I wanted to know if any of you data logger guys have figured how much of an impact each setting of an SAFC has on the a/f? For example "-1%(corection)=0.x(result on a/f)"

I will be tuning the SAFC myself at the next dyno day at the end of this month. But I want to have an idea of what the magnitude of the settings are. My a/f is mostly linear so it should not be hard at all to tune it.

Sorry I will post a pic tonight, but this is my a/f line (I will tune from 3500-to redline, I want to get it between 13.0-13.5:1):
2.5k@13.5
3.0k@13.5
3.5k@12.8
4.0k@11.9
4.5k@11.4
5.0k@11.9
5.5k@12.1
6.0k@12.1
6300(wtf)@11.9

Thanks in advance for the inputs

 

im interested in this also, bump.. lol

 

It's been my experience that to get an 11.9 to about 13.5 will take about 10-12%. Your mileage will vary and I do not have anything more detailed than that.

 

Hey thanks matt, I'll go play with the setting when I get out of work, but I wont go passed -8% just to be on the safe side til dyno time.
I doubt it will do any noticeable effects to my milage, since I'll only be doing the settings at hi-throttle. I only go WOT about once every 2 days cus of gas prices...(or when a ricer needs to be shot down at the light ) so my milage should remain mostly constant.

 

how do u wire one of these things up?

 

With lots of patience and some electrical know-how. Apexi has the installation instructions on its website, and you can get the pin layout of the ECU from the FSM

 

please post your before and after tuning results from the dyno! I would like to know the optimal A/F's and settings as well! I will still do it on the dyno, but I just wanna see if the SAFC is worth it since really it's been proven on the 3.5L 5.5 gens do give great gains, but I don't think anyone has ever shown the gains on teh 3.0L

 

I was working on that tonight actually. Too bad we were pwned by the sorry stock fuel pump that wouldn't hold pressure.


And everyone needs to simply forget there is a SAFC-II. The VAFC-II is better.

 

Because it controls the Variable Intake?? Someone locally has one for sale brand new for 270. I thought I saw them on ebay for 250 shipped.

 

there is a thread in the dyno section of before and after from when i got mine done.

 

And yours still isn't finished.

 

Nope. It has upto 24 tunable points vs. 12.

 

maxmale...but was that safc tune done on your 04 max? cause we all know the huge gains on a 3.5L but not on the 3.0's...

 

Just to clarify, but aren't the "huge gains" only gonna come on cars with pretty messed up AFRs to begin with?

I doubt that ALL VQ35s gain the same amount of power from proper tuning. The AF mix seems to vary a lot from car to car (regardless of whether they are stock or modded) and so some are going to gain more than others.

 

that is true. mine was running 11:1 after 4k so the gains from tuning would be greater than someone already running 13:1. if my fuel pump would have been up to the task then i would have more specific info. the walbro should have that fixed soon. mine is obviously a 3.0 but the principle is still the same.

 

I may sell my SAFC now ...

 

hm didnt realize the advantages of the vafc....

 

Swap you straight up for the Progress springs...

 

It sounds like the stock fuel pump can't hold pressure to provide true information for proper tuning with the SAFC II on the 3.0 L. How come this happens?

 

A worn fuel pump won't be able to make sufficient pressure. This is not typical of a fuel pump that's working properly.

 

very interested

 

what was mentioned above is true. mine has 70k hard miles on it.

 

Hey all, I'm a long time altimas.net member and I've come to a point where you all have much more knowledge about the VQ35DE than the guru's back on my forums.

**To note, the 15 post limit is difficult for anyone to search or ask questions within this wonderful pleathora of information!! Killing me!**

To start I have a 2004 Altima 3.5SE 5spd with I/H/E/P. Simple bolt ons, nothing special compared to others here. Currently putting down 236whp and 234 ft/lb with the above mods.

With the new camshafts and Kinetix intake manifold coming out I really want to get into getting a piggyback unit setup to tune my A/F with the possibility of ignition timing adv / rtd ability.

I have a long sob story about trying the SMT6 so I'll spare the details as I could make it span about 3 full pages.

My current options are:

* I have a Perfect Power SMT6 unit already wired to my ECU. I had to clear the settings in order to take ownership of the unit. Now that I lost my initial global settings I have failed in all attempts to get the car up and running on the SMT6 with zero'd out fuel settings. Bob@IDA wants nothing to do with me because I bought the unit used off a previous customer. I need a SMT6 guru to assist me with configuring the unit on my VQ35.

* To replace my SMT6 I picked up a Apexi S-AFCII. This was my fall back plan in case the SMT6 project failed and I needed SOME tuning to get me going. If no one can help me with the SMT6 I'm going to rip it out and use the S-AFCII.

* I read a post that the V-AFCII was far suprerior to the S-AFCII due to the tuning points (12 compared to 24). I like this idea, does anyone have the V-AFCII installed on a VQ35DE?

* I'm also considering the Technosquare L-Spec flash but I have a 2004 which isn't listed as being compatible on the Technosquare website.

Here is my goal:

I will be adding the Kinetix intake manifold, new camshafts (Check eBay post), and hopefully the Technosquare L-Spec to get my RPM limiter up. I really would like to tune my A/F ratio and my ignition to take advantage of the raised limiter and larger volume of air my VQ will have soon.

Email - velicos@ucfgaming.net
AIM - cteague711

Would really appreciate any help!

Thanks in advance,

Vel

 

Sounds like you've been around the block with piggybacks so you may not want to spend more money, but there is also the Emanage Ultimate, which when fully functional can do a lot more than an SAFC/VAFC and can control A/F, timing advance and retard and in theory even rev limit.

For SMT-6 info, try 98SEBlackMax or Kevlo911. Those guys have spent a fair amount of time developing it for use on a VQ30 and should be able to help you out with the VQ35 too I'd think..

 

I'll try to contact Kevlo911 and 98SEBlackMax but the forum rules are restricting me against Searching, PM'ing, and starting new threads.......

That's harsh.

 

You can thank all the n00bs that came before you that didn't have a clue for that.

 

I was just about to hit the trigger and order a super afc-II about 5 min ago, but then I remembered a post about someone saying they are running a vafc, and can lower the crossover point in the variable timing to get the cam switchover at a lower rpm. I think I will go ahead and order this, but I am hitting the track this weekend and I really need a wiring diagram to bring to my mechanic so he can wire this thing up for me and tune it for me.

1. I have the ecu wiring diagram for the super afc-II on the vq35, but I dont have the vafc one, can someone help me with this?

2. What are some of the setting you guys have(vafc; vq35 users) because I need a little something to follow by. I have HS headers, custom 2.5" exhaust, injen intake, udp.

Please help me out guys, I really wanna order this thing ASAP so I can recieve it and install and tune before sunday when I hit the track. Your help is really needed. Thanks.

 

Seems as if you are missing the entire point of the VAFC's advanatage over the SAFC ... It has absolutely nothing to do with what you wrote above. ... If you read a little more above, you might get the point ...

 

I know what else it does, I read the whole thread....

 

This wasn't clea in your fisr post .... I was only trying to help.

 

altimas.net is full of morons. they swear by mustang dynos

 

Yes as "they" summarizes every single member over on altimas.net and I definately swear by the mustang dyno!

Genius, you sure you don't post over there on weekends?

Now back on topic....

I'm going to start calling up local places to see if they would take up the project of installing a Greddy eManage Ultimate for my VQ35....will be interesting to say the least.

 

They will still be only to tune a/f.. Not sure of you knew that. But compared to safc/vafc, it will be very very fine tuning
Greddy still needs to work a few bugs out in order to alter timing among other parameters on our VQ's.

 

Are we waiting on a software fix that is downloadable so the user can update it themselves or is it a hardware issue?

 

Actually its neither, the firmware needs to be changed to recognize the VQ30.

 

Well maybe you don't know this but when it comes to tuning, mustang > dynojet because of the more realistic loads you can dial in.

 

I prefer tuning on a Mustang Dyno. It's easier to do and there are more things you can do. I only go to a DynoJet 248c now to produce 'Internet' numbers.

 

Velicos has a VQ35 not a VQ30 if he's got an 04 Altima.

 

So yeah, still trying to figure out if the VQ35 would have any chance of compatibility with advancing / retarding the ignition on the fly. Eh?

 

If you've already got the SMT, talk to the 2 guys I mentioned.. you may be able to use that although it won't extend the rev limiter. Failing that, or if you want to spend more $$ then consider the EU. It works well with the 350Z (rwd) but as far as I know, no one has installed it on a fwd VQ35.

If you can't PM, try sending them an AIM message? Check out 98SEBlackMax's thread on the SMT in this forum to get their AIM links...