burkgonzo
15+ Year Contributor
- 1,008
- 16
- Oct 27, 2005
-
Wichita Falls,
Texas
Currently I'm running an extrude honed stocker and what point would I gain switching over to a Magnus or some other SMIM?
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With a forrester intake, comp 272’s, and a 3076 in a .63 housing my car makes power from before 4500rpms out to 8500.When you dontd care about power under 6000, and need peak power at 10k.
I did a ton of testing 2 years ago and found a small exhaust housing, smallish cams, and short runner intake to give me the best powerband. It knocked 100hp off my peak hp at the same boost, but brought power on 1,000’s of rpms sooner in the lower gears. I ended up holding power flat from 7,000-9,000+ rpms, with peak boost at 5,200 rpms in 3rd.I did some extensive dyno testing on this, and even on a 64mm turbo the short runner intakes are not the choice for me. Im trying to get my car to leave off a 5k 2step, shift 1-2 at 9500, and still be in the power. at 5k an evo3 intake on a 6 bolt head is worth over 75hp compared to a short runner intake, and it doesn't fall off. Stock is worth more, but does fall off more after 7k.
Anyway my thoughts are a 64mm and tx272s are notn enough to use a short runner smim.