C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Idle Speed

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Old Aug 24, 2016 | 11:09 AM
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Default Idle Speed

Where can I buy a chip to raise my Idle speed.I finally got my 400 running. every thing is good accept with the new cam The Idle is to low.Thanks,Steve
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Old Aug 24, 2016 | 02:49 PM
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Steve, Congrats! on the 1st start-UP. you need to specify a specific year EFI platform. for the eprom.
Example 85 = 2732A<> 86 - 89 = 27C128<> 90 - 93 = 27C256<> 94 - 95 = flash = direct programing<> 96 1st year true OBD II = direct programing. you will need a tuner! you will need a lot more than simply raising the idle<

Last edited by THE 383 admiral; Aug 24, 2016 at 02:51 PM.
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Old Aug 24, 2016 | 04:01 PM
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Thanks Admiral.Mine is an 87 so I assume Its the 86-89 27C128<>
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Old Aug 24, 2016 | 04:19 PM
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Originally Posted by steven mack
Thanks Admiral.Mine is an 87 so I assume Its the 86-89 27C128<>

that is correct. the OE is burnt via UV. the mod is DEsoldering. then installing a EEprom. you can install Atmel AT29c256 OR 512 chips. actually slightly quicker access time. this allows UNlimited burns to the EEprom. along with CATS or tunerPRO and a USB to OBD I adapter OR OBD I / II "Y" adapter. data logging is a must. capturing with something like Datamaster. and sending the results. off to a bench tune. Close. or actually doing live tunes on a DYNO. for Optimal results.

Last edited by THE 383 admiral; Aug 24, 2016 at 04:26 PM.
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Old Aug 24, 2016 | 05:16 PM
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Thanks again admiral.I'll try and hunt up all the stuff you have listed.
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