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Camaro V6 LLT Engine, Exhaust, and Bolt-Ons Bolt-Ons | Intakes | Exhaust

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Old 04-23-2010, 06:38 PM   #1
John VS
 
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Doug Thorley Shorty Headers - Dyno is In!

Here's the graph:



This actually shows a small drop in HP, but it looks to me as if for some reason the second run ended earlier than the first one, causing the HP peak to be cut off.

The good news is that there is some significant gains in both HP and torque across the rpm range. At 4300 rpm, the headers gave a 13HP increase and about 16.5 torque. The torque gains are even greater lower down. At 3K rpm it looks like the torque numbers went from 185 to 215, for a gain of 30.

The overall before numbers seem in the right range to me, based on other dyno sheets I've seen for the automatic. This was run on a Dynojet, as you can see at the top of the graph.

Also, for those wondering, my car has a full 2.5 inch DT Catback system which was constant for both runs. I have no other mods besides changing the oil (Mobil 1) and the diff. fluid (Amsoil Severe Gear).

If anyone is interested in these, there will be a run of them. Not sure how big it will be at this moment. You can contact Nick @ Doug Thorley 951-733-1744 and put yourself on the list.

I'm picking up the car in the AM. I'll report on the butt dyno feel and sound tomorrow. Maybe even some video if I get back from the Costa Mesa meet early enough.

Update: I've added a link to a new video below.
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Last edited by John VS; 04-24-2010 at 09:57 PM.
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Old 04-23-2010, 06:44 PM   #2
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Nice very nice!
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Old 04-23-2010, 06:48 PM   #3
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very nice numbers. will be interesting to see if you get a CEL. Still on the fence about shorties. will be following this closely.
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Old 04-23-2010, 06:49 PM   #4
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Yeah, the more I look at it, the more eager I am to go get my car. Can there really be a 100 jump in torque at 2400 RPM? I'm thinking that will be pretty easy to feel.

Quote:
will be interesting to see if you get a CEL.
Interesting isn't the word I'd use, but I see what you're saying. I'm hopeful that the weld-on nature of the part will prevent any leaks that seem to be the cause of the CELs some were getting with the JBAs.
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Old 04-23-2010, 06:55 PM   #5
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cool stuff...

however... your baseline does seem to be a bit off... especially the low end torque... You mention 185 at 3000 RPM... Here is my 100% stock dyno:



Yes, I know dyno are different, blah, blah, blah... but at 3000 RPM my stock car was well over 200 ft/lbs at 3000 RPM... by 4300 RPM i'm pretty close to peaking which was at 222 ft/lbs...

Again... cool stuff! How's the new sound?
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Old 04-23-2010, 07:00 PM   #6
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Quote:
Originally Posted by John VS View Post
Here's the graph:



This actually shows a small drop in HP, but it looks to me as if for some reason the second run ended earlier than the first one, causing the HP peak to be cut off.

The good news is that there is some significant gains in both HP and torque across the rpm range. At 4300 rpm, the headers gave a 13HP increase and about 16.5 torque. The torque gains are even greater lower down. At 3K rpm it looks like the torque numbers went from 185 to 215, for a gain of 30.

The overall before numbers seem in the right range to me, based on other dyno sheets I've seen for the automatic. This was run on a Dynojet, as you can see at the top of the graph.

Also, for those wondering, my car has a full 2.5 inch DT Catback system which was constant for both runs. I have no other mods besides changing the oil (Mobil 1) and the diff. fluid (Amsoil Severe Gear).

If anyone is interested in these, there will be a run of them. Not sure how big it will be at this moment. You can contact Nick @ Doug Thorley 951-733-1744 and put yourself on the list.

I'm picking up the car in the AM. I'll report on the butt dyno feel and sound tomorrow. Maybe even some video if I get back from the Costa Mesa meet early enough.
The New V6 Camaro is a 3.6L.

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Old 04-23-2010, 07:10 PM   #7
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Quote:
How's the new sound?
Will let you know when I pick it up tomorrow morning. Unfortunately my wife is out of town until late tonight, so I'm stuck.

I agree with you about the dyno. Seems like the torque numbers on the stock run are lower than normal. Not sure why.
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Old 04-23-2010, 07:41 PM   #8
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scrming, just curious what gains did you see with your shorty headers?
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Old 04-23-2010, 07:47 PM   #9
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scrming, just curious what gains did you see with your shorty headers?
Not much... Mrray13 showed about 5 rwhp... I seen a small improvement in my 0-60....
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Old 04-23-2010, 07:48 PM   #10
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Not much... Mrray13 showed about 5 rwhp... I seen a small improvement in my 0-60....
Even with the Trifecta tune you didn't see much? I mean 5rwhp isn't that bad, but anything below that..
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Old 04-23-2010, 07:55 PM   #11
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Even with the Trifecta tune you didn't see much? I mean 5rwhp isn't that bad, but anything below that..
Yep.... But it sounds so good!!!!! in fact I am sitting on my front porch randomly remote starting my car so I can listen to it!!! (digging this iPad thing.. Lol)
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Old 04-23-2010, 09:12 PM   #12
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The New V6 Camaro is a 3.6L
Yes it is.

I don't think it affected the run.
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Old 04-23-2010, 09:15 PM   #13
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Wow, nice. Those look like fantastic gains....assuming your stock run was correct (which at the point in the RPMs that you measured the gains...it does look correct).

I think it should be noticeable forsure...will be looking forward to your report on feel and the change in sound.
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Old 04-23-2010, 10:08 PM   #14
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Yeah, I was thinking about what scriming said. He's right that the bottom of the stock run seems low. But I think even if you ignore the stock run below 3K (where it looks noticeably low) and the headers run above 6.5K (where the run seems to have ended a bit early and clipped the peak) you've still got a big chunk of the power band that shows some really nice gains. I'm just eyeballing it, but it looks like about 12HP and 20TQ on average.

Even if you were to drop in scriming's stock run in place of mine (I know you can't really do it, diff. dynos on diff. days with diff. weather, etc....but just for fun) you'd still see some gains. At 4500 RPM I see about 7-8HP and maybe 10TQ. It's more like 15HP and 17TQ gains at 5K. All that to say, I think these probably are showing some pretty nice gains over stock.
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Old 04-23-2010, 10:22 PM   #15
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I'm curious to see other dyno test with these headers.. Seems like awesome gains, if I could get more than 5hp/tq with these, then it seems like these are the shortys to get.
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Old 04-23-2010, 11:21 PM   #16
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Quote:
I'm curious to see other dyno test with these headers.
I'd love to see them too. I believe at this moment I have the only set. I could be wrong, but I think this is the first production batch.

Next month I will be getting an intake (Injen unless Vararam comes through). If I can find someone in OC who'll give me dyno time at a good price, I would love to run it again for comparison. So if there's anyone who reads this who knows a place to get a dyno done in OC, let me know.
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Old 04-24-2010, 12:17 AM   #17
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YeeHaw!!!

Nice job!

Thanks for posting your info!
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Old 04-24-2010, 12:12 PM   #18
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Quote:
Originally Posted by BaylorAirForce View Post
scrming, just curious what gains did you see with your shorty headers?
Quote:
Originally Posted by scrming View Post
Not much... Mrray13 showed about 5 rwhp... I seen a small improvement in my 0-60....

Yep ~ 5rwhp and 8lb-ft of torque.


Quote:
Originally Posted by BaylorAirForce View Post
Even with the Trifecta tune you didn't see much? I mean 5rwhp isn't that bad, but anything below that..

Never ran them with the tune, so no idea what they would have produced. I'd guess another 2-3 rwhp and 2-3lb-ft of torque.


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Originally Posted by scrming View Post
Yep.... But it sounds so good!!!!! in fact I am sitting on my front porch randomly remote starting my car so I can listen to it!!! (digging this iPad thing.. Lol)

Yes they did! Definitely a nice aggressive note!




All that said, I'm not for sure the DTs will make much more power then the JBAs did. Those numbers look really, really good though, and I hope they are accurate. Of course, like scrming hinted at, different dynos, different results, lol.
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Old 04-24-2010, 01:58 PM   #19
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All that said, I'm not for sure the DTs will make much more power then the JBAs did. Those numbers look really, really good though, and I hope they are accurate. Of course, like scrming hinted at, different dynos, different results, lol.
Stupid variables
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Old 04-24-2010, 07:36 PM   #20
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Yep.... But it sounds so good!!!!! in fact I am sitting on my front porch randomly remote starting my car so I can listen to it!!! (digging this iPad thing.. Lol)

lol Nice.. I was checking my posts on the Ipad also. Makes a lazy man lazier now. Now i don't even have to sit upright at my desk to check the internet. Now I can lay on the couch.

Now they just need Ibeer.

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Old 04-24-2010, 07:53 PM   #21
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lol Nice.. I was checking my posts on the Ipad also. Makes a lazy man lazier now. Now i don't even have to sit upright at my desk to check the internet. Now I can lay on the couch.

Now they just need Ibeer.

Got the IWife to get the beer...
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Old 04-24-2010, 08:03 PM   #22
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How much different does it sound with the shorties. and do you still have stock exhaust, or an after market. give us a vid of the sound.........
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Old 04-24-2010, 09:56 PM   #23
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Okay, I promised I'd report on the sound/power changes.

Both are noticeable improvements. The sound is dramatically different. I've put 7000 miles on the car with just the DT Catback, so I know how this car sounds. The headers really changed things. It's actually quieter at cruising speeds and the rasp I would sometimes get around 4500 rpm is basically gone. I would describe the sound as smooth.

It's not boomy or intrusive in the cabin, but it roars when you step on it. I made a little video that gives a sense of it. If anyone knows how to embed this, please do:



As for the power, there is a difference. The dyno shows about a 8-14% gain in torque. I'd say that's about what if feels like. 10% isn't overwhelming but it is noticeable. If I had a Dashawk, I suspect I'd have dropped at least a 10th of my 0-60 time.

I did do a run on the on-ramp from 0-70. Usually when I punch it, the tires chirp a bit before they catch. This time, I heard them rotate on the pavement. It sounded like pulling a single sheet of paper out of a pack and the car slid over a bit before it caught pavement.

So, the sound is fantastic (to my ears). The power increase is there. I wish I could confirm it on the track, but the nearest one is an hour away. Hopefully I'll be able to afford another dyno run after I get my intake replaced.
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Old 04-24-2010, 10:07 PM   #24
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Got the IWife to get the beer...

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Old 04-24-2010, 11:09 PM   #25
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Sounds good. Almost sounds like my LS3 does ont he inside upon acceleration. Thanks for the video......
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