Quote:
Originally Posted by Tatsu333
OK - I could buy that on a supercharged motor it could be worthwhile. 6-10 hp sounds a bit optimistic, but *maybe*...
For an NA motor, though, I don't think it would see any significant gains - just not moving enough air to need more flow.
Wait - are you saying you felt there was a 6-10 hp gain NA up top with the Extrude Honed 2017+ IM?
Was this vs. your stock 2013 IM, or the gain from doing the Extrude Hone on the 2017+ IM vs. not Extrude Honed?
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What is your experience for concluding there would be a lack of gains?
Note: I ran E85 and a 2mm overbore OEM TB while NA using this IM and adjusted the cam angles for optimization later on.
Best representation:
Red-MY13 IM,
Blue-MY17 ExHn.
I data logged on the same road and conditions several times. The logs indicate more MAF usage (g/s, Vs) as well as running a bit leaner. The pulls also took less time.
I don't imagine you can feel any gain under 5hp. From the research I did on the subject before initiating the project 3-5%hp increase was common on NA motors. No data on FI. Ford used the process on the SVT 2.5 Contour SVT back in the day and it was good for 5-10hp.
2013 IM vs MY17 extrude honed. I never bother bolting the MY17 up before the processing.