mazzuri super headers
#216
From what I understand, to do a true "tune", alter the a/f tables and the timing tables, at differing rpm's you need to go into the computer. You would only alter these variables at full throttle or closed loop settings. In regular driving on open loop the standard settings would be used. If you could open the computer these could be adjusted also. From my experiance watching LSx engines, they all ran rich after a header install, so the computer has to take away more fuel for the proper O2 readings just cruising around.
#217
all you really need to tune air and fuel ratio's is an APEXi Neo and tap into the stock ecu, i know someone one here has one hooked up. that is all you can really do, other then that timing ect can not be changed.
#218
If this header is any good, then I would expect the AFR to be leaner than stock after installing them. I've never heard of a good performance mod causing a rich mixture on an NA setup. I've always believed that a piggyback ECU is generally most beneficial on a stock vehicle, then slightly less beneficial with each good mod after that since the unadjusted mixture gets closer and closer to optimum with each mod.
#220
If this header is any good, then I would expect the AFR to be leaner than stock after installing them. I've never heard of a good performance mod causing a rich mixture on an NA setup. I've always believed that a piggyback ECU is generally most beneficial on a stock vehicle, then slightly less beneficial with each good mod after that since the unadjusted mixture gets closer and closer to optimum with each mod.
On the IS250 the ratio was a bit lean, I think it was mid to low 14:1s on the low end, top end however it was down to 11s.
I think the biggest gains on this car would come from tuning the timing, as it was all over the place on the dyno if you just mashed it.
#221
#222
You can definitely tune the air/fuel because I have a greddy e-manage ultimate piggy-back and i have been able to tune those numbers. I cant wait to get these headers on and see if a retune is going to help.