Quote:
Originally Posted by Charcoal_02
Back to the comprssion issue... I'm not sure if compression is limiting boost on the IDI or the turbo is limiting boost. I think 12lbs. is about all I ever got out of the Bank's turbo
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It's both the turbo and compression. Banks and ATS and Hypermax all have their turbo kits for these things set to run right around 12 psi. When you turbo an NA motor, you esentially double compression. So you take these motors the are making 21:1 compression the turbo them, your past 40:1. There for if you can lower the compression enough you can safely run 20+ psi. Just a a comparison, a 7.3 PSD is somewhere around 17:1 compression I believe. That's why stock those turbos put out around 20 PSI. If this is wrong, sombody correct me 
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1989 F-250 4X4 C-6 7.3 IDI, 4.10 SRW, Cobra 148GTL, 4ft bed mounted whips, 12" Powerbass sub, 600W Powerbass amp, Sony Headunit, GPC override(thanks M.L.S.C), Factory Ford aluminum rims from OBS PSD, 4" exhaust, no soupbowl, B&M shift kit
1997 F-350 4X4 E4OD 7.3 Powerstroke, 3.55 SRW. 3"DP to 4" exhaust, TS performance 6pos. chip, Quadzilla Recon XGT, DIY Tymar style intake, Atwood fiberglass cap
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