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Carburetors Carb discussion and questions. Upgrading a Third Gen carburetor, swapping TBI to carburetor, or TPI to carburetor? Need LG4 or H.O. info? Post it here.

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Old 06-29-2009, 09:36 PM   #1
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TPS voltage vs. Idle speed

On my car, the factory setting for the TPS is supposed to be .41V ( plus or mines .1 ) at 550 rpm. Currently, my car idles better at a sleightly higher rpm than that ( about 750ish ). I have a larger engine in my car, and due to this and that, may never like the idle at the factory 550 rpm.

So should my TPS voltage be set higher than .41 since my idle is higher, or should the TPS always be set to it's idle spec regardless of your actual idle speed?

Currently it's set a little too high at .68V. What difference should I expect to see if I turned it down to stock ( or closer to stock ) setting?
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Last edited by DoubleV; 06-29-2009 at 11:09 PM.
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Old 06-29-2009, 11:29 PM   #2
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Re: TPS voltage vs. Idle speed

When you installed the larger motor did you adjust the IAB with a dwell meter?

Set the TPS at .41 so the computer has correct input. It's output is only as good as it's input. No performance benefit having it high/low, only poor mileage.
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Old 06-30-2009, 02:01 AM   #3
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Re: TPS voltage vs. Idle speed

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When you installed the larger motor did you adjust the IAB with a dwell meter?
Yes, but I think I could do better. I did a 'quicky' job because I didn't have the time. I used a friends laptop that displayed all the info. The reading were jumping around alot ( lazy O2 sensor??? ) so I wasn't able to be as precise as I wanted to be.
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Set the TPS at .41 so the computer has correct input. It's output is only as good as it's input.
So I would be wrong to set it to factory specs ( .41 @ 550 rpm ) and then increase the idle ( to what's best for my car/ about 750 rpm )and let the TPS voltage be whatever it may be at that rpm?

Last edited by DoubleV; 06-30-2009 at 03:28 AM.
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Old 06-30-2009, 04:28 PM   #4
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Someone smarter than me about the programming may correct me, but I believe it will simply "learn" that's what the idle TPS voltage is and go from there.
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Old 06-30-2009, 07:43 PM   #5
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Re: TPS voltage vs. Idle speed

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Originally Posted by DoubleV View Post
Yes, but I think I could do better. I did a 'quicky' job because I didn't have the time. I used a friends laptop that displayed all the info. The reading were jumping around alot ( lazy O2 sensor??? ) so I wasn't able to be as precise as I wanted to be.
So I would be wrong to set it to factory specs ( .41 @ 550 rpm ) and then increase the idle ( to what's best for my car/ about 750 rpm )and let the TPS voltage be whatever it may be at that rpm?
If you are running headers and a single wire O2 sensor you will have that exact problem because sitting idle it cannot keep the O2 sensor hot enough and it's going in and out of closed/open loop. Installing a heated O2 sensor fixed this problem for me. I found a way to trick it with a single wire O2 was every 30 seconds or so while tuning with dwell have your helper rev up to the top of the stall limiter and hold it, or drop it in N/P and hold, until the dwell starts again and proceed with tuning in drive. You really should switch to a heated sensor though if you haven't already.

Five7kid that is one of the things that interest me in these carbs is they are 20+ years old and theres still some "wonder" or "gray area" that no one is certain about. One thing i do know though is you put garbage in and it gives it right back to you.

As far as i know the system doesn't use TPS to determine RPM, so setting it per RPM isn't needed. It just wants to know where you got the peddle at so it can control mixture and TCC.
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Old 07-01-2009, 01:42 AM   #6
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Re: TPS voltage vs. Idle speed

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As far as i know the system doesn't use TPS to determine RPM, so setting it per RPM isn't needed. It just wants to know where you got the peddle at so it can control mixture and TCC.
Perhaps I will set the voltage to the high end of the factory setting ( .51 in my case ).

I just bought a new Delco replacement O2 sensor, so looks like I'll be stuck with an unheated one for a while. I'm not running headers at least so it's not too bad.
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1997, camaro, customer, drops, factory, forum, high, higher, idle, ratings, set, spec, speed, tps, voltage
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