High boost??? - Ford Powerstroke Diesel Forum

6.4L Performance Parts Discussion What has or has not worked for you?

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post #1 of 28 Old 01-17-2013, 07:04 PM Thread Starter
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High boost???

I updated to the h&s 6.4.47 and the truck ran perfect then we had 1 night of -35 Celsius all day the truck ran good then all of a sudden the boost spiked to 40psi under 1/4%throttle and then had no boost for about 3 minutes then turbo kicked back in and now I'm reading high boost numbers before I would drive 60km/h 4th gear converter locked and I would have about 5-6 psi now I'm getting about 25ish almost 30 so I'm a little worried I hope nothing big f***ed up.


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2008 F250 XLT 4X4
H&S Mini Maxx
S&B CAI
5" Turbo Back Diamond Eye Exhaust
Sinister EGR Delete
CCV Mod
Fabtech Dual Steering Stabilizer
6" Pro Comp Lift
37x13.5-20 Toyo Open Country MT
20" Dick Cepek DC-2 Rims
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post #2 of 28 Old 01-17-2013, 07:23 PM
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Its normal. The newer updates make higher boost #s cruising. But its runs cleaner, cooler, and appears to make more power. I think you will be fine.


Last edited by 08twinturbo; 01-17-2013 at 07:53 PM.
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post #3 of 28 Old 01-17-2013, 07:42 PM
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Is there anything more worthwhile on the .47 than the .46 update? I currently use .46 and haven't really noticed high boost numbers under light throttle.

08 F-350 CCSB - H&S Mini Maxx, 5" MBRP straight piped and 3" CAC pipe, Flo-Pro full EGR delete, Spearco IC, AFE STG 2 CAI
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post #4 of 28 Old 01-17-2013, 07:54 PM
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No, its mainly a firmware update. Files and name changes for the tuning. Tuning is the same.

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post #5 of 28 Old 01-18-2013, 12:02 AM Thread Starter
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High boost???

I. C

2008 F250 XLT 4X4
H&S Mini Maxx
S&B CAI
5" Turbo Back Diamond Eye Exhaust
Sinister EGR Delete
CCV Mod
Fabtech Dual Steering Stabilizer
6" Pro Comp Lift
37x13.5-20 Toyo Open Country MT
20" Dick Cepek DC-2 Rims

Last edited by bag711; 01-18-2013 at 12:31 AM.
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post #6 of 28 Old 01-18-2013, 12:05 AM Thread Starter
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High boost???

Nvm the previous post my phone messed up and posted that, but I can't see this thing lasting to long with numbers like that just cruising and it's at 30psi constantly, I hit 40psi without even trying to. It's almost not even driveable too, the throttle is pretty touchy with the boost that high, it's hard to maintain a speed. Also what I find weird is I updated the 6.4.46 just after it came out and then the .47 just a few days ago and why is it that the high boost just started happening yesterday?




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2008 F250 XLT 4X4
H&S Mini Maxx
S&B CAI
5" Turbo Back Diamond Eye Exhaust
Sinister EGR Delete
CCV Mod
Fabtech Dual Steering Stabilizer
6" Pro Comp Lift
37x13.5-20 Toyo Open Country MT
20" Dick Cepek DC-2 Rims

Last edited by bag711; 01-18-2013 at 12:33 AM.
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post #7 of 28 Old 01-18-2013, 03:37 AM
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I done the new update on 5 tuners now and I have not seen any more than 20 psi cruising. Truck cruises at less than 600 egts. Gas milelage seems to be better as well. Make sure you monitor your boost through the mini max because a lot of times the dash gauge will be close but not exact.

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post #8 of 28 Old 01-18-2013, 05:27 AM Thread Starter
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High boost???

I am watching it through the mini maxx but ill take it out for a ride today and see how it does and ill report back here with some info.


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2008 F250 XLT 4X4
H&S Mini Maxx
S&B CAI
5" Turbo Back Diamond Eye Exhaust
Sinister EGR Delete
CCV Mod
Fabtech Dual Steering Stabilizer
6" Pro Comp Lift
37x13.5-20 Toyo Open Country MT
20" Dick Cepek DC-2 Rims
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post #9 of 28 Old 01-18-2013, 06:17 AM
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Maybe do you have a boost leak? Is one of your intercooler boots torn or maybe is loose?

08 F350 cc/sb 4X4
h&s minimaxx, 5" flo pro, 4" down pipe, no limit cold air intake, dirty diesel EGR delete with intake elbow, 6.0 exhaust manifolds, custom up pipes, ported intake manifold, Apex 71mm LP turbo, Rudy's cold side pipe, diesel site coolant and transmission filter, diesel site intercooler boots, ccv mod, bilstein shocks, gogo dd solenoid, HID lights, Airdog II 165, PMF traction bars, PMF drag link, moshimoto aluminum radiator
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post #10 of 28 Old 01-18-2013, 08:25 AM
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I believe clayton had this same issue a few weeks back. This update wasnt available yet, but it was cold for days and he was experiencing high boost numbers. I dont remember what the issue ended up being. 40 psi around town is to much. Thats not going to net good mpg's.

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