Installed K&N SRI with heat shield enclosure

[hyperpm]

K&N result above was actually the 3rd run today. 1st run posted 252whp and 277wtq. 2nd run heat soaked and numbers were way down. Gave it a break then results of 3rd run posted above. Not sure if ECU, operator, or intake intake itself caused that small dip but I don't think that loss is 100lbs unless you're comparing Cobb to K&N graph. If so then yes since peak is at different points of powerband. One thing for sure is peak torque is higher in powerband for K&N than Cobb. K&N peak torque at 4400rpm is actually close to where stock(green graph) peaks as well.

 

[Darth Vader]

I appreciate this tuned-length velocity stack principle on normally aspirated engines. Does it make any difference on a forced induction engine with direct fuel injection? I would think that the passage from MAF through compressor side of turbo, compression (boost) and heat changes, then the long intercooler pathway before actually getting the cooled down pressurzed charge to the cylinder head might negate any effect. It seems to me (perhaps mistaken) is that all the engine is going to care about regarding the non-pressurized side of the intake system is an accurate MAF sensor reading and the cfm flow going into the compressor side of the turbo.

To paraphrase for anyone listening, yeah, it really does make a difference and adds high-velocity flow (due to the little pinwheel on the engine end) to the challenge for s**** and giggles.

In terms of peak dyno numbers, it might move them around a bit but, the primary difference the driver might feel is driveability and low speed changes. It's still a tube with a filter on the end but, the longer the tube, the flow character of the bends, etc. can have large effects. I've used the trombone example before: the cfm of the pipe isn't altered but the sound most definitely is. Many factors play into these effects and it is an incredibly complex task to break down the results. CFM is a bit player here, though still important to the plot. Also very important is the flow character, the resonant frequencies of the tube and the "plenum" volume of the column of air available for ingestion.

 

[ohioan]

Very helpful thread. Now I just need to find 270 greenbacks laying around somewhere...