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Old 06-01-2008, 06:21 PM
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cummins vs. psd

well i have heard in the past that on a cummins you can do alot of things to the engine for free and get easly 350 hp. for free. can you do any kind of these things you can do to a obs psd. for free?

something like turn up the fuel pump
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Old 06-01-2008, 06:29 PM
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Well does a 95 PSD have an ECM?.
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Old 06-01-2008, 06:34 PM
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ECM? what exactly is that?
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Old 06-01-2008, 06:39 PM
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It's a small computer that operates everything. Older 12v's did not, That is why you could manually turn up boost and fuel supply. I am in no means a 7.3L expert, But if everything is manual, Then yes it will be cheap to produce a little more power. If anything this will be a BUMP for the guy's who know these trucks.
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Old 06-01-2008, 06:41 PM
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Quote:
Originally Posted by BryanH View Post
It's a small computer that operates everything. Older 12v's did not, That is why you could manually turn up boost and fuel supply. I am in no means a 7.3L expert, But if everything is manual, Then yes it will be cheap to produce a little more power. If anything this will be a BUMP for the guy's who know these trucks.

bump!!!
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Old 06-01-2008, 07:05 PM
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Nope, even the OBS Powerstrokes are computer controlled so you cant turn up fuel pump. Only thing i know of thats "free" would be the FPR shim, but that just really smooths out idle and makes sure the engine is getting adequate fuel pressure and as such isn't a "big power" mod.
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Old 06-01-2008, 07:07 PM
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Originally Posted by French_Toast View Post
Nope, even the OBS Powerstrokes are computer controlled so you cant turn up fuel pump. Only thing i know of thats "free" would be the FPR shim, but that just really smooths out idle and makes sure the engine is getting adequate fuel pressure and as such isn't a "big power" mod.
Well here ya go, You found your man.
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Old 06-01-2008, 07:17 PM
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you can only do free mods to the 12valve not the 24v.
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Old 06-01-2008, 08:52 PM
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Even with the 12 valve cummins, you can't hit 350 HP by just "turning up the screws"
Turbine housing, injectors, fuel pin, pump adjustments, exhaust and a high-flow air filter will get the old cummins to around 300 HP. Diesel Power magazine "Project Rustbucket" for reference.

As far as the 7.3, the 10K (or 18K?) resistor mod for the IPR, FPR shim (as previously mentioned,) IDM resistor mod, and DIY air intake. These will make only slight improvements to power output. To really get increased power, you will need a tuner, or chip. If you get a tuner/chip, BUY GAUGES!!! since you will need to monitor EGT and prevent cooking your engine, especially when hauling heavy loads.
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Old 06-01-2008, 09:21 PM
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Quote:
Originally Posted by alberta 7.3 View Post
Even with the 12 valve cummins, you can't hit 350 HP by just "turning up the screws"
Turbine housing, injectors, fuel pin, pump adjustments, exhaust and a high-flow air filter will get the old cummins to around 300 HP. Diesel Power magazine "Project Rustbucket" for reference.

As far as the 7.3, the 10K (or 18K?) resistor mod for the IPR, FPR shim (as previously mentioned,) IDM resistor mod, and DIY air intake. These will make only slight improvements to power output. To really get increased power, you will need a tuner, or chip. If you get a tuner/chip, BUY GAUGES!!! since you will need to monitor EGT and prevent cooking your engine, especially when hauling heavy loads.
I'd have to go back and look at that article but it sounds like it is in reference to a 1st gen Cummins which had the VE pump. The 2nd gen Cummins was still a 12 valve and still machanical but it has a P pump. You can get a lot more with them without spending much money than you can with the VE pump and most likely can get the 350hp or close to it. The fuel plate in itself is quite an improvment and if you know what you are doing you can grind the stock one in such a way that you can get quite a bit more fuel out of the pump.

However as stated the only mods you can really do on the PSDs are the 10K mod which increases the injection control pressure and helps inject more fuel. On the '94-'97 trucks it really doesn't do much. Or the fuel pressure regulator which really doesn't do much. From my experience more fuel pressure makes for a worse idle and many have complained of worse fuel economy from it as well if you shim it up to much.

To really get gains you need more fuel in the way of a programmer. The intake and exhaust mods won't give you any more power either but will help keep your exhaust gas temps down and help the air flow through the engine. Once you get a programmer the bottle neck is the injectors. The 90cc stock injectors just don't flow enough fuel to really make a lot of power but with a chip will be significanly better than stock. The Superdutys have 135cc or 140cc injectors depending on what year. So a chip makes a lot bigger difference and they make stock about what a '94-'97 makes with a chip.
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