twicks69
Supporting Vendor
- 4,196
- 1,642
- Mar 12, 2004
-
Milwaukee,
Wisconsin
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https://www.dsmtuners.com/gallery/files/2/8/7/2/3/dynosheet_29psi_and_48psi.jpg
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Here is the first thread made when it did 835AWHP in 2011-
http://www.dsmtuners.com/forums/dyno-talk/407235-dynoed-74mm-new-best-835awhp-46psi.html
I only did 4 pulls today to check the tune before DSM Shootout. 3 of them were 28psi wastegate spring pressure, the 4th was ~48psi boost and the numbers shown were the last 28psi pull and the only ~48psi boost pull.
Differences from last session were:
*The changeover to a BoostLab 360* bolted-down thrust bearing instead of the stock Borg Warner 270* one.
*Changed primary and secondary fuel injectors to high impedance units; 2200cc primaries, 1000cc secondaries. Same old 4 Walbro 255HP fuel pumps. Still, only had the primary rail and two pumps (1x Walbro 255HP in-tank and 1x Walbro 255HP in-line pump on -6AN feed line).
*Replaced cylinder head as I crushed it last year. I installed the same cams, same 1mm oversize valves, GSC shortie valve guides, same valve springs; similar port work with more time into the runners than before. Dale Morss Machining (BogusSVO on Tuners) did the machinework, portwork and assembly of the cylinder head.
*Machined and installed my new design shouldered dowels to fit into the cylinder head to prevent the head stud washer from crushing the cylinder head under my kind of boost levels.
So, in all, not much changes; a port work change on the fresh head, and mainly a fuel injector change to high impedance.
Here's the graph!!
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