figuring this all out. connects perfectly.

oook, after a bunch more reading and wrapping my head around this stuff, i realize it's time to move on to adjusting tim. looking back on the last logs, i can see the trims at st: -6 and lt -10. this told me that reducing tim was in order. reduced tim from 512 to 400, and drove to work. trims are no...

thanks for this info guys. are all the r35 injectors 570cc? i see a few different numbers thrown around the internet, from 550, 560, and 570. mine are from a 2015. i used the 1780us number from below, and my idle was super rich. dropped to 1100, and afr is now close, but slightly rich. seems like if...

read a bunch last night, and went out again this morning. started up fine. so i suspected that the start issues i had yesterday had to do with the crank enrich at warm temps. increasing from 5 to 8 did cure that. connected the wideband this time, and took a few logs. looks like it's trimming about 1...

ok, managed to revert back to an older file, and start over. My maf cartridge is actually from a rogue, but it’s the same part number as the gtr maf. Not sure if that makes a difference. But it’s in a 3.5” tube with honeycomb straightener. I chose the gtr maf in 3.5 tube (444hp) ****update: wrong ch...

ok i think i spotted at least one of my issues. i think i ran through the injector resize more than once, and it looks like each time you do that, it changes the k constant each time, rather than reverting to to original, then writing the new target. so with that said, which option should i be using...

ok, never mind the question about the injectors. i test fit one gently, and it fit, so i installed them all. no leaks. they are indeed a direct replacement. so i've got the maf built, installed, and tested working. injectors on and running. **update** 7/4/21: below in this post, i mention the 2 diff...

Hi guys. I’m just doing my fuel injectors, and figured I should get some answers before proceeding. There’s a slight difference at the intake runner end. Shank length, and shape at the tip. Also, the old ones have these brown plastic seats that fit on the end. One broke and another fell off somewher...

dude! i can't believe i missed that. not sure it was an option the first time i was doing active tests. i updated nistune along the way.

thanks. that will make things much easier.

Bov is a gfb respons, so it’s possible that I have it adjusted a bit too tight. I should also admit that I have it venting 10-20% to atmosphere, cuz i love the sound. Hope I can keep it that way. I do have the parts for the r35 maf and injector upgrades. Just have to weld up the maf housing and inst...

Nistune_2021-05-19_1448_47.csv made this log file just now. looks to me like i'm creeping up to 10-11psi, then i run out of maf. injectors aren't far behind, at 90% duty cycle. looks like the boost spike at the end happens the moment i lift the throttle. maybe a bit of lag time on the bov... maybe ...