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#17
10-19-2007, 06:02 AM
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Re: TBI Throttle Position V.S. Power Output
Much better than the static adjustment of the JET unit.
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CD 1991 W41 #142 1989 Caprice 9C1 1997 C1500 1997 Bonnie SE 1998 Olds 98 LS Recently updated: http://forums.b-body.org 
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#18
10-19-2007, 01:02 PM
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Re: TBI Throttle Position V.S. Power Output
So wait a minute, let me get this straight... you put that TBI in place of an E4ME carburetor? How did the computer control the injectors?
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#19
10-19-2007, 04:20 PM
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Re: TBI Throttle Position V.S. Power Output
Greygoose006, it is a limiter in a way. Your stock fuel pump for a TBI motor is putting out about 20 psi maybe a little more. Your stock fuel pressure regulator in the TBI unit is non adjustable and keeps it anywhere from 8 to 10 psi on average. The aftermarket adjustable units allow you to adjust the output. The motor responds a lot better with 12 to 14 psi. I can't speak from personal experience since I have not done this mod yet, but Hotrod magazine had an article on this using a TBI 350 in a truck.
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#20
10-19-2007, 05:59 PM
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Re: TBI Throttle Position V.S. Power Output
Noooooo Nooooo Noooo.... The 89 was already TBI. I just modified it.
__________________
CD 1991 W41 #142 1989 Caprice 9C1 1997 C1500 1997 Bonnie SE 1998 Olds 98 LS Recently updated: http://forums.b-body.org
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#21
10-20-2007, 11:57 PM
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Re: TBI Throttle Position V.S. Power Output
Ohhh, Okay I kinda figured. Did it make any difference in how the engine performed? I could nab a junkyard TBI and experiment with it, but I don't want to waste my time if it doesn't make a difference.
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#22
10-21-2007, 11:20 AM
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Re: TBI Throttle Position V.S. Power Output
With all of the TBI mods done it was much free revving. It pulls harder clear through to the shift points. It used to fall on its face up close to the shift points at WOT.
A replacement fuel pump will help quite a bit. I used a pump for 94-96 LT1 power b-body to be able to get the pressure up and keep it there. It was too much strain on a TBI pump. I did have to adjust the pressure down quite a bit though!!
__________________
CD 1991 W41 #142 1989 Caprice 9C1 1997 C1500 1997 Bonnie SE 1998 Olds 98 LS Recently updated: http://forums.b-body.org
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