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Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons Bolt-Ons | Intakes | Exhaust

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Old 01-05-2009, 03:15 PM   #1
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LS3 CAM AND HEADERS DYNO

A really nice package for the ls3 camaro folks.

This is what a mild cam - 224/233 5xx 6xx 116 should gain from stock.This cam has proven to be the best overall for Hp/Torque and fantastic driveability in other Ls3 powered cars.




Note - This is not the biggest cam we offer nor the most power we have ever made with an LS3 CAM AND HEADER COMBO,It just happens to be the best overall cam and header combo in my opinion.

Andy
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Old 01-05-2009, 03:35 PM   #2
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Will it pass emisions?
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Old 01-05-2009, 03:37 PM   #3
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not bad. I would like to see a graph vs RPM instead of SPEED though.
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Old 01-05-2009, 03:39 PM   #4
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A stock ls3 dynoed 397 to the rear wheels, are they that under rated from the factory? Wouldnt that roughly put it at 397 x 1.17 = 464 at the flywheel?
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Old 01-05-2009, 03:41 PM   #5
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Will it pass emisions?
Good question
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Old 01-05-2009, 03:42 PM   #6
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Wow, 66 horses from a cam and headers...not bad at all. Judging from your website that's about $600 for the cam w/ install kit and then what type of headers were used? Longtubes? Also, how much would you anticipate the headers for the Camaro's LS3 to cost?

I'm assuming your dyno was from a stock C6 vette and then again with your cam/headers added to it's LS3? was there also an X pipe and cat-back system added or just the headers?
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Old 01-05-2009, 04:23 PM   #7
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65 hp gain.

422 plus 65 = 487 crank hp

Here's the Corvette LS3 keeper upper power I have been talking about.
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Old 01-05-2009, 04:27 PM   #8
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^ I think he's talking about the stock numbers being underrated based on the stock rwhp. 397 rwhp really means closer to 460 at the crank in stock trim.
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Old 01-05-2009, 05:30 PM   #9
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Quote:
Originally Posted by dieseldave24v View Post
Will it pass emisions?


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not bad. I would like to see a graph vs RPM instead of SPEED though.
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Old 01-05-2009, 07:28 PM   #10
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Will it pass emisions?
This cam is not emmissions legal.

I would recommend the Magnacharger by Magnasun Products (once available) for increased hp and torque if your looking to build an emmissions friendly vehicle.
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Old 01-05-2009, 07:32 PM   #11
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A stock ls3 dynoed 397 to the rear wheels, are they that under rated from the factory? Wouldnt that roughly put it at 397 x 1.17 = 464 at the flywheel?

This was a Ls3 Corvette with C6 Z06 Exhaust and tune prior to cam and header install.

Most LS3 Vettes I do make over 420 rwhp and torque with headers ,Intake,Tune and stock cam.Some tuners claim HIGHER NUMBERS
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Old 01-05-2009, 07:42 PM   #12
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noob question do all states have emission laws?
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Old 01-05-2009, 07:48 PM   #13
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noob question do all states have emission laws?
Yes. There is a federal emissions law, then states decide how they are going to check it. Some "ie California" are very strict. Others just kind of go through the motions. I dont think there will ever be a set of CARB legal LT headers.

I don't agree with the rules, but they state the the factory catalytic converter(s) must remain intact and in the factory position(s). The converter are so far forward on most cars that there isn't room for long tube without breaking that rule.
The reason the rule exists is so that cold-start catalyst light-off is not delayed by the additional exhaust tubing length between the heads and converters. Also, the oxygen sensor has to be in the flow post-collector. Long tube headers require that the sensor be moved further downstream since the collector is further downstream. The further from the head ports the oxygen sensor get the more "lazy" they get since they're measuring the output from operating conditions "too old". Basically you end up with bad data and that affects emissions too.
So, YES - long tube headers absolutely fail visual inspection by definition.
Long tube headers themselves have minimal effect on actual emissions, the problem is the latency induced by the greater exhaust gas travel to the O2 sensors. Generally, they WILL pass the sniffer because there is very little affect at constant sustained throttle conditions where these test take place at on t he dyno.
Of course, legal headers must acommodate all factory emissions eguipment like EGR, A.I.R., O2 sensors, etc.
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Old 01-05-2009, 07:49 PM   #14
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kk down here in miami....never heard of it...thanks for the info/
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Old 01-06-2009, 09:54 AM   #15
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Yes. There is a federal emissions law, then states decide how they are going to check it. Some "ie California" are very strict. Others just kind of go through the motions. I dont think there will ever be a set of CARB legal LT headers.

I don't agree with the rules, but they state the the factory catalytic converter(s) must remain intact and in the factory position(s). The converter are so far forward on most cars that there isn't room for long tube without breaking that rule.
The reason the rule exists is so that cold-start catalyst light-off is not delayed by the additional exhaust tubing length between the heads and converters. Also, the oxygen sensor has to be in the flow post-collector. Long tube headers require that the sensor be moved further downstream since the collector is further downstream. The further from the head ports the oxygen sensor get the more "lazy" they get since they're measuring the output from operating conditions "too old". Basically you end up with bad data and that affects emissions too.
So, YES - long tube headers absolutely fail visual inspection by definition.
Long tube headers themselves have minimal effect on actual emissions, the problem is the latency induced by the greater exhaust gas travel to the O2 sensors. Generally, they WILL pass the sniffer because there is very little affect at constant sustained throttle conditions where these test take place at on t he dyno.
Of course, legal headers must acommodate all factory emissions eguipment like EGR, A.I.R., O2 sensors, etc.
I measured exhaust temperatures on the primaries right off the exhaust ports and compared to temperatures at the inlet to the cats', and there was a significant difference in temperatures. To my understanding, this entire post is great information (not that it needed validation from me). I imagine coatings and tube thickness will play factors in retaining heat in the header tubes and transfer them into the cats' but those babies have to be pretty hot in order to burn off combustion by-products.

Great post
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Old 01-06-2009, 03:30 PM   #16
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At this point I would like to see numbers with stock manifold vs. GMPP shorty headers vs. LT's. Before I change the manifold out.
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Old 01-06-2009, 03:53 PM   #17
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At this point I would like to see numbers with stock manifold vs. GMPP shorty headers vs. LT's. Before I change the manifold out.
For the $1000 price tag on the shorties, I think it's safe to say they're not worth it.
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Old 01-06-2009, 03:56 PM   #18
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kk down here in miami....never heard of it...thanks for the info/
That's because florida doesn't do any sort of emissions or safety checks on cars. Another reason why florida is the greatest state in the union. As long as you live in florida, you could put whatever mod you want on your car with no trouble unless your exhaust gets too loud a cop can right you a ticket. If that happens you can just pay the ticket (I want to say it's like $20) and keep on driving with the "illegal" exhaust.
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Old 01-06-2009, 04:15 PM   #19
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Why is your graph measured in speed instead of RPM though? Don't tell me you didn't measure engine speed for a dyno run!
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Old 01-06-2009, 04:36 PM   #20
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That's because florida doesn't do any sort of emissions or safety checks on cars. Another reason why florida is the greatest state in the union. As long as you live in florida, you could put whatever mod you want on your car with no trouble unless your exhaust gets too loud a cop can right you a ticket. If that happens you can just pay the ticket (I want to say it's like $20) and keep on driving with the "illegal" exhaust.
<3 Florida
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Old 01-06-2009, 05:45 PM   #21
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Not to go to far of topic, but I do have to say that think Florida is the best state in the union. Especially on working on your car as mentioned. We used to have the drive up smog sniffer once a year. They took that away years ago. I haven't lived there in 6 years, but all my vehicles are still registered there just for this reason.
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Old 01-06-2009, 07:41 PM   #22
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Why is your graph measured in speed instead of RPM though? Don't tell me you didn't measure engine speed for a dyno run!

On a Dynojet 248c(and many others) you can print or show many methods of power versus speed,tiime,rpm etc.Just happened to be the way it was printed at the time.

If need be I can print it with rpm,same difference though.
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Old 01-06-2009, 07:43 PM   #23
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a cop can rightyou a ticket.
Wow... what an idiot.
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Old 01-06-2009, 08:23 PM   #24
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Wow... what an idiot.
You oughta kick his arse!
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Old 01-06-2009, 09:59 PM   #25
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That's because florida doesn't do any sort of emissions or safety checks on cars. Another reason why florida is the greatest state in the union. As long as you live in florida, you could put whatever mod you want on your car with no trouble unless your exhaust gets too loud a cop can right you a ticket. If that happens you can just pay the ticket (I want to say it's like $20) and keep on driving with the "illegal" exhaust.
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<3 Florida
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Not to go to far of topic, but I do have to say that think Florida is the best state in the union. Especially on working on your car as mentioned. We used to have the drive up smog sniffer once a year. They took that away years ago. I haven't lived there in 6 years, but all my vehicles are still registered there just for this reason.


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Wow... what an idiot.
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You oughta kick his arse!
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