ARH mid-length headers with tune
Burning Brakes
Joined: Dec 2015
Posts: 812
Likes: 192
Imagine if the factory could just put those in to start with
Burning Brakes
Joined: Dec 2015
Posts: 812
Likes: 192
Not averse to headers, my main reason for doing this was to go with something initially that would not require a tune but thenI said what the hell, I will do all this so there would be more info on the numbers before,after, and after with tune so others can see. And this way I stills aved some money by going mids and not longs so if the numbers add up, which it looks like they are, it will be close to LTHs anyway. Im probably looking at 430 hp and 440 tq to the wheels with this option. From 382/383.
Thread Starter
Melting Slicks
Joined: Aug 2010
Posts: 3,063
Likes: 82
From: Tumwater, WA
No kidding some cars come with them like that. The headers should be standard.
Last edited by S'vette; Aug 9, 2016 at 08:21 PM.
Thread Starter
Melting Slicks
Joined: Aug 2010
Posts: 3,063
Likes: 82
From: Tumwater, WA
Got the car back today and its way more powerful, still havent done any hard long runs but I can feel that extra 55+ tq in there. Startup sounds pretty much the same but when you get on the gas it is louder, even if only half throttle. Full throttle and it is really loud. Cruising with valves closed, just like stock. Also I think the numbers are very close to what LTHs would net for hundreds less. So when just driving normal cant really tell but when you get on it you can tell something has been done.
Hope this helps some who were curious about the mod with and without tunes.
Hope this helps some who were curious about the mod with and without tunes.
Melting Slicks
Joined: Sep 2009
Posts: 2,180
Likes: 233
From: Minnetrista Minnesota
55+ Tq, you are going to have a hard time convincing me. The factory manifolds are pretty good. Most of us with LT's and a good tune are seeing 40 ish. My guess is 25 +- is optimistic. I do love the sound and that is worth the price of admission for me. Enjoy,
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Thread Starter
Melting Slicks
Joined: Aug 2010
Posts: 3,063
Likes: 82
From: Tumwater, WA
Im sure each car reacts a little different but I have heard that these gains were obtainable from other shop owners, even here on this forum. The shop I had it doner does all high end cars and some exotic too and I told him I didnt want any fluff numbers so I dont think he did that. Mids are going to give more tq than LTs by design I guess which is one of the reasons I went that way, I wanted low and mid range gains over top end gains. The sound is definately better and the way they should come IMO.
Thread Starter
Melting Slicks
Joined: Aug 2010
Posts: 3,063
Likes: 82
From: Tumwater, WA
You are in EP? If so then you can probably add to the validity of the shop here then for those who might think its not legit.
Racer
Joined: Jan 2015
Posts: 388
Likes: 41
C7 of Year Finalist (performance mods) 2019
I have the ARH mids on my 2015 z51 M7. Also installed a Hallteck carbon cai, Borla catless x-pipe and B&B bullets. The car is louder especially at wot, but not overly so. I had a tune done when the cel kept coming on. The dyno showed 430 hp at the wheels. Using a 20% loss factor from the engine to the wheels and working backwards, the engine is around 515 hp. This would make sense since the stock C7 hp rating is 460 and the dyno shows around 380's at the wheels, a 20% power loss. Enjoy your mods.
Burning Brakes
Joined: Dec 2015
Posts: 1,096
Likes: 322
From: Denver Colorado
^ Its been posted before that manual C7s have about a 13% drive train loss while autos have about a 17% loss.
As for altitude losses, yeah they suck. Even for forced induction applications.
Here, I had mine tuned and dynoed at about 6000 foot altitude, with hot temps bringing the DA up to around 9000 feet.
SAE corrected? 669rwhp/603tq. Uncorrected? 515/465. I'd love to actually drive my car at sea level.
As for altitude losses, yeah they suck. Even for forced induction applications.
Here, I had mine tuned and dynoed at about 6000 foot altitude, with hot temps bringing the DA up to around 9000 feet.
SAE corrected? 669rwhp/603tq. Uncorrected? 515/465. I'd love to actually drive my car at sea level.
Pro
Joined: Jan 2013
Posts: 567
Likes: 28
From: Arizona
A tune alone on a stock C7 will add 20ish, so LTs plus a CAI are really adding about 20-30.
Burning Brakes
Joined: Aug 2015
Posts: 841
Likes: 53
From: LaGrange KY
Curious about the CEL. Do you know what it was throwing? After my first track day, last week I've been getting a CEL. I have the mids, catted with corsa X and Corsa sports. CEL i get is P2099. I think I might have a bad o2, but it could just be the high flow cats!
Team Owner
Joined: May 1999
Posts: 34,551
Likes: 505
From: Auburn Hills MI
Where is the bottleneck then?
Not in the X pipe? Is the Z06 X pipe the same diameter/flow of the stock Stingray?
I want headers because I want to push another 50rwhp or so out of my setup(ECS/Meth) but I do not want the noise.
I was considering mid lengths but not sure they will get me there.
Not in the X pipe? Is the Z06 X pipe the same diameter/flow of the stock Stingray?
I want headers because I want to push another 50rwhp or so out of my setup(ECS/Meth) but I do not want the noise.
I was considering mid lengths but not sure they will get me there.
Last edited by NoOne; Aug 17, 2016 at 07:49 AM.
Racer
Joined: Jan 2015
Posts: 388
Likes: 41
C7 of Year Finalist (performance mods) 2019
Not sure, but I think it was 2098 and 2099. You can check the codes on the internet. The computer indicated the O2 sensors were ok, but both banks were running lean. The tune eliminated the skip shift at 1-4 and also the 4 cylinder mode. Everything was fine until I installed the catless Borla. Now the car is running much smoother, less drone from the Bullets, actually no drone, and power seems more seamless between shifts. I'm quite pleased with the results ... and no cel.
Thread Starter
Melting Slicks
Joined: Aug 2010
Posts: 3,063
Likes: 82
From: Tumwater, WA
I'm liking the extra TQ with the mids and tune, its makes the car more fun to drive. The extra sound really only comes into play when getting on the gas but the idle sound does have a bit of a lobe in now making it sound much better than stock.
I did this so others can have some more info on these headers with and without tunes. I know I was curious and couldnt find any real info on these headers with tunes so it made me do it.
I did this so others can have some more info on these headers with and without tunes. I know I was curious and couldnt find any real info on these headers with tunes so it made me do it.
Last edited by S'vette; Aug 17, 2016 at 09:09 PM.
