F56 JCW w/ Racechip GTS

Old 03-05-2019, 11:45 AM
G26okie is offline
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Originally Posted by charrigan View Post
one of the reasons I sold my Racechip. If you turn down the Racechip setting the surge will be less noticeable.

I will say comparing my logs of NM, Dinan sport, and Racechip Ultimate the Racechip had by far the safest AFR of the three. The downside on the MCS with a tuning box only altering boost and not adding fuel is the ecu will continue to target ~14.5:1 AFR which depending on the other mods and ambient temp you are right on the edge of detonation. This is not as big of an issue if installed on a JCW because they run a richer AFR.
I don't think any modern DI turbo engine targets a 14:5 afr at WOT.

Any of them I've seen run pretty rich.
Old 03-06-2019, 06:54 AM
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Originally Posted by G26okie View Post
I don't think any modern DI turbo engine targets a 14:5 afr at WOT.

Any of them I've seen run pretty rich.
Log your car. You will be surprised on how lean newer gen DI engines run.

I went back to my logs and I was slightly off. sub 5k rpm the MCS will target 14.7:1 AFR. Above 5k depending on IAT etc it will typically run 13.8 to 14.3 on my logs.

Another example of a lean running DI turbo is the EA888 gen 3 in the mk7 gti's. They typically run high 14 to low 15:1 AFR under full load until about 6k rpm and it will taper to high 13's.
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