Join Date: Nov 2011
Location: West By God Virginia
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My bad, I was confused on your numbers and I didn't realize you were running a Spartan....as such, you EBP numbers do sound correct based on your boost, EBP, and throttle position. I definitely understand how hard it is to get videos. 6.4s have the potential to have an exhaust brake although almost no one ever runs it. The way 6.4s can have an exhaust brake (I made one for mine using MCC) is by adjusting the vanes on the VGT at "0" throttle, but unless Spartan recently released a program for an exhaust brake, I wasn't aware of anyone making one as a canned tune because of the potential strain it puts on the valve train, up pipes, and turbos. Plus, it is not really loud (at least on my truck). I did post some videos of it on YouTube a while back and you can hear it, but is almost something you have to listen for.
Just so that I am completely clear on what you are saying, this noise is only heard when you let off the throttle (and are declerating), right? If so, have you monitored your EBPs when you let off the throttle? Since you said your truck doesn't feel like it is being held back, I doubt your EBPs are rising (as in an exhaust brake), just making sure you rule that out.
Although it sounds like all of your numbers are normal, it is weird that you only developed this sound recently and that it is so loud. Based on what you have said, it sounds like you are positive there are no signs of an exhaust leak at the tube and no cracks in the up pipes. A very rare place to get a boost leak is between the turbos but I have only read a few of them ever being there and drivers said it was more of a high pitch sound they heard when they were accelerating.
Finally, you might try sending a PM to Jeff Dodd. He works for Spartan and is very knowledgeable and helpful. He goes by 08stroker250.
2008 F350 ZF6 daily driver
No Limits CAI and every air mod, MM w/ GH, DPF/CAT delete 5", Sean's 4" DP, SB DD 3850, Coolant Filter, Bushwacker flares, 2.5" Icon level, SD inserts tailgate/grill, PMF Tbars w/ 5" block, Elite EGR delete, Junior High Power Atmo, ARP studs, A-1000 (Marty's), Fuel Bowl Delete, 15% nozzles, Tial WG
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