Compression Ignition Addict
Join Date: Jun 2008
Location: Silverton, OR
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IDI's run around 21.5:1 Compression ratio. Unless you shaved your pistons, your should be the same (dont know if you have done that or not). Anyways, with 21:1 CR, I would say around 18-maybe 20psi max. Some people push stock CR IDI's to 15psi, I dont, cause I have stock headgaskets and head bolts (bad headgasket design on 6.9's from the factory, and head bolts plain suck, head studs are better). If you want to run a custom turbo, use a stock OBS PSD turbo, or second gen 7.3 psd turbo. It will be custom though, and we require a lot of fabrication and skill.
1985 Ford F-250 with a 6.9 IDI/T-19 4speed 4x4
Paint, Eagle Alloys, Kelly Safari TSR's, ATS turbo, gauges
2004 Jetta TDI 5 speed
2004 2wd Excursion Limited 6.0. Testing how loyal I am to Ford
1997 Passat B4V TDI. 1 of 80 imported in 97. 50 MPG and a factory 25 gallon fuel tank!