Car: 2k2 Nissan Max 6spd
Tuning Device: Apex-i V-AFCII
Wideband o2: PLX R300

1. Whats a good AFR I should be shooting for narrow throttle settings? I kinda did some ghetto street tuning earlier with my friend...basically we was looking at the AFR gauge while I was driving it..and we were able to get the car in the 13.5 +/- 3 range (tuning thru the V-AFCII)....this is from 1500-4000 narrow throttle pulls (25% gas)....should I lean it out more and shoot for 14.7?

2. How is datalogging with a 2nd gear pull on a 6mt? It goes up to 65mph if I redline it...just wondering if I could get good AFR #s by doing a 2nd gear pull instead of 3rd (which goes up to 93ish)....Don't wanna get in too much trouble

3. On my V-AFCII, what exactly are these narrow/wide throttles? I mean I assume one is for part throttle, the other is for WOT...but when I went in for a dyno tune, I was going WOT the whole time....but I still ended up with narrow throttle maps...how am I suppose to know my narrow throttle settings if I am going WOT on the dyno/street?

basically any more info discussing street tuning would be appreciateD! thanks

 

I would only tune WOT. I would do 40%+ and 2000/2500 rpms +

 

what gear would u do it in?

 

I have no idea how lean/rich percentages work. I don't know what the car runs at normally anyways

 

It is better to do it in a higher gear. 3rd or 4th should be good. Just dont get caught... Since you can data log the AF, it should only take 2-3 runs to get it right.

 

Just do 3rd gear, or even 2nd unless you spin the tires in 2nd. You're NA so AFR isn't going to change in different gears much anyways, if at all, like it would in a turbo car that sees more boost in higher gears. Also 4th gear to redline would have you going really fast for a really long time, not exactly the smartest thing to do.

 

ya thats what I thought...4th gear takes me all the way to 120mph...I cant really find a road that takes me from 40mph-120mph in a slow @ss 4th gear....

I'm thinking about the 2nd gear pulls...its the safest bet so far since it only takes me up to 65mph....and I can always get on it during the freeway on ramps....lets see if my AFR is hard to read in a 2nd gear pull

oh yeah, can anybody answer the narrow/wide throttle settings?

 

Got mine installed this weekend also and got a few pulls done on the interstate on the way home.

Not sure about narrow settings with a 5.5 gen. I know only wide throttle changes will work on a 4th. I did notice the ECU likes to keep it at or over 14.7 in narrow.

 

That install is very slick man

 

I have every now and then heard when tuning its best to do it in the gear closest to a 1:1 gear ratio (ie 4th). Any truth to this?


3rd gear would be a good gear to tune in, as you wont go nearly as fast as 4th WOT to redline.

 

Tuning in the gear closest to 1:1 only matters when trying to compare your DYNO to different gear ratio cars. It kind of levels the playing field. Most just use whichever gives the higher numbers.

3rd gear gives a long enough data sample to tune with...2nd is kind of short and 4th on the street isn't practical at least on the 5spd.

 

Never thought about putting the M-300 there. Mine is right on top of the steering column and it fits okay but looks out of place.

 

4th would be the best either for street or dyno....if you have the room to do it, use 4th...I know some of ya'll live like in the middle of nowhere....as for me, I live in crowded southern california...

if I want to use 4th, I'd have to do it real late at night...and be real careful

 

In NA cars it takes way too long to run 4th all the way out to redline, completely pointless imho, and it gets more and more dangerous the longer you have to maintain those high speeds.

 

dangerous as in....crashing or blowing up the motor? I understand crashing or getting arrested by the police....but I don't see these VQs blowing up from a couple of highway runs...I've done it many times and not a single problem with my engine...no oil consumption or coolant leaks etc...

I mean all I'm sayin is...if u have the room and guts to do a 4th gear pull...go for it....it will give u the best AFR reading....3rd should give a clean run as well...but if u want the absolute best, 4th is the way to go....right neal?

 

On the dyno my A/F was different between 2nd, 3rd, and 4th gear. The A/F got progressively richer in scale with every gear increase. The dyno operator (Darren @ R&D Dyno) suggested that since the car was on more load with a higher gear, the A/F was richer

 

Thank you, I thought I was loosing my mind when trying to tune mine. I noticed it was lean in 2nd & 3rd at the same RPMs but right on in 4th. Doesn't make sense for tuning purpose though... means I'll run either lean at the track since I never hit 4th or be super rich on the highway in 4th & 5th if I try to kick it or pass.