Originally Posted by johnbloem1974
YES!! That's hilarious!
29PSI? WOW. How high can you go before damage is done?
Was that using the Orion?
yes thats the orion.. I didnt have it set at the highest.. I forgot that I had left my EFRC set at 2161 instead of going to the mild power tune of 2141.
I did set an ICP code but was right before my chicago trip so I havent had a chance to see whether my HPOP petered out (needs to be bigger) or if my IPR just didnt react quick enough..
the ford guys frequently make 40 PSI of boost on tuners using the stock turbo..
back to the 466E HT, navistar built these engines to fuel HEAVY in the low end.. essentially I call it a controlled mini-lug .. the fuel curver sends lots of fuel in the low RPM range to gain torque levels.. they use a turbo which tends to spool up quicker in the lower end but doesnt have a ton of high end boost.. getting more air in the cylinders at low RPM allows you to burn more fuel.. its hell on the pistons (thus why they use heavier duty pistons in the HT versions)..
in the turbo world, smaller turbo spools up quicker but wont provide much high end boost. bigger turbo spools slower but needs more RPM to get going and will push higher boost levels at the higher RPMs.. for torque you are operating i nthe lower RPM ranges, thus getting air in the holes quicker is important..
the newer engines went to VGT or Variable geometry turbos which can spool up quick in the low RPM range and then the vanes change to push more boost in the higher RPM range.. the VT365 / 6.0 and I beleive CAT C7 were some of the first to get those.. IH put them in the DT's starting in 04.