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TBI Throttle Body Injection discussion and questions. L03/CFI tech and other performance enhancements.

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Old 09-27-2009, 12:28 AM   #1
555
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305 to 350 problems

I've just done my 305 to 350 conversion, (and a 700r4 to t-5) (90 marow RS). After a ton of headache I got pretty much everything dealt with except now my idle when warmed up is crap. It just will not stay running, I didn't know if my set up: throttle body to trans-dapt spacer to adapter plate to edelbrock performer could be the problem.....? Any advice, I read the thread talking about "tbichips". Thats what I'm running.... problem diagnosed?

thanx

Jay and RIP
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Old 09-27-2009, 09:18 AM   #2
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Car: 89 Camaro RS
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Re: 305 to 350 problems

You changed the computer and the TBI? What kind of 350 do you have, a LO5?
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Old 09-27-2009, 04:29 PM   #3
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Re: 305 to 350 problems

I have the origional 746 computer with the "tbichip". The motor is first gen 350 I beleive, (has the two peice rear main seal"
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Old 09-27-2009, 04:30 PM   #4
555
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Re: 305 to 350 problems

oh, and the tbi is off the origional 305 but has injectors for a truck 350, (84 suburban)
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Old 09-27-2009, 04:56 PM   #5
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Engine: LO3 TBI
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Re: 305 to 350 problems

Quote:
Originally Posted by 555 View Post
I have the origional 746 computer with the "tbichip". The motor is first gen 350 I beleive, (has the two peice rear main seal"
The speed density system of the TBI is calibrated to a LO5 350, not whatever 350 you happen to have. That's why it's not running worth ***. You probably need a tune.
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Old 09-30-2009, 01:04 PM   #6
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Re: 305 to 350 problems

computer tune?
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Old 09-30-2009, 02:22 PM   #7
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Re: 305 to 350 problems

Yes, as in the computer needs to be calibrated to your particular setup.
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Old 09-30-2009, 02:39 PM   #8
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Re: 305 to 350 problems

thanks buddy, I'll giver a shot.
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Old 09-30-2009, 02:39 PM
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