IPD Plenum - best performance mod?

[ike84]

Originally Posted by michaelpetersen3

Nice work Ike. Your idea is similar to how Porsche runs their GT4 Cayman race cars... dual intakes running to the rear window vents.



Only potential downside of your design is the intake temps. Have you read the temps in the trunk during normal operation?



Solid work!

Thanks for the props!

The intake temps are an issue with the rad expansion tank in there. Here's a chart from this morning. Ambient temp was 78deg. These measurements are from the OEM IAT sensor. You can see a pretty quick climb, this was start to finish on a 13 min drive. I should have charted water temps too but they never exceeded 185. More work to be done! Maybe I'll go ahead and install the water air intercoolers now lol.

Another subjective thing I can say about the performance difference is how freely the engine revs now in neutral. My very first reaction after I pushed my tune was shock over the difference there.



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[fabioan]

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[The Radium King]

NECRO thread, but i'll take a shot.

all the info is in the provided dynos, but i do not think they have been interpreted properly.

first of all, there are three passes - stock, exhaust, exhaust+intake. both exhaust and exhaust+intake improve over stock throughout the curve.

exhaust+intake also has higher peak torque and HP over just exhaust (ie at higher rpm) however exhaust looks to have much more midrange over exhaust+intake. they say it's not the peak power that matters but rather total area under the curve. but that depends on how you drive - keep it over 5k rpms and exhaust+intake is outperforming everything else.

further, exhaust was performed with a tune while stock and exhaust+intake were not. this becomes very obvious when looking at the afr curves at the bottom of the dyno - exhaust runs leaner and for longer compared to either stock or exhaust+intake. ie, the tune looks to run an afr of 12.5 vs 12 when the ecu transitions to open loop. apply the same tune to stock and exhaust+intake and i think you will see exhaust loose the midrange advantage. until then it's an apples to oranges comparison.