Should i get a SAFC-II (dyno inside with a/f plot)
#1
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Should i get a SAFC-II (dyno inside with a/f plot)
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)
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)
#2
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.
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.
#4
Originally Posted by SR20DEN
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?
#5
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.
#6
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Originally Posted by Nealoc187
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.
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.
#8
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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
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
#9
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.
#15
Originally Posted by sean05
is an ecu (TS or JWT) TS only removing it on the autos?
#18
Originally Posted by harmbone2k2
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.
#19
Originally Posted by maxmale
i bought my safc II today and am just curious as to how much is a good price to get it hooked up?
http://jime.homeip.net/S-AFCII4thGen.html
#20
Originally Posted by jmeister
#21
Originally Posted by SR20DEN
Neither of which address his car, wiring harness and lack of tach output.
#22
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.
#25
Originally Posted by SR20DEN
Certainly, but the diagrams don't show where you would connect the trigger for a VI.
#28
Originally Posted by MDeezy
I thought the Greddy eManage piggy back was able to raise the rev limiter?
#29
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.
Originally Posted by Greddy Web Site
There are also built-in Boost, Rev and Speed Limiter-Cut features.
I sent them an email asking specifically about our cars.
#32
Originally Posted by harmbone2k2
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 is it better to be a little rich or a little lean.
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