Do you mean the VIAS kicking in? WOT is just when you put the pedal to the metal and you can set the switch over points at what percentage of throttle the VAFC uses which of the two tunes.

Also what wheels are you running?

 

So I installed my SRI with BBM and I use the setting 1 in 4 out. Talk about lean as hell. I had to adjust like 27+ on idle and 15+ adj throughout the whole band on narrow setting. Wierd thing is I didn't had to adjust the setting on Wideband. It was perfectly tuned 13.2-13.5 on WOT.

 

when you tune the throttle you went to low throttle under lvt and tuned from 1000 rpm?

 

yes the vias. sorry about that. i set the switchover point lower and what it does is actually stop the vias from kicking in. but im sure its a setting in there i have backwards

 

im assuming your not talking to me

 

Ever since i got my cat back exhaust system, i have gotten less power after 3800 rpm mark. I would feel the acceleration before 3800 rpm and after it takes time to get to 6 or 7..... when i bought the car, it had no problem going to 6 or 7..... its struggling right now... any ideas?

 

??? how does this relate to a bigger MAF?

 

tedo i need you to chime in. could you go into more detail as far as the tune on the bbmaf. its strange cuz depending on how i set the sensors the engine will be a brick at different spots. have you dynoed or gone to the track with the bigger housing?

 

Have you tried 1IN/4OUT rayac88?

I can semi relate to tedo's post in that I had to adjust exactly +27% @ idle, and anywhere from 12-15% everywhere else.

 

yea but i just don't feel comfortable with the car running that lean while im driving it even if its a short time to tune. but i will try that probably tomorrow. does the car bog down at any point or does it ride close to normal?
nmex have you tried the tune yourself with those settings?

 

It was like yours, really strong and then hit a wall, sort of intermittent like that. Here's how my graph looked when WOT after changing to the correct IN/OUT, notice the freakin lean spot there.
http://forums.maxima.org/4696180-post1.html

It was only for 0.4 seconds that it was lean but still, I get you.

 

im sure that lean spot can be fixed through the nepoint but that was with an safc what about with the vafc2? i really wanna get this car running so i can see if the larger maf is worth it or if the one i have is too big

 

Would it be dumb if I did the samething??? 1in 4 out 27%@ idle and 13 throughout???. I just won't be buying a wideband right now til probebly late september

 

its not a good idea cuz u wont know where your afr will be and it could feel like its running good but be running lean. im going to try it tomorrow and i should post and see how it goes but i wont be able to get definitive proof until i tune it and get my car to the track

 

keep us posted bro man

 

@rayac88

since you are afraid of the risk of running lean when turning the car on, why don't you preventatively add +30% fuel across the band and use that as a baseline and then see what the AFR is and then subtract fuel? Running rich is supposedly way safer than running lean so that would be the solution.

 

Nmex, keep linking those old threads as you see fit. I didnt realize how much I missed back then when I wasn't into engine[control] mods as much as I am now.

Everytime I think I have a complete understanding of something, I find something that sets off the lightbulb in my head. I cant wait till that wideband comes. It should be here the end of this week. But then I still have to get the bung welded in.. I can get the rest of my B-pipe done at that time though

I'm pretty positive I can get this to work when it does come in though.

 

i finally just took the risk and set it. im damn near there. i have some tuning to do after 5k but its raining cats and dogs so i dont want to hydroplane into a wall. i did set the 1in 4out and tuned idle and narrow throttle up to 4k and high throttle up to about 5k. it going pretty well but....
i found a defect in my setup. i need to find some 3.5" couplers cuz right now the air in coming in from a 2.5" cone filter which opens up into the maf housing. so i will be ordering the couplers from autozone probably and it may not be til next week that i get them but the track may be a possibility this friday again to see if there is gain.
.... i took it out cuz i need those couplers to make the tubing stay on and work perfect

 

great progress bro man... make me wanna chance mines... damn it i wanna do this mod asap

 

Honestly, I used couplers from Lowe's/Home Depot. Big ol 3.5" OD items in the plumbing section.



Although after a second look, it was only from the TB to the LRMAF, the other was a reducing coupler I got from E55AMG2.

 

mocef gave me a great idea... can i not just install the intake at the dyno shop and get there wideband to get my idle fine

 

Sounds ideal especially if you don't have a WB currently. I'd still plan on getting one though. Just to sleep better at night.

 

i wish i would have seen the post about the lowes couplers earlier. how much were they? i just got back from autozone and ordered some for $12
nmexmax is yours working fine with the vafc2?

 

I don't have a VAFCII. SAFCII here. Don't remember but Si ricer couplers are alway\ overpriced. IIRC mine was less than 5$.

 

well if i need another one ill go to lowes. i didnt see it on their website but maybe they have some at the store.

 

Sorry for the late reply. I've been busy with work. Yes I did correction from 1000RPM lvt.

 

No I haven't went to the track yet. Okay so I'll tell you how I have it setup.

Sensor IN - 1
Sensor Out - 4

For doing dyno I'm waiting for some other parts to get here for install and then I'm doing dyno. Hopefully I should see my numbers around 250ish. Let me know what rpm spots you have your LVT and HVT set. I noticed after I put the bigger housing is my lower end torque is much much better. I play with the vafcII for like an hour and then another half for tuning. It's worth the time though car is so much healthy and powerful.

 

i will be buying one for a fact, however i plan to take a trip to vagas soon so its most likely gonna be after that trip which is in october and i know ill definately loose interest by then

 

I'm still learning the afc I haven't turned on the switch point on the high and low cuz it kept bogging me down but I did feel the gains down low but it may have just been cuz it was cooler outside. I think I'm the only 3.0 in this forum I think the rest of you guys have 3.5. track on friday I think for me assuming I can get enough time to tune there and that my coupler gets here on friday.I'm trying to get my 60' times down and hit 10.0 1/8 mile

 

mind sharing the whole VAFC setup???

 

VAFCII SETUP

SETTING:
LVT Wide & Narrow
Ne1: 1000rpm
Ne2: 1500rpm
Ne3: 1900rpm
Ne4: 2300rpm
Ne5: 2600rpm
Ne6: 2800rpm
Ne7: 3000rpm
Ne8: 3200rpm
Ne9: 3400rpm
Ne10: 3600rpm
Ne11: 3800rpm
Ne12: 4100rpm

HVT Wide & Narrow
Ne1: 4200rpm
Ne2: 4400rpm
Ne3: 4600rpm
Ne4: 4800rpm
Ne5: 5000rpm
Ne6: 5200rpm
Ne7: 5400rpm
Ne8: 5600rpm
Ne9: 5800rpm
Ne10: 6000rpm
Ne11: 6200rpm
Ne12: 6400rpm

V/T Cont
L->H: 4100rpm
H->L: 4000rpm

V/T Unmt
Hi<<L: +10%
Lo<<H: +10%

Throttle
Narrow: 10%
Wide: 40%

ETC:
Sensor No.
IN - 01 OUT - 04

Car Sel:
Cyl - 6 , Thr - /, V/T - 1

Disp Scl:
Pr:
Ne: 7000rpm
Cr: +-3%

Warning Set
Prw: OFF
RevW: 6500rpm

 

Question regarding the safc as im looking to finally do the bbmaf. would getting the gen 1 safc be a waste in regards to the bbmaf as i can get a safc I for cheap or will this only work correctly with the safcII

 

IIRC, the SAFCI also has the IN/OU just like the SAFC II. One way to verify is find a SAFCI .pdf wiring diagram manual and see if it has the Q45 as a sensor option.



That's great, we appreciate this!

 

^^^ ill check that but i was wondering on how the II has i think the 24 positions and the I just has 12. would that make a huge difference.


http://www.apexi-usa.com/content/pdf6135.pdf

on the manual on pg. 31 it has the inf q45 from yrs. 89-97 in which that states a hot wire as well. so it states it would be 1 in but where do you find what out would be? So in essence it seems this may work for adding the BBmaf. This is encouraging.

 

SAFC1 does work since it has the same sensor configuration as the SAFC2.

SAFC1 manual linked here -> http://apexi-usa.com/content/pdf6135.pdf

 

is there a difference in them such as gains. ex. if someone like Nmexmax has the safc2 and switched to the safc1 would he experience the same power gain as the safc2?

 

Thanks to tedo this should officially be a sticky

 

As long as the AFR is optimal you will see the same power gain on the SAFC1 than on the SAFC2. Which in this case the AFR is mostly unchanged when running an SAFC + BBMAF, since it does a better job of rescaling the MAF signal than the VAFC.

 

agreed
im gonna search now on the install and such but since ill have this first then the dyno will be aways away, is there someone that has what the settings should be for vq35 that has just these mods (so its a "safe" tune before it gets tuned on the dyno):
test pipe
bbmaf
sri
vias delete

 

I don't see why not.. if its adjusted to the same AFR then I don't see why the gains would be different based on the tuning device