Best low end boost turbo?? - Ford Powerstroke Diesel Forum
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Old 03-27-2012, 07:14 AM
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Best low end boost turbo??

Im looking for a good low end boost turbo, and injectors. I was looking for a turbo map on the D66 but have not been able to find anything. Im looking for about 30 psi at around 1800 rpm or less. With this turbo I will need fuel and timing tuning as well. Suggestions?

The platform is a 96, F-350, 4x4, 5-spd, single cab, single wheel, 4.10:1, 32.5 tire, Adrenaline HPOP, intake and exhaust breathe easy. everything else stock.
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Old 03-27-2012, 07:49 AM
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I could be wrong here but I don't think there is a single charger that will spool 30 lbs at 1800 or less rpm.


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Old 03-27-2012, 08:16 AM
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I'm open to suggestions on compound turbos as well. I see a few kits online but I'm not really a kit kind of guy, I'd rather know what turbos they are running and fab/engineer my own plumbing, and save a few thousand $$.
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Old 03-27-2012, 04:08 PM
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What are your intentions with the truck? Why 30psi at that rpm?
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Old 03-27-2012, 05:03 PM
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Every turbo I know of doesn't even lite until like 1700 rpm. 30 psi at 1800 would be like 60 at the higher rpms. Why do you need so much boost?


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Old 03-27-2012, 05:40 PM
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currently waiting on my gt42 with a 30 lb gate @ 1200 cfm. capable of 60@1200 stable and 100 on the edge. boost off idle
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Old 03-27-2012, 09:16 PM
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I pull heavy loads at slower speeds. Id rather use turbo pressure than engine rpm to make the power I need. Compounds may be in order, i don't need exactly 30 psi @ 1800 rpm. Just using that as an example of what I'm after. Im not a fan of spinning these engines fast. I had a 7.2 Cat engine in a small freightliner that had good boost at low rpm. It was an I6 but it felt like it did the work with less effort. But this may be unattainable with a "V"-8. What do you think?
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Old 03-28-2012, 01:58 AM
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A few problems that you will run into are extremely high cyl pressure at those kind of rpm's. The slower the rpm, the easier to fill the cyl with air. if you create that much boost at that low of rpm's, you will be filling the cyl to an extreme that might get out of control and start detonating. Also, with these higher than designed pressures, you are gonna put alot more stress on the rings. It is the combustion pressures that forces the piston rings outward to seal on the cyl wall. If you introduce extreme pressures, you will get extreme wear. I don't know on the 7.3 diesel in particular, this is just what I know of engines in general.

The other problem is, if you have a turbo that will create that much boost at that rpm, it won't do anything but heat up the air and the egt's at the upper end of the rpm band. So, that area will be out of reach if you do want to use it. You would need a lower ar exhaust housing to create drive pressure sooner in the rpm band, maybe like a .68 or .84. I have no idea how those housing numbers would react on a 7.3. Just throwing numbers out there.

The turbo you are looking for is very non typical for our applications so you might just want to give turbonetics, precision turbo, or garret a call and discuss things with their tech.
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Old 03-28-2012, 04:31 AM
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If you pull at slower speeds, you might even regear the diff.
If you can keep the motor from 2k to 2.2k or so, you'll have plenty of spool up (stock anyway), and still not be running it very high. But just the way the motor is, that's about the sweet spot.
I'm like you, I just like lower RPMs, but it's not practical for power.
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Old 03-28-2012, 09:06 AM
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It sounds like what I need is a C series 8.3L Cummins under the hood. I need more meat to go with my potatoes!
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