Quote:
Originally Posted by gtfoxy
MAT being what it is, with a cursory review, 1.4G/cyl is hauling the mail vs 1.29 @ similar RPM (actually less).
Not being familiar with the centri intercooler nomenclature is that still an A2A? If so an an A2L would change those numbers provided the IC block & cooling circuit was adequate.
Then again there’s always the killer chiller for the PD.
Add: I never really paid attention to the compressor efficiency of a centri vs a PD as I understand a linear rate centri compressor map highly relies on not only pressure ratio, but also engine RPM (translated to compressor RPM), while at the same time a PD does as well, but a PD holds an tangible advantage as fluid density increases.
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Yes the P1x has the stage 2 A2A intercooler upgrade. I believe we will see a pretty good jump in G/cyl when we put a flex sensor on it and run some timing. This is why I wouldn't boost a stock compression LT1 on 93...you can't run any timing in them. I am seeing 7 degrees more timing advance on E52. Honestly I have never seen real knock on my setup running E. I have had the timing up to 21 degrees on E50 and still no knock but stopped there. I bumped it back to 19 just to keep it safe.
The P1x definitely builds boost with RPM but the Whipple also has a linear rising boost curve just not as dramatic. The P1x is around 5psi @ 4500rpm and ends up at 9.5psi @ 6600 rpm. The Whipple is around 7psi and ends up around 9.5psi. I believe all that means is the Whipple is not being spun hard.
From what I see The P1 kits coming from Procharger are already being driven near peak efficiency, where the Whipple/Magnuson stuff has a lot of room to grow. Now that does not mean the P1x won't go further. I believe Dan Hacker has taken one to 800whp and mid 9 second passes with Meth and E...but the Meth is improving efficiency dramatically on the P1x.
I would love to see some logs of a D1x or Paxton 1500/2200. There was a post of FB lastnight about P1 stuff that stirred some debate and exactly why I wanted to start this thread to show some actual real world data.