Nistune and Running problems!

[ooter]

Ok, so first off is I need some help with someone in the Vancouver area!
I have the nistune board in my ecu, not the one that you can only put a chip in, but the programmable board. I have nistune on my computer and i had the datalink cable, but that got jacked from my car.
I have to get it through air care but i failed terribly, my friend will put it through for a conditional pass but i know my car i running Way to rich!

So what im looking for is someone that has a link cable and knoledge of the nistune software! I just installed a aem afr gauge and need some help just doing a base tune! i know my car could be running Soooo much better but i need some help!

Second thing is that when im cruising my boost gauge kinda jumps back and fourth a little and i can hear the recirc valves opening and closeing.
any ideas what could be wrong?

thanks guys!

[Skym]

Did you download maps from your computer or use one of the maps in the ROM pack??? It's best to use maps from your cars computer, as I have found the stock maps for my car (R32 GTS-T) in ROM pack was modified. It has been fixed for R32 GTS-T models, not sure about others.

If it happened straight after board was installed, then board might have been installed wrong and ECU might be in Limp mode where it runs rich and where you can't access ECU via Consult.

Or ECU is running on knock maps, where it runs rich.

[ooter]

the maps are customized, not downloaded. the guy who had it before me had is socketed for a nistune chip cause of all the work that was done to the car (turbos, injectors etc).
but i got a actual board installed so i could tune it myself.
i dont think its running on knock maps, its just not tunned yet. it was really lean before so now its tuned to be rich, but i think its way to rich.

[ooter]

so no one knows the nistune progarm?

[Skym]

You have to see what's been adjusted for injectors, MAF, etc and see the other parameters that you look at when engine is running on a dyno, what mods have been fitted, etc to determine what needs to be changed on fuel, ignition maps.

I would suggest a Nistune dealer like Ztune if you can get to one, as it sounds like from what you have described, you need a experienced factory ECU tuner and dyno to adjust the ECU tune properly.

[judasentinel]

I know Nistune but I'm in Toronto. So its hard for me to do anything beyond offering suggestions. Like Skym said, you have to check the different settings on your Nistune software. But let's start with somehow getting you a CONSULT cable. Ask around. Im sure someone around your area would have one.

Once you get the cable and hook your computer to the ECU, hit me up on here. Or pm me and I will send you my phone number. I will go through the stuff with you on the software to see what is happening. Im no expert but I will try my best.

There is also one more thing you can do in order to get the absolute stock maps for a GTR. Go on the Nistune website and look for stock maps. They have them there. At least I remember seeing them there when I downloaded my software copy a few years ago.

Anyway, if you need to go stock, that is the best way - get CONSULT cable, download the stock maps from Nistune website, and then upload them to the ECU.

That sound you're getting of BOVs going off and on, seems to be turbo shuffle. Its hard to get around it without modifying your Twin Turbo (F) pipe or advancing the ignition timing a litle bit. But wait, dont do that without going back to stock ECU settings. You dont know what maps you're running right now. While the physical timing on the car may be 20 degrees BTDC (stock for a GTR), your ECU may be advancing or retarding it based on the maps in place. So get the stock maps in place on the ECU and then we should talk more.

Hope this helps

[ooter]

So i dont think its turbo shuffle, doesnt do it when i shift, only when im cruising, i think it has to do with the bov.

so i have my car running now with the afr gauge, when idleing its aroud 15:1, but when im under boost its around 10:1, way rich. or is this rich?

[Skym]

12.0:1 is lean (as far as you would want to push A/F ratio on pump gas with stock engine)

10.0:1 is rich

Should be at least 11.6:1 (safe A/F ratio) from peak boost at lower rpm's to peak hp. Idle should be around 14.7:1 with stock engine. To me it sounds like injection multiplier might be adjusted wrong if rich up top, lean down low. Or fuel maps are adjusted that way.

[markc32]

should be lean at idle for gtr's so anything above 14.7:1 ur ok...then should lower to rich mixture n up

[Skym]

It might be with slightly higher idle rpm.

[ooter]

hmm, ok. whats weird is before i got the af gauge i thought it was going to be really rich at idle cause when its idleing for a while it smells really really rich. would it being to lean make it smell like this?
yea i know the maps and such hvae been messed around with, thats why i need to get a
cable and someone who knows this stuff.
and i noticed about when im cruising and it starts going on and off boost like the bovs are dumping for some reason, the gauge goes from around 12 to 17 back and forth. kinda weird.

[judasentinel]

hmm, ok. whats weird is before i got the af gauge i thought it was going to be really rich at idle cause when its idleing for a while it smells really really rich. would it being to lean make it smell like this?
yea i know the maps and such hvae been messed around with, thats why i need to get a
cable and someone who knows this stuff.
and i noticed about when im cruising and it starts going on and off boost like the bovs are dumping for some reason, the gauge goes from around 12 to 17 back and forth. kinda weird.

That, my dear sir, is a clear sign of turbo shuffle as far as I know.

[cbileske]

yeah that is turbo shuffle.

[ooter]

huh, thats weird how its doing it now but wasnt before...so if i took my recirc right out and put a block off plate, it would only get worse? unless i put a balance pipe between the two?

[judasentinel]

ooter, BOVs are ideally designed to work only when you let go of the load - decelerate. Turbo shuffle happens under load. The two are in a way mutually exclusive in terms of when they happen. The exception is when the BOV is messed up, it will blow boost off under load, so you wont see too much pressure building beyond the point where the the BOV spring lets go. If your BOVs are screwed, you will not only be getting turbo shuffle, but will also see yourself losing boost after a certain psi.

Block off plate wont help avert this phenomenon, as you need to vent the excess pressure somewhere - either recirc back between MAF and turbo, or atmosphere.