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My initial thoughts on LS6 manifold install on a pretty much stock LS1 99 coupe

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Old 07-19-2018, 02:38 PM
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acuevo
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Originally Posted by pjdbm
Did you get rid of the EGR? I am looking into this.
I kept the EGR on mine.
Old 07-19-2018, 03:07 PM
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Hmm, this thread is rather illuminating. I bought my FRC in May with an LS6 intake, Hallitech CIA, long tubes, HF cats, Borla stingers and a Kurt Urban steam kit.

He did tell me he’s never had the car tuned or Dynod when we were initially discussing the existing mods.

seems like a tune may be over due. Kind of worrying about that.. what is the average price to get a car tuned by a reputable shop? (I have one called Virginia speed near me I’ve heard good things about)
Old 07-19-2018, 03:09 PM
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Originally Posted by acuevo


I kept the EGR on mine.
What EGR? C5's don't have one
Old 07-19-2018, 03:19 PM
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Originally Posted by Smoken1
What EGR? C5's don't have one
I stand corrected, no egr, I was looking ls1 intakes off camaros or whatever. I just looked at my intake and I dont have anything on top near the throttle body.
This is great news because I wouldnt do the intake if it meant altering the air pump or anything else.

Thanks Smoken1

Old 07-19-2018, 03:24 PM
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I was looking at this, off a Trans Am ...
Old 07-19-2018, 03:38 PM
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Originally Posted by pjdbm
I stand corrected, no egr, I was looking ls1 intakes off camaros or whatever. I just looked at my intake and I dont have anything on top near the throttle body.
This is great news because I wouldnt do the intake if it meant altering the air pump or anything else.

Thanks Smoken1
Why are you keeping the AIR system? Smog laws?
Old 07-19-2018, 03:47 PM
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No, not really, Im here in NY but just wanted to keep the car as stock as possible. By eliminating the air system.... there will be no advantage, correct? I will also have a SEC on if I did without tuning it out.
Old 07-19-2018, 03:50 PM
  #28  
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Originally Posted by grampi50
Since the LS6 intake flows better, does it require a retune? Seems like it would be tuned too lean for this intake...
You have to remember that GM has to account for manufacturing tolerances. The fuel injectors alone can vary by +/- 10% (or is it 10% total variance? I forget. Anyway...). So the reason the cars tend to run rich is because the computer has to compensate for the leanest injector on each side of the engine. If you have three injectors that flow the same and one that flows a little lean, then the computer has to increase the enrichment on all of the injectors on that side of the engine (the computer only has one O2 sensor per side so it has no way of knowing which injector is lean).

Anyway, the point is the computer has flexibility (within limits) built into its programming. However, it tends to err on the side of caution. The next mod you should look at is a flow matched set of injectors. If you plan on keeping the cam and heads stock for a while then just get a set of stock sized flow matched injectors. This way you won't have to get a tune and the engine will both make more horsepower AND get slightly better mileage by not having to over-richen some cylinders to compensate for a lean injector.
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Old 07-19-2018, 04:06 PM
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Originally Posted by pjdbm
No, not really, Im here in NY but just wanted to keep the car as stock as possible. By eliminating the air system.... there will be no advantage, correct? I will also have a SEC on if I did without tuning it out.
Yes you will have to tune the codes out. Have you ever had to change the spark plugs in your car yet? It is alot easier W/O all that stuff in the way
Old 07-19-2018, 04:14 PM
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Yes, plugs & wires was one of the very first things I did to the car a year ago when I got it. Just did the Vararam and thought this ls6 intake would compliment it a lot .
Old 07-19-2018, 05:53 PM
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Originally Posted by Smoken1
What EGR? C5's don't have one
I realized this about an hour after I posted lol. I got mixed up and was thinking of the purge valve.



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