I have been pondering on purchasing a SAFC II for sometime now but i have been hesitant because i am not sure that this would result in any increase in power. I was wondering if any of the guys in here who have used the SAFC II on their own cars think it would be benificial for me to purchase one. Currently i am at 176whp i would like to get to 200whp so i am thinking maybe cattman headers and SAFC tuning may pick up some power.i know 24whp is a long way to go but i would like to take a shot at it.
Car has had tune up with ned knock sensor,NGK plat plugs and fuel filter as well as coolant flush.

1999 Nissan Maxima SE-L
5speed and California Emissions
Warpspeed y pipe
B&M short Throw Shifter (added after dyno)
Sun Automobile Hyperground System
Greddy SP Catback
Catco Highflow Catalitic Converter
Mobil 1 5W30 Synthetic oil
Redline MT90 Gear Oil (added after Dyno)

 

Good torque number, but your hp seems about 10 hp less than where you ought to be. I made 190 tq/185 hp with the same mods as you, except for a test pipe and I had an HKS exhaust with Stillen b-pipe. Oh, and I had a prcai. I wouldn't think that would mean a 10 hp difference, though.

I wonder why your afr gets below 12? That seems awfully low for a Max with an unmodified fuel system. Mine was in the low 13's.

Anyway, I was going to suggest that the SAFC could help you out by raising your afr up out of the 11's, but that is where you're making all that good torque. From what I've read, though, mid 12's to mid 13's is optimal for NA performance, so maybe you could gain by leaning out a bit at higher rpm.

 

Yes you should get the SAFC-II or even a SMT6. If you plan to install a MEVI or VI you should get the VAFC-II.

 

what is the SMT6 and what are some benefits of it? got a website for it?

 

Get a JWT ECU then you benefit from the advanced timing and leaner mixture. SAFC would help, JWT ECU would help more. For a 99 you have to change a few things with your ECU harness, but you would have to do so anyways if you got SAFC.

 

Well i would love to Get a JWT ECU, 7200rpm rev limit would make it worth it because i would be able to get the MEVI. But the idea of have to move stuff around on my Wiring harness is not an option and i have called them in the past and they said that it can be done but i don't know of anyone who has actually done this and i con't wanna take the chance on it and f something up. i am thinking i may just get the SAFC II and 2000-2001 intake manifold.
my main concern is would it be worth for me to get an SAFC based on my A/F ratios, which apparently is a good idea from what i have heard. i don't know why my HP is so low, my car is a CALIFORNIA emissions car so i am guessing that has something to do with it. the TQ is pretty good i just want some more HP i would like to squeez an additional 10whp out of it if i can with the SAFC, doesn't have to be peak power but 10WHP anywhere.

i looked up the SMT6 that would suggested and it looks great but i have no idea how to tune and i don't know if any of the Shops here in MA would know how to either. i do have a DYNO shop that can tune with the SAFC.
this is the info i found on the SMT6 if you wanted to add anything SR20DEN i would appreciate it.
http://www.perfectpower.com/products/smt6.asp

Any more suggestions and tips would be greatly appreciated. i figued this would be a good thread to add to a sticky somewhere since my mods are common among most people and if anyone else was looking into A/F tuning via SAFC II.

this is the pin out i found for installing a SAFC II on a 4th gen. its for a 1997 can anyone confirm if these pins are the same for a 1999. i don't have FSM and don't know where to look.

 

so which is good to get for the mevi safc2 or vafc2

 

i downloaded my dyno files and extracted the exact A/F ratio with regard to RPM here is what i have. i also have this file in Excel format if anyone would care to look it over and tell me what you think from your experiences with SAFC's. from the look of the data it stays pretty rich after 3500RPM. Ayone think i can pick up 5-10whp. i need that much for this to be worth it


Time(s) RPM x1000 hp ft-lbs Air/Fuel
0.22 2.90 N/A N/A 14.56
0.75 3.00 95.24 166.73 13.64
1.19 3.10 99.49 168.55 13.48
1.62 3.20 105.31 172.84 13.47
2.04 3.30 112.04 178.31 13.32
2.45 3.40 118.56 183.14 13.15
2.85 3.50 121.91 182.93 12.82
3.25 3.60 123.51 180.19 12.37
3.66 3.70 129.73 184.15 12.26
4.06 3.80 133.22 184.12 12.10
4.47 3.90 137.86 185.65 12.07
4.88 4.00 138.53 181.90 11.97
5.29 4.10 143.12 183.34 11.89
5.69 4.20 146.22 182.85 11.81
6.11 4.30 151.66 185.24 11.76
6.50 4.40 156.69 187.04 11.63
6.90 4.50 162.51 189.67 11.70
7.31 4.60 163.33 186.49 11.62
7.72 4.70 167.96 187.69 11.72
8.12 4.80 170.96 187.06 11.77
8.53 4.90 173.92 186.42 11.82
8.94 5.00 173.37 182.11 11.87
9.38 5.10 172.95 178.11 11.95
9.81 5.20 173.71 175.45 11.98
10.25 5.30 173.53 171.96 12.05
10.71 5.40 174.88 170.09 12.10
11.18 5.50 175.41 167.51 12.15
11.65 5.60 173.70 162.91 12.22
12.14 5.70 172.31 158.77 12.11
12.65 5.80 171.14 154.97 12.06
13.17 5.90 167.70 149.28 12.14
13.73 6.00 162.60 142.33 12.25
14.31 6.10 156.15 134.44 12.18
14.94 6.20 149.98 127.05 12.10

 

00-01 intake manifold should bring ya up big time. I dunno why but most GXE 5spds put down around 195-199WHP STOCK. Dont waste your time on a MEVI. I will have one for sale sometime soon. Doing something to a spare intake to gain more power.

 

is the SMT6 able to remove the rev limiter?

 

It think it might be in the works.

 

but as of right now it cant?

 

Not yet........

 

thanks. So the only this that can remove the limiter is an ecu (TS or JWT) TS only removing it on the autos?

 

That's what it seems but it has to be linked to something besides the ECU being from an auto.

 

alright guys this might be slightly off topic, sorry. but i didnt want to post a whole thread for one question. i bought my safc II today and am just curious as to how much is a good price to get it hooked up?

 

The S-AFCII alone gave me 14whp/8wtq...you should be able to get the 24hp you are looking for with the Cattman Headers and the S-AFCII.

 

And a few other things.

 

0$

http://jime.homeip.net/S-AFCII4thGen.html

 

Neither of which address his car, wiring harness and lack of tach output.

 

Is the tach output a huge problem? I know a guy who can install it but Im not sure if hes aware of this. I assume if he knows how to install one, he will know how to get around that problem. No?

 

It isn't a big problem, it just requires a little different setup. I would set the SAFC2 to a 1 cyl engine and tap the signal from the #1 primary coil wire at the ECU. I may start doing this on future A33Bs because the SAFC2 has some issues displaying signal somtimes on these cars.

 

will that diagram work with the VAFC also? maybe i dont even need the VAFC. Ill just get the SAFC becuase its cheaper and im using a summit switch for the MEVI

 

Certainly, but the diagrams don't show where you would connect the trigger for a VI.

 

after sitting here thinkin about it i just realized that. I think im gonna so with the SAFC anyways. Thanks sr20

 

Ah, didn't realize it was an '04.
The VI trigger connects to the VTEC output signal on the VAFC, but if you already have the RPM switch...

 

I thought the Greddy eManage piggy back was able to raise the rev limiter?

 

the ultimate is suppose to be able to raise it but im not sure if it works with the VQ30DE. I know is compatiable with VQ35DE

 

I'll try and find out, I would hope so would rather not go the JWT for their "tuning" and raised rev limiter.


there web site says it can.
I sent them an email asking specifically about our cars.

 

Some reason no one has tried it on the 350z

That would have been the first thing I would have tested when I got the EU.

 

I got an e-mail back from greddy and they just copied the description they have on their web site and stuck it in an e-mail and sent it to me. What a great answer.

 

i just got mine installed today and was wondering what you set yours at.

and is it better to be a little rich or a little lean.

 

i am getting it tuned and dynoed today and was just wondering what i should start at as like a baseline.

 

First do a base line dyno and see what the AF is that. Then add fuel/take away fuel to make the AF line FLAT as possible. I would keep it at 13.0 or 13.5

 

Like Kevlo said, 13.5 is ideal for these cars. That is where mine is at after tuning with the S-AFCII and it runs great.