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kpr's kp60


kpr

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Another fail, almost zero change.

 

Thats with 1.5mm oversized inlet valves and 2mm oversized exhaust.

 

Its pulling  2-3kpa  manifold vacuum past 6000rpm.  unsure how much effect on power it has,  but running out of ideas fast.

 

blue line is atmo (bap),  purple is manifold press (map).    the map only has 1kpa resolution and is just plugged into one of the stock vac ports on itbs, hence is bit all over the show. but clearly on downward trend.

 

kp3.png

 

ignore messy afr was too lazy to correct it.

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Done some more testing.  Made some restictor plates between the trumpets and throttle bodies.  After stealing some area calculations off Roman Daves build thread.  The plates work out to be around the same area as a silvertop 43mm throttle body, taking into account the throttle plate.  

 

Interestingly the vacuum numbers haven't changed enough to measure with the lack of resolution.  But the AFR has gone rich  from the point it starts to pull some vac.  Around 5% fuel needs to be removed to get it to match the 45mm throttles.  So maybe only a tiny amount of vac has a big effect.    Either that or the restriction plates are just messing up the flow rather than restricting it.  

It makes mountains of torque at 5500rpm when its running close to atmo pressure, then falls away as it gets a few kpa vac.

 

Pity it aint so easy to make the throttles bigger

 

As usual; pinky baseline run 45mm throttle.

kp-inlet-restictor.png

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