Boost and Colder Temps Outside

All boost related things here. Turbos, SuperChargers, FMUs, Megasquirt, et al.
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ten2doyle102
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Re: Boost and Colder Temps Outside

Postby ten2doyle102 » Fri Dec 17, 2010 7:37 pm

I never knew those trucks were running that high of psi....is that normal? 45psi is an awful lot from the sound of it.. LOL!

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Re: Boost and Colder Temps Outside

Postby M20_fever » Fri Dec 17, 2010 8:08 pm

Yeah diesels run pretty high boost, my truck has a mild tuner on it and it peaks at 30psi. My engine could easily handle 50-60psi with the right tune, maybe more. The tuner I run doesn't add fuel, it depends on the stock ECU to do that which is why the boost is limited to 30psi.
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Re: Boost and Colder Temps Outside

Postby ten2doyle102 » Fri Dec 17, 2010 8:29 pm

Is there a reason why they have to run that high boost. I know diesels have to run really high compression ratios too... is that part of it? Sorry, I just don't know much about diesel.
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Re: Boost and Colder Temps Outside

Postby M20_fever » Sat Dec 18, 2010 12:24 am

Yeah, since a diesel depends on combustion caused by compression instead of a spark the CR needs to be much higher than a gas engine, which is also why they can handle much higher boost ratios than gas engines. The added boost with high compression actually helps the diesel make power since detonation is the goal in a diesel.

All that combined with the fact my diesel is 7.3L makes 30psi not all that big of a deal. Eventually I want to upgrade my tuner to one that controls fuel as well, like a DP Tuner, then I can run upwards of 60psi which should make somewhere in the 500hp/750lbft. :twisted: The best part about my diesel is it's 100% forged from the factory, way over engineered for the stock power output.
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