Logging?

B8 S4
#61

Well, in theory, it looks like they are making a difference, correct?

#62

No… The headers do next to nothing on these cars Sky… IMO the stock cats prove to be little to no issue, and Pete and Tsivas have more than proved that IMO…

#63

I did some reading after I made my post and it looks like headers on the B8 S4 are not needed. It kinda looks like from the testing and results that a company made them hoping they would make a difference and it looks like that are not doing anything. From the pictures you can see the current headers available to the B8 S4 guys are just glorified cat less down pipes.

This exact same thing happened I’m the b6/7 S4. A China company tried to rip off the jhm headers. The jhm headers for the v8 makes a huge difference. But those headers have everything needed to actually work as a power adder. The china knock off headers couldn’t duplicate exactly what jhm did as its too hard to just copy outright. So after the china company made several failed attempts to copy the jhm headers and be able to have them fit. China kinda just made look alike headers that are noting more then glorified cat less down pipes. There is no gain with the china down pipes for the 4.2 S4.

it looks like the B8 S4 has headers and they are not using the technical aspects needed to make headers produce power.

#64

Thanks, but I’m not going to remove them…OK? I know one thing, the headers are about 20 lbs. lighter than the stock manifolds…each.

#65

I wouldn’t remove them. There might be a few points in the Rev range where you will see power in a part throttle siuation. As for pure need at wot it seems there isn’t a gain. Still if you have them they are a nice thing to have. Just like you said weight wise there is some savings and sound wise it might be different

#66

Can’t help but think these would help some? Look at the bend in the stock manifold immediately exiting the head exhaust port.

http://i.imgur.com/ss2K2sa.jpg

#67

Sky, sigh… I’m “ok” with whatever you do with your car… However, I will continue to explain the facts even if you don’t like them… A few of us have owned this car and tested quite a few things, I’d have headers but richi bought them when they came out so I decided on the hfc’s, I’m not hating on you but the fact is you and I btoh wasted our money on removing/changing the cats… I wouldn’t suggest you removing them and yes they save some weight but they don’t perform like most other cars do nor as eurotrash advertises… Post all the pics and dynos you want I’ll take the results several of us tested and shared, start accepting some facts man… People really wanted to help you and me probably more than anyone but you’re getting carried away… You can disparage me if you’d like I won’t participate but you do deserve what you’re getting… Shame to because with your time and willingness to spend money you could really be a great asset… Take care man and best of luck to you…

#68

Essentially you’re saying no gains with HFCs or headers? Has anyone tested the JHM pipes?

#69

Ron, no offense taken, they were put on nine months ago, long before I knew much about this car. The picture was posted so people know what they look like, nothing more.

#70

There’s the key lol

#71

But…but…how can you say he has no data or facts to support the headers?

Don’t you know that a guy he knows who used to drag race American muscle cars said theyd ‘probably’ make power!

#72

I would like to point out a few things that might help explain why these headers are not ideal or very beneficial.

http://audirevolution.net/addons/albums/images/130516843.jpg

I’ll talk about the difference and importance in my post below.

#73

So in green I put 123 this represents runners 123 it might not be the actual runners but it is for use in this example we will refer to the far right or front runner on both the stock and aftermarket will be runner 1 the next will be 2 and the far right or last will be 3

Then the blue R1 is on the stock manifold that represents the number 1 runner. And in blue the R1 in two sections on the aftermarket part represents runner 1. But the aftermarket blue R1 is broken down into 2 sections. I can explain more on this in a second.

Then the red R3 is showing the 3rd runner on the stock and aftermarket parts.

In orange is the expansion before the cat is shown with 6

Then in black 7D and 8 is the collection and follow section.

Please keep in mind these headers have been out for a while and have been said or shown several times to not be very beicial. This isn’t my attempt to do anything other then explain what I see.

Take a look at what we can see here. For this I want to just concentrate on runner 1 and runner 3 on both the

For this example on the stock manifold take a look at the 1st runner and then the 3rd runner on the stock manifold. You will see that the 1st runner is about twice as long (or maybe a bit more) then the 3rd runner. Now do the same thing on the aftermarket part you will see that the 1st runner is twice as long (or maybe a bit more) then the 3rd runner. So what has changed. What is different there. The aftermarket runners are all longer then the stock runners but the difference between the runners are the same. What I’m saying here is on the stock or aftermarket the 1st runner is still twice as long as the 3rd. Nothing changed they just made longer pipes. If you really look at it in the aftermarket section it almost looks like if you could pull out runner three and move it over to runner one that it would fit perfectly same bends same length up until you see the weld marks on runner 1

Then you have the area 6 this would be the expansion area where on the stock exhaust it opens up so quickly it helps the collection and speed of the exhaust. It quickly hits the restriction of the cat but the quick expansion area helps. On the aftermarket part there isn’t much of any collector or expansion area. This is supper important if you want to make power. So the aftermarket just has all the pipes quickly jamming into the one area.

Then sections 7 and 8 D. This is the same on both the stock and aftermarket parts.

In the end the aftermarket headers only seem to be longer versions of the stock manifolds. That’s what I saw from the pictures.

#74

Yeah the jhm b67 collector (merge collector? ) is quite fat to accommodate the gases. This just looks like it rolls into 2.25. Weird.

Nice catch

Here’s a JHM S5 Prototype

http://audirevolution.net/addons/albums/images/317047148.jpg

Here’s a wrapped at for the B67. Bet he regretted wrapping them when before when he tried to install them

http://i1278.photobucket.com/albums/y505/pbullard13/103.jpg

#75

Incredible, interesting assessment, thanks.