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

Do I need a tune?

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Old Jul 8, 2010 | 06:15 PM
  #21  
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Originally Posted by rogerdoger1993
Ok... so where do I begin with this wideband thing?
what happened?
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Old Jul 8, 2010 | 06:18 PM
  #22  
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Well I drove the car with and without the FPR vacum line hooked up. And I noticed little difference between the two. So do you sugest I install a wideband o2 sensor and guage?
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Old Jul 8, 2010 | 06:27 PM
  #23  
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when you say little difference you meant there was a difference?

if you are the type to want to know stuff going on with you car, as I believe you are, otherwise you would not have played with the headers

to install a wideband you have to find a place to put the gauge and you need to have a O2 bung welded in place.


or


You can call Weav's guys:

http://www.lt1pcmtuning.com/

and pick their brains, buy a tune and call it a day.

did you try backing off on the timing as and experiement?
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Old Jul 8, 2010 | 07:31 PM
  #24  
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Originally Posted by slickfx3
when you say little difference you meant there was a difference?

if you are the type to want to know stuff going on with you car, as I believe you are, otherwise you would not have played with the headers

to install a wideband you have to find a place to put the gauge and you need to have a O2 bung welded in place.


or


You can call Weav's guys:

http://www.lt1pcmtuning.com/



and pick their brains, buy a tune and call it a day.

did you try backing off on the timing as and experiement?
How do I go about backing off the timing?
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Old Jul 8, 2010 | 07:42 PM
  #25  
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Originally Posted by slickfx3
when you say little difference you meant there was a difference?

if you are the type to want to know stuff going on with you car, as I believe you are, otherwise you would not have played with the headers

to install a wideband you have to find a place to put the gauge and you need to have a O2 bung welded in place.


or


You can call Weav's guys:

http://www.lt1pcmtuning.com/
Can't beat it! 120.00 and you're done as long as your problem is PCM related.

Another one to consider is member Mseven on here and at Guru. He's good too!
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Old Jul 8, 2010 | 08:13 PM
  #26  
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Originally Posted by rogerdoger1993
How do I go about backing off the timing?
timing light ascertain base timing, retard 2-3 degrees,

if it is ECM related

forgot to add, when you have the timing backed off, do the fuel thing again, that combo is serious rich...double whammy,

drive and report

Last edited by slickfx3; Jul 8, 2010 at 09:10 PM.
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Old Jul 8, 2010 | 08:52 PM
  #27  
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Originally Posted by slickfx3
timing light ascertain base timing, retard 2-3 degrees,

if it is ECM related
You just blew your credibility. It is an LT1.
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Old Jul 8, 2010 | 09:12 PM
  #28  
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Originally Posted by MK 82
You just blew your credibility. It is an LT1.
I do not strive to achieve credibility here, just another joe tinkerer,

on the other hand you have an A++++++ rating in the forum and in that regard I bow to you, your highness.....
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Old Jul 8, 2010 | 09:49 PM
  #29  
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Originally Posted by MK 82
You just blew your credibility. It is an LT1.
So far he has been a great help to me. I thought maybe there was some backwards way to trick the the timing and retard it. His method on the FPR worked great.
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Old Jul 8, 2010 | 09:50 PM
  #30  
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Originally Posted by slickfx3
I do not strive to achieve credibility here, just another joe tinkerer,

on the other hand you have an A++++++ rating in the forum and in that regard I bow to you, your highness.....
You are just like me man. Except I bit off more than I could chew with these damn headers.
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Old Jul 8, 2010 | 09:52 PM
  #31  
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I just got a reply from lt1pcmtuning and here is what they said.

Hi Gregory,

Yes, my tune will fix it, for two reasons. The first is because your ECM runs in speed density mode (no MAF sensor), which uses set VE tables in the tune to calculate fueling. Those tables need adjusted whenever you change something on the car that will affect airflow. The second reason is that the EGR system adds timing when it runs, and when it's not installed on the engine but it's still running in the ECM, those timing changes can cause surging/stumbling.

You have two options to address both of those issues; I can send you a single chip adjusted for your mods ($100, Postal Power Tune), or you can rent one of my tuning kits that will let me fine-tune it through email for exactly how it's running ($185 for one week, Cable Loan Power Tune; see http://www.lt1pcmtuning.com/service/#Cable for more). Either way, you will need a piggyback adapter to install the new chip, which you can buy for $35 from Moates (link given when you order from me).

Let me know if you have any more questions! Otherwise, you can start the order process anytime at http://www.lt1pcmtuning.com/service/customer.php


So slickfx3 you were right all along. Thanks for the lead. I think I am gonna get the cable and go that route.

Last edited by rogerdoger1993; Jul 8, 2010 at 09:54 PM. Reason: More information
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Old Jul 8, 2010 | 11:29 PM
  #32  
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Originally Posted by rogerdoger1993
I just got a reply from lt1pcmtuning and here is what they said.

Hi Gregory,

Yes, my tune will fix it, for two reasons. The first is because your ECM runs in speed density mode (no MAF sensor), which uses set VE tables in the tune to calculate fueling. Those tables need adjusted whenever you change something on the car that will affect airflow. The second reason is that the EGR system adds timing when it runs, and when it's not installed on the engine but it's still running in the ECM, those timing changes can cause surging/stumbling.

You have two options to address both of those issues; I can send you a single chip adjusted for your mods ($100, Postal Power Tune), or you can rent one of my tuning kits that will let me fine-tune it through email for exactly how it's running ($185 for one week, Cable Loan Power Tune; see http://www.lt1pcmtuning.com/service/#Cable for more). Either way, you will need a piggyback adapter to install the new chip, which you can buy for $35 from Moates (link given when you order from me).

Let me know if you have any more questions! Otherwise, you can start the order process anytime at http://www.lt1pcmtuning.com/service/customer.php


So slickfx3 you were right all along. Thanks for the lead. I think I am gonna get the cable and go that route.
Good, glad it was fueling and SA, not something else.

Just lucky guessing on my part, at least you narrowed it down...
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Old Jul 9, 2010 | 03:53 AM
  #33  
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Originally Posted by rogerdoger1993
I just got a reply from lt1pcmtuning and here is what they said.

Hi Gregory,

Yes, my tune will fix it, for two reasons. The first is because your ECM runs in speed density mode (no MAF sensor), which uses set VE tables in the tune to calculate fueling. Those tables need adjusted whenever you change something on the car that will affect airflow. The second reason is that the EGR system adds timing when it runs, and when it's not installed on the engine but it's still running in the ECM, those timing changes can cause surging/stumbling.

You have two options to address both of those issues; I can send you a single chip adjusted for your mods ($100, Postal Power Tune), or you can rent one of my tuning kits that will let me fine-tune it through email for exactly how it's running ($185 for one week, Cable Loan Power Tune; see http://www.lt1pcmtuning.com/service/#Cable for more). Either way, you will need a piggyback adapter to install the new chip, which you can buy for $35 from Moates (link given when you order from me).

Let me know if you have any more questions! Otherwise, you can start the order process anytime at http://www.lt1pcmtuning.com/service/customer.php


So slickfx3 you were right all along. Thanks for the lead. I think I am gonna get the cable and go that route.


Solomon is a super nice guy and will help you anyway he can.

Last edited by Weav's Vet; Jul 9, 2010 at 09:29 AM.
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Old Jul 9, 2010 | 08:55 PM
  #34  
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Originally Posted by rogerdoger1993
Ok I guess a tune I will order then. Probably going with PCMforless.


I disagree with those that disagree

A custom tune is worth every cent as an investment for power.

I have been very satisfied with the work from PCM's.
The process takes some time and if you are patient,
the results are worth waiting for.

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Old Jul 9, 2010 | 09:01 PM
  #35  
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I agree with you, It is the best way to go, if you have no other way to go, if you have alternatives,like doing it yourself or knowing a buddy that does it, then no.
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