More boost equals more power? How?

[Jim Nunn]

I now have 35+- PSI boost using a wastegate turnbuckle and boost module. I didn't have any smoke pouring out the exhaust before (I must have been burning all the fuel with 20 PSI boost). Does this mean that more fuel is definitely getting through my 275 injectors?

Why?

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James L Nunn
2001 Flame Red Quadcab 2500 2wd, Diablo Power Puck, K&N, 4" exhaust, BD 275 injectors, DTT TC & VB, brite lite, Viper Remote start, Turbo life saver timer, Practical Solutions boost module, Wastegate turnbuckled off

 

[EMDDIESEL]

I odnt know if this is the answer to your question, but here goes. The boost idea works like this: To make power in your diesel, you need air and fuel. The more air you can get in the cylinders, the more power you make. A turbocharger forces air into the cylinders (hence the name, "Forced induction"). More air then the suction of the pistons downstroke can create, therefore you are getting more efficient power. A bigger turbo or adjusting the waste gate to give you more boost means even MORE air. Thats where bigger injectors come in. More air needs more fuel to complete the process. That is why an intercooler is so important. Compressing air heats it, hot air is less dense then cool air which means you need more of it. An intercooler cools the air that is heated by the commpression of the Turbo and the heat bleeding over form the turbine side of the Turbocharger. (That is why a supercharger is sometimes more effective is gasoline applications due to the fact that you dont have to deal with the engine exhaust heating your intake air). That is also another reason why the Psychotty system is so good, it draws air from outside the engine compartment. That is also why your truck seems to be more powerful in cold weather.
Nitrous oxide systems used on race cars (And can be used on diesels too) work the same way. First, Nitrous Oxide is an Oxidizer, in other words, it supports combustion, and the other advantage, is it is 176 degrees below zero, so it also cools the incoming air to make it more dense. Another way you can increse the efficency of your engine is insulate the intake piping from the intercooler to the intake manifold. That will help to keep your intake charge cool.

 

[Bob Wagner]

Jim before you added the boost module you were being defueled at 20psi. Now you will keep the fuel flowing over 20psi.

Boost module increase air flow which inturn lowers the exhaust gas temperatures

 

[Diesel Freak]

ok here goes..... more boost does not make more power! the only time more boost makes more power is if you are smoking at the lower boost level and now at the higher boost level there is enough O2 to allow complete combustion of the fuel. If you feel like you have more power it is because of what Bob said... . before the addition of the boost module the ECM was defueling the engine at high boost. N2O (nitrous oxide) only adds horsepower to a diesel engine if there is excess fuel to burn (your engine smokes)
Superchargers are NOT more effective on a gas engine than a turbo at the same boost level. They are just easier to work with and look cooler than a rusty old turbine housing
-Cliff

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2001 ETH-DEE, Diablo Power Puck, Bosch 275's, Practical Solutions Boost Module and Elbow, LFT Silencer Ring Eliminator, K&N, Straight Piped http://www.mudrunner.sites.cc

[This message has been edited by cdaledh (edited 04-27-2001). ]

 

[EMDDIESEL]

I guess is hould have been more specific. Just to clear a few things up. First, more boost DOES equal more power PROVIDED you have MORE fuel.
Second, i was not implying just spraying Nitrous into a diesel engine would give you more power. A proper Nitrous Oxide system WILL give you more power since it injects additional fuel WITH the nitrous at the same time eliminating a lean condition.
And lastly, superchargers are more effective on non diesel engines designed to use them. Trust me on this one, there is a reason why EVERY Top Fuel and NHRA funny car is running a supercharger with over 60PSI of boost and not a Turbo. Maybe i used the word "Efficent" to freely.
The reason why so there so many aftermarket supercharger kits for gassers like Paxton, Vortech, Powerdyne, etc and very few turbo kits is mainly because it is alot easier to bolt in a belt drive blower then it is to install special exhaust manifolds, custom exhaust piping, oil lines, etc. required for a turbo plus an intercooler is almost a neccesity with a Turbo (Buick learned that fast with the 85' GN's). A centrifigul supercharger in a gas engine is easy to install and provides alot less lag compared to a turbo. And in most applications wont need an intercooler and the related piping. Sorry for any confusion.

 

[Diesel Freak]

yes, turbo lag has a detrimental effect on ET but a supercharged engine has more parasitic loss to the blower than a turbocharged engine looses due to back pressure from a correctly built turbo at the same boost level.

 

[HiPerf360]

I takes over 1000hp to turn a supercharger on a Top-Fuel car but when you receive an extra 2500-3000hp from the supercharger becomes a viable option. There was a Top-Fuel car that used turbos, the horsepower was there but the lag was too bad.