Does boost fall off in the upper RPM range? I can hit almost 9 psi and then it tapers off to 6-7 psi by redline at 6300-6400rpm. I have a 2.9 pulley. The crank is pinned and I have a new gatorback on. Doesnt seem to be any belt dust.

Is the blower running out of steam? Is this normal?

Look at the bottom of my dyno sheet. It looks like if I can hold the boost, power will continue to climb but falls off as boost does.

 

I hold 8.5# through 6400 with a 2.8 and a 216/222 115 cam in 90* ambient spraying 50/50 meth/H2O. This is on a LQ9. Since the cold weather, she holds a pound more @ 9-9.5 all the way through 6k.

And yes I think the Maggie is out of steam at those RPM's.

 

even without meth, i am about the same. cam here is 224/228-114

 

If you guys are holding boost.. then maybe there is something wrong with my set up... Where is the boost going??? lol

My cam has a 118.5 lsa, so there should not be any boost bleeding off.

 

time for the 122. lol

 

Mine does the same thing Jason. My boost peaks around 4000 and then drops a a little after 5000 or so? Remember, boost is a measure of resistance, right?

I have a graph somewhere from a previous run.

 

Here is one from a while back

 

you know looking at my scans, mine does start go away, but not huge though. Bill it looks like yours loses about a 1/2 a #. j's is saying he goes from 9 to 6-7. That seems a bit extreme.

 

That graph is old, I'm peaking at 9.5lbs now. I dont recall how much it drops, maybe only a pond. I asked Rick to shoot me the new graph when he gets a second.

 

Im not a Radish owner but its always seemed the blower runs out of huff at 480-500 rwp, not that its anything to sneeze at. If you want more Id go with a procharger or w2w