jetblack

Got my car on a rolling road last weekend. Made reasonable power- 169.5bhp on a dyno dynamic roller (which i gather read a touch low)

Was hoping for a touch more. Got a print out of the AFR and it looks a little, er, lumpy to me!

Spec is

120,000 mile b16a2 block
Fujitsubo B18 manifold (4-2-1)
Sports cat
Tanabe 60mm Hyper Medallion exhaust
Mugen airbox
Ignition timing at 18 deg BTDC
Cam timing advanced 2 deg at inlet and retarded 2 deg on exhaust using skunk2 cam gears (might be other way around-!?)
Stock 99 si ecu

Can anyone advise on whether this would benefit from some mapping?

Can anyone talk me through what the graph is telling me?
AFR






HP and Torque

jdm602

nice. looks like the range is 12.4-12.8. which isnt that bad. pretty conservative. you could lean it out quite a bit more to make up for lost power. **** my b16 on 12 lbs im seeing close to 12.4 afr's on a cold night. ive even seen 12.6-12.7.

q16racer

read the plugs and they will tell you what to do.
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jetblack

The plugs are all fine but the afr varies across the load/rev range. Surely its about making the AFR right at as many load sites as possible..? No?

boosted k20

mapping will def show improvments. u can lean the a/f a bit and it will gain u some HP