its Version

 

i dont have the breakdown sheet of my AFR's but if you enlarge my dyno sheets you can see the tracking of my afrs along the rpm range.

 

thanks, but MAN its VERY hard to see exactly what a/f you are running because the axis on the right is so broad

the referance lines just go from 12.5 and then jump to 15..

 

justin might, be able to do something with PS to make it more readable, i have no idea how to do that stuff.

 

right click, save as. Open in paint. Zoom in on the range on the right. Seperate into 5 equal columns between 12.5 and 15 by placing a blackdot every 1/5 the distance between 12.5 and 15. @ each dot, draw a horizontal line across the entire drawing. Zoom in on the part you want to look at. Done.

That's how I had to do everyone's dyno sheets, to get them all on the same graph.

 

wow, i would have never thought of that....

 

I did what Nate explained, version at your peak power , you are between 13.8 -14.0 A/Fs.

From 8k- to redline you are over 13.5.

It pretty crazy how much extra power you can make with just Fuel tuning.

You just need a dyno and wideband to dial it all in. Unless you have a scanner or some way to read Ignition timing, how would you know how lean is too lean for the factory ECU's timing?

obviously you would know if you hear pinging or not. And you can still be at a point where the engine dosent ping, but its running at a higher Temp. but there has to be a certain threshold tuners go by, a rule of thumb.

I always thought the rule of thumb was anything over 13.5 is pretty lean. but I guess I heard wrong because your car seems to like 13.8-14.0 at redline.

 

it does. which is scary. my tuner got a lil nuts with the afrs and had it at 14.3:1 and it make 236rwhp, and it wasnt pinging, or nothing but i would never run it there all the time. thats asking for trouble.

 

yea thats what im wondering, at that point, when it isnt pining, and its that lean.....

pull after pull its just going to get hotter, and hotter, and at some point the ECU is going to pull timing.


?? I cant wait to get my VAFC and start messing around on the dyno with it!

 

i would say tune to around 13.8 and you unlock ass loads of top end power. i seen many s2ks run at that afr with no prob. but of course every car is different.