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kpr's starlet


ratt

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7 minutes ago, Truenotch said:

Oh wow! Which BMW engine are they from? 

most performance...the ones on my falcon.motor are from the m3 s54 motor but they came on the v8 and v10. can buy them all second hand... and the v8 ones are 2 separate banks...of 4 lol.have Thayer own TPS Thayer own injectors and rail and the IAC system.

20181223_091018.thumb.jpg.394c6382fd2bff3bdc7614006fcbf17d.jpg

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As you cut it shorter, did you start to see a peak move around as you got closer to your normal intake? 

I guess curves facing up are the worst, because all of the flow gets biased towards the short side radius of your port so it has to do even more of a change of direction to get into the cylinder.

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measurements are the orange pipe length, not total runner.      can see the peak move up in rpm range as cut pipe down.  afr  was no where near perfect in any of the runs but close enough not to have a massive effect on power.   

Untitled.png.9bab0e36509e7c35eed388a965bbd86f.png

 

Red:  200mm run  from above chart , 
blue: removed the black bellmouth part,  making runner about 80mm shorter over the 200mm one
green: with only the silicone 45   deg joiner
pink:  ali pipe from my normal intake minus the  78mm trumpets/bellmouths.
 

forgot rpm scale in this one..
 

Untitle.png.1f7c2894ead1aeaefe34f2a7a6e67e67.png

 

Blue : ali pipe only as above
Green:  throttle bodies only
red:   normal setup
 

Untit.png.8a88bc3f67e5cf72437ee77009d1ff06.png

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Bouns  graph:    
the shopped line is done years ago when had stock cams in the car.    was done on same brand dyno,  but in 3rd gear not 4th,  which would have shown maybe another 5kw.  
still,  it shows with right setup  don't have  lose low down power with big cams.  

 

969247171_kp151kwvs90kw.jpg.985e65b91a6205d531ae6a94842b77e4.jpg

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