Re: EFI525 dyno data anybody?
 

So the 565-575HP is measured using the HiPerf motor industry standard HP rating (60*F ambient air temperature) and the 538-556HP using the SAE rating system (77*F ambient air temperature) ?

Re: EFI525 dyno data anybody?
 

I can not comment on the specific < 565 -575cshp ratings you noted. However it is true that the same raw dyno HP test results will net a higher hp rating when interpreted per the HiPerf motor industry standard HP rating (60*F ambient air temperature) than when interpreted per the SAE rating system used by the automobile (OEM) manufacturers (77*F ambient air temperature). There is an OSO.COM thread that discusses this in great detail.

Re: EFI525 dyno data anybody?
 

Quoting RMBUILDER:

STD J607
J607 standard 60°F / 0% humidity / barometric pressure of 29.92 in-Hg

SAE J1349
SAE J1349 standard of 77°F (25°C) / 0% humidity / barometric pressure of 29.234 in-Hg (99 KPa).

The J607 rates 4-5% higher than J1349 due to a compensation for motoring friction loss.

Re: EFI525 dyno data anybody?
 

So the 525 makes around 570 hp when compared to the way most of us have stuff dynoed with the lower sae temp rating,that is impressive. I did wonder how it went from the 535-540 most people talk about it making (which is also impressive for what it is) to the higher numbers. Either way,it makes good numbers,too bad its so much money,Smitty

Re: EFI525 dyno data anybody?
 

Even more impressive on 87 octane.

Re: EFI525 dyno data anybody?
 

Those numbers are pretty high. I went back to look at my numbers, we've dyno'd a few of them. My sheet shows 544hp @ 5185, 572 trq @ 4674. SAE trq was 547.6 and SAE HP was 519.9.

Thanks,
Dustin

Re: EFI525 dyno data anybody?
 

Dustin,

Which SAE J spec ?

Thanks,

Bill

Re: EFI525 dyno data anybody?
 

I was dicussing this thread with my engine builder today, and he also has dyno'd some 525's and said what he's seen is around 540hp.

Re: EFI525 dyno data anybody?
 

Is that STD J607 or SAE J1349 rating?

Re: EFI525 dyno data anybody?
 

My appologies to all. I missunderstood what I was told. Per the dyno lab a new HP525EFI will test 540-555cshp per STD J607. After being subjected to a couple of races the engine will loosen up and will generally produce 565 - 575cshp. Again my appologies.