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1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 08-17-2003, 02:27 AM   #1
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Default Low Boost

I have a 3800sc from a 93 SSEI in my fiero , from reading many posts here my boost levels are way low. MAX boost I am only getting 5 sometimes 6psi. some has said I should see upwards of 10psi. Any suggestions on what to check ? Gas milage is around 7-8 mpg, I expected much better than that. Thanks for any help.
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Old 08-17-2003, 10:39 AM   #2
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The boost will vary depending on intake and exhaust restrictions.
You probably have a slightly modified version due to adapting to the fiero.
Very poor mileage. You should be getting twice that but if your foot is always in it, well.
That fiero must really move.
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Old 08-17-2003, 08:30 PM   #3
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I used a Honda CRX Air Intake , leaves the filter right behind a side scoop , so no restrictions there, and my exhaust is about 8" of pipe coming off the manifold into 2 Cherry bomb mufflers going to each side of the car. I dont think they would be very restrictive. I have gotten a few codes from the ecu one was 64 and other one was 60 something cant remember. I know something isnt correct . It doesnt really have the power I would think it should. I have read alot here of people saying they are gettin 9-10lbsbut maybe they are refering to a series 2 than the series 1.
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Old 08-17-2003, 09:31 PM   #4
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The people that are pagging the boost gauge have better pullys, wires, intake, exhaust. The fact that your only running cherry bombs... no backpressure? everything short of a hopped up 350 chev needs back pressure..
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Old 08-17-2003, 11:05 PM   #5
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So maybe nothing wrong with engine , just need better exhaust ? I plan on a differant pulley, wires is Accell and just ordered MSD DIS box friday. Thanks for the help!
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Old 08-17-2003, 11:27 PM   #6
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Make sure you have no vacum leaks and the boost selinoid is not broken. I can get about 9psi on hot days. Past 10 on cold days.
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Old 08-17-2003, 11:49 PM   #7
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Thanks for replys , gives me a place to start.
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Old 08-22-2003, 08:40 PM   #8
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K, Thanks for everyones help but I finally found my problem. I guess the belt must have been slipping????? I out a new belt on it and Im getting 8-9lbs of boost. I never thought a belt would make that big of differance but slipping guess it would. Thanks again for help.
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