LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Tune question

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Old Dec 20, 2007 | 06:15 AM
  #16  
KEN96Z's Avatar
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...And if my speedo has been corrected can that only have through a PCM tune? I'm trying to find out really if I need to get a tune for the PCM to see if I can get a little more hp/tq out of the z. I'm just wondering that if there isn't a custom tune done and I wanted to get one done how would they be able to tune the PCM if I don't even know the specs on my cam or even the brand, I know or have figured out the specs for all the other mods.
Old Dec 20, 2007 | 06:26 AM
  #17  
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Originally Posted by KEN96Z
well I tried cruising at 70 in 3rd but my rpm's were at 4700. So now I'm not sure if I even have the 4.10's or they may be 4.11?
Originally Posted by '94 Bad A Z28
With a T56 you use 4th gear.

4.10 = 4100rpm
3.90 = 3900rpm
3.73 = 3730rpm
3.42 = 3420rpm
You may do it that way and I might do it that way, but the original poster said he drove in 3rd gear.... so I gave him the numbers for 3rd gear.

Last edited by Injuneer; Dec 20, 2007 at 06:30 AM.
Old Dec 20, 2007 | 06:29 AM
  #18  
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Originally Posted by KEN96Z
...And if my speedo has been corrected can that only have through a PCM tune? ....
There are "speedo correction modules" that used to be available, to insert in the wiring for the VSS, or you could use something like the Dakota Digital speedo interface:

http://www.dakotadigital.com/index.c...rod/prd126.htm
Old Dec 20, 2007 | 01:39 PM
  #19  
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Wow, I didn't even realize that he had a T56, my bad. My mistake, lol.


Redo your 70mph run, but in 4th gear, again my bad.
Old Dec 20, 2007 | 04:22 PM
  #20  
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Ok going out for a little drive and will check the rpm's at 70 in 4th. Thanks guys.
Old Dec 20, 2007 | 07:37 PM
  #21  
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Ok at 70mph in 4th rpms are 4500-4600
Old Dec 21, 2007 | 01:15 AM
  #22  
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You should really do the other thing that I said to do.
Old Dec 21, 2007 | 01:16 AM
  #23  
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'Cause all that 4th gear thing tells you is that you have 4.50something gears IF EVERYTHING in the tune is correct.
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