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Remote Tuning an LS3 swapped C5

Old 06-29-2018, 03:11 PM
  #21  
mikehimself
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I thought that the 2000 ECU's were the newer style (like 04). There isn't much configurability in the old style ECU's.
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Old 07-05-2018, 12:40 AM
  #22  
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Default You would be better off.....

Originally Posted by nsogiba View Post
No option for "resonant" on sensor type for a 2000 C5 file. Only "Engine" and "Cylinder".

It's definitely not burst knock because I zero'd out the table that pulls burst knock timing and still get it.

You would be better off with a later model E38 ecm, harness, and knock sensors.

I've played with too many peoples "converted" engine swaps and it never works out right.

Simply put, there is no way to properly use LS1 knock sensors and an LS1 pcm to correctly/safely

detect knock when using a later model block.

EVERYONE messes with it, but there's simply no reliable way to do it right.

I've turned down more than a few jobs like this because they waste tons of time and in my opinion

never turn out right..... Considering all the money and time you put into them.

I always use an LS1 based stroker motor and change the heads to get it working right.

This way everything works out right.

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Old 07-18-2018, 10:27 PM
  #23  
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Originally Posted by Chuck CoW View Post
You would be better off with a later model E38 ecm, harness, and knock sensors.
Definitely a horrible idea
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Old 08-06-2018, 05:59 PM
  #24  
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Chuck is exactly correct.
You will **** around with this forever and never know if its correct.
Brst bet is to turn them off and keep the tune conservative.
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Old 08-06-2018, 06:14 PM
  #25  
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Originally Posted by RonSSNova View Post
Chuck is exactly correct.
You will **** around with this forever and never know if its correct.
Brst bet is to turn them off and keep the tune conservative.
After messing with all the sensitivity tables with dozens of my own iterations I have to agree, even now I'm still getting KR here and there and have no clue why.

What is considered a "safe" timing figure under WOT for a stock headed LS3/L92 with a 228/237 cam on 93 pump gas?
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Old 08-07-2018, 11:19 PM
  #26  
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I tune my stuff. My LS1 which is just above 11:1 runs best with around 20-22 at TQ peak. Which is about 5200 in my case. Above that you can ramp it up with rpm.
A dyno will be handy. If you get it into knock, power will drop.
People say read the plugs, ok, I doubt you would see subtle knock.

I really wanted to put a 6.2 in my C5, but stroking the LS1 to 383 just makes more sense.

Last edited by RonSSNova; 08-07-2018 at 11:19 PM.
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Old 08-08-2018, 09:19 PM
  #27  
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So I should rebuild and install a stroker kit in my LS1 instead of upgrading to LS3?

Last edited by Caveboy; 08-08-2018 at 09:24 PM.
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Old 08-10-2018, 05:18 AM
  #28  
Chuck CoW
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Default You want a bigger motor, build an LS1 stroker or put LS3 heads and intake on it.....

Originally Posted by RonSSNova View Post
Chuck is exactly correct.
You will **** around with this forever and never know if its correct.
Brst bet is to turn them off and keep the tune conservative.

Thank you for lending support here.... It's SIMPLY NOT WORTH IT to mess around....

You want a bigger motor, build an LS1 stroker or put LS3 heads and intake on it....or BOTH...... VERY SIMPLE.

Installing a block that can not make use of the knock sensors EXACTLY HOW GM PROGRAMMED THEM.... IS STUPID.

Chuck CoW

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Old 08-10-2018, 05:22 AM
  #29  
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Default Trust me...... I've tried it.

Originally Posted by nsogiba View Post
After messing with all the sensitivity tables with dozens of my own iterations I have to agree, even now I'm still getting KR here and there and have no clue why.

What is considered a "safe" timing figure under WOT for a stock headed LS3/L92 with a 228/237 cam on 93 pump gas?
Trust me...... I've tried it.

If you're having problems with 6 DEG KR up top..... you have KNOCK SENSOR PROBLEMS.

I've tuned a million of these ECMS and I've seen it many times.

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Old 08-10-2018, 01:46 PM
  #30  
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Originally Posted by Chuck CoW View Post
Thank you for lending support here.... It's SIMPLY NOT WORTH IT to mess around....

You want a bigger motor, build an LS1 stroker or put LS3 heads and intake on it....or BOTH...... VERY SIMPLE.

Installing a block that can not make use of the knock sensors EXACTLY HOW GM PROGRAMMED THEM.... IS STUPID.

Chuck CoW
I don't appreciate being called stupid, especially when I'm not the only one that has ever ran a Gen 4 motor using a Gen 3 PCM (as verified by yourself in the next post). Awfully unprofessional of you given the public nature of your post

Originally Posted by Chuck CoW View Post
Trust me...... I've tried it.

If you're having problems with 6 DEG KR up top..... you have KNOCK SENSOR PROBLEMS.

I've tuned a million of these ECMS and I've seen it many times.

Chuck CoW
If you've done a million of these setups, do you have a meaningful suggestion for this application?
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Old 08-10-2018, 02:33 PM
  #31  
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Default Nobody called you stupid.....

Nobody called you stupid.....

Delete your post and I'll help you any way I can.

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Old 08-10-2018, 06:45 PM
  #32  
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Originally Posted by Chuck CoW View Post
Thank you for lending support here.... It's SIMPLY NOT WORTH IT to mess around....

You want a bigger motor, build an LS1 stroker or put LS3 heads and intake on it....or BOTH...... VERY SIMPLE.

Installing a block that can not make use of the knock sensors EXACTLY HOW GM PROGRAMMED THEM.... IS STUPID.

Chuck CoW
How is he going to use Ls3 heads on a ls1 bore?


I would run an Ls3 before a ran a ls1 based stroker. Ls1 anything is a waste of time with how cheap the 4 inch+ stuff is IMO.
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Old 08-10-2018, 06:46 PM
  #33  
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Originally Posted by RonSSNova View Post


I really wanted to put a 6.2 in my C5, but stroking the LS1 to 383 just makes more sense.
Until a cam only 08+ c6 kicks your *** lol
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Old 08-10-2018, 11:30 PM
  #34  
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Default Inexpensive.....

Originally Posted by Podium View Post
How is he going to use Ls3 heads on a ls1 bore?


I would run an Ls3 before a ran a ls1 based stroker. Ls1 anything is a waste of time with how cheap the 4 inch+ stuff is IMO.
Inexpensive..... 6.0 iron block with stroker or even 6.0 by itself.... with LS3 heads and you have a very durable motor which will behave like an LS3 without the

problems using an LS1 ecm and sensors....

Or, just a 383 LS1 block and 243 heads..... Done right, you don't have to have big dollars in it.

For those reading this, you can't put LS3 heads on a stock bore LS1 as the valves will hit the cyl sleeves and the only

other option is to re-machine to shift the head dowels but not really worth it.

Many options, but again NOT worth using an LS2 or LS3 block where the knock sensors will NEVER work right.

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Old 08-13-2018, 01:45 AM
  #35  
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Originally Posted by Chuck CoW View Post

Installing a block that can not make use of the knock sensors EXACTLY HOW GM PROGRAMMED THEM.... IS STUPID.

Chuck CoW
Technically any modification to the engine aside from OEM parts pretty much invalidates exact how GM programmed them. They are just piezoelectric microphones tuned to a certain frequency and mV or detection. They can be made to work with lots of work but your best bet is to figure out max timing via spark hook test and back it off a bit.
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Old 08-19-2018, 05:30 PM
  #36  
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Originally Posted by Podium View Post
Until a cam only 08+ c6 kicks your *** lol
My 346 holds its own just fine against NA C6 cars.

Its just tired, so I thought Id upgrade. Ive got a 28k mile LS1 block at the ready for a 4 crank.
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Old 08-22-2018, 03:30 AM
  #37  
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So if I have a 99, it is an bad idea to swap in a ls3?
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Old 09-08-2018, 07:12 PM
  #38  
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Ttt
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Old 09-12-2018, 02:16 AM
  #39  
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Originally Posted by Caveboy View Post
Ttt
It is fine just find a good tuner and don't worry about it
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Old 09-12-2018, 02:48 PM
  #40  
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Default Build a stroked LS block....

Originally Posted by Jason Zajac View Post
It is fine just find a good tuner and don't worry about it

Build a stroked LS1 or 6.0 iron block.... otherwise Knock sensors won't work. Everyone who knows better.... knows this.

The guys with non existent knock sensors...or knock sensors in the wrong location or otherwise in the wrong block/ecm configuration

are wasting time, money, and possibly much more.

Chuck CoW
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