safe speed or RPM for shifting - Page 3 - Ford Powerstroke Diesel Forum
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post #21 of 32 Old 08-14-2019, 08:56 AM
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Intercooler also means more air to compress so you are actually losing 1-2 psi on boost.

Tunes affect timing, fuel, shift points, when fuel is added/reduced and all that depends on your mods.

From the factory these had tiny injectors with oversized turbos which is why they are under powered and live forever.
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post #22 of 32 Old 08-14-2019, 11:58 PM
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Originally Posted by timlsalem View Post
QUOTE You have to introduce more fuel in some way or another. Timing and altitude play roles as well.

Now that makes sense to me. All the mod's were done to the intake, exhaust, and cooling air by use of an inner cooler but she has the stock fuel bowl and pump, although rebuilt, but still stock. Is that what the tune is for? Changing how much fuel goes in for combustion and changing timing?
Iím not sure the specific parameters of your tune, but tunes also modify boost.
I like physics and math. More boost=more heat. Itís just the nature of the beast. I will assume Banks already took into account temperature drop, flow rate, material density, volumetric efficiency, etc to design the intercooler. Two things beyond our control are ambient temperature and pressure/power loss, with the latter due to aerodynamic drag as air moves through the fins as well as changing direction moving through the cooler. (1-atmospheric pressure+boost psi/atmospheric pressure+post intercooler boost psi)*100.

I prefer towing on the stock tune, and using the tow/haul. Iím not going to win any races, but Iím confident it provides a safer environment for my 6.0, at least as much as I can control.
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post #23 of 32 Old 08-15-2019, 08:07 AM Thread Starter
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I know I haven't mentioned too much about the boost I am reading while towing, tuned and stock. With tunes in place, the tunes are the Edge Evolution 15000 series specifically for 7.3's from 1994.5-1997, going up the 6%, 12 mile grade I didn't get over 8 and the average was between 3 and 6 on the boost gauge and tranny 190* max @ 45 mph and 2200 rpm with ambient temp 110*. The other day taking it back to dealers, it is a gradual climb, I only hit 3 in boost with just stock setting and ambient at 100*. I hardly see any boost when I'm in tunes except when climbing, towing or not. Not towing with tunes, boost gets maybe 1 once in a while even if I gun it I usually don't see any boost except when towing. I would like to think Banks did all the research needed to build their inner cooler. I've never had one before this diesel so, I really don't know what normal operation would be with one. I don't know what would be the reason behind Ford not putting one in this first model 7.3 F series. I will still test when I go pick my trailer up and see what the numbers are in stock mode. Will update at that time.

Last edited by timlsalem; 08-15-2019 at 08:19 AM.
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post #24 of 32 Old 08-15-2019, 08:25 AM
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You should see at least 12 psi. What gauge are you using
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post #25 of 32 Old 08-15-2019, 10:43 AM
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According to the MAP sensor in my truck and FORScan, I get about 1-1.5 PSI doing 65 on the freeway, flat road, empty truck. Is it possible you have a leaky uppipe? You should have way more boost pulling that trailer up a grade. Also, don't be afraid to take it out of overdrive, these motors, especially with the stock turbo, need revs to make power.

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post #26 of 32 Old 08-15-2019, 12:23 PM Thread Starter
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You should see at least 12 psi. What gauge are you using
I have an EGT, transmission temp. and boost "Glow Shift" gauges.
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post #27 of 32 Old 08-15-2019, 12:31 PM Thread Starter
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According to the MAP sensor in my truck and FORScan, I get about 1-1.5 PSI doing 65 on the freeway, flat road, empty truck. Is it possible you have a leaky uppipe? You should have way more boost pulling that trailer up a grade. Also, don't be afraid to take it out of overdrive, these motors, especially with the stock turbo, need revs to make power.
I have bellowed up pipes. How do I determine if they are leaking? I just returned from freeway test @ 70mph and I had 1 on the boost gauge and intermittent 2 occasionally. When I dropped down to my normal speed of 60 there is no boost showing.
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post #28 of 32 Old 08-15-2019, 01:26 PM Thread Starter
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Here are a few thumbnails of my boost tube and tubing of inner cooler. The clamp on the turbo intake (I think it's the intake) looks kind of funky to me. The rest of the clamps look to be heavy duty. You can just see the tube for my boost to the right.
Attached Thumbnails
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Name:	inner cooler tubes.JPG
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Size:	1.86 MB
ID:	721821   Click image for larger version

Name:	boost tube.JPG
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Size:	2.19 MB
ID:	721823   Click image for larger version

Name:	inlet with boost tube.JPG
Views:	22
Size:	1.81 MB
ID:	721825  
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post #29 of 32 Old 08-16-2019, 11:45 AM
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The third picture, if that's the clamp you're referring to as funky, is normal. It's Ford's version of a v-band that is sealed internally with an o-ring. If you're showing some boost cruising on the freeway, you might be okay, but it might be worthwhile to check for boost leaks. You can purchase or borrow an intake leak tester. It's basically a cap with a pressure fitting that you put on the turbo inlet and pressurize, and check for leaks. Also, if you have bellowed uppipes, you're probably okay, but you can usually tell uppipe leaks if you see soot on the firewall.

I see you mention you have an Edge. I have no experience with one, so I don't know how well the tunes are written, perhaps someone else can chime in. The tune controls how the truck spools and builds boost through fueling quantity, timing, transmission shift points, etc. All of those things affect EGT, and if done poorly, can make a perfectly fine truck run like garbage. I also don't know if their tunes account for the various modifications you've done. I've never pulled 8300lbs up 6%, but I feel like with your modifications and the pedal to the metal, you should be able to do a little better than 40. Could be a combination of poor fueling along with poor shift strategy. These OBS turbos have a high AR (compared to the later SD turbos), which means they tend to have some "turbo lag", meaning they're not moving a lot of air at low RPM. A good tow tune will downshift earlier to keep the turbo "lit" (keeping revs and thus boost up) to keep power up and EGTs down.

Hope that's helpful!
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post #30 of 32 Old 08-17-2019, 07:11 AM
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Steady state driving you won't see any boost except perhaps on the freeway doing 75mph you'd be at 3-5 psi. Towing or heavy acceleration as mentioned on stock tuning you should see 12-15 psi. Tuned you should see more than that.

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