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Originally Posted by illumina The redline for the 4.9 liter is 5200 RPM's. As for the amount of boost, I want no more than 6 psi when all is said and done.
Some 4.9 liter engine specs:
200 hp @4100 RPM's,
275 lb/ft @ 3000 RPM's,
Shift points @ 4900 RPM's.
I'll have to dig up the cam profile if it is needed. Let me know.
Basically I would like to add a few hp above the 4100 RPM line, and not let boost come on till about the 2500 RPM line. I'll scan over everything you've supplied and see if I can't do the compressor map myself for my particular turbocharger. But please, feel free to beat me to it...  |
Alright so at 100% VE 4K, you'd be at roughly 28.364 lbs/min or more than enough to spool the turbo. At 85% VE you'd be at 24.109, still enough. At 2,500 rpm and 100% VE you'd be at 17.272 lbs/min.
100% VE:
2500-17.727 3000-21.273 3500-24.818 4000-28.364 4500-31.909 5000-35.455 5500-39.000
at 85%:
2500-15.068 3000-18.082 3500-21.096 4000-24.109 4500-27.123 5000-30.137 5500-33.150 But also keep in mind that this is not m^3/min rather lbs/min. m^3/min at 100% VE with 6psi you'd be at: 2500-10.768 3000-12.922 3500-15.075 4000-17.229 4500-19.383 5000-21.536 5500-23.690
85% VE you'd be at:
2500-9.153 3000-10.984 3500-12.814 4000-14.645 4500-16.475 5000-18.306 5500-20.136
As you can see, on 2 psi, 4 psi, you'd be spooling the turbo by 2,500 K but these numbers don't take compression ratio into account. I also used a temp of 85º which can and will change. It aslo looks as if a 2.0 Pr and around 8-9 M^3/min would be somewhere in the middle of the *island*. It takes roughly 150 cfm to make 100 hp so in order to make say 300 hp you'd need roughly 450 cfm. 9 M^3/min would put you in the 320cfm catagory but this turbo would be capable of 17.5 M^3/min max. Any way you look at it, you've got alot of math to do before you even start welding
lol
What are your HP/Tq goals for this motor/ I think missed that?