S-AFC and Z32 mafs on an 11:1 KA

[Rownan]

Hey everyone, I am currently running an 11:1 compression KA24DE tuned by JWT. Yeah it's quick. I had plans to upgrade my colt stage 2 cams to something bigger, but am now thinking of another path to walk my all motor KA down..

I currently have a 2nd generation Apexi S-AFC on the way, and also will soon have a Z32 mass airflow sensor in my hands. I'm hoping to open up the engine a little more with the bigger mafs and then fine tune it with the S-AFC. I am being told by lots of people that JWT downtunes their ECUs to run conservatively on different setups. For instance my ECU isn't even tuned for my colt cams. i'm also being told that I have the ability to make some great horsepower by simply tuning jim wolf's setup with the S-AFC. The Z32 mafs was my idea hinted at by Asad from Freshalloy. Why not upgrade if the AFC has the ability to program for it you know? Can only gain horsepower.

Also when I do end up going to bigger cams, perhaps I'll be able to tune them with the s-afc instead of sending the ECU back to JWT for retuning!

Okay I guess my question is, does anyone have any experience tuning with an s-afc and a Z32 mafs on an NA setup? I've never done this before but I understand how it all works.. I guess what will happen is the Z32 mafs with read more air because of the bigger size, thereby adding more fuel.. Do I want to the lean that out with the s-afc or continue richening the mixture? I was told that you want to lean it out just to the edge of where you start to get knock. Is this true? How careful will I need to be with this considering I am running a fairly high compression inside the cylinders?

Any help will be appreciated! I think this is good conversation cause I don't believe I've ever heard of anyone doing this on an NA motor, let alone with a high compression engine already tuned by JWT...

I can't wait to see how it turns out. Hoping for over 200 to the wheels afterwards. Gonna get some dyno time.

'95 S14http://www.projectaspec.com

[Aries]

I have tuned this setup before on my 10.1:1 Nitrous KA.

You want to lean it out as far as you can without getting detonation or knock.Becareful though, because the Z32 MAF will richen the mixture considerably, and not paying attention while leaning out the fuel side will cause some serious damage.

[themadscientist]

I wouldn't even attempt it without an Air/Fuel meter. I used that and a SAFC to retune my computer to run 370cc CA18DET injectors on my CA18DE smooth as silk so I know you could remap for the 300ZX AFM but that leaning out to just before detonation is crazy. I had my car sitting at about 14.5:1 A/F at idle and sweeping up to a slightly rich streetable 13:1 target on my low throttle map. On the high throttle map though it arced swifty up to 12.7:1 for high power. Knock is not something you flirt with. You realize that your stock AFM should be able to read your flow fine though. With the 80mm you gain a freer flowing body for your top end, 2hp maybe.

[I am Technoman]

Rownan how much HP do you have now?

[TrunkMonkey]

I wouldn't even attempt it without an Air/Fuel meter.

i agree. a must have. BUT on a built n/a engine it is common practice to run as lean as possible without detonating. that's where you pick up extra ponies.

-demetrius

[Aries]

i agree. a must have. BUT on a built n/a engine it is common practice to run as lean as possible without detonating. that's where you pick up extra ponies.

-demetrius

Yes.My motors are known to run horribly lean.I even run my nitrous motors lean to gain the extra HP (just never on a dry kit)

currently the 240SS runs at 16.2:1 at idle, arcing swiftly to 12.2:1 at 6000.Smoothe curve with no fluctuations in the middle.

I don't recommend any self tuners run this lean, but on a race car it's how you get the best times on the track.

[themadscientist]

with that clarification I would agree. you said the "L" word and alarms went off but I see you richening it up on the top, otay. I can unpucker my butt now, on second thought I'm kind of liking it!

[Aries]

It's all good.I'm not stupid with fuel, I just have a speed fetish when it comes to cars.

[Rownan]

I wouldn't even attempt it without an Air/Fuel meter. I used that and a SAFC to retune my computer to run 370cc CA18DET injectors on my CA18DE smooth as silk so I know you could remap for the 300ZX AFM but that leaning out to just before detonation is crazy. I had my car sitting at about 14.5:1 A/F at idle and sweeping up to a slightly rich streetable 13:1 target on my low throttle map. On the high throttle map though it arced swifty up to 12.7:1 for high power. Knock is not something you flirt with. You realize that your stock AFM should be able to read your flow fine though. With the 80mm you gain a freer flowing body for your top end, 2hp maybe.

Don't worry, I'll be monitoring the mixture VERY closely when I begin tuning.. I'm amassing autometer gauges as we speak.

[Rownan]

Rownan how much HP do you have now?

Car was dynoed previously at about 180 to the wheels, it has had work done since. After the S-AFC I'll be getting some more dyno time for tuning purposes and see what kind of numbers I can pull.

[themadscientist]

180 and it's not optimized yet, pretty nice. You could be looking at a 200hp atmospheric mill.