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Old 02-10-2011, 10:02 AM
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max stock psi on a obs

alright so im new to the diesel world and this site. so i have a 97 quadcab dually and i downpiped it and put a pyro,boost,and trans temp gauges in it. i have a ts 6pos that im going to install but right now im only hit 15psi for boost im tee'd into the map sensor line but i was just wondering if thats the max amount of boost it will push for being stock? and how much more boost will i be pushing at the the different settings of my chip 50,70,100, and 140? thanks for your help guys
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Old 02-10-2011, 10:23 AM
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yea sounds just right for stock, actually it sounds pretty good for stock!

Id think you might hit 25 with the chip on its highest setting, stock OBS trucks have tiny injectors and really limit you a lot
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Old 02-10-2011, 01:40 PM
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I have a 97 Ford F-250 Extended Cab 4x4. I have the edge CS And my boost isn't very high at all. Cruising at about 60 mph I only see 3 lbs of boost. Gets up to like 8 when I'm towing.
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Old 02-10-2011, 01:44 PM
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That sounds about right stock. With custom tunes our old OBS would hit 27-28. But nobody around here knows how it did that. I'd say mid 20's max with great tunes.
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Old 02-10-2011, 01:55 PM
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So with just the programmer it will be lower than if I had a chip in it?
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Old 02-10-2011, 01:57 PM
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Maybe, depending on what the chip is. If its just plain TS tunes they'd probably be close. If you had custom tunes most likely it will be higher since custom tunes will get the most of your motor.
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Old 02-10-2011, 04:24 PM
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My truck has stock injectors, and I could hit 27psi without turning on the propane. With the propane I hit 31psi.
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Old 02-10-2011, 05:03 PM
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Quote:
Originally Posted by IMQDZLA View Post
My truck has stock injectors, and I could hit 27psi without turning on the propane. With the propane I hit 31psi.
I would also bet a paycheck that you have a cali model truck which has bigger injectors in it from the factory. Sorry, you dont count
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Old 02-10-2011, 05:09 PM
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Quote:
Originally Posted by IMQDZLA View Post
My truck has stock injectors, and I could hit 27psi without turning on the propane. With the propane I hit 31psi.
I dont remember what my truck was like back when it was stock, but 27 seems ridiculous on stock injectors.

Youve either got AD's or it doesnt REALLY have stock injectors
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Old 02-10-2011, 06:34 PM
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^^^ Both of you are wrong. Our late 97, which we bought brand spanking new in 97, would hit 27-28psi max with custom tunes. It was a non-cali truck, with stock injectors. Nobody knows how, but it did.

We also had another odd-ball, our 08 F-450. It would roast all 4 rear tires no problem, with a 11ft utility bed full of tools and materials. It weighed in at 14 or 15k lbs. It'd also smoke as much as our tuned 7.3, and got amazing gas mileage for a big heavy truck that was always towing with 4.10's. And it was bone stock.
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