CBRF3
Full Access Member
6.9 with the turbo's and decompressed the way you have 15psi should be good out of experience I have pushed 20psi on NA rods decompressed similar to what you will have with most of mods you got and never had a issue headgaskets popped not the rods and that was because i got greedy and tried to push more 15psi is redline out of experience on 6.9 unless you stud them and that is with being carefull on transition on throttle and such. I will say though 10psi should be much easier to deal with I think your going to struggle to keep it under 10psi so be carefull as your turbo's when they light off theyre going to come on hard and fast aka be a bit violent. They will have a delay delay here we go and the boost will spike quickly likely faster than wastegate can react so be carefull the reason is the way our old IDI's EGT spikes rapidly as soon as you get over a certain amount of dynamic compression ( as RPM's increase dynamic compression pressures jump up ) and the increased fueling causes the EGT's to spike quick making a massive drive pressure on turbos quickly hince the violent spike and once waste gate opens your taking air away from the mix making EGT's spike even further making for a weird double whammy effect on the turbo drive pressures its weird but you will recognize it and feel it and see it via turbo boost pressures / EGT's its just the weird nature of the beast for our IDI's they get a weird delay / spike in EGT's and dynamic compression pressures.Nice, v-band would be better than what I have on my fe and not going n/a on this engine.
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Will keep that in mind and the wastgates will be run will the 10lb springs, I dont trust running the 20lb spings on the n/a rods.
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